diff --git a/Package.swift b/Package.swift
index 9e19ff2..71e126b 100644
--- a/Package.swift
+++ b/Package.swift
@@ -70,9 +70,6 @@ traits.insert(
 
 let package = Package(
     name: "swift-configuration",
-    platforms: [
-        .macOS(.v15), .iOS(.v18), .macCatalyst(.v18), .tvOS(.v18), .watchOS(.v11), .visionOS(.v2),
-    ],
     products: [
         .library(name: "Configuration", targets: ["Configuration"]),
         .library(name: "ConfigurationTesting", targets: ["ConfigurationTesting"]),
@@ -170,21 +167,21 @@ let package = Package(
 )
 
 for target in package.targets {
-    if target.type != .plugin {
-        var settings = target.swiftSettings ?? []
+    var settings = target.swiftSettings ?? []
+
+    // https://github.com/apple/swift-evolution/blob/main/proposals/0335-existential-any.md
+    // Require `any` for existential types.
+    settings.append(.enableUpcomingFeature("ExistentialAny"))
 
-        // https://github.com/apple/swift-evolution/blob/main/proposals/0335-existential-any.md
-        // Require `any` for existential types.
-        settings.append(.enableUpcomingFeature("ExistentialAny"))
+    // https://github.com/swiftlang/swift-evolution/blob/main/proposals/0444-member-import-visibility.md
+    settings.append(.enableUpcomingFeature("MemberImportVisibility"))
 
-        // https://github.com/swiftlang/swift-evolution/blob/main/proposals/0444-member-import-visibility.md
-        settings.append(.enableUpcomingFeature("MemberImportVisibility"))
+    // https://github.com/swiftlang/swift-evolution/blob/main/proposals/0409-access-level-on-imports.md
+    settings.append(.enableUpcomingFeature("InternalImportsByDefault"))
 
-        // https://github.com/swiftlang/swift-evolution/blob/main/proposals/0409-access-level-on-imports.md
-        settings.append(.enableUpcomingFeature("InternalImportsByDefault"))
+    settings.append(.enableExperimentalFeature("AvailabilityMacro=Configuration 1.0:macOS 15.0, iOS 18.0, watchOS 11.0, tvOS 18.0, visionOS 2.0"))
 
-        target.swiftSettings = settings
-    }
+    target.swiftSettings = settings
 }
 
 if addDoccPlugin {
diff --git a/Sources/Configuration/AccessReporter.swift b/Sources/Configuration/AccessReporter.swift
index e02f951..2e8f52c 100644
--- a/Sources/Configuration/AccessReporter.swift
+++ b/Sources/Configuration/AccessReporter.swift
@@ -24,6 +24,7 @@ import Synchronization
 /// Access reporters track when configuration values are read, fetched, or watched,
 /// to provide visibility into configuration usage patterns. This is useful for
 /// debugging, auditing, and understanding configuration dependencies.
+@available(Configuration 1.0, *)
 public protocol AccessReporter: Sendable {
 
     /// Processes a configuration access event.
@@ -41,6 +42,7 @@ public protocol AccessReporter: Sendable {
 /// Access events are generated whenever configuration values are accessed through
 /// ``ConfigReader`` and ``ConfigSnapshotReader`` methods. They contain metadata about
 /// the access, results from individual providers, and the final outcome of the operation.
+@available(Configuration 1.0, *)
 public struct AccessEvent: Sendable {
 
     /// Metadata describing the configuration access operation.
@@ -184,6 +186,7 @@ public struct AccessEvent: Sendable {
 /// Use this reporter to send configuration access events to multiple destinations
 /// simultaneously. Each upstream reporter receives a copy of every event in the
 /// order they were provided during initialization.
+@available(Configuration 1.0, *)
 public struct BroadcastingAccessReporter: Sendable {
 
     /// The reporters that receive forwarded events.
@@ -198,6 +201,7 @@ public struct BroadcastingAccessReporter: Sendable {
     }
 }
 
+@available(Configuration 1.0, *)
 extension BroadcastingAccessReporter: AccessReporter {
     // swift-format-ignore: AllPublicDeclarationsHaveDocumentation
     public func report(_ event: AccessEvent) {
diff --git a/Sources/Configuration/AccessReporters/AccessLogger.swift b/Sources/Configuration/AccessReporters/AccessLogger.swift
index 775f0c0..134c971 100644
--- a/Sources/Configuration/AccessReporters/AccessLogger.swift
+++ b/Sources/Configuration/AccessReporters/AccessLogger.swift
@@ -53,6 +53,7 @@ import Synchronization
 /// - `value`: The resolved configuration value (redacted for secrets)
 /// - `counter`: An incrementing counter for tracking access frequency
 /// - Provider-specific information for each provider in the hierarchy
+@available(Configuration 1.0, *)
 public final class AccessLogger: Sendable {
 
     /// The logger used to emit configuration access events.
@@ -94,6 +95,7 @@ public final class AccessLogger: Sendable {
     }
 }
 
+@available(Configuration 1.0, *)
 extension AccessLogger: AccessReporter {
     // swift-format-ignore: AllPublicDeclarationsHaveDocumentation
     public func report(_ event: AccessEvent) {
@@ -109,6 +111,7 @@ extension AccessLogger: AccessReporter {
     }
 }
 
+@available(Configuration 1.0, *)
 extension AccessEvent.Metadata {
     /// Add log metadata.
     /// - Parameter metadata: The metadata to which to add values.
@@ -119,6 +122,7 @@ extension AccessEvent.Metadata {
     }
 }
 
+@available(Configuration 1.0, *)
 extension AccessEvent.ProviderResult {
     /// Add log metadata.
     /// - Parameters:
@@ -136,6 +140,7 @@ extension AccessEvent.ProviderResult {
     }
 }
 
+@available(Configuration 1.0, *)
 extension AccessEvent {
     /// Add log metadata.
     /// - Parameter metadata: The metadata to which to add values.
@@ -151,6 +156,7 @@ extension AccessEvent {
     }
 }
 
+@available(Configuration 1.0, *)
 extension Result<ConfigValue?, any Error> {
     /// Add log metadata.
     /// - Parameter metadata: The metadata to which to add values.
diff --git a/Sources/Configuration/AccessReporters/FileAccessLogger.swift b/Sources/Configuration/AccessReporters/FileAccessLogger.swift
index df97530..663369a 100644
--- a/Sources/Configuration/AccessReporters/FileAccessLogger.swift
+++ b/Sources/Configuration/AccessReporters/FileAccessLogger.swift
@@ -64,6 +64,7 @@ import Synchronization
 /// - Resolved value (redacted for secrets)
 /// - Provider that supplied the value or error information
 /// - Access metadata (operation type, value type, source location, timestamp)
+@available(Configuration 1.0, *)
 public final class FileAccessLogger: Sendable {
 
     /// The file descriptor used for writing access events to the log file.
@@ -199,6 +200,7 @@ public final class FileAccessLogger: Sendable {
     }
 }
 
+@available(Configuration 1.0, *)
 extension FileAccessLogger: AccessReporter {
     // swift-format-ignore: AllPublicDeclarationsHaveDocumentation
     public func report(_ event: AccessEvent) {
@@ -213,6 +215,7 @@ extension FileAccessLogger: AccessReporter {
     }
 }
 
+@available(Configuration 1.0, *)
 extension FileAccessLogger {
     /// Renders a string summary for the event.
     /// - Parameter event: The event to render.
@@ -222,6 +225,7 @@ extension FileAccessLogger {
     }
 }
 
+@available(Configuration 1.0, *)
 extension AccessEvent {
     /// Returns a human-readable single line string summarizing the access event.
     /// - Parameter dateFormatStyle: The format style used for rendering dates.
@@ -280,6 +284,7 @@ extension AccessEvent {
     }
 }
 
+@available(Configuration 1.0, *)
 extension ConfigContent {
     /// Returns a string representation of the config value, formatting complex types appropriately.
     ///
diff --git a/Sources/Configuration/ConfigProvider.swift b/Sources/Configuration/ConfigProvider.swift
index 32d535d..ae2d23f 100644
--- a/Sources/Configuration/ConfigProvider.swift
+++ b/Sources/Configuration/ConfigProvider.swift
@@ -45,6 +45,7 @@
 ///
 /// **Dynamic providers**: Implement `watch` methods to emit real-time updates from
 /// polling, file system monitoring, or other change detection mechanisms.
+@available(Configuration 1.0, *)
 public protocol ConfigProvider: Sendable {
 
     /// The human-readable name of the configuration provider.
@@ -137,6 +138,7 @@ public protocol ConfigProvider: Sendable {
 /// Snapshots enable consistent reads of multiple related configuration keys by
 /// capturing the provider's state at a specific moment. This prevents the underlying
 /// data from changing between individual key lookups.
+@available(Configuration 1.0, *)
 public protocol ConfigSnapshotProtocol: Sendable {
 
     /// The human-readable name of the configuration provider that created this snapshot.
@@ -159,6 +161,7 @@ public protocol ConfigSnapshotProtocol: Sendable {
 }
 
 /// The result of looking up a configuration value in a provider.
+@available(Configuration 1.0, *)
 public struct LookupResult: Sendable, Equatable, Hashable {
 
     /// The provider-specific encoding of the configuration key.
@@ -181,6 +184,7 @@ public struct LookupResult: Sendable, Equatable, Hashable {
 }
 
 /// The supported configuration value types.
+@available(Configuration 1.0, *)
 @frozen public enum ConfigType: String, Sendable, Equatable, Hashable {
 
     /// A string value.
@@ -215,6 +219,7 @@ public struct LookupResult: Sendable, Equatable, Hashable {
 }
 
 /// The raw content of a configuration value.
+@available(Configuration 1.0, *)
 @frozen public enum ConfigContent: Sendable, Equatable, Hashable {
 
     /// A string value.
@@ -433,6 +438,7 @@ public struct LookupResult: Sendable, Equatable, Hashable {
 /// Configuration values include the actual content and a flag indicating whether
 /// the value contains sensitive information. Secret values are protected from
 /// accidental disclosure in logs and debug output.
+@available(Configuration 1.0, *)
 public struct ConfigValue: Sendable, Equatable, Hashable {
 
     /// The configuration content.
@@ -451,6 +457,7 @@ public struct ConfigValue: Sendable, Equatable, Hashable {
     }
 }
 
+@available(Configuration 1.0, *)
 extension ConfigValue: CustomStringConvertible {
     // swift-format-ignore: AllPublicDeclarationsHaveDocumentation
     public var description: String {
@@ -462,6 +469,7 @@ extension ConfigValue: CustomStringConvertible {
     }
 }
 
+@available(Configuration 1.0, *)
 extension ConfigValue: ExpressibleByStringLiteral {
     // swift-format-ignore: AllPublicDeclarationsHaveDocumentation
     public init(stringLiteral value: String) {
@@ -469,6 +477,7 @@ extension ConfigValue: ExpressibleByStringLiteral {
     }
 }
 
+@available(Configuration 1.0, *)
 extension ConfigContent: ExpressibleByStringLiteral {
     // swift-format-ignore: AllPublicDeclarationsHaveDocumentation
     public init(stringLiteral value: String) {
@@ -476,6 +485,7 @@ extension ConfigContent: ExpressibleByStringLiteral {
     }
 }
 
+@available(Configuration 1.0, *)
 extension ConfigValue: ExpressibleByIntegerLiteral {
     // swift-format-ignore: AllPublicDeclarationsHaveDocumentation
     public init(integerLiteral value: Int) {
@@ -483,6 +493,7 @@ extension ConfigValue: ExpressibleByIntegerLiteral {
     }
 }
 
+@available(Configuration 1.0, *)
 extension ConfigContent: ExpressibleByIntegerLiteral {
     // swift-format-ignore: AllPublicDeclarationsHaveDocumentation
     public init(integerLiteral value: Int) {
@@ -490,6 +501,7 @@ extension ConfigContent: ExpressibleByIntegerLiteral {
     }
 }
 
+@available(Configuration 1.0, *)
 extension ConfigValue: ExpressibleByFloatLiteral {
     // swift-format-ignore: AllPublicDeclarationsHaveDocumentation
     public init(floatLiteral value: Double) {
@@ -497,6 +509,7 @@ extension ConfigValue: ExpressibleByFloatLiteral {
     }
 }
 
+@available(Configuration 1.0, *)
 extension ConfigContent: ExpressibleByFloatLiteral {
     // swift-format-ignore: AllPublicDeclarationsHaveDocumentation
     public init(floatLiteral value: Double) {
@@ -504,6 +517,7 @@ extension ConfigContent: ExpressibleByFloatLiteral {
     }
 }
 
+@available(Configuration 1.0, *)
 extension ConfigValue: ExpressibleByBooleanLiteral {
     // swift-format-ignore: AllPublicDeclarationsHaveDocumentation
     public init(booleanLiteral value: Bool) {
@@ -511,6 +525,7 @@ extension ConfigValue: ExpressibleByBooleanLiteral {
     }
 }
 
+@available(Configuration 1.0, *)
 extension ConfigContent: ExpressibleByBooleanLiteral {
     // swift-format-ignore: AllPublicDeclarationsHaveDocumentation
     public init(booleanLiteral value: Bool) {
diff --git a/Sources/Configuration/ConfigProviderHelpers.swift b/Sources/Configuration/ConfigProviderHelpers.swift
index eff1f01..3dbef54 100644
--- a/Sources/Configuration/ConfigProviderHelpers.swift
+++ b/Sources/Configuration/ConfigProviderHelpers.swift
@@ -12,6 +12,7 @@
 //
 //===----------------------------------------------------------------------===//
 
+@available(Configuration 1.0, *)
 extension ConfigProvider {
 
     /// Implements `watchValue` by getting the current value and emitting it immediately.
@@ -116,6 +117,7 @@ extension ConfigProvider {
 ///   - work: A closure that performs the value lookup and returns the result.
 /// - Returns: A lookup result containing the encoded key and the value from the closure.
 /// - Throws: Rethrows any errors thrown by the provided closure.
+@available(Configuration 1.0, *)
 package func withConfigValueLookup<Failure: Error>(
     encodedKey: String,
     work: () throws(Failure) -> ConfigValue?
@@ -147,6 +149,7 @@ package func withConfigValueLookup<Failure: Error>(
 ///   - work: An async closure that performs the value lookup and returns the result.
 /// - Returns: A lookup result containing the encoded key and the value from the closure.
 /// - Throws: Rethrows any errors thrown by the provided closure.
+@available(Configuration 1.0, *)
 package func withConfigValueLookup<Failure: Error>(
     encodedKey: String,
     work: () async throws(Failure) -> ConfigValue?
diff --git a/Sources/Configuration/ConfigReader+internalHelpers.swift b/Sources/Configuration/ConfigReader+internalHelpers.swift
index 73eb282..2ff226e 100644
--- a/Sources/Configuration/ConfigReader+internalHelpers.swift
+++ b/Sources/Configuration/ConfigReader+internalHelpers.swift
@@ -18,6 +18,7 @@ import FoundationEssentials
 import Foundation
 #endif
 
+@available(Configuration 1.0, *)
 extension ConfigValue {
     /// Returns a copy of the config value marked as secret.
     ///
@@ -29,6 +30,7 @@ extension ConfigValue {
     }
 }
 
+@available(Configuration 1.0, *)
 extension Result<ConfigValue?, any Error> {
     /// Returns a copy of the result with the value marked as secret.
     ///
@@ -38,6 +40,7 @@ extension Result<ConfigValue?, any Error> {
     }
 }
 
+@available(Configuration 1.0, *)
 extension LookupResult {
     /// Returns a copy of the config value marked as secret.
     ///
@@ -49,6 +52,7 @@ extension LookupResult {
     }
 }
 
+@available(Configuration 1.0, *)
 extension Result<LookupResult, any Error> {
     /// Returns a copy of the result with the value marked as secret.
     ///
@@ -58,6 +62,7 @@ extension Result<LookupResult, any Error> {
     }
 }
 
+@available(Configuration 1.0, *)
 extension AccessEvent.ProviderResult {
     /// Returns a copy of the result marked as secret.
     ///
@@ -80,6 +85,7 @@ extension AccessEvent.ProviderResult {
 ///   - isSecret: Whether to mark the values as secret.
 ///   - tuple: A tuple containing provider results and a configuration value result.
 /// - Returns: The tuple with values marked as secret if the flag is true, otherwise unchanged.
+@available(Configuration 1.0, *)
 private func mergingIsSecret(
     _ isSecret: Bool,
     _ tuple: ([AccessEvent.ProviderResult], Result<ConfigValue?, any Error>)
@@ -121,6 +127,7 @@ private func mergingIsSecret(
 ///   - fileID: Source file identifier for access event metadata.
 ///   - line: Source line number for access event metadata.
 /// - Returns: The converted configuration value, or `nil` if not found or conversion fails.
+@available(Configuration 1.0, *)
 internal func valueFromReader<Value>(
     forKey key: ConfigKey,
     type: ConfigType,
@@ -193,6 +200,7 @@ internal func valueFromReader<Value>(
 ///   - fileID: Source file identifier used for event reporting.
 ///   - line: Source line number used for event reporting.
 /// - Returns: The configuration value converted to the requested type.
+@available(Configuration 1.0, *)
 internal func valueFromReader<Value>(
     forKey key: ConfigKey,
     type: ConfigType,
@@ -269,6 +277,7 @@ internal func valueFromReader<Value>(
 /// - Throws: `ConfigError.missingRequiredConfigValue` if the configuration value is not found, or any error thrown
 ///   by the `unwrap` closure if conversion fails.
 /// - Returns: The configuration value converted to the requested type.
+@available(Configuration 1.0, *)
 internal func requiredValueFromReader<Value>(
     forKey key: ConfigKey,
     type: ConfigType,
@@ -324,6 +333,7 @@ internal func requiredValueFromReader<Value>(
     return try finalResult.get().0
 }
 
+@available(Configuration 1.0, *)
 extension ConfigReader {
 
     /// Gets a config value synchronously.
diff --git a/Sources/Configuration/ConfigReader+methods.swift b/Sources/Configuration/ConfigReader+methods.swift
index e062762..d63d762 100644
--- a/Sources/Configuration/ConfigReader+methods.swift
+++ b/Sources/Configuration/ConfigReader+methods.swift
@@ -18,6 +18,7 @@
 // #                                                                           #
 // #############################################################################
 
+@available(Configuration 1.0, *)
 extension ConfigReader {
 
     // MARK: - Get
diff --git a/Sources/Configuration/ConfigReader+methods.swift.gyb b/Sources/Configuration/ConfigReader+methods.swift.gyb
index 8b6b03c..4204569 100644
--- a/Sources/Configuration/ConfigReader+methods.swift.gyb
+++ b/Sources/Configuration/ConfigReader+methods.swift.gyb
@@ -16,6 +16,7 @@
   from gyb_utils import *
 }%
 ${autogenerated_warning()}
+@available(Configuration 1.0, *)
 extension ConfigReader {
 
     // MARK: - Get
diff --git a/Sources/Configuration/ConfigReader.swift b/Sources/Configuration/ConfigReader.swift
index 50cb4de..fc5b41b 100644
--- a/Sources/Configuration/ConfigReader.swift
+++ b/Sources/Configuration/ConfigReader.swift
@@ -235,6 +235,7 @@ import Foundation
 ///
 /// The library reports all provider errors to the access reporter through the `providerResults` array,
 /// even when handled gracefully.
+@available(Configuration 1.0, *)
 public struct ConfigReader: Sendable {
 
     /// The key prefix prepended to all configuration lookups.
@@ -324,6 +325,7 @@ public struct ConfigReader: Sendable {
     }
 }
 
+@available(Configuration 1.0, *)
 extension ConfigReader {
 
     /// Creates a config reader with a single provider.
@@ -411,6 +413,7 @@ extension ConfigReader {
 
 // MARK: - Internal conveniences
 
+@available(Configuration 1.0, *)
 extension ConfigReader {
 
     /// The decoder the library uses to convert string keys into config keys.
@@ -434,6 +437,7 @@ extension ConfigReader {
 /// An error thrown by Configuration module types.
 ///
 /// These errors indicate issues with configuration value retrieval or conversion.
+@available(Configuration 1.0, *)
 package enum ConfigError: Error, CustomStringConvertible, Equatable {
 
     /// A required configuration value was not found in any provider.
diff --git a/Sources/Configuration/ConfigSnapshotReader+methods.swift b/Sources/Configuration/ConfigSnapshotReader+methods.swift
index dd04aae..f9f1fcf 100644
--- a/Sources/Configuration/ConfigSnapshotReader+methods.swift
+++ b/Sources/Configuration/ConfigSnapshotReader+methods.swift
@@ -18,6 +18,7 @@
 // #                                                                           #
 // #############################################################################
 
+@available(Configuration 1.0, *)
 extension ConfigSnapshotReader {
 
     // MARK: - Get
diff --git a/Sources/Configuration/ConfigSnapshotReader+methods.swift.gyb b/Sources/Configuration/ConfigSnapshotReader+methods.swift.gyb
index 2f2d4f1..e63723a 100644
--- a/Sources/Configuration/ConfigSnapshotReader+methods.swift.gyb
+++ b/Sources/Configuration/ConfigSnapshotReader+methods.swift.gyb
@@ -16,6 +16,7 @@
   from gyb_utils import *
 }%
 ${autogenerated_warning()}
+@available(Configuration 1.0, *)
 extension ConfigSnapshotReader {
 
     // MARK: - Get
diff --git a/Sources/Configuration/ConfigSnapshotReader.swift b/Sources/Configuration/ConfigSnapshotReader.swift
index 3e749f5..f3820a9 100644
--- a/Sources/Configuration/ConfigSnapshotReader.swift
+++ b/Sources/Configuration/ConfigSnapshotReader.swift
@@ -150,6 +150,7 @@ import Synchronization
 /// When reading from a snapshot, access events are reported to the access reporter from the
 /// original config reader. This helps debug which config values are accessed, even when
 /// reading from snapshots.
+@available(Configuration 1.0, *)
 public struct ConfigSnapshotReader: Sendable {
 
     /// The prefix of the key for accessing config values in the provider.
@@ -294,6 +295,7 @@ public struct ConfigSnapshotReader: Sendable {
     }
 }
 
+@available(Configuration 1.0, *)
 extension ConfigReader {
     /// Provides a snapshot of the current configuration state and passes it to the provided closure.
     ///
@@ -380,6 +382,7 @@ extension ConfigReader {
     }
 }
 
+@available(Configuration 1.0, *)
 extension ConfigSnapshotReader {
     /// Gets a value from the snapshot.
     ///
diff --git a/Sources/Configuration/ExpressibleByConfigString.swift b/Sources/Configuration/ExpressibleByConfigString.swift
index 84fe529..40948b5 100644
--- a/Sources/Configuration/ExpressibleByConfigString.swift
+++ b/Sources/Configuration/ExpressibleByConfigString.swift
@@ -57,6 +57,7 @@ public import SystemPackage
 /// - `Foundation.URL` - Converts from URL strings.
 /// - `Foundation.UUID` - Converts from UUID strings.
 /// - `Foundation.Date` - Converts from ISO8601 date strings.
+@available(Configuration 1.0, *)
 public protocol ExpressibleByConfigString: CustomStringConvertible {
 
     /// Creates an instance from a configuration string value.
@@ -65,6 +66,7 @@ public protocol ExpressibleByConfigString: CustomStringConvertible {
     init?(configString: String)
 }
 
+@available(Configuration 1.0, *)
 extension URL: ExpressibleByConfigString {
     // swift-format-ignore: AllPublicDeclarationsHaveDocumentation
     public init?(configString: String) {
@@ -72,6 +74,7 @@ extension URL: ExpressibleByConfigString {
     }
 }
 
+@available(Configuration 1.0, *)
 extension FilePath: ExpressibleByConfigString {
     // swift-format-ignore: AllPublicDeclarationsHaveDocumentation
     public init?(configString: String) {
@@ -79,6 +82,7 @@ extension FilePath: ExpressibleByConfigString {
     }
 }
 
+@available(Configuration 1.0, *)
 extension UUID: ExpressibleByConfigString {
     // swift-format-ignore: AllPublicDeclarationsHaveDocumentation
     public init?(configString: String) {
@@ -86,6 +90,7 @@ extension UUID: ExpressibleByConfigString {
     }
 }
 
+@available(Configuration 1.0, *)
 extension Date: ExpressibleByConfigString {
     // swift-format-ignore: AllPublicDeclarationsHaveDocumentation
     public init?(configString: String) {
diff --git a/Sources/Configuration/KeyCoders/SeparatorKeyDecoder.swift b/Sources/Configuration/KeyCoders/SeparatorKeyDecoder.swift
index dc0b007..0748a94 100644
--- a/Sources/Configuration/KeyCoders/SeparatorKeyDecoder.swift
+++ b/Sources/Configuration/KeyCoders/SeparatorKeyDecoder.swift
@@ -34,6 +34,7 @@
 /// let dotDecoder = ConfigKeyDecoder.dotSeparated
 /// let colonDecoder = ConfigKeyDecoder.colonSeparated
 /// ```
+@available(Configuration 1.0, *)
 public struct SeparatorKeyDecoder: Sendable {
 
     /// The string used to separate key components.
@@ -56,6 +57,7 @@ public struct SeparatorKeyDecoder: Sendable {
     }
 }
 
+@available(Configuration 1.0, *)
 extension SeparatorKeyDecoder: ConfigKeyDecoder {
     // swift-format-ignore: AllPublicDeclarationsHaveDocumentation
     public func decode(_ string: String, context: [String: ConfigContextValue]) -> ConfigKey {
@@ -63,6 +65,7 @@ extension SeparatorKeyDecoder: ConfigKeyDecoder {
     }
 }
 
+@available(Configuration 1.0, *)
 extension ConfigKeyDecoder where Self == SeparatorKeyDecoder {
     /// A decoder that uses dot notation for hierarchical keys.
     ///
diff --git a/Sources/Configuration/MultiProvider.swift b/Sources/Configuration/MultiProvider.swift
index 2379b44..4770473 100644
--- a/Sources/Configuration/MultiProvider.swift
+++ b/Sources/Configuration/MultiProvider.swift
@@ -53,6 +53,7 @@ import Synchronization
 ///
 /// When any nested provider throws an error, the error is immediately propagated to the caller rather than
 /// being ignored. This ensures predictable behavior and prevents silent failures that could mask configuration issues.
+@available(Configuration 1.0, *)
 internal struct MultiProvider: Sendable {
 
     /// The underlying storage.
@@ -72,6 +73,7 @@ internal struct MultiProvider: Sendable {
     }
 }
 
+@available(Configuration 1.0, *)
 extension MultiProvider: CustomStringConvertible {
     /// A text description of the multi provider.
     var description: String {
@@ -83,6 +85,7 @@ extension MultiProvider: CustomStringConvertible {
 ///
 /// This snapshot aggregates the individual snapshots from each nested provider, allowing for
 /// consistent value resolution across the entire provider hierarchy at a specific moment in time.
+@available(Configuration 1.0, *)
 struct MultiSnapshot {
 
     /// The individual snapshots from each nested provider, maintained in precedence order.
@@ -121,6 +124,7 @@ struct MultiSnapshot {
     }
 }
 
+@available(Configuration 1.0, *)
 extension MultiProvider {
 
     /// Synchronously resolves a configuration value from nested providers.
diff --git a/Sources/Configuration/Providers/CLI/CLISnapshot.swift b/Sources/Configuration/Providers/CLI/CLISnapshot.swift
index 41c9382..0a2e321 100644
--- a/Sources/Configuration/Providers/CLI/CLISnapshot.swift
+++ b/Sources/Configuration/Providers/CLI/CLISnapshot.swift
@@ -42,6 +42,7 @@ import Foundation
 /// // CLI: --hosts server1 server2 server3
 /// snapshot.value(forKey: hostsKey, type: .stringArray) // -> ["server1", "server2", "server3"]
 /// ```
+@available(Configuration 1.0, *)
 internal struct CLISnapshot {
 
     /// The name of the provider that created this snapshot.
@@ -153,6 +154,7 @@ internal struct CLISnapshot {
     }
 }
 
+@available(Configuration 1.0, *)
 extension CLISnapshot: ConfigSnapshotProtocol {
     // swift-format-ignore: AllPublicDeclarationsHaveDocumentation
     func value(forKey key: AbsoluteConfigKey, type: ConfigType) throws -> LookupResult {
diff --git a/Sources/Configuration/Providers/CLI/CommandLineArgumentsProvider.swift b/Sources/Configuration/Providers/CLI/CommandLineArgumentsProvider.swift
index 0fc1e4b..08186bd 100644
--- a/Sources/Configuration/Providers/CLI/CommandLineArgumentsProvider.swift
+++ b/Sources/Configuration/Providers/CLI/CommandLineArgumentsProvider.swift
@@ -70,6 +70,7 @@
 ///     secretsSpecifier: .dynamic { key, _ in key.contains("--secret") }
 /// )
 /// ```
+@available(Configuration 1.0, *)
 public struct CommandLineArgumentsProvider {
 
     /// The underlying snapshot containing the parsed CLI arguments.
@@ -105,6 +106,7 @@ public struct CommandLineArgumentsProvider {
     }
 }
 
+@available(Configuration 1.0, *)
 extension CommandLineArgumentsProvider: CustomStringConvertible {
     // swift-format-ignore: AllPublicDeclarationsHaveDocumentation
     public var description: String {
@@ -112,6 +114,7 @@ extension CommandLineArgumentsProvider: CustomStringConvertible {
     }
 }
 
+@available(Configuration 1.0, *)
 extension CommandLineArgumentsProvider: CustomDebugStringConvertible {
     // swift-format-ignore: AllPublicDeclarationsHaveDocumentation
     public var debugDescription: String {
@@ -126,6 +129,7 @@ extension CommandLineArgumentsProvider: CustomDebugStringConvertible {
     }
 }
 
+@available(Configuration 1.0, *)
 extension CommandLineArgumentsProvider: ConfigProvider {
     // swift-format-ignore: AllPublicDeclarationsHaveDocumentation
     public var providerName: String {
diff --git a/Sources/Configuration/Providers/Common/CommonProviderFileSystem.swift b/Sources/Configuration/Providers/Common/CommonProviderFileSystem.swift
index 2c9fe0e..6d95709 100644
--- a/Sources/Configuration/Providers/Common/CommonProviderFileSystem.swift
+++ b/Sources/Configuration/Providers/Common/CommonProviderFileSystem.swift
@@ -20,6 +20,7 @@ package import Foundation
 package import SystemPackage
 
 /// A file system abstraction used by some of the providers in Configuration.
+@available(Configuration 1.0, *)
 package protocol CommonProviderFileSystem: Sendable {
     /// Loads the file contents at the specified file path.
     /// - Parameter filePath: The path to the file.
@@ -49,6 +50,7 @@ package protocol CommonProviderFileSystem: Sendable {
 }
 
 /// A file system implementation that uses the local file system.
+@available(Configuration 1.0, *)
 package struct LocalCommonProviderFileSystem: Sendable {
     /// The error thrown by the file system.
     package enum FileSystemError: Error, CustomStringConvertible {
@@ -79,6 +81,7 @@ package struct LocalCommonProviderFileSystem: Sendable {
     }
 }
 
+@available(Configuration 1.0, *)
 extension LocalCommonProviderFileSystem: CommonProviderFileSystem {
     package func fileContents(atPath filePath: FilePath) async throws -> Data {
         do {
diff --git a/Sources/Configuration/Providers/Common/ReloadingFileProviderCore.swift b/Sources/Configuration/Providers/Common/ReloadingFileProviderCore.swift
index 41ee226..afa7507 100644
--- a/Sources/Configuration/Providers/Common/ReloadingFileProviderCore.swift
+++ b/Sources/Configuration/Providers/Common/ReloadingFileProviderCore.swift
@@ -31,6 +31,7 @@ import SystemPackage
 /// This internal type handles all the common reloading logic, state management,
 /// and service lifecycle for reloading file-based providers. It allows different provider types
 /// (JSON, YAML, and so on) to reuse the same logic while providing their own format-specific deserialization.
+@available(Configuration 1.0, *)
 internal final class ReloadingFileProviderCore<SnapshotType: ConfigSnapshotProtocol>: Sendable {
 
     /// The internal storage structure for the provider state.
@@ -312,6 +313,7 @@ internal final class ReloadingFileProviderCore<SnapshotType: ConfigSnapshotProto
     }
 }
 
+@available(Configuration 1.0, *)
 extension ReloadingFileProviderCore: Service {
     internal func run() async throws {
         logger.debug("File polling starting")
@@ -350,6 +352,7 @@ extension ReloadingFileProviderCore: Service {
 
 // MARK: - ConfigProvider-like implementation
 
+@available(Configuration 1.0, *)
 extension ReloadingFileProviderCore: ConfigProvider {
 
     internal func value(forKey key: AbsoluteConfigKey, type: ConfigType) throws -> LookupResult {
diff --git a/Sources/Configuration/Providers/EnvironmentVariables/EnvironmentFileParser.swift b/Sources/Configuration/Providers/EnvironmentVariables/EnvironmentFileParser.swift
index 3be21dd..48c3661 100644
--- a/Sources/Configuration/Providers/EnvironmentVariables/EnvironmentFileParser.swift
+++ b/Sources/Configuration/Providers/EnvironmentVariables/EnvironmentFileParser.swift
@@ -45,6 +45,7 @@ import Foundation
 /// - Lines where the key is empty (starts with `=`) are ignored
 /// - When duplicate keys are found, the last occurrence takes precedence
 /// - Values can contain `=` characters (only the first `=` is used as separator)
+@available(Configuration 1.0, *)
 struct EnvironmentFileParser {
     /// Parses environment file contents into a dictionary of key-value pairs.
     ///
diff --git a/Sources/Configuration/Providers/EnvironmentVariables/EnvironmentVariablesProvider.swift b/Sources/Configuration/Providers/EnvironmentVariables/EnvironmentVariablesProvider.swift
index 6dd7cf0..aeabb03 100644
--- a/Sources/Configuration/Providers/EnvironmentVariables/EnvironmentVariablesProvider.swift
+++ b/Sources/Configuration/Providers/EnvironmentVariables/EnvironmentVariablesProvider.swift
@@ -116,6 +116,7 @@ import WASILibc
 /// ### Config context
 ///
 /// The environment variables provider ignores the context passed in ``AbsoluteConfigKey/context``.
+@available(Configuration 1.0, *)
 public struct EnvironmentVariablesProvider: Sendable {
 
     /// An environment variable value with a flag of whether it's secret.
@@ -302,6 +303,7 @@ public struct EnvironmentVariablesProvider: Sendable {
 /// A decoder of environment variable arrays.
 ///
 /// Parses a string by splitting by the specified character and trimming the components.
+@available(Configuration 1.0, *)
 internal struct EnvironmentValueArrayDecoder {
 
     /// The separator used to split the string into an array.
@@ -332,6 +334,7 @@ extension Error {
     }
 }
 
+@available(Configuration 1.0, *)
 extension EnvironmentVariablesProvider: CustomStringConvertible {
     // swift-format-ignore: AllPublicDeclarationsHaveDocumentation
     public var description: String {
@@ -339,6 +342,7 @@ extension EnvironmentVariablesProvider: CustomStringConvertible {
     }
 }
 
+@available(Configuration 1.0, *)
 extension EnvironmentVariablesProvider: CustomDebugStringConvertible {
     // swift-format-ignore: AllPublicDeclarationsHaveDocumentation
     public var debugDescription: String {
@@ -350,6 +354,7 @@ extension EnvironmentVariablesProvider: CustomDebugStringConvertible {
     }
 }
 
+@available(Configuration 1.0, *)
 extension EnvironmentVariablesProvider.Snapshot {
     /// Parses a config value from the provided raw string value.
     /// - Parameters:
@@ -436,6 +441,7 @@ extension EnvironmentVariablesProvider.Snapshot {
     }
 }
 
+@available(Configuration 1.0, *)
 extension EnvironmentVariablesProvider.Snapshot: ConfigSnapshotProtocol {
     func value(
         forKey key: AbsoluteConfigKey,
@@ -456,6 +462,7 @@ extension EnvironmentVariablesProvider.Snapshot: ConfigSnapshotProtocol {
     }
 }
 
+@available(Configuration 1.0, *)
 extension EnvironmentVariablesProvider: ConfigProvider {
     // swift-format-ignore: AllPublicDeclarationsHaveDocumentation
     public var providerName: String {
diff --git a/Sources/Configuration/Providers/Files/DirectoryFilesProvider.swift b/Sources/Configuration/Providers/Files/DirectoryFilesProvider.swift
index 6fc9ce5..b5b0ff5 100644
--- a/Sources/Configuration/Providers/Files/DirectoryFilesProvider.swift
+++ b/Sources/Configuration/Providers/Files/DirectoryFilesProvider.swift
@@ -125,6 +125,7 @@ public import SystemPackage
 ///
 /// This provider ignores the context passed in ``AbsoluteConfigKey/context``.
 /// All keys are resolved using only their component path.
+@available(Configuration 1.0, *)
 public struct DirectoryFilesProvider: Sendable {
 
     /// A file value with metadata.
@@ -254,6 +255,7 @@ public struct DirectoryFilesProvider: Sendable {
 /// A decoder of file content arrays.
 ///
 /// Parses a string by splitting by the specified character and trimming the components.
+@available(Configuration 1.0, *)
 internal struct DirectoryFilesValueArrayDecoder {
 
     /// The separator used to split the string into an array.
@@ -267,6 +269,7 @@ internal struct DirectoryFilesValueArrayDecoder {
     }
 }
 
+@available(Configuration 1.0, *)
 extension DirectoryFilesProvider: CustomStringConvertible {
     // swift-format-ignore: AllPublicDeclarationsHaveDocumentation
     public var description: String {
@@ -274,6 +277,7 @@ extension DirectoryFilesProvider: CustomStringConvertible {
     }
 }
 
+@available(Configuration 1.0, *)
 extension DirectoryFilesProvider: CustomDebugStringConvertible {
     // swift-format-ignore: AllPublicDeclarationsHaveDocumentation
     public var debugDescription: String {
@@ -294,6 +298,7 @@ extension DirectoryFilesProvider: CustomDebugStringConvertible {
     }
 }
 
+@available(Configuration 1.0, *)
 extension DirectoryFilesProvider.Snapshot {
     /// Parses a config value from the provided file value.
     /// - Parameters:
@@ -375,6 +380,7 @@ extension DirectoryFilesProvider.Snapshot {
     }
 }
 
+@available(Configuration 1.0, *)
 extension DirectoryFilesProvider.Snapshot: ConfigSnapshotProtocol {
     func value(
         forKey key: AbsoluteConfigKey,
@@ -394,6 +400,7 @@ extension DirectoryFilesProvider.Snapshot: ConfigSnapshotProtocol {
     }
 }
 
+@available(Configuration 1.0, *)
 extension DirectoryFilesProvider: ConfigProvider {
     // swift-format-ignore: AllPublicDeclarationsHaveDocumentation
     public var providerName: String {
@@ -443,11 +450,13 @@ extension DirectoryFilesProvider: ConfigProvider {
 /// Configuration keys are transformed into file names using these rules:
 /// - Components are joined with dashes
 /// - Non-alphanumeric characters (except dashes) are replaced with underscores
+@available(Configuration 1.0, *)
 public struct DirectoryFileKeyEncoder {
     /// Creates a default directory key encoder that follows standard file naming conventions.
     public init() {}
 }
 
+@available(Configuration 1.0, *)
 extension DirectoryFileKeyEncoder: ConfigKeyEncoder {
     // swift-format-ignore: AllPublicDeclarationsHaveDocumentation
     public func encode(_ key: AbsoluteConfigKey) -> String {
@@ -468,6 +477,7 @@ extension DirectoryFileKeyEncoder: ConfigKeyEncoder {
     }
 }
 
+@available(Configuration 1.0, *)
 extension ConfigKeyEncoder where Self == DirectoryFileKeyEncoder {
     /// An encoder that uses directory paths for hierarachical key encoder.
     ///
diff --git a/Sources/Configuration/Providers/InMemory/InMemoryProvider.swift b/Sources/Configuration/Providers/InMemory/InMemoryProvider.swift
index 40a02b1..b5c53ba 100644
--- a/Sources/Configuration/Providers/InMemory/InMemoryProvider.swift
+++ b/Sources/Configuration/Providers/InMemory/InMemoryProvider.swift
@@ -55,6 +55,7 @@
 /// ```
 ///
 /// To learn more about the in-memory providers, check out <doc:Using-in-memory-providers>.
+@available(Configuration 1.0, *)
 public struct InMemoryProvider: Sendable {
 
     /// The underlying snapshot of the internal state of the provider.
@@ -106,6 +107,7 @@ public struct InMemoryProvider: Sendable {
     }
 }
 
+@available(Configuration 1.0, *)
 extension InMemoryProvider {
 
     /// Creates a new in-memory provider from string keys and configuration values.
@@ -150,6 +152,7 @@ extension InMemoryProvider {
     }
 }
 
+@available(Configuration 1.0, *)
 extension InMemoryProvider: CustomStringConvertible {
     // swift-format-ignore: AllPublicDeclarationsHaveDocumentation
     public var description: String {
@@ -157,6 +160,7 @@ extension InMemoryProvider: CustomStringConvertible {
     }
 }
 
+@available(Configuration 1.0, *)
 extension InMemoryProvider: CustomDebugStringConvertible {
     // swift-format-ignore: AllPublicDeclarationsHaveDocumentation
     public var debugDescription: String {
@@ -169,6 +173,7 @@ extension InMemoryProvider: CustomDebugStringConvertible {
     }
 }
 
+@available(Configuration 1.0, *)
 extension InMemoryProvider.Snapshot: ConfigSnapshotProtocol {
     func value(
         forKey key: AbsoluteConfigKey,
@@ -186,6 +191,7 @@ extension InMemoryProvider.Snapshot: ConfigSnapshotProtocol {
     }
 }
 
+@available(Configuration 1.0, *)
 extension InMemoryProvider: ConfigProvider {
     // swift-format-ignore: AllPublicDeclarationsHaveDocumentation
     public var providerName: String {
diff --git a/Sources/Configuration/Providers/InMemory/MutableInMemoryProvider.swift b/Sources/Configuration/Providers/InMemory/MutableInMemoryProvider.swift
index d9f2dcc..0173a88 100644
--- a/Sources/Configuration/Providers/InMemory/MutableInMemoryProvider.swift
+++ b/Sources/Configuration/Providers/InMemory/MutableInMemoryProvider.swift
@@ -68,6 +68,7 @@ import Foundation
 /// ```
 ///
 /// To learn more about the in-memory providers, check out <doc:Using-in-memory-providers>.
+@available(Configuration 1.0, *)
 public final class MutableInMemoryProvider: Sendable {
 
     /// The name of this instance of the provider.
@@ -143,6 +144,7 @@ public final class MutableInMemoryProvider: Sendable {
     }
 }
 
+@available(Configuration 1.0, *)
 extension MutableInMemoryProvider {
 
     /// Creates a new mutable in-memory provider from string keys and initial values.
@@ -270,6 +272,7 @@ extension MutableInMemoryProvider {
     }
 }
 
+@available(Configuration 1.0, *)
 extension MutableInMemoryProvider: CustomStringConvertible {
     // swift-format-ignore: AllPublicDeclarationsHaveDocumentation
     public var description: String {
@@ -282,6 +285,7 @@ extension MutableInMemoryProvider: CustomStringConvertible {
     }
 }
 
+@available(Configuration 1.0, *)
 extension MutableInMemoryProvider: CustomDebugStringConvertible {
     // swift-format-ignore: AllPublicDeclarationsHaveDocumentation
     public var debugDescription: String {
@@ -299,6 +303,7 @@ extension MutableInMemoryProvider: CustomDebugStringConvertible {
     }
 }
 
+@available(Configuration 1.0, *)
 extension MutableInMemoryProvider.Storage {
     /// Returns the number of current watchers, summing value and snapshot watchers.
     func watcherCount() -> Int {
@@ -306,6 +311,7 @@ extension MutableInMemoryProvider.Storage {
     }
 }
 
+@available(Configuration 1.0, *)
 extension MutableInMemoryProvider {
     /// Adds a continuation that gets notified of new values for the provided key.
     /// - Parameters:
@@ -366,6 +372,7 @@ extension MutableInMemoryProvider {
     }
 }
 
+@available(Configuration 1.0, *)
 extension MutableInMemoryProvider.Snapshot: ConfigSnapshotProtocol {
     func value(forKey key: AbsoluteConfigKey, type: ConfigType) throws -> LookupResult {
         try MutableInMemoryProvider.parseValue(
@@ -383,6 +390,7 @@ private func providerNameFromName(_ name: String?) -> String {
     "MutableInMemoryProvider\(name.map { "[\($0)]" } ?? "")"
 }
 
+@available(Configuration 1.0, *)
 extension MutableInMemoryProvider: ConfigProvider {
     // swift-format-ignore: AllPublicDeclarationsHaveDocumentation
     public var providerName: String {
diff --git a/Sources/Configuration/Providers/JSON/JSONProvider.swift b/Sources/Configuration/Providers/JSON/JSONProvider.swift
index eaa6466..52de70e 100644
--- a/Sources/Configuration/Providers/JSON/JSONProvider.swift
+++ b/Sources/Configuration/Providers/JSON/JSONProvider.swift
@@ -83,6 +83,7 @@ import Foundation
 ///
 /// This provider ignores the context passed in ``AbsoluteConfigKey/context``.
 /// All keys are resolved using only their component path.
+@available(Configuration 1.0, *)
 public struct JSONProvider: Sendable {
 
     /// A snapshot of the internal state.
@@ -181,6 +182,7 @@ public struct JSONProvider: Sendable {
     }
 }
 
+@available(Configuration 1.0, *)
 extension JSONProvider: CustomStringConvertible {
     // swift-format-ignore: AllPublicDeclarationsHaveDocumentation
     public var description: String {
@@ -188,6 +190,7 @@ extension JSONProvider: CustomStringConvertible {
     }
 }
 
+@available(Configuration 1.0, *)
 extension JSONProvider: CustomDebugStringConvertible {
     // swift-format-ignore: AllPublicDeclarationsHaveDocumentation
     public var debugDescription: String {
@@ -199,6 +202,7 @@ extension JSONProvider: CustomDebugStringConvertible {
     }
 }
 
+@available(Configuration 1.0, *)
 extension JSONProvider: ConfigProvider {
     // swift-format-ignore: AllPublicDeclarationsHaveDocumentation
     public var providerName: String {
diff --git a/Sources/Configuration/Providers/JSON/JSONProviderSnapshot.swift b/Sources/Configuration/Providers/JSON/JSONProviderSnapshot.swift
index 32ee4b1..07253f4 100644
--- a/Sources/Configuration/Providers/JSON/JSONProviderSnapshot.swift
+++ b/Sources/Configuration/Providers/JSON/JSONProviderSnapshot.swift
@@ -23,6 +23,7 @@ import Foundation
 ///
 /// This structure represents a point-in-time view of configuration values. It handles
 /// the conversion from JSON types to configuration value types.
+@available(Configuration 1.0, *)
 internal struct JSONProviderSnapshot {
     /// The key encoder for JSON.
     static let keyEncoder: SeparatorKeyEncoder = .dotSeparated
@@ -300,6 +301,7 @@ internal struct JSONProviderSnapshot {
     }
 }
 
+@available(Configuration 1.0, *)
 extension JSONProviderSnapshot: ConfigSnapshotProtocol {
     var providerName: String {
         "JSONProvider"
@@ -324,6 +326,7 @@ extension JSONProviderSnapshot: ConfigSnapshotProtocol {
 ///   - secretsSpecifier: The secrets specifier.
 /// - Throws: When parsing fails.
 /// - Returns: The parsed and validated JSON config values.
+@available(Configuration 1.0, *)
 internal func parseValues(
     _ parsedDictionary: [String: any Sendable],
     keyEncoder: some ConfigKeyEncoder,
diff --git a/Sources/Configuration/Providers/JSON/ReloadingJSONProvider.swift b/Sources/Configuration/Providers/JSON/ReloadingJSONProvider.swift
index 2ee16ed..df6ce8f 100644
--- a/Sources/Configuration/Providers/JSON/ReloadingJSONProvider.swift
+++ b/Sources/Configuration/Providers/JSON/ReloadingJSONProvider.swift
@@ -59,6 +59,7 @@ import Foundation
 /// Check out ``JSONProvider`` to learn more about using JSON for configuration. ``ReloadingJSONProvider`` is
 /// a reloading variant of ``JSONProvider`` that otherwise follows the same behavior for handling secrets,
 /// key and context mapping, and so on.
+@available(Configuration 1.0, *)
 public final class ReloadingJSONProvider: Sendable {
 
     /// The core implementation that handles all reloading logic.
@@ -203,6 +204,7 @@ public final class ReloadingJSONProvider: Sendable {
     }
 }
 
+@available(Configuration 1.0, *)
 extension ReloadingJSONProvider: CustomStringConvertible {
     // swift-format-ignore: AllPublicDeclarationsHaveDocumentation
     public var description: String {
@@ -211,6 +213,7 @@ extension ReloadingJSONProvider: CustomStringConvertible {
     }
 }
 
+@available(Configuration 1.0, *)
 extension ReloadingJSONProvider: CustomDebugStringConvertible {
     // swift-format-ignore: AllPublicDeclarationsHaveDocumentation
     public var debugDescription: String {
@@ -223,6 +226,7 @@ extension ReloadingJSONProvider: CustomDebugStringConvertible {
     }
 }
 
+@available(Configuration 1.0, *)
 extension ReloadingJSONProvider: ConfigProvider {
     // swift-format-ignore: AllPublicDeclarationsHaveDocumentation
     public var providerName: String {
@@ -261,6 +265,7 @@ extension ReloadingJSONProvider: ConfigProvider {
     }
 }
 
+@available(Configuration 1.0, *)
 extension ReloadingJSONProvider: Service {
     // swift-format-ignore: AllPublicDeclarationsHaveDocumentation
     public func run() async throws {
diff --git a/Sources/Configuration/Providers/Wrappers/ConfigProvider+Operators.swift b/Sources/Configuration/Providers/Wrappers/ConfigProvider+Operators.swift
index b8de87b..3bd028b 100644
--- a/Sources/Configuration/Providers/Wrappers/ConfigProvider+Operators.swift
+++ b/Sources/Configuration/Providers/Wrappers/ConfigProvider+Operators.swift
@@ -12,6 +12,7 @@
 //
 //===----------------------------------------------------------------------===//
 
+@available(Configuration 1.0, *)
 extension ConfigProvider {
     /// Creates a new prefixed configuration provider.
     ///
diff --git a/Sources/Configuration/Providers/Wrappers/KeyMappingProvider.swift b/Sources/Configuration/Providers/Wrappers/KeyMappingProvider.swift
index 9ee7e5c..5357568 100644
--- a/Sources/Configuration/Providers/Wrappers/KeyMappingProvider.swift
+++ b/Sources/Configuration/Providers/Wrappers/KeyMappingProvider.swift
@@ -61,6 +61,7 @@
 ///     key.prepending(["myapp", "prod"])
 /// }
 /// ```
+@available(Configuration 1.0, *)
 public struct KeyMappingProvider<Upstream: ConfigProvider>: Sendable {
     /// The mapping function applied to each key before a lookup.
     private let mapKey: @Sendable (AbsoluteConfigKey) -> AbsoluteConfigKey
@@ -82,6 +83,7 @@ public struct KeyMappingProvider<Upstream: ConfigProvider>: Sendable {
     }
 }
 
+@available(Configuration 1.0, *)
 extension KeyMappingProvider: ConfigProvider {
     // swift-format-ignore: AllPublicDeclarationsHaveDocumentation
     public var providerName: String {
@@ -132,6 +134,7 @@ extension KeyMappingProvider: ConfigProvider {
 }
 
 /// A configuration snapshot that maps all keys before delegating to an upstream snapshot.
+@available(Configuration 1.0, *)
 private struct MappedKeySnapshot: ConfigSnapshotProtocol {
 
     /// The prefix key to prepend to all configuration keys.
@@ -149,6 +152,7 @@ private struct MappedKeySnapshot: ConfigSnapshotProtocol {
     }
 }
 
+@available(Configuration 1.0, *)
 extension KeyMappingProvider: CustomStringConvertible {
     // swift-format-ignore: AllPublicDeclarationsHaveDocumentation
     public var description: String {
@@ -156,6 +160,7 @@ extension KeyMappingProvider: CustomStringConvertible {
     }
 }
 
+@available(Configuration 1.0, *)
 extension KeyMappingProvider: CustomDebugStringConvertible {
     // swift-format-ignore: AllPublicDeclarationsHaveDocumentation
     public var debugDescription: String {
diff --git a/Sources/Configuration/Providers/YAML/ReloadingYAMLProvider.swift b/Sources/Configuration/Providers/YAML/ReloadingYAMLProvider.swift
index 85972d1..96c81fe 100644
--- a/Sources/Configuration/Providers/YAML/ReloadingYAMLProvider.swift
+++ b/Sources/Configuration/Providers/YAML/ReloadingYAMLProvider.swift
@@ -64,6 +64,7 @@ import Foundation
 /// Check out ``YAMLProvider`` to learn more about using YAML for configuration. ``ReloadingYAMLProvider`` is
 /// a reloading variant of ``YAMLProvider`` that otherwise follows the same behavior for handling secrets,
 /// key and context mapping, and so on.
+@available(Configuration 1.0, *)
 public final class ReloadingYAMLProvider: Sendable {
 
     /// The core implementation that handles all reloading logic.
@@ -207,6 +208,7 @@ public final class ReloadingYAMLProvider: Sendable {
     }
 }
 
+@available(Configuration 1.0, *)
 extension ReloadingYAMLProvider: CustomStringConvertible {
     // swift-format-ignore: AllPublicDeclarationsHaveDocumentation
     public var description: String {
@@ -217,6 +219,7 @@ extension ReloadingYAMLProvider: CustomStringConvertible {
     }
 }
 
+@available(Configuration 1.0, *)
 extension ReloadingYAMLProvider: CustomDebugStringConvertible {
     // swift-format-ignore: AllPublicDeclarationsHaveDocumentation
     public var debugDescription: String {
@@ -232,6 +235,7 @@ extension ReloadingYAMLProvider: CustomDebugStringConvertible {
     }
 }
 
+@available(Configuration 1.0, *)
 extension ReloadingYAMLProvider: ConfigProvider {
     // swift-format-ignore: AllPublicDeclarationsHaveDocumentation
     public var providerName: String {
@@ -270,6 +274,7 @@ extension ReloadingYAMLProvider: ConfigProvider {
     }
 }
 
+@available(Configuration 1.0, *)
 extension ReloadingYAMLProvider: Service {
     // swift-format-ignore: AllPublicDeclarationsHaveDocumentation
     public func run() async throws {
diff --git a/Sources/Configuration/Providers/YAML/YAMLProvider.swift b/Sources/Configuration/Providers/YAML/YAMLProvider.swift
index 63c5e56..99e56eb 100644
--- a/Sources/Configuration/Providers/YAML/YAMLProvider.swift
+++ b/Sources/Configuration/Providers/YAML/YAMLProvider.swift
@@ -86,6 +86,7 @@ import Foundation
 ///
 /// This provider ignores the context passed in ``AbsoluteConfigKey/context``.
 /// All keys are resolved using only their component path.
+@available(Configuration 1.0, *)
 public struct YAMLProvider: Sendable {
 
     /// A snapshot of the internal state.
@@ -184,6 +185,7 @@ public struct YAMLProvider: Sendable {
     }
 }
 
+@available(Configuration 1.0, *)
 extension YAMLProvider: CustomStringConvertible {
     // swift-format-ignore: AllPublicDeclarationsHaveDocumentation
     public var description: String {
@@ -193,6 +195,7 @@ extension YAMLProvider: CustomStringConvertible {
     }
 }
 
+@available(Configuration 1.0, *)
 extension YAMLProvider: CustomDebugStringConvertible {
     // swift-format-ignore: AllPublicDeclarationsHaveDocumentation
     public var debugDescription: String {
@@ -207,6 +210,7 @@ extension YAMLProvider: CustomDebugStringConvertible {
     }
 }
 
+@available(Configuration 1.0, *)
 extension YAMLProvider: ConfigProvider {
     // swift-format-ignore: AllPublicDeclarationsHaveDocumentation
     public var providerName: String {
diff --git a/Sources/Configuration/Providers/YAML/YAMLProviderSnapshot.swift b/Sources/Configuration/Providers/YAML/YAMLProviderSnapshot.swift
index 4365d00..a50de00 100644
--- a/Sources/Configuration/Providers/YAML/YAMLProviderSnapshot.swift
+++ b/Sources/Configuration/Providers/YAML/YAMLProviderSnapshot.swift
@@ -27,6 +27,7 @@ import SystemPackage
 ///
 /// This class represents a point-in-time view of configuration values. It handles
 /// the conversion from YAML types to configuration value types.
+@available(Configuration 1.0, *)
 final class YAMLProviderSnapshot: Sendable {
     /// The key encoder for YAML.
     private static let keyEncoder: SeparatorKeyEncoder = .dotSeparated
@@ -238,6 +239,7 @@ final class YAMLProviderSnapshot: Sendable {
     }
 }
 
+@available(Configuration 1.0, *)
 extension YAMLProviderSnapshot: ConfigSnapshotProtocol {
     var providerName: String {
         "YAMLProvider"
@@ -268,6 +270,7 @@ extension YAMLProviderSnapshot: ConfigSnapshotProtocol {
 ///   - secretsSpecifier: The secrets specifier.
 /// - Throws: When parsing fails.
 /// - Returns: The parsed and validated YAML config values.
+@available(Configuration 1.0, *)
 internal func parseValues(
     _ parsedDictionary: Yams.Node.Mapping,
     keyEncoder: some ConfigKeyEncoder,
diff --git a/Sources/Configuration/Utilities/AsyncSequences.swift b/Sources/Configuration/Utilities/AsyncSequences.swift
index 23fb959..260a981 100644
--- a/Sources/Configuration/Utilities/AsyncSequences.swift
+++ b/Sources/Configuration/Utilities/AsyncSequences.swift
@@ -13,6 +13,7 @@
 //===----------------------------------------------------------------------===//
 
 /// A concrete async sequence for delivering updated configuration values.
+@available(Configuration 1.0, *)
 public struct ConfigUpdatesAsyncSequence<Element: Sendable, Failure: Error> {
 
     /// The upstream async sequence that this concrete sequence wraps.
@@ -29,6 +30,7 @@ public struct ConfigUpdatesAsyncSequence<Element: Sendable, Failure: Error> {
     }
 }
 
+@available(Configuration 1.0, *)
 extension ConfigUpdatesAsyncSequence: AsyncSequence {
 
     /// An async iterator that wraps an existential async iterator.
@@ -57,6 +59,7 @@ extension ConfigUpdatesAsyncSequence: AsyncSequence {
 
 // MARK: - AsyncSequence extensions
 
+@available(Configuration 1.0, *)
 extension AsyncSequence where Failure == Never {
 
     /// Maps each element of the sequence using a throwing transform, introducing a failure type.
@@ -106,6 +109,7 @@ extension AsyncSequence where Failure == Never {
 /// - `Failure`: The error type that the transform function can throw.
 /// - `Value`: The input element type from the upstream sequence.
 /// - `Upstream`: The upstream async sequence type that never throws.
+@available(Configuration 1.0, *)
 private struct MapThrowingAsyncSequence<Element, Failure: Error, Value, Upstream: AsyncSequence<Value, Never>> {
 
     /// The upstream async sequence to transform.
@@ -115,6 +119,7 @@ private struct MapThrowingAsyncSequence<Element, Failure: Error, Value, Upstream
     var transform: (Value) throws(Failure) -> Element
 }
 
+@available(Configuration 1.0, *)
 extension MapThrowingAsyncSequence: AsyncSequence {
 
     // swift-format-ignore: AllPublicDeclarationsHaveDocumentation
diff --git a/Sources/Configuration/Utilities/FoundationExtensions.swift b/Sources/Configuration/Utilities/FoundationExtensions.swift
index d927334..25d92e8 100644
--- a/Sources/Configuration/Utilities/FoundationExtensions.swift
+++ b/Sources/Configuration/Utilities/FoundationExtensions.swift
@@ -22,6 +22,7 @@ func printToStderr(_ string: String) {
     _ = try? FileDescriptor.standardError.writeAll(message.utf8)
 }
 
+@available(Configuration 1.0, *)
 extension StringProtocol {
     /// Returns the contents of the string with any whitespace prefix and suffix trimmed.
     /// - Returns: The trimmed string.
diff --git a/Sources/Configuration/Utilities/combineLatestOneOrMore.swift b/Sources/Configuration/Utilities/combineLatestOneOrMore.swift
index b108d4e..d4f6a00 100644
--- a/Sources/Configuration/Utilities/combineLatestOneOrMore.swift
+++ b/Sources/Configuration/Utilities/combineLatestOneOrMore.swift
@@ -19,6 +19,7 @@ import Synchronization
 /// This class coordinates the "combine latest" operation by storing the most recent
 /// value from each source sequence and emitting combined arrays only when all sources
 /// have produced at least one value.
+@available(Configuration 1.0, *)
 private final class Combiner<Element: Sendable>: Sendable {
 
     /// The internal state.
@@ -101,6 +102,7 @@ private final class Combiner<Element: Sendable>: Sendable {
 /// - Throws: When any source throws, when the handler throws, or when cancelled.
 /// - Returns: The value returned by the handler.
 /// - Precondition: `sources` must not be empty.
+@available(Configuration 1.0, *)
 func combineLatestOneOrMore<Element: Sendable, Return>(
     elementType: Element.Type = Element.self,
     sources: [@Sendable ((ConfigUpdatesAsyncSequence<Element, Never>) async throws -> Void) async throws -> Void],
diff --git a/Sources/ConfigurationTesting/ProviderCompatTest.swift b/Sources/ConfigurationTesting/ProviderCompatTest.swift
index 532dea5..8a9cf27 100644
--- a/Sources/ConfigurationTesting/ProviderCompatTest.swift
+++ b/Sources/ConfigurationTesting/ProviderCompatTest.swift
@@ -61,6 +61,7 @@ import ConfigurationTestingInternal
 ///     "other.byteChunky.array": [[UInt8]]([.magic, .magic2, .magic]),
 /// ]
 /// ```
+@available(Configuration 1.0, *)
 public struct ProviderCompatTest: Sendable {
 
     /// Configuration options for customizing test behavior.
@@ -147,6 +148,7 @@ public struct ProviderCompatTest: Sendable {
     ]
 }
 
+@available(Configuration 1.0, *)
 extension ProviderCompatTest {
 
     private func value() throws {
diff --git a/Sources/ConfigurationTestingInternal/AccessReporterTestUtils.swift b/Sources/ConfigurationTestingInternal/AccessReporterTestUtils.swift
index 521dc09..3c21673 100644
--- a/Sources/ConfigurationTestingInternal/AccessReporterTestUtils.swift
+++ b/Sources/ConfigurationTestingInternal/AccessReporterTestUtils.swift
@@ -22,6 +22,7 @@ import Foundation
 import Testing
 
 /// A test-only access reporter that records events for later inspection.
+@available(Configuration 1.0, *)
 package final class TestAccessReporter: Sendable {
 
     /// The internal storage.
@@ -45,6 +46,7 @@ package final class TestAccessReporter: Sendable {
     }
 }
 
+@available(Configuration 1.0, *)
 extension TestAccessReporter: AccessReporter {
     package func report(_ event: AccessEvent) {
         storage.withLock { $0.events.append(event) }
diff --git a/Sources/ConfigurationTestingInternal/AsyncSequence+first.swift b/Sources/ConfigurationTestingInternal/AsyncSequence+first.swift
index c77a7df..8c9cbe8 100644
--- a/Sources/ConfigurationTestingInternal/AsyncSequence+first.swift
+++ b/Sources/ConfigurationTestingInternal/AsyncSequence+first.swift
@@ -12,6 +12,7 @@
 //
 //===----------------------------------------------------------------------===//
 
+@available(Configuration 1.0, *)
 extension AsyncSequence where Failure == Never {
     /// Returns the first element of the async sequence, or nil if the sequence completes before emitting an element.
     package var first: Element? {
@@ -21,6 +22,7 @@ extension AsyncSequence where Failure == Never {
     }
 }
 
+@available(Configuration 1.0, *)
 extension AsyncSequence {
     /// Returns the first element of the async sequence, or nil if the sequence completes before emitting an element.
     package var first: Element? {
@@ -33,6 +35,7 @@ extension AsyncSequence {
 /// Returns the first element of the async sequence, or nil if the sequence completes before emitting an element.
 /// - Parameter updates: The async sequence to get the first element from.
 /// - Returns: The first element, or nil if empty.
+@available(Configuration 1.0, *)
 package func awaitFirst<Value: Sendable>(updates: any AsyncSequence<Value, Never>) async -> Value? {
     await updates.first
 }
@@ -41,6 +44,7 @@ package func awaitFirst<Value: Sendable>(updates: any AsyncSequence<Value, Never
 /// - Parameter updates: The async sequence to get the first element from.
 /// - Returns: The first element, or nil if empty.
 /// - Throws: Any error thrown by the async sequence.
+@available(Configuration 1.0, *)
 package func awaitFirst<Value: Sendable>(updates: any AsyncSequence<Value, any Error>) async throws -> Value? {
     try await updates.first
 }
diff --git a/Sources/ConfigurationTestingInternal/CannedValues.swift b/Sources/ConfigurationTestingInternal/CannedValues.swift
index 108f2ce..928b4ef 100644
--- a/Sources/ConfigurationTestingInternal/CannedValues.swift
+++ b/Sources/ConfigurationTestingInternal/CannedValues.swift
@@ -33,6 +33,7 @@ import Testing
 ///
 /// print(cannedResponses.values) // ["third"]
 /// ```
+@available(Configuration 1.0, *)
 package final class CannedValues<T: Sendable>: Sendable {
 
     /// Thread-safe storage for the remaining values.
diff --git a/Sources/ConfigurationTestingInternal/CollectingLogHandler.swift b/Sources/ConfigurationTestingInternal/CollectingLogHandler.swift
index d8c5740..8687df4 100644
--- a/Sources/ConfigurationTestingInternal/CollectingLogHandler.swift
+++ b/Sources/ConfigurationTestingInternal/CollectingLogHandler.swift
@@ -18,6 +18,7 @@ package import Logging
 import Synchronization
 
 /// A  single logged entry with level, message, and metadata.
+@available(Configuration 1.0, *)
 package struct Entry: Sendable, Equatable {
 
     /// The log level.
@@ -42,6 +43,7 @@ package struct Entry: Sendable, Equatable {
 }
 
 /// A log handler that collects log entries in memory for inspection.
+@available(Configuration 1.0, *)
 package struct CollectingLogHandler: LogHandler {
 
     /// The metadata applied to all log messages from this handler.
diff --git a/Sources/ConfigurationTestingInternal/ConfigValueExtensions.swift b/Sources/ConfigurationTestingInternal/ConfigValueExtensions.swift
index eb613b4..fa55716 100644
--- a/Sources/ConfigurationTestingInternal/ConfigValueExtensions.swift
+++ b/Sources/ConfigurationTestingInternal/ConfigValueExtensions.swift
@@ -24,6 +24,7 @@ extension [UInt8] {
     }
 }
 
+@available(Configuration 1.0, *)
 extension ConfigValue {
     package static var magic: Self {
         ConfigValue(.bytes(.magic), isSecret: false)
@@ -34,6 +35,7 @@ extension ConfigValue {
     }
 }
 
+@available(Configuration 1.0, *)
 extension ConfigValue {
 
     /// Creates a new string configuration value.
diff --git a/Sources/ConfigurationTestingInternal/InMemoryFileSystem.swift b/Sources/ConfigurationTestingInternal/InMemoryFileSystem.swift
index 562f918..d02a840 100644
--- a/Sources/ConfigurationTestingInternal/InMemoryFileSystem.swift
+++ b/Sources/ConfigurationTestingInternal/InMemoryFileSystem.swift
@@ -22,6 +22,7 @@ package import SystemPackage
 import Synchronization
 
 /// A simple in-memory file system used for testing.
+@available(Configuration 1.0, *)
 package final class InMemoryFileSystem: Sendable {
 
     /// Represents the type of data stored in the in-memory file system.
@@ -97,6 +98,7 @@ package final class InMemoryFileSystem: Sendable {
     }
 }
 
+@available(Configuration 1.0, *)
 extension InMemoryFileSystem: CommonProviderFileSystem {
     func listFileNames(atPath directoryPath: FilePath) async throws -> [String] {
         let prefixComponents = directoryPath.components
diff --git a/Sources/ConfigurationTestingInternal/TestFuture.swift b/Sources/ConfigurationTestingInternal/TestFuture.swift
index 367849e..f1e7dd0 100644
--- a/Sources/ConfigurationTestingInternal/TestFuture.swift
+++ b/Sources/ConfigurationTestingInternal/TestFuture.swift
@@ -37,6 +37,7 @@ import Foundation
 /// // In test code
 /// let result = await future.value
 /// ```
+@available(Configuration 1.0, *)
 package final class TestFuture<T: Sendable>: @unchecked Sendable /* lock + locked_state */ {
 
     /// The internal state of the future.
diff --git a/Sources/ConfigurationTestingInternal/TestProvider.swift b/Sources/ConfigurationTestingInternal/TestProvider.swift
index a2ea08a..0b8f25e 100644
--- a/Sources/ConfigurationTestingInternal/TestProvider.swift
+++ b/Sources/ConfigurationTestingInternal/TestProvider.swift
@@ -32,6 +32,7 @@ import Testing
 ///     "error.key": .failure(TestProvider.TestError())
 /// ])
 /// ```
+@available(Configuration 1.0, *)
 package struct TestProvider: Sendable {
 
     /// A generic error type for testing error scenarios.
@@ -53,6 +54,7 @@ package struct TestProvider: Sendable {
     }
 }
 
+@available(Configuration 1.0, *)
 extension TestProvider {
 
     /// Creates a new test provider with string-based key mappings.
@@ -80,6 +82,7 @@ extension TestProvider {
     }
 }
 
+@available(Configuration 1.0, *)
 extension TestProvider: ConfigProvider, ConfigSnapshotProtocol {
     package var providerName: String {
         "TestProvider"
diff --git a/Sources/ConfigurationTestingInternal/withService.swift b/Sources/ConfigurationTestingInternal/withService.swift
index e3651b9..f07efb3 100644
--- a/Sources/ConfigurationTestingInternal/withService.swift
+++ b/Sources/ConfigurationTestingInternal/withService.swift
@@ -40,6 +40,7 @@ package import ServiceLifecycle
 ///   - work: The test work to perform with the running service.
 /// - Returns: The result produced by the work closure.
 /// - Throws: Rethrows errors from service creation, service execution, or test work.
+@available(Configuration 1.0, *)
 package func withService<S: Service, R>(createService: () async throws -> S, work: (S) async throws -> R) async throws
     -> R
 {
diff --git a/Tests/ConfigurationTests/AccessLoggerTests.swift b/Tests/ConfigurationTests/AccessLoggerTests.swift
index f156220..68def8c 100644
--- a/Tests/ConfigurationTests/AccessLoggerTests.swift
+++ b/Tests/ConfigurationTests/AccessLoggerTests.swift
@@ -21,6 +21,7 @@ import Synchronization
 import ConfigurationTestingInternal
 
 struct AccessLoggerTests {
+    @available(Configuration 1.0, *)
     @Test func test() throws {
         let collectingLogHandler = CollectingLogHandler()
         let logger = Logger(label: "Test", factory: { _ in collectingLogHandler })
diff --git a/Tests/ConfigurationTests/AccessReporterTests.swift b/Tests/ConfigurationTests/AccessReporterTests.swift
index ea9812b..206c1b5 100644
--- a/Tests/ConfigurationTests/AccessReporterTests.swift
+++ b/Tests/ConfigurationTests/AccessReporterTests.swift
@@ -22,6 +22,7 @@ struct AccessReporterTests {
         case info
     }
 
+    @available(Configuration 1.0, *)
     @Test func get() async throws {
         let accessReporter = TestAccessReporter()
         let provider = InMemoryProvider(
@@ -198,6 +199,7 @@ struct AccessReporterTests {
         )
     }
 
+    @available(Configuration 1.0, *)
     @Test func fetch() async throws {
         let accessReporter = TestAccessReporter()
         let provider = InMemoryProvider(
@@ -393,6 +395,7 @@ struct AccessReporterTests {
         )
     }
 
+    @available(Configuration 1.0, *)
     @Test func watch() async throws {
         let accessReporter = TestAccessReporter()
         let provider = InMemoryProvider(
diff --git a/Tests/ConfigurationTests/AsyncSequencesTests.swift b/Tests/ConfigurationTests/AsyncSequencesTests.swift
index 613d7e2..04f563f 100644
--- a/Tests/ConfigurationTests/AsyncSequencesTests.swift
+++ b/Tests/ConfigurationTests/AsyncSequencesTests.swift
@@ -26,6 +26,7 @@ struct AsyncSequencesTests {
 
     // MARK: - ConfigUpdatesAsyncSequence tests
 
+    @available(Configuration 1.0, *)
     @Test func updatesAsyncSequenceWrapsExistentialSequence() async throws {
         let values = [1, 2, 3, 4, 5]
         let updatesSequence = ConfigUpdatesAsyncSequence(values.async)
@@ -33,12 +34,14 @@ struct AsyncSequencesTests {
         #expect(results == values)
     }
 
+    @available(Configuration 1.0, *)
     @Test func updatesAsyncSequenceWithEmptySequence() async throws {
         let updatesSequence = ConfigUpdatesAsyncSequence(([] as [Int]).async)
         let results = await updatesSequence.collect()
         #expect(results.isEmpty)
     }
 
+    @available(Configuration 1.0, *)
     @Test func updatesAsyncSequencePropagatesErrors() async throws {
         let throwingSequence = AsyncThrowingStream<Int, any Error> { continuation in
             continuation.yield(1)
@@ -59,6 +62,7 @@ struct AsyncSequencesTests {
 
     // MARK: - mapThrowing Tests
 
+    @available(Configuration 1.0, *)
     @Test func mapThrowingSuccessfulTransformation() async throws {
         let values = [1, 2, 3]
         let asyncSequence = values.async
@@ -71,6 +75,7 @@ struct AsyncSequencesTests {
         #expect(results == expected)
     }
 
+    @available(Configuration 1.0, *)
     @Test func mapThrowingWithEmptySequence() async throws {
         let emptySequence = ([] as [Int]).async
         let mappedSequence = emptySequence.mapThrowing { value -> String in
@@ -81,6 +86,7 @@ struct AsyncSequencesTests {
         #expect(results.isEmpty)
     }
 
+    @available(Configuration 1.0, *)
     @Test func mapThrowingPropagatesTransformErrors() async throws {
         let asyncSequence = [1, 2, 3, 4, 5].async
         let mappedSequence = asyncSequence.mapThrowing { value -> String in
@@ -103,6 +109,7 @@ struct AsyncSequencesTests {
 
 // MARK: - Test Utilities
 
+@available(Configuration 1.0, *)
 extension AsyncSequence where Failure == Never {
     /// Collects all elements from the async sequence into an array.
     ///
@@ -121,6 +128,7 @@ extension AsyncSequence where Failure == Never {
     }
 }
 
+@available(Configuration 1.0, *)
 extension AsyncSequence {
     /// Collects all elements from the async sequence into an array.
     ///
diff --git a/Tests/ConfigurationTests/CLIArgumentParserTests.swift b/Tests/ConfigurationTests/CLIArgumentParserTests.swift
index 3d138ee..cf6c484 100644
--- a/Tests/ConfigurationTests/CLIArgumentParserTests.swift
+++ b/Tests/ConfigurationTests/CLIArgumentParserTests.swift
@@ -19,8 +19,12 @@ import Testing
 
 struct CLIArgumentParserTests {
 
-    let parser = CLIArgumentParser()
+    @available(Configuration 1.0, *)
+    var parser: CLIArgumentParser {
+        .init()
+    }
 
+    @available(Configuration 1.0, *)
     @Test func parsing() {
         #expect(parser.parse([]).isEmpty)
         #expect(parser.parse(["program"]).isEmpty)
diff --git a/Tests/ConfigurationTests/CLIKeyEncoderTests.swift b/Tests/ConfigurationTests/CLIKeyEncoderTests.swift
index a6707d0..36cbcb6 100644
--- a/Tests/ConfigurationTests/CLIKeyEncoderTests.swift
+++ b/Tests/ConfigurationTests/CLIKeyEncoderTests.swift
@@ -18,9 +18,9 @@ import Foundation
 
 struct CLIKeyEncoderTests {
 
-    let encoder = CLIKeyEncoder()
-
+    @available(Configuration 1.0, *)
     @Test func encoding() {
+        let encoder = CLIKeyEncoder()
         #expect(encoder.encode(["host"]) == "--host")
         #expect(encoder.encode(["app", "database", "host"]) == "--app-database-host")
         #expect(encoder.encode(["maxRetryCount"]) == "--max-retry-count")
diff --git a/Tests/ConfigurationTests/CommandLineArgumentsProviderTests.swift b/Tests/ConfigurationTests/CommandLineArgumentsProviderTests.swift
index ed66b17..4fdecaa 100644
--- a/Tests/ConfigurationTests/CommandLineArgumentsProviderTests.swift
+++ b/Tests/ConfigurationTests/CommandLineArgumentsProviderTests.swift
@@ -21,14 +21,15 @@ import Foundation
 import ConfigurationTesting
 
 struct CommandLineArgumentsProviderTests {
-    let provider: CommandLineArgumentsProvider
-    init() {
+
+    @available(Configuration 1.0, *)
+    var provider: CommandLineArgumentsProvider {
         // Convert magic byte arrays to base64
         let magicBase64 = "bWFnaWM="
         let magic2Base64 = "bWFnaWMy"
 
         // Create a provider with the expected test data format for ProviderCompatTest
-        provider = CommandLineArgumentsProvider(arguments: [
+        return CommandLineArgumentsProvider(arguments: [
             "program",
             "--string", "Hello",
             "--other-string", "Other Hello",
@@ -53,6 +54,7 @@ struct CommandLineArgumentsProviderTests {
         ])
     }
 
+    @available(Configuration 1.0, *)
     @Test func printingDescription() throws {
         let expectedDescription = #"""
             CommandLineArgumentsProvider[20 values]
@@ -60,6 +62,7 @@ struct CommandLineArgumentsProviderTests {
         #expect(provider.description == expectedDescription)
     }
 
+    @available(Configuration 1.0, *)
     @Test func printingDebugDescription() throws {
         let expectedDebugDescription = #"""
             CommandLineArgumentsProvider[20 values: --bool=true, --booly-array=true,false, --byte-chunky-array=bWFnaWM=,bWFnaWMy, --bytes=bWFnaWM=, --double=3.14, --doubly-array=3.14,2.72, --int=42, --inty-array=42,24, --other-bool=false, --other-booly-array=false,true,true, --other-byte-chunky-array=bWFnaWM=,bWFnaWMy,bWFnaWM=, --other-bytes=bWFnaWMy, --other-double=2.72, --other-doubly-array=0.9,1.8, --other-int=24, --other-inty-array=16,32, --other-string=Other Hello, --other-stringy-array=Hello,Swift, --string=Hello, --stringy-array=Hello,World]
@@ -67,10 +70,12 @@ struct CommandLineArgumentsProviderTests {
         #expect(provider.debugDescription == expectedDebugDescription)
     }
 
+    @available(Configuration 1.0, *)
     @Test func compat() async throws {
         try await ProviderCompatTest(provider: provider).run()
     }
 
+    @available(Configuration 1.0, *)
     @Test func secretSpecifier() throws {
         let provider = CommandLineArgumentsProvider(
             arguments: ["program", "--api-token", "s3cret", "--hostname", "localhost"],
diff --git a/Tests/ConfigurationTests/ConfigProvider+OperatorTests.swift b/Tests/ConfigurationTests/ConfigProvider+OperatorTests.swift
index c03e2cc..8e5c223 100644
--- a/Tests/ConfigurationTests/ConfigProvider+OperatorTests.swift
+++ b/Tests/ConfigurationTests/ConfigProvider+OperatorTests.swift
@@ -17,6 +17,7 @@ import ConfigurationTestingInternal
 @testable import Configuration
 
 struct ConfigProviderOperatorTests {
+    @available(Configuration 1.0, *)
     @Test func prefixWithConfigKey() throws {
         let prefixed = InMemoryProvider(values: [["app", "foo"]: "bar"]).prefixKeys(with: ["app"])
         let result = try prefixed.value(forKey: ["foo"], type: .string)
@@ -24,6 +25,7 @@ struct ConfigProviderOperatorTests {
         #expect(result.encodedKey == "app.foo")
     }
 
+    @available(Configuration 1.0, *)
     @Test func prefixWithString() throws {
         let prefixed = InMemoryProvider(values: [["app", "prod", "foo"]: "bar"]).prefixKeys(with: "app.prod")
         let result = try prefixed.value(forKey: ["foo"], type: .string)
@@ -31,6 +33,7 @@ struct ConfigProviderOperatorTests {
         #expect(result.encodedKey == "app.prod.foo")
     }
 
+    @available(Configuration 1.0, *)
     @Test func mapKeys() throws {
         let mapped = InMemoryProvider(values: [["foo"]: "bar"])
             .mapKeys { key in
diff --git a/Tests/ConfigurationTests/ConfigReaderTests/ConfigReaderMethodTestsFetch1.swift b/Tests/ConfigurationTests/ConfigReaderTests/ConfigReaderMethodTestsFetch1.swift
index 6299f6c..ba6a19c 100644
--- a/Tests/ConfigurationTests/ConfigReaderTests/ConfigReaderMethodTestsFetch1.swift
+++ b/Tests/ConfigurationTests/ConfigReaderTests/ConfigReaderMethodTestsFetch1.swift
@@ -28,6 +28,7 @@ struct ConfigReaderMethodTestsFetch1 {
     typealias TestEnum = ConfigReaderTests.TestEnum
     typealias TestStringConvertible = ConfigReaderTests.TestStringConvertible
 
+    @available(Configuration 1.0, *)
     @Test func fetch() async throws {
         let config = ConfigReaderTests.config
 
diff --git a/Tests/ConfigurationTests/ConfigReaderTests/ConfigReaderMethodTestsFetch1.swift.gyb b/Tests/ConfigurationTests/ConfigReaderTests/ConfigReaderMethodTestsFetch1.swift.gyb
index 53ac6fc..2a94889 100644
--- a/Tests/ConfigurationTests/ConfigReaderTests/ConfigReaderMethodTestsFetch1.swift.gyb
+++ b/Tests/ConfigurationTests/ConfigReaderTests/ConfigReaderMethodTestsFetch1.swift.gyb
@@ -26,6 +26,7 @@ struct ConfigReaderMethodTestsFetch1 {
     typealias TestEnum = ConfigReaderTests.TestEnum
     typealias TestStringConvertible = ConfigReaderTests.TestStringConvertible
 
+    @available(Configuration 1.0, *)
     @Test func fetch() async throws {
         let config = ConfigReaderTests.config
         
diff --git a/Tests/ConfigurationTests/ConfigReaderTests/ConfigReaderMethodTestsFetch2.swift b/Tests/ConfigurationTests/ConfigReaderTests/ConfigReaderMethodTestsFetch2.swift
index 8186500..771eed2 100644
--- a/Tests/ConfigurationTests/ConfigReaderTests/ConfigReaderMethodTestsFetch2.swift
+++ b/Tests/ConfigurationTests/ConfigReaderTests/ConfigReaderMethodTestsFetch2.swift
@@ -28,6 +28,7 @@ struct ConfigReaderMethodTestsFetch2 {
     typealias TestEnum = ConfigReaderTests.TestEnum
     typealias TestStringConvertible = ConfigReaderTests.TestStringConvertible
 
+    @available(Configuration 1.0, *)
     @Test func fetch() async throws {
         let config = ConfigReaderTests.config
 
diff --git a/Tests/ConfigurationTests/ConfigReaderTests/ConfigReaderMethodTestsFetch2.swift.gyb b/Tests/ConfigurationTests/ConfigReaderTests/ConfigReaderMethodTestsFetch2.swift.gyb
index 8736c53..2fd0b07 100644
--- a/Tests/ConfigurationTests/ConfigReaderTests/ConfigReaderMethodTestsFetch2.swift.gyb
+++ b/Tests/ConfigurationTests/ConfigReaderTests/ConfigReaderMethodTestsFetch2.swift.gyb
@@ -26,6 +26,7 @@ struct ConfigReaderMethodTestsFetch2 {
     typealias TestEnum = ConfigReaderTests.TestEnum
     typealias TestStringConvertible = ConfigReaderTests.TestStringConvertible
 
+    @available(Configuration 1.0, *)
     @Test func fetch() async throws {
         let config = ConfigReaderTests.config
         
diff --git a/Tests/ConfigurationTests/ConfigReaderTests/ConfigReaderMethodTestsFetch3.swift b/Tests/ConfigurationTests/ConfigReaderTests/ConfigReaderMethodTestsFetch3.swift
index 7da8001..e87014f 100644
--- a/Tests/ConfigurationTests/ConfigReaderTests/ConfigReaderMethodTestsFetch3.swift
+++ b/Tests/ConfigurationTests/ConfigReaderTests/ConfigReaderMethodTestsFetch3.swift
@@ -28,6 +28,7 @@ struct ConfigReaderMethodTestsFetch3 {
     typealias TestEnum = ConfigReaderTests.TestEnum
     typealias TestStringConvertible = ConfigReaderTests.TestStringConvertible
 
+    @available(Configuration 1.0, *)
     @Test func fetch() async throws {
         let config = ConfigReaderTests.config
 
diff --git a/Tests/ConfigurationTests/ConfigReaderTests/ConfigReaderMethodTestsFetch3.swift.gyb b/Tests/ConfigurationTests/ConfigReaderTests/ConfigReaderMethodTestsFetch3.swift.gyb
index 9219e7d..0223ad6 100644
--- a/Tests/ConfigurationTests/ConfigReaderTests/ConfigReaderMethodTestsFetch3.swift.gyb
+++ b/Tests/ConfigurationTests/ConfigReaderTests/ConfigReaderMethodTestsFetch3.swift.gyb
@@ -26,6 +26,7 @@ struct ConfigReaderMethodTestsFetch3 {
     typealias TestEnum = ConfigReaderTests.TestEnum
     typealias TestStringConvertible = ConfigReaderTests.TestStringConvertible
 
+    @available(Configuration 1.0, *)
     @Test func fetch() async throws {
         let config = ConfigReaderTests.config
         
diff --git a/Tests/ConfigurationTests/ConfigReaderTests/ConfigReaderMethodTestsGet1.swift b/Tests/ConfigurationTests/ConfigReaderTests/ConfigReaderMethodTestsGet1.swift
index 6acdcef..eb7bdbb 100644
--- a/Tests/ConfigurationTests/ConfigReaderTests/ConfigReaderMethodTestsGet1.swift
+++ b/Tests/ConfigurationTests/ConfigReaderTests/ConfigReaderMethodTestsGet1.swift
@@ -28,6 +28,7 @@ struct ConfigReaderMethodTestsGet1 {
     typealias TestEnum = ConfigReaderTests.TestEnum
     typealias TestStringConvertible = ConfigReaderTests.TestStringConvertible
 
+    @available(Configuration 1.0, *)
     @Test func get() async throws {
         let config = ConfigReaderTests.config
 
diff --git a/Tests/ConfigurationTests/ConfigReaderTests/ConfigReaderMethodTestsGet1.swift.gyb b/Tests/ConfigurationTests/ConfigReaderTests/ConfigReaderMethodTestsGet1.swift.gyb
index 89bc156..97c0818 100644
--- a/Tests/ConfigurationTests/ConfigReaderTests/ConfigReaderMethodTestsGet1.swift.gyb
+++ b/Tests/ConfigurationTests/ConfigReaderTests/ConfigReaderMethodTestsGet1.swift.gyb
@@ -26,6 +26,7 @@ struct ConfigReaderMethodTestsGet1 {
     typealias TestEnum = ConfigReaderTests.TestEnum
     typealias TestStringConvertible = ConfigReaderTests.TestStringConvertible
 
+    @available(Configuration 1.0, *)
     @Test func get() async throws {
         let config = ConfigReaderTests.config
         
diff --git a/Tests/ConfigurationTests/ConfigReaderTests/ConfigReaderMethodTestsGet2.swift b/Tests/ConfigurationTests/ConfigReaderTests/ConfigReaderMethodTestsGet2.swift
index 4be1d8a..0c4186e 100644
--- a/Tests/ConfigurationTests/ConfigReaderTests/ConfigReaderMethodTestsGet2.swift
+++ b/Tests/ConfigurationTests/ConfigReaderTests/ConfigReaderMethodTestsGet2.swift
@@ -28,6 +28,7 @@ struct ConfigReaderMethodTestsGet2 {
     typealias TestEnum = ConfigReaderTests.TestEnum
     typealias TestStringConvertible = ConfigReaderTests.TestStringConvertible
 
+    @available(Configuration 1.0, *)
     @Test func get() async throws {
         let config = ConfigReaderTests.config
 
diff --git a/Tests/ConfigurationTests/ConfigReaderTests/ConfigReaderMethodTestsGet2.swift.gyb b/Tests/ConfigurationTests/ConfigReaderTests/ConfigReaderMethodTestsGet2.swift.gyb
index 48e35c2..befe699 100644
--- a/Tests/ConfigurationTests/ConfigReaderTests/ConfigReaderMethodTestsGet2.swift.gyb
+++ b/Tests/ConfigurationTests/ConfigReaderTests/ConfigReaderMethodTestsGet2.swift.gyb
@@ -26,6 +26,7 @@ struct ConfigReaderMethodTestsGet2 {
     typealias TestEnum = ConfigReaderTests.TestEnum
     typealias TestStringConvertible = ConfigReaderTests.TestStringConvertible
 
+    @available(Configuration 1.0, *)
     @Test func get() async throws {
         let config = ConfigReaderTests.config
         
diff --git a/Tests/ConfigurationTests/ConfigReaderTests/ConfigReaderMethodTestsGet3.swift b/Tests/ConfigurationTests/ConfigReaderTests/ConfigReaderMethodTestsGet3.swift
index 0b537c3..a4b256a 100644
--- a/Tests/ConfigurationTests/ConfigReaderTests/ConfigReaderMethodTestsGet3.swift
+++ b/Tests/ConfigurationTests/ConfigReaderTests/ConfigReaderMethodTestsGet3.swift
@@ -28,6 +28,7 @@ struct ConfigReaderMethodTestsGet3 {
     typealias TestEnum = ConfigReaderTests.TestEnum
     typealias TestStringConvertible = ConfigReaderTests.TestStringConvertible
 
+    @available(Configuration 1.0, *)
     @Test func get() async throws {
         let config = ConfigReaderTests.config
 
diff --git a/Tests/ConfigurationTests/ConfigReaderTests/ConfigReaderMethodTestsGet3.swift.gyb b/Tests/ConfigurationTests/ConfigReaderTests/ConfigReaderMethodTestsGet3.swift.gyb
index 035aec9..3562580 100644
--- a/Tests/ConfigurationTests/ConfigReaderTests/ConfigReaderMethodTestsGet3.swift.gyb
+++ b/Tests/ConfigurationTests/ConfigReaderTests/ConfigReaderMethodTestsGet3.swift.gyb
@@ -26,6 +26,7 @@ struct ConfigReaderMethodTestsGet3 {
     typealias TestEnum = ConfigReaderTests.TestEnum
     typealias TestStringConvertible = ConfigReaderTests.TestStringConvertible
 
+    @available(Configuration 1.0, *)
     @Test func get() async throws {
         let config = ConfigReaderTests.config
         
diff --git a/Tests/ConfigurationTests/ConfigReaderTests/ConfigReaderMethodTestsWatch1.swift b/Tests/ConfigurationTests/ConfigReaderTests/ConfigReaderMethodTestsWatch1.swift
index 7edccaa..7f51f08 100644
--- a/Tests/ConfigurationTests/ConfigReaderTests/ConfigReaderMethodTestsWatch1.swift
+++ b/Tests/ConfigurationTests/ConfigReaderTests/ConfigReaderMethodTestsWatch1.swift
@@ -30,6 +30,7 @@ struct ConfigReaderMethodTestsWatch1 {
     typealias TestEnum = ConfigReaderTests.TestEnum
     typealias TestStringConvertible = ConfigReaderTests.TestStringConvertible
 
+    @available(Configuration 1.0, *)
     @Test func watch() async throws {
         let config = ConfigReaderTests.config
 
diff --git a/Tests/ConfigurationTests/ConfigReaderTests/ConfigReaderMethodTestsWatch1.swift.gyb b/Tests/ConfigurationTests/ConfigReaderTests/ConfigReaderMethodTestsWatch1.swift.gyb
index 72a7bf6..451cec9 100644
--- a/Tests/ConfigurationTests/ConfigReaderTests/ConfigReaderMethodTestsWatch1.swift.gyb
+++ b/Tests/ConfigurationTests/ConfigReaderTests/ConfigReaderMethodTestsWatch1.swift.gyb
@@ -27,6 +27,7 @@ struct ConfigReaderMethodTestsWatch1 {
     typealias TestEnum = ConfigReaderTests.TestEnum
     typealias TestStringConvertible = ConfigReaderTests.TestStringConvertible
 
+    @available(Configuration 1.0, *)
     @Test func watch() async throws {
         let config = ConfigReaderTests.config
         
diff --git a/Tests/ConfigurationTests/ConfigReaderTests/ConfigReaderMethodTestsWatch2.swift b/Tests/ConfigurationTests/ConfigReaderTests/ConfigReaderMethodTestsWatch2.swift
index 000f762..b0d9f67 100644
--- a/Tests/ConfigurationTests/ConfigReaderTests/ConfigReaderMethodTestsWatch2.swift
+++ b/Tests/ConfigurationTests/ConfigReaderTests/ConfigReaderMethodTestsWatch2.swift
@@ -30,6 +30,7 @@ struct ConfigReaderMethodTestsWatch2 {
     typealias TestEnum = ConfigReaderTests.TestEnum
     typealias TestStringConvertible = ConfigReaderTests.TestStringConvertible
 
+    @available(Configuration 1.0, *)
     @Test func watch() async throws {
         let config = ConfigReaderTests.config
 
diff --git a/Tests/ConfigurationTests/ConfigReaderTests/ConfigReaderMethodTestsWatch2.swift.gyb b/Tests/ConfigurationTests/ConfigReaderTests/ConfigReaderMethodTestsWatch2.swift.gyb
index 3b2f5dd..0a8b188 100644
--- a/Tests/ConfigurationTests/ConfigReaderTests/ConfigReaderMethodTestsWatch2.swift.gyb
+++ b/Tests/ConfigurationTests/ConfigReaderTests/ConfigReaderMethodTestsWatch2.swift.gyb
@@ -27,6 +27,7 @@ struct ConfigReaderMethodTestsWatch2 {
     typealias TestEnum = ConfigReaderTests.TestEnum
     typealias TestStringConvertible = ConfigReaderTests.TestStringConvertible
 
+    @available(Configuration 1.0, *)
     @Test func watch() async throws {
         let config = ConfigReaderTests.config
         
diff --git a/Tests/ConfigurationTests/ConfigReaderTests/ConfigReaderMethodTestsWatch3.swift b/Tests/ConfigurationTests/ConfigReaderTests/ConfigReaderMethodTestsWatch3.swift
index 9086f64..b493e55 100644
--- a/Tests/ConfigurationTests/ConfigReaderTests/ConfigReaderMethodTestsWatch3.swift
+++ b/Tests/ConfigurationTests/ConfigReaderTests/ConfigReaderMethodTestsWatch3.swift
@@ -30,6 +30,7 @@ struct ConfigReaderMethodTestsWatch3 {
     typealias TestEnum = ConfigReaderTests.TestEnum
     typealias TestStringConvertible = ConfigReaderTests.TestStringConvertible
 
+    @available(Configuration 1.0, *)
     @Test func watch() async throws {
         let config = ConfigReaderTests.config
 
diff --git a/Tests/ConfigurationTests/ConfigReaderTests/ConfigReaderMethodTestsWatch3.swift.gyb b/Tests/ConfigurationTests/ConfigReaderTests/ConfigReaderMethodTestsWatch3.swift.gyb
index 8cc38bf..098b92b 100644
--- a/Tests/ConfigurationTests/ConfigReaderTests/ConfigReaderMethodTestsWatch3.swift.gyb
+++ b/Tests/ConfigurationTests/ConfigReaderTests/ConfigReaderMethodTestsWatch3.swift.gyb
@@ -27,6 +27,7 @@ struct ConfigReaderMethodTestsWatch3 {
     typealias TestEnum = ConfigReaderTests.TestEnum
     typealias TestStringConvertible = ConfigReaderTests.TestStringConvertible
 
+    @available(Configuration 1.0, *)
     @Test func watch() async throws {
         let config = ConfigReaderTests.config
         
diff --git a/Tests/ConfigurationTests/ConfigReaderTests/ConfigReaderTests.swift b/Tests/ConfigurationTests/ConfigReaderTests/ConfigReaderTests.swift
index 9cdc32f..793fc88 100644
--- a/Tests/ConfigurationTests/ConfigReaderTests/ConfigReaderTests.swift
+++ b/Tests/ConfigurationTests/ConfigReaderTests/ConfigReaderTests.swift
@@ -17,12 +17,14 @@ import Testing
 import ConfigurationTestingInternal
 
 struct ConfigReaderTests {
+    @available(Configuration 1.0, *)
     @Test func create() throws {
         let config = ConfigReader(provider: InMemoryProvider(values: [:])).scoped(to: "foo")
         // This config has no providers, so every returned value will match the default.
         try #require(config.string(forKey: "bar", default: "test") == "test")
     }
 
+    @available(Configuration 1.0, *)
     @Test func scoping() throws {
         let provider = InMemoryProvider(
             name: "test",
@@ -36,6 +38,7 @@ struct ConfigReaderTests {
         #expect(scoped.string(forKey: "user-agent") == "Config/1.0 (Test)")
     }
 
+    @available(Configuration 1.0, *)
     @Test func scopingCustomDecoder() throws {
         let provider = InMemoryProvider(
             name: "test",
@@ -48,6 +51,7 @@ struct ConfigReaderTests {
         #expect(scoped.string(forKey: "client:user-agent") == "Config/1.0 (Test)")
     }
 
+    @available(Configuration 1.0, *)
     @Test func context() throws {
         let provider = InMemoryProvider(values: [
             AbsoluteConfigKey(["http", "client", "timeout"], context: ["upstream": "example1.org"]): 15.0,
@@ -116,6 +120,7 @@ struct ConfigReaderTests {
         static var otherStringConvertibleArray: [TestStringConvertible] { [.hello, .world, .hello] }
     }
 
+    @available(Configuration 1.0, *)
     static var provider: TestProvider {
         TestProvider(values: [
             "string": .success(ConfigValue(Defaults.string, isSecret: false)),
@@ -140,6 +145,7 @@ struct ConfigReaderTests {
         ])
     }
 
+    @available(Configuration 1.0, *)
     static var config: ConfigReader {
         ConfigReader(provider: provider)
     }
diff --git a/Tests/ConfigurationTests/ConfigReaderTests/ConfigSnapshotReaderMethodTestsGet1.swift b/Tests/ConfigurationTests/ConfigReaderTests/ConfigSnapshotReaderMethodTestsGet1.swift
index fdb072f..a2cb8ec 100644
--- a/Tests/ConfigurationTests/ConfigReaderTests/ConfigSnapshotReaderMethodTestsGet1.swift
+++ b/Tests/ConfigurationTests/ConfigReaderTests/ConfigSnapshotReaderMethodTestsGet1.swift
@@ -28,6 +28,7 @@ struct ConfigSnapshotReaderMethodTestsGet1 {
     typealias TestEnum = ConfigReaderTests.TestEnum
     typealias TestStringConvertible = ConfigReaderTests.TestStringConvertible
 
+    @available(Configuration 1.0, *)
     @Test func get() async throws {
         let config = ConfigReaderTests.config
 
diff --git a/Tests/ConfigurationTests/ConfigReaderTests/ConfigSnapshotReaderMethodTestsGet1.swift.gyb b/Tests/ConfigurationTests/ConfigReaderTests/ConfigSnapshotReaderMethodTestsGet1.swift.gyb
index b407142..f2aa635 100644
--- a/Tests/ConfigurationTests/ConfigReaderTests/ConfigSnapshotReaderMethodTestsGet1.swift.gyb
+++ b/Tests/ConfigurationTests/ConfigReaderTests/ConfigSnapshotReaderMethodTestsGet1.swift.gyb
@@ -27,6 +27,7 @@ struct ConfigSnapshotReaderMethodTestsGet1 {
     typealias TestEnum = ConfigReaderTests.TestEnum
     typealias TestStringConvertible = ConfigReaderTests.TestStringConvertible
 
+    @available(Configuration 1.0, *)
     @Test func get() async throws {
         let config = ConfigReaderTests.config
 
diff --git a/Tests/ConfigurationTests/ConfigReaderTests/ConfigSnapshotReaderMethodTestsGet2.swift b/Tests/ConfigurationTests/ConfigReaderTests/ConfigSnapshotReaderMethodTestsGet2.swift
index 890dfee..0bfd04b 100644
--- a/Tests/ConfigurationTests/ConfigReaderTests/ConfigSnapshotReaderMethodTestsGet2.swift
+++ b/Tests/ConfigurationTests/ConfigReaderTests/ConfigSnapshotReaderMethodTestsGet2.swift
@@ -28,6 +28,7 @@ struct ConfigSnapshotReaderMethodTestsGet2 {
     typealias TestEnum = ConfigReaderTests.TestEnum
     typealias TestStringConvertible = ConfigReaderTests.TestStringConvertible
 
+    @available(Configuration 1.0, *)
     @Test func get() async throws {
         let config = ConfigReaderTests.config
 
diff --git a/Tests/ConfigurationTests/ConfigReaderTests/ConfigSnapshotReaderMethodTestsGet2.swift.gyb b/Tests/ConfigurationTests/ConfigReaderTests/ConfigSnapshotReaderMethodTestsGet2.swift.gyb
index ea9a160..006c34d 100644
--- a/Tests/ConfigurationTests/ConfigReaderTests/ConfigSnapshotReaderMethodTestsGet2.swift.gyb
+++ b/Tests/ConfigurationTests/ConfigReaderTests/ConfigSnapshotReaderMethodTestsGet2.swift.gyb
@@ -27,6 +27,7 @@ struct ConfigSnapshotReaderMethodTestsGet2 {
     typealias TestEnum = ConfigReaderTests.TestEnum
     typealias TestStringConvertible = ConfigReaderTests.TestStringConvertible
 
+    @available(Configuration 1.0, *)
     @Test func get() async throws {
         let config = ConfigReaderTests.config
 
diff --git a/Tests/ConfigurationTests/ConfigReaderTests/ConfigSnapshotReaderMethodTestsGet3.swift b/Tests/ConfigurationTests/ConfigReaderTests/ConfigSnapshotReaderMethodTestsGet3.swift
index dfb3a38..b0db196 100644
--- a/Tests/ConfigurationTests/ConfigReaderTests/ConfigSnapshotReaderMethodTestsGet3.swift
+++ b/Tests/ConfigurationTests/ConfigReaderTests/ConfigSnapshotReaderMethodTestsGet3.swift
@@ -28,6 +28,7 @@ struct ConfigSnapshotReaderMethodTestsGet3 {
     typealias TestEnum = ConfigReaderTests.TestEnum
     typealias TestStringConvertible = ConfigReaderTests.TestStringConvertible
 
+    @available(Configuration 1.0, *)
     @Test func get() async throws {
         let config = ConfigReaderTests.config
 
diff --git a/Tests/ConfigurationTests/ConfigReaderTests/ConfigSnapshotReaderMethodTestsGet3.swift.gyb b/Tests/ConfigurationTests/ConfigReaderTests/ConfigSnapshotReaderMethodTestsGet3.swift.gyb
index 9044b34..2005661 100644
--- a/Tests/ConfigurationTests/ConfigReaderTests/ConfigSnapshotReaderMethodTestsGet3.swift.gyb
+++ b/Tests/ConfigurationTests/ConfigReaderTests/ConfigSnapshotReaderMethodTestsGet3.swift.gyb
@@ -27,6 +27,7 @@ struct ConfigSnapshotReaderMethodTestsGet3 {
     typealias TestEnum = ConfigReaderTests.TestEnum
     typealias TestStringConvertible = ConfigReaderTests.TestStringConvertible
 
+    @available(Configuration 1.0, *)
     @Test func get() async throws {
         let config = ConfigReaderTests.config
 
diff --git a/Tests/ConfigurationTests/ConfigSnapshotReaderTests.swift b/Tests/ConfigurationTests/ConfigSnapshotReaderTests.swift
index e43161b..e4e30c8 100644
--- a/Tests/ConfigurationTests/ConfigSnapshotReaderTests.swift
+++ b/Tests/ConfigurationTests/ConfigSnapshotReaderTests.swift
@@ -18,6 +18,7 @@ import ConfigurationTestingInternal
 
 struct ConfigSnapshotReaderTests {
 
+    @available(Configuration 1.0, *)
     @Test func get() throws {
         let provider = InMemoryProvider(
             name: "test",
@@ -32,6 +33,7 @@ struct ConfigSnapshotReaderTests {
         }
     }
 
+    @available(Configuration 1.0, *)
     @Test func watch() async throws {
         let provider = InMemoryProvider(
             name: "test",
@@ -49,6 +51,7 @@ struct ConfigSnapshotReaderTests {
         }
     }
 
+    @available(Configuration 1.0, *)
     @Test func scoping() throws {
         let provider = InMemoryProvider(
             name: "test",
@@ -64,6 +67,7 @@ struct ConfigSnapshotReaderTests {
         }
     }
 
+    @available(Configuration 1.0, *)
     @Test func scopingCustomDecoder() throws {
         let provider = InMemoryProvider(
             name: "test",
diff --git a/Tests/ConfigurationTests/DirectoryFilesProviderTests.swift b/Tests/ConfigurationTests/DirectoryFilesProviderTests.swift
index 87df7b1..7ba2270 100644
--- a/Tests/ConfigurationTests/DirectoryFilesProviderTests.swift
+++ b/Tests/ConfigurationTests/DirectoryFilesProviderTests.swift
@@ -22,6 +22,7 @@ import SystemPackage
 struct DirectoryFilesProviderTests {
 
     /// Creates test files for the provider.
+    @available(Configuration 1.0, *)
     static var testFiles: [FilePath: InMemoryFileSystem.FileInfo] {
         let stringValues: [String: String] = [
             "string": "Hello",
@@ -59,6 +60,7 @@ struct DirectoryFilesProviderTests {
         return Dictionary(uniqueKeysWithValues: tuples)
     }
 
+    @available(Configuration 1.0, *)
     @Test func printingDescription() async throws {
         let fileSystem = InMemoryFileSystem(files: Self.testFiles)
         let provider = try await DirectoryFilesProvider(
@@ -69,6 +71,7 @@ struct DirectoryFilesProviderTests {
         #expect(provider.description == "DirectoryFilesProvider[21 files]")
     }
 
+    @available(Configuration 1.0, *)
     @Test func printingDebugDescription() async throws {
         let fileSystem = InMemoryFileSystem(files: Self.testFiles)
         let provider = try await DirectoryFilesProvider(
@@ -83,6 +86,7 @@ struct DirectoryFilesProviderTests {
         #expect(provider.debugDescription == expectedDebugDescription)
     }
 
+    @available(Configuration 1.0, *)
     @Test func compat() async throws {
         let fileSystem = InMemoryFileSystem(files: Self.testFiles)
         let provider = try await DirectoryFilesProvider(
diff --git a/Tests/ConfigurationTests/EnvironmentVariablesProviderTests.swift b/Tests/ConfigurationTests/EnvironmentVariablesProviderTests.swift
index f24ada0..e5b08c1 100644
--- a/Tests/ConfigurationTests/EnvironmentVariablesProviderTests.swift
+++ b/Tests/ConfigurationTests/EnvironmentVariablesProviderTests.swift
@@ -20,9 +20,10 @@ import ConfigurationTesting
 import SystemPackage
 
 struct EnvironmentVariablesProviderTests {
-    let provider: EnvironmentVariablesProvider
-    init() {
-        provider = EnvironmentVariablesProvider(
+
+    @available(Configuration 1.0, *)
+    var provider: EnvironmentVariablesProvider {
+        EnvironmentVariablesProvider(
             environmentVariables: [
                 "STRING": "Hello",
                 "OTHER_STRING": "Other Hello",
@@ -51,6 +52,7 @@ struct EnvironmentVariablesProviderTests {
         )
     }
 
+    @available(Configuration 1.0, *)
     @Test func printingDescription() throws {
         let expectedDescription = #"""
             EnvironmentVariablesProvider[20 values]
@@ -58,6 +60,7 @@ struct EnvironmentVariablesProviderTests {
         #expect(provider.description == expectedDescription)
     }
 
+    @available(Configuration 1.0, *)
     @Test func printingDebugDescription() throws {
         let expectedDebugDescription = #"""
             EnvironmentVariablesProvider[20 values: BOOL=true, BOOLY_ARRAY=true,false, BYTES=bWFnaWM=, BYTE_CHUNKY_ARRAY=bWFnaWM=,bWFnaWMy, DOUBLE=3.14, DOUBLY_ARRAY=3.14,2.72, INT=42, INTY_ARRAY=42,24, OTHER_BOOL=false, OTHER_BOOLY_ARRAY=false,true,true, OTHER_BYTES=bWFnaWMy, OTHER_BYTE_CHUNKY_ARRAY=bWFnaWM=,bWFnaWMy,bWFnaWM=, OTHER_DOUBLE=2.72, OTHER_DOUBLY_ARRAY=0.9,1.8, OTHER_INT=24, OTHER_INTY_ARRAY=16,32, OTHER_STRING=Other Hello, OTHER_STRINGY_ARRAY=Hello,Swift, STRING=<REDACTED>, STRINGY_ARRAY=Hello,World]
@@ -65,15 +68,18 @@ struct EnvironmentVariablesProviderTests {
         #expect(provider.debugDescription == expectedDebugDescription)
     }
 
+    @available(Configuration 1.0, *)
     @Test func compat() async throws {
         try await ProviderCompatTest(provider: provider).run()
     }
 
+    @available(Configuration 1.0, *)
     @Test func secretSpecifier() throws {
         #expect(try provider.value(forKey: ["string"], type: .string).value?.isSecret == true)
         #expect(try provider.value(forKey: ["other.string"], type: .string).value?.isSecret == false)
     }
 
+    @available(Configuration 1.0, *)
     @Test func parseEnvironmentFile() throws {
         let values = EnvironmentFileParser.parsed(
             #"""
@@ -102,6 +108,7 @@ struct EnvironmentVariablesProviderTests {
         #expect(values == expected)
     }
 
+    @available(Configuration 1.0, *)
     @Test func loadEnvironmentFile() async throws {
         let envFilePath = try #require(Bundle.module.path(forResource: "Resources", ofType: nil)?.appending("/.env"))
         let provider = try await EnvironmentVariablesProvider(
@@ -115,6 +122,7 @@ struct EnvironmentVariablesProviderTests {
         #expect(config.string(forKey: "http.secret") == "s3cret")
     }
 
+    @available(Configuration 1.0, *)
     @Test func loadEnvironmentFileError() async throws {
         let envFilePath: FilePath = "/tmp/definitelyNotAnEnvFile"
         do {
@@ -137,6 +145,7 @@ struct EnvironmentVariablesProviderTests {
 
 struct EnvironmentKeyEncoderTests {
 
+    @available(Configuration 1.0, *)
     @Test func test() {
         let encoder = EnvironmentKeyEncoder()
 
diff --git a/Tests/ConfigurationTests/FileAccessLoggerTests.swift b/Tests/ConfigurationTests/FileAccessLoggerTests.swift
index c9b479c..b3e6828 100644
--- a/Tests/ConfigurationTests/FileAccessLoggerTests.swift
+++ b/Tests/ConfigurationTests/FileAccessLoggerTests.swift
@@ -19,6 +19,7 @@ import SystemPackage
 import ConfigurationTestingInternal
 
 struct FileAccessLoggerTests {
+    @available(Configuration 1.0, *)
     @Test func test() throws {
 
         let readString: String
diff --git a/Tests/ConfigurationTests/InMemoryProviderTests.swift b/Tests/ConfigurationTests/InMemoryProviderTests.swift
index 345d54a..8c6524a 100644
--- a/Tests/ConfigurationTests/InMemoryProviderTests.swift
+++ b/Tests/ConfigurationTests/InMemoryProviderTests.swift
@@ -19,9 +19,10 @@ import Foundation
 import ConfigurationTesting
 
 struct InMemoryProviderTests {
-    let provider: InMemoryProvider
-    init() {
-        provider = InMemoryProvider(
+
+    @available(Configuration 1.0, *)
+    var provider: InMemoryProvider {
+        InMemoryProvider(
             name: "test",
             values: [
                 "string": .init("Hello", isSecret: false),
@@ -48,6 +49,7 @@ struct InMemoryProviderTests {
         )
     }
 
+    @available(Configuration 1.0, *)
     @Test func printingDescription() throws {
         let expectedDescription = #"""
             InMemoryProvider[test, 20 values]
@@ -55,6 +57,7 @@ struct InMemoryProviderTests {
         #expect(provider.description == expectedDescription)
     }
 
+    @available(Configuration 1.0, *)
     @Test func printingDebugDescription() throws {
         let expectedDebugDescription = #"""
             InMemoryProvider[test, 20 values: bool=[bool: true], booly.array=[boolArray: true, false], byteChunky.array=[byteChunkArray: 5 bytes, prefix: 6d61676963, 6 bytes, prefix: 6d6167696332], bytes=[bytes: 5 bytes, prefix: 6d61676963], double=[double: 3.14], doubly.array=[doubleArray: 3.14, 2.72], int=[int: 42], inty.array=[intArray: 42, 24], other.bool=[bool: false], other.booly.array=[boolArray: false, true, true], other.byteChunky.array=[byteChunkArray: 5 bytes, prefix: 6d61676963, 6 bytes, prefix: 6d6167696332, 5 bytes, prefix: 6d61676963], other.bytes=[bytes: 6 bytes, prefix: 6d6167696332], other.double=[double: 2.72], other.doubly.array=[doubleArray: 0.9, 1.8], other.int=[int: 24], other.inty.array=[intArray: 16, 32], other.string=[string: Other Hello], other.stringy.array=[stringArray: Hello, Swift], string=[string: Hello], stringy.array=[stringArray: Hello, World]]
@@ -62,6 +65,7 @@ struct InMemoryProviderTests {
         #expect(provider.debugDescription == expectedDebugDescription)
     }
 
+    @available(Configuration 1.0, *)
     @Test func compat() async throws {
         try await ProviderCompatTest(provider: provider).run()
     }
diff --git a/Tests/ConfigurationTests/JSONProviderTests.swift b/Tests/ConfigurationTests/JSONProviderTests.swift
index 539265e..211b301 100644
--- a/Tests/ConfigurationTests/JSONProviderTests.swift
+++ b/Tests/ConfigurationTests/JSONProviderTests.swift
@@ -23,25 +23,31 @@ private let resourcesPath = FilePath(try! #require(Bundle.module.path(forResourc
 let jsonConfigFile = resourcesPath.appending("/config.json")
 
 struct JSONProviderTests {
-    let provider: JSONProvider
-    init() async throws {
-        provider = try await JSONProvider(filePath: jsonConfigFile)
+
+    @available(Configuration 1.0, *)
+    var provider: JSONProvider {
+        get async throws {
+            try await JSONProvider(filePath: jsonConfigFile)
+        }
     }
 
-    @Test func printingDescription() throws {
+    @available(Configuration 1.0, *)
+    @Test func printingDescription() async throws {
         let expectedDescription = #"""
             JSONProvider[20 values]
             """#
-        #expect(provider.description == expectedDescription)
+        try await #expect(provider.description == expectedDescription)
     }
 
-    @Test func printingDebugDescription() throws {
+    @available(Configuration 1.0, *)
+    @Test func printingDebugDescription() async throws {
         let expectedDebugDescription = #"""
             JSONProvider[20 values: bool=1, booly.array=1,0, byteChunky.array=bWFnaWM=,bWFnaWMy, bytes=bWFnaWM=, double=3.14, doubly.array=3.14,2.72, int=42, inty.array=42,24, other.bool=0, other.booly.array=0,1,1, other.byteChunky.array=bWFnaWM=,bWFnaWMy,bWFnaWM=, other.bytes=bWFnaWMy, other.double=2.72, other.doubly.array=0.9,1.8, other.int=24, other.inty.array=16,32, other.string=Other Hello, other.stringy.array=Hello,Swift, string=Hello, stringy.array=Hello,World]
             """#
-        #expect(provider.debugDescription == expectedDebugDescription)
+        try await #expect(provider.debugDescription == expectedDebugDescription)
     }
 
+    @available(Configuration 1.0, *)
     @Test func compat() async throws {
         try await ProviderCompatTest(provider: provider).run()
     }
diff --git a/Tests/ConfigurationTests/KeyMappingProviderTests.swift b/Tests/ConfigurationTests/KeyMappingProviderTests.swift
index 4e1837f..d721497 100644
--- a/Tests/ConfigurationTests/KeyMappingProviderTests.swift
+++ b/Tests/ConfigurationTests/KeyMappingProviderTests.swift
@@ -20,6 +20,7 @@ import ConfigurationTesting
 
 struct KeyMappingProviderTests {
 
+    @available(Configuration 1.0, *)
     @Test func getValueWithMappedKey() throws {
         let upstream = InMemoryProvider(values: ["app.foo": "bar", "app.bar": "baz"])
         let mapper = KeyMappingProvider(upstream: upstream) { key in
@@ -40,6 +41,7 @@ struct KeyMappingProviderTests {
         #expect(barResult.encodedKey == "app.bar")
     }
 
+    @available(Configuration 1.0, *)
     @Test func fetchValueWithMappedKey() async throws {
         let upstream = InMemoryProvider(values: ["app.foo": "bar", "app.bar": "baz"])
         let mapper = KeyMappingProvider(upstream: upstream) { key in
@@ -56,6 +58,7 @@ struct KeyMappingProviderTests {
         #expect(fooResult.encodedKey == "app.foo")
     }
 
+    @available(Configuration 1.0, *)
     @Test func watchValueWithMappedKey() async throws {
         let upstream = InMemoryProvider(values: ["app.foo": "bar", "app.bar": "baz"])
         let mapper = KeyMappingProvider(upstream: upstream) { key in
@@ -80,6 +83,7 @@ struct KeyMappingProviderTests {
         #expect(result.encodedKey == "app.foo")
     }
 
+    @available(Configuration 1.0, *)
     @Test func snapshotWithMappedKey() throws {
         let upstream = InMemoryProvider(values: ["app.foo": "bar", "app.bar": "baz"])
         let mapper = KeyMappingProvider(upstream: upstream) { key in
@@ -101,6 +105,7 @@ struct KeyMappingProviderTests {
         #expect(otherResult.encodedKey == "other")
     }
 
+    @available(Configuration 1.0, *)
     @Test func watchSnapshotWithMappedPrefix() async throws {
         let upstream = InMemoryProvider(values: ["app.foo": "bar", "app.bar": "baz"])
         let mapper = KeyMappingProvider(upstream: upstream) { key in
@@ -126,6 +131,7 @@ struct KeyMappingProviderTests {
         #expect(result.encodedKey == "app.foo")
     }
 
+    @available(Configuration 1.0, *)
     @Test func providerName() {
         let upstream = InMemoryProvider(name: "test-upstream", values: [:])
         let mapper = KeyMappingProvider(upstream: upstream) { key in key }
@@ -133,6 +139,7 @@ struct KeyMappingProviderTests {
         #expect(mapper.providerName == expectedName)
     }
 
+    @available(Configuration 1.0, *)
     @Test func description() {
         let upstream = InMemoryProvider(name: "test-upstream", values: [:])
         let mapper = KeyMappingProvider(upstream: upstream) { key in key }
@@ -141,6 +148,7 @@ struct KeyMappingProviderTests {
         #expect(mapper.description == expectedDescription)
     }
 
+    @available(Configuration 1.0, *)
     @Test func compat() async throws {
         let upstream = InMemoryProvider(
             name: "test",
diff --git a/Tests/ConfigurationTests/MultiProviderTests.swift b/Tests/ConfigurationTests/MultiProviderTests.swift
index 505711f..3e4344c 100644
--- a/Tests/ConfigurationTests/MultiProviderTests.swift
+++ b/Tests/ConfigurationTests/MultiProviderTests.swift
@@ -19,8 +19,9 @@ import ConfigurationTestingInternal
 import ConfigurationTesting
 
 struct MultiProviderTests {
-    let providers: [any ConfigProvider]
-    init() {
+
+    @available(Configuration 1.0, *)
+    var providers: [any ConfigProvider] {
         let first = InMemoryProvider(
             name: "first",
             values: [
@@ -51,7 +52,7 @@ struct MultiProviderTests {
                 "other.byteChunky.array": .init([.magic, .magic2, .magic], isSecret: false),
             ]
         )
-        providers = [
+        return [
             first,
             second,
         ]
@@ -62,6 +63,7 @@ struct MultiProviderTests {
     /// This is not a generally useful wrapper - the multi provider is an internal implementation detail.
     ///
     /// Here in tests, it's just helpful to be able to run ProviderCompatTests on it.
+    @available(Configuration 1.0, *)
     struct MultiProviderTestShims: ConfigProvider {
 
         /// The underlying multi provider.
@@ -123,11 +125,13 @@ struct MultiProviderTests {
         }
     }
 
+    @available(Configuration 1.0, *)
     @Test func compat() async throws {
         let multiProvider = MultiProvider(providers: providers)
         try await ProviderCompatTest(provider: MultiProviderTestShims(multiProvider: multiProvider)).run()
     }
 
+    @available(Configuration 1.0, *)
     @Test func watchingTwoUpstreams() async throws {
         let first = MutableInMemoryProvider(
             name: "first",
@@ -172,6 +176,7 @@ struct MultiProviderTests {
     }
 }
 
+@available(Configuration 1.0, *)
 extension MultiSnapshot: ConfigSnapshotProtocol {
     var providerName: String {
         "MultiProvider"
diff --git a/Tests/ConfigurationTests/MutableInMemoryProviderTests.swift b/Tests/ConfigurationTests/MutableInMemoryProviderTests.swift
index 6a84485..7a40955 100644
--- a/Tests/ConfigurationTests/MutableInMemoryProviderTests.swift
+++ b/Tests/ConfigurationTests/MutableInMemoryProviderTests.swift
@@ -18,9 +18,10 @@ import ConfigurationTestingInternal
 import ConfigurationTesting
 
 struct MutableInMemoryProviderTests {
-    let provider: MutableInMemoryProvider
-    init() {
-        provider = MutableInMemoryProvider(
+
+    @available(Configuration 1.0, *)
+    func makeProvider() -> MutableInMemoryProvider {
+        MutableInMemoryProvider(
             name: "test",
             initialValues: [
                 "string": .init("Hello", isSecret: false),
@@ -47,25 +48,33 @@ struct MutableInMemoryProviderTests {
         )
     }
 
+    @available(Configuration 1.0, *)
     @Test func printingDescription() throws {
         let expectedDescription = #"""
             MutableInMemoryProvider[test, 0 watchers, 20 values]
             """#
+        let provider = makeProvider()
         #expect(provider.description == expectedDescription)
     }
 
+    @available(Configuration 1.0, *)
     @Test func printingDebugDescription() throws {
         let expectedDebugDescription = #"""
             MutableInMemoryProvider[test, 0 watchers, 20 values: bool=[bool: true], booly.array=[boolArray: true, false], byteChunky.array=[byteChunkArray: 5 bytes, prefix: 6d61676963, 6 bytes, prefix: 6d6167696332], bytes=[bytes: 5 bytes, prefix: 6d61676963], double=[double: 3.14], doubly.array=[doubleArray: 3.14, 2.72], int=[int: 42], inty.array=[intArray: 42, 24], other.bool=[bool: false], other.booly.array=[boolArray: false, true, true], other.byteChunky.array=[byteChunkArray: 5 bytes, prefix: 6d61676963, 6 bytes, prefix: 6d6167696332, 5 bytes, prefix: 6d61676963], other.bytes=[bytes: 6 bytes, prefix: 6d6167696332], other.double=[double: 2.72], other.doubly.array=[doubleArray: 0.9, 1.8], other.int=[int: 24], other.inty.array=[intArray: 16, 32], other.string=[string: Other Hello], other.stringy.array=[stringArray: Hello, Swift], string=[string: Hello], stringy.array=[stringArray: Hello, World]]
             """#
+        let provider = makeProvider()
         #expect(provider.debugDescription == expectedDebugDescription)
     }
 
+    @available(Configuration 1.0, *)
     @Test func compat() async throws {
+        let provider = makeProvider()
         try await ProviderCompatTest(provider: provider).run()
     }
 
+    @available(Configuration 1.0, *)
     @Test func mutatingGet() throws {
+        let provider = makeProvider()
         let config = ConfigReader(provider: provider)
 
         #expect(config.bool(forKey: "bool") == true)
@@ -73,7 +82,9 @@ struct MutableInMemoryProviderTests {
         #expect(config.bool(forKey: "bool") == false)
     }
 
+    @available(Configuration 1.0, *)
     @Test func mutatingFetch() async throws {
+        let provider = makeProvider()
         let config = ConfigReader(provider: provider)
 
         try await #expect(config.fetchBool(forKey: "bool") == true)
@@ -81,7 +92,9 @@ struct MutableInMemoryProviderTests {
         try await #expect(config.fetchBool(forKey: "bool") == false)
     }
 
+    @available(Configuration 1.0, *)
     @Test func mutatingWatch() async throws {
+        let provider = makeProvider()
         let config = ConfigReader(provider: provider)
 
         #expect(
@@ -114,7 +127,9 @@ struct MutableInMemoryProviderTests {
         }
     }
 
+    @available(Configuration 1.0, *)
     @Test func mutatingGetSnapshot() throws {
+        let provider = makeProvider()
         let config = ConfigReader(provider: provider)
 
         config.withSnapshot { snapshot in
@@ -125,7 +140,9 @@ struct MutableInMemoryProviderTests {
         #expect(config.bool(forKey: "bool") == false)
     }
 
+    @available(Configuration 1.0, *)
     @Test func mutatingWatchSnapshot() async throws {
+        let provider = makeProvider()
         let config = ConfigReader(provider: provider)
 
         let firstValueFuture = TestFuture<Bool??>(name: "firstValue")
diff --git a/Tests/ConfigurationTests/ReloadingFileProviderCoreTests.swift b/Tests/ConfigurationTests/ReloadingFileProviderCoreTests.swift
index bc547ab..3348b10 100644
--- a/Tests/ConfigurationTests/ReloadingFileProviderCoreTests.swift
+++ b/Tests/ConfigurationTests/ReloadingFileProviderCoreTests.swift
@@ -24,6 +24,7 @@ import ServiceLifecycle
 import Synchronization
 import SystemPackage
 
+@available(Configuration 1.0, *)
 private struct TestSnapshot: ConfigSnapshotProtocol {
     var values: [String: ConfigValue]
 
@@ -54,54 +55,58 @@ private struct TestSnapshot: ConfigSnapshotProtocol {
     }
 }
 
+@available(Configuration 1.0, *)
 extension InMemoryFileSystem.FileData {
     static func file(contents: String) -> Self {
         .file(Data(contents.utf8))
     }
 }
 
+@available(Configuration 1.0, *)
 extension InMemoryFileSystem.FileInfo {
     static func file(timestamp: Date, contents: String) -> Self {
         .init(lastModifiedTimestamp: timestamp, data: .file(contents: contents))
     }
 }
 
-struct ReloadingFileProviderCoreTests {
-    private func withTestProvider<R>(
-        body: (
-            ReloadingFileProviderCore<TestSnapshot>,
-            InMemoryFileSystem,
-            FilePath,
-            Date
-        ) async throws -> R
-    ) async throws -> R {
-        let filePath = FilePath("/test/config.txt")
-        let originalTimestamp = Date(timeIntervalSince1970: 1_750_688_537)
-        let fileSystem = InMemoryFileSystem(
-            files: [
-                filePath: .file(
-                    timestamp: originalTimestamp,
-                    contents: """
-                        key1=value1
-                        key2=value2
-                        """
-                )
-            ]
-        )
-        let core = try await ReloadingFileProviderCore<TestSnapshot>(
-            filePath: filePath,
-            pollInterval: .seconds(1),
-            providerName: "TestProvider",
-            fileSystem: fileSystem,
-            logger: .noop,
-            metrics: nil,
-            createSnapshot: { data in
-                try TestSnapshot(contents: String(decoding: data, as: UTF8.self))
-            }
-        )
-        return try await body(core, fileSystem, filePath, originalTimestamp)
-    }
+@available(Configuration 1.0, *)
+private func withTestProvider<R>(
+    body: (
+        ReloadingFileProviderCore<TestSnapshot>,
+        InMemoryFileSystem,
+        FilePath,
+        Date
+    ) async throws -> R
+) async throws -> R {
+    let filePath = FilePath("/test/config.txt")
+    let originalTimestamp = Date(timeIntervalSince1970: 1_750_688_537)
+    let fileSystem = InMemoryFileSystem(
+        files: [
+            filePath: .file(
+                timestamp: originalTimestamp,
+                contents: """
+                    key1=value1
+                    key2=value2
+                    """
+            )
+        ]
+    )
+    let core = try await ReloadingFileProviderCore<TestSnapshot>(
+        filePath: filePath,
+        pollInterval: .seconds(1),
+        providerName: "TestProvider",
+        fileSystem: fileSystem,
+        logger: .noop,
+        metrics: nil,
+        createSnapshot: { data in
+            try TestSnapshot(contents: String(decoding: data, as: UTF8.self))
+        }
+    )
+    return try await body(core, fileSystem, filePath, originalTimestamp)
+}
 
+struct CoreTests {
+    @available(Configuration 1.0, *)
     @Test func testBasicManualReload() async throws {
         try await withTestProvider { core, fileSystem, filePath, originalTimestamp in
             // Check initial values
@@ -129,6 +134,7 @@ struct ReloadingFileProviderCoreTests {
         }
     }
 
+    @available(Configuration 1.0, *)
     @Test func testBasicTimedReload() async throws {
         let filePath = FilePath("/test/config.txt")
         let originalTimestamp = Date(timeIntervalSince1970: 1_750_688_537)
@@ -190,6 +196,7 @@ struct ReloadingFileProviderCoreTests {
         }
     }
 
+    @available(Configuration 1.0, *)
     @Test func testSymlink_targetPathChanged() async throws {
         try await withTestProvider { core, fileSystem, filePath, originalTimestamp in
             let targetPath1 = FilePath("/test/config1.txt")
@@ -244,6 +251,7 @@ struct ReloadingFileProviderCoreTests {
         }
     }
 
+    @available(Configuration 1.0, *)
     @Test func testSymlink_timestampChanged() async throws {
         try await withTestProvider { core, fileSystem, filePath, originalTimestamp in
             let targetPath = FilePath("/test/config1.txt")
@@ -292,6 +300,7 @@ struct ReloadingFileProviderCoreTests {
         }
     }
 
+    @available(Configuration 1.0, *)
     @Test func testWatchValue() async throws {
         try await withTestProvider { core, fileSystem, filePath, originalTimestamp in
             let firstValueConsumed = TestFuture<Void>(name: "First value consumed")
diff --git a/Tests/ConfigurationTests/ReloadingJSONProviderTests.swift b/Tests/ConfigurationTests/ReloadingJSONProviderTests.swift
index 801abe8..0674c4d 100644
--- a/Tests/ConfigurationTests/ReloadingJSONProviderTests.swift
+++ b/Tests/ConfigurationTests/ReloadingJSONProviderTests.swift
@@ -23,6 +23,7 @@ import Logging
 import SystemPackage
 
 struct ReloadingJSONProviderTests {
+    @available(Configuration 1.0, *)
     @Test func printingDescription() async throws {
         let provider = try await ReloadingJSONProvider(filePath: jsonConfigFile)
         let expectedDescription = #"""
@@ -31,6 +32,7 @@ struct ReloadingJSONProviderTests {
         #expect(provider.description == expectedDescription)
     }
 
+    @available(Configuration 1.0, *)
     @Test func printingDebugDescription() async throws {
         let provider = try await ReloadingJSONProvider(filePath: jsonConfigFile)
         let expectedDebugDescription = #"""
@@ -39,11 +41,13 @@ struct ReloadingJSONProviderTests {
         #expect(provider.debugDescription == expectedDebugDescription)
     }
 
+    @available(Configuration 1.0, *)
     @Test func compat() async throws {
         let provider = try await ReloadingJSONProvider(filePath: jsonConfigFile)
         try await ProviderCompatTest(provider: provider).run()
     }
 
+    @available(Configuration 1.0, *)
     @Test func initializationWithConfig() async throws {
         // Test initialization using config reader
         let envProvider = InMemoryProvider(values: [
diff --git a/Tests/ConfigurationTests/ReloadingYAMLProviderTests.swift b/Tests/ConfigurationTests/ReloadingYAMLProviderTests.swift
index 70b4cb7..6371541 100644
--- a/Tests/ConfigurationTests/ReloadingYAMLProviderTests.swift
+++ b/Tests/ConfigurationTests/ReloadingYAMLProviderTests.swift
@@ -23,6 +23,7 @@ import Logging
 import SystemPackage
 
 struct ReloadingYAMLProviderTests {
+    @available(Configuration 1.0, *)
     @Test func printingDescription() async throws {
         let provider = try await ReloadingYAMLProvider(filePath: yamlConfigFile)
         let expectedDescription = #"""
@@ -31,6 +32,7 @@ struct ReloadingYAMLProviderTests {
         #expect(provider.description == expectedDescription)
     }
 
+    @available(Configuration 1.0, *)
     @Test func printingDebugDescription() async throws {
         let provider = try await ReloadingYAMLProvider(filePath: yamlConfigFile)
         let expectedDebugDescription = #"""
@@ -39,11 +41,13 @@ struct ReloadingYAMLProviderTests {
         #expect(provider.debugDescription == expectedDebugDescription)
     }
 
+    @available(Configuration 1.0, *)
     @Test func compat() async throws {
         let provider = try await ReloadingYAMLProvider(filePath: yamlConfigFile)
         try await ProviderCompatTest(provider: provider).run()
     }
 
+    @available(Configuration 1.0, *)
     @Test func initializationWithConfig() async throws {
         // Test initialization using config reader
         let envProvider = InMemoryProvider(values: [
diff --git a/Tests/ConfigurationTests/SecretMarkingTests.swift b/Tests/ConfigurationTests/SecretMarkingTests.swift
index cf3f9e2..1668552 100644
--- a/Tests/ConfigurationTests/SecretMarkingTests.swift
+++ b/Tests/ConfigurationTests/SecretMarkingTests.swift
@@ -18,6 +18,7 @@ import ConfigurationTestingInternal
 
 struct SecretMarkingTests {
 
+    @available(Configuration 1.0, *)
     @Test func secretHandling() throws {
         let provider = InMemoryProvider(values: [
             "public.key": ConfigValue("public-value", isSecret: false),
@@ -37,6 +38,7 @@ struct SecretMarkingTests {
         #expect(try events[1].result.get()?.isSecret == true)
     }
 
+    @available(Configuration 1.0, *)
     @Test func get() throws {
         let accessReporter = TestAccessReporter()
         let provider = InMemoryProvider(
@@ -81,6 +83,7 @@ struct SecretMarkingTests {
         try #expect(events[3].result.get() == ConfigValue("s3cret", isSecret: true))
     }
 
+    @available(Configuration 1.0, *)
     @Test func fetch() async throws {
         let accessReporter = TestAccessReporter()
         let provider = InMemoryProvider(
@@ -126,6 +129,7 @@ struct SecretMarkingTests {
         try #expect(events[3].result.get() == ConfigValue("s3cret", isSecret: true))
     }
 
+    @available(Configuration 1.0, *)
     @Test func watch() async throws {
         let accessReporter = TestAccessReporter()
         let provider = InMemoryProvider(
diff --git a/Tests/ConfigurationTests/SeparatorKeyEncoderTests.swift b/Tests/ConfigurationTests/SeparatorKeyEncoderTests.swift
index 08b6a63..95ad240 100644
--- a/Tests/ConfigurationTests/SeparatorKeyEncoderTests.swift
+++ b/Tests/ConfigurationTests/SeparatorKeyEncoderTests.swift
@@ -16,6 +16,7 @@ import Configuration
 import Testing
 
 struct SeparatorKeyEncoderTests {
+    @available(Configuration 1.0, *)
     @Test func dotEncoding() {
         let encoder: any ConfigKeyEncoder = .dotSeparated
         #expect(encoder.encode(.init(["foo"])) == "foo")
@@ -24,6 +25,7 @@ struct SeparatorKeyEncoderTests {
         #expect(encoder.encode(.init(["foo.bar"])) == "foo.bar")
     }
 
+    @available(Configuration 1.0, *)
     @Test func dashEncoding() {
         let encoder: any ConfigKeyEncoder = .dashSeparated
         #expect(encoder.encode(.init(["foo"])) == "foo")
diff --git a/Tests/ConfigurationTests/YAMLProviderTests.swift b/Tests/ConfigurationTests/YAMLProviderTests.swift
index dc0f9a9..7bc1abd 100644
--- a/Tests/ConfigurationTests/YAMLProviderTests.swift
+++ b/Tests/ConfigurationTests/YAMLProviderTests.swift
@@ -25,25 +25,31 @@ private let resourcesPath = FilePath(try! #require(Bundle.module.path(forResourc
 let yamlConfigFile = resourcesPath.appending("/config.yaml")
 
 struct YAMLProviderTests {
-    let provider: YAMLProvider
-    init() async throws {
-        provider = try await YAMLProvider(filePath: yamlConfigFile)
+
+    @available(Configuration 1.0, *)
+    var provider: YAMLProvider {
+        get async throws {
+            try await YAMLProvider(filePath: yamlConfigFile)
+        }
     }
 
-    @Test func printingDescription() throws {
+    @available(Configuration 1.0, *)
+    @Test func printingDescription() async throws {
         let expectedDescription = #"""
             YAMLProvider[20 values]
             """#
-        #expect(provider.description == expectedDescription)
+        try await #expect(provider.description == expectedDescription)
     }
 
-    @Test func printingDebugDescription() throws {
+    @available(Configuration 1.0, *)
+    @Test func printingDebugDescription() async throws {
         let expectedDebugDescription = #"""
             YAMLProvider[20 values: bool=true, booly.array=true,false, byteChunky.array=bWFnaWM=,bWFnaWMy, bytes=bWFnaWM=, double=3.14, doubly.array=3.14,2.72, int=42, inty.array=42,24, other.bool=false, other.booly.array=false,true,true, other.byteChunky.array=bWFnaWM=,bWFnaWMy,bWFnaWM=, other.bytes=bWFnaWMy, other.double=2.72, other.doubly.array=0.9,1.8, other.int=24, other.inty.array=16,32, other.string=Other Hello, other.stringy.array=Hello,Swift, string=Hello, stringy.array=Hello,World]
             """#
-        #expect(provider.debugDescription == expectedDebugDescription)
+        try await #expect(provider.debugDescription == expectedDebugDescription)
     }
 
+    @available(Configuration 1.0, *)
     @Test func compat() async throws {
         try await ProviderCompatTest(provider: provider).run()
     }