package:dart_mcp v0.5.0

• Initial support for protocol version 2025-11-25.
  • Added support for Icons in Implementation, Tool, Resource, ResourceTemplate, and Prompt.
  • Added support for ToolChoice in sampling CreateMessageRequest.
  • Added support for URL-based elicitations in ElicitRequest.
    • Separated ElicitationSupport into ElicitationFormSupport and
      ElicitationUrlSupport mixins, which will affect which capabilities
      your server advertises. The original ElicitationSupport mixin is now
      deprecated (and is an alias for ElicitationFormSupport).
    • Added onElicitationComplete extension getter to ElicitRequest, which
      will listen for notifications/elicitation/complete notifications.
    • If a tool call fails with the urlElicitationRequired error code, and
      the client supports URL based elicitations, the client will automatically
      handle the elicitation and retry the tool call if the elicitation
      succeeds.
  • Added an McpErrorCodes namespace for MCP error codes. For now only
    contains the urlElicitationRequired error code.
  • Added examples for URL based elicitations, including handling
    urlElicitationRequired errors.
  • Added description field to Implementation.
  • Does not add support for Tasks yet.
  • Added support for EnumSchema subtypes, matching the spec. This includes
    multi select enums and enums with titles. Validation is also supported.
  • Added Meta? meta param to ElicitRequest.
• Added ConstSchema type for constant values, with validation.
• BREAKING:
  • Change many fields of ResourceLink to be nullable, and their associated
    parameters to be optional. This brings us in line with the specification.
  • The WithElicitationHandler interface is now private and implemented by
    the ElicitationFormSupport and ElicitationUrlSupport mixins.
  • Added a required ServerConnection server parameter to the
    ElicitationSupport.handleElicitation method.
  • ElicitRequest.requestedSchema is now nullable (for url mode).
  • EnumSchema is now a union type with 4 subtypes, matching the spec changes.

package:dart_mcp v0.4.1

• Expose various private methods on MCP server mixins as public methods, with
  @mustCallSuper annotations. This allows intercepting calls for logging,
  metrics, or other purposes.
• Fix the resource parameter type on EmbeddedResource to be
  ResourceContents instead of Contents.
  • Note: This is technically breaking but the previous API would not have
    been possible to use in a functional manner, so it is assumed that it had
    no usage previously.
• Fix the type getter on EmbeddedResource to read the actual type field.
• Add toJson method to the CreateMessageResult of a sampling request.

package:dart_mcp v0.4.0

• Update the tool calling example to include progress notifications.
• Breaking: Update APIs to accept nullable parameters when the parameters
  are not required for that method. This is only breaking if you override these
  methods.

package:dart_mcp v0.3.3

• Fix PingRequest handling when it is sent from a non-Dart client.
• Deprecate ElicitationAction.reject and replace it with
  ElicitationAction.decline.
  • In the initial elicitations schema this was incorrectly listed as reject.
  • This package still allows reject and treats it as an alias fordecline.
  • The old reject enum value was replaced with a static constant equal
    exactly to decline, so switches are not affected.
• Add title parameter to Prompt constructor.

package:dart_mcp v0.3.2

• Deprecate the EnumSchema type in favor of the StringSchema with an
  enumValues parameter. The EnumSchema type was not MCP spec compatible.
  • Also deprecated the associated JsonType.enumeration which doesn't exist
    in the JSON schema spec.

package:dart_mcp v0.3.1

• Fixes communication problem when a MCPServer is instantiated without
  instructions.
• Fix the content argument to PromptMessage to be a single Content object.
• Add new package:dart_mcp/stdio.dart library with a stdioChannel utility
  for creating a stream channel that separates messages by newlines.
• Added more examples.
• Deprecated the WithElicitationHandler interface - the method this required
  is now defined directly on the ElicitationSupport mixin which matches the
  pattern used by other mixins in this package.
• Change the schema parameter for elicitation requests to an ObjectSchema to
  match the spec.
• Deprecate the Elicitations server capability, this doesn't exist in the spec.

package:dart_mcp v0.3.0

• Added error checking to required fields of all Request subclasses so that
  they will throw helpful errors when accessed and not set.
• Added enum support to Schema.
• Add more detail to type validation errors.
• Remove some duplicate validation errors, errors are only reported for the
  leaf nodes and not all the way up the tree.
  • Deprecated a few validation error types as a part of this, including
    propertyNamesInvalid, propertyValueInvalid, itemInvalid and
    prefixItemInvalid.
• Added a custom validation error type.
• Breaking: Auto-validate schemas for all tools by default. This can be
  disabled by passing validateArguments: false to registerTool.
• Updates to the latest MCP spec, 2025-06-08
  • Adds support for Elicitations to allow the server to ask the user questions.
  • Adds ResourceLink as a tool return content type.
  • Adds support for structured tool output.
• Breaking: Change MCPClient.connectStdioServer signature to accept stdin
  and stdout streams instead of starting processes itself. This enables custom
  process spawning (such as using package:process), and also enables the client
  to run in browser environments.
• Fixed a problem where specifying --log-file would cause the server to stop
  working.

package:dart_mcp v0.2.2

• Refactor ClientImplementation and ServerImplementation to the shared
  Implementation type to match the spec. The old names are deprecated but will
  still work until the next breaking release.
• Add clientInfo field to MCPServer, assigned during initialization.
• Move the done future from the ServerConnection into MCPBase so it is
  available to the MPCServer class as well.

package:dart_mcp v0.2.1

• Fix the protocolLogSink support when using MCPClient.connectStdioServer.
• Update workflow example to show thinking spinner and input and output token
  usage.
• Update file system example to support relative paths.
• Fix a bug in notification handling where leaving off the parameters caused a
  type exception.
• Added --help, --log, and --model flags to the workflow example.
• Fixed a bug where the examples would only connect to a server with the latest
  protocol version.
• Handle failed calls to listRoots in the RootsTrackingSupport mixin more
  gracefully. Previously this would leave the roots future hanging
  indefinitely, but now it will log an error and set the roots to empty.
• Added validation for Schema extension.
• Fixed an issue where getting the type of a Schema with a null type would
  throw.

package:dart_mcp v0.2.0

• Support protocol version 2025-03-26.
  • Adds support for AudioContent.
  • Adds support for ToolAnnotations.
  • Adds support for ProgressNotification messages.
• Save the ServerCapabilities object on the ServerConnection class to make
  it easier to check the capabilities of the server.
• Add default version negotiation logic.
  • Save the negotiated ProtocolVersion in a protocolVersion field for both
    MCPServer and the ServerConnection classes.
  • Automatically disconnect from servers if version negotiation fails.
• Added support for adding and listing ResourceTemplates.
  • Handlers have to handle their own matching of templates.
• Added a RootsTrackingSupport server mixin which can be used to keep an
  updated list of the roots set by the client.
• Added default throttling with a 500ms delay for
  ResourceListChangedNotifications and ResourceUpdatedNotifications. The
  delay can be modified by overriding
  ResourcesSupport.resourceUpdateThrottleDelay.
• Add Sink<String> protocolLogSink parameters to server constructor and client
  connection methods, which can be used to capture protocol messages for
  debugging purposes.
• Only send notifications if the peer is still connected. Fixes issues where
  notifications are delayed due to throttling and the client has since closed.
• Breaking: Fixed paginated result subtypes to use nextCursor instead of
  cursor as the key for the next cursor.
• Breaking: Change the ProgressNotification.progress and
  ProgressNotification.total types to num instead of int to align with the
  spec.
• Breaking: Change the protocolVersion string to a ProtocolVersion enum,
  which has all supported versions and whether or not they are supported.
• Breaking: Change InitializeRequest and InitializeResult to take a
  ProtocolVersion instead of a string.
• Breaking: Change the InitializeResult's instructions to String? to reflect
  that not all servers return instructions.
• Breaking: Change MCPBase to accept a StreamChannel<String> instead of
  a Peer, and construct its own Peer.
• Breaking: Add protocolLogSink optional parameter to connect methods on
  MCPClient.
• Breaking: Move channel parameter on MCPServer.new to a positional
  parameter for consistency.