diff --git a/xml/ns-Microsoft.Extensions.AI.Evaluation.Quality.xml b/xml/ns-Microsoft.Extensions.AI.Evaluation.Quality.xml
index 7fc1e885a2a..28eeed78296 100644
--- a/xml/ns-Microsoft.Extensions.AI.Evaluation.Quality.xml
+++ b/xml/ns-Microsoft.Extensions.AI.Evaluation.Quality.xml
@@ -1,6 +1,6 @@
 <Namespace Name="Microsoft.Extensions.AI.Evaluation.Quality">
   <Docs>
-    <summary>To be added.</summary>
+    <summary>Contains evaluator classes that assess the quality of large language model (LLM) responses in an app according to various metrics.</summary>
     <remarks>To be added.</remarks>
   </Docs>
 </Namespace>
diff --git a/xml/ns-Microsoft.Extensions.AI.Evaluation.Reporting.Formats.Html.xml b/xml/ns-Microsoft.Extensions.AI.Evaluation.Reporting.Formats.Html.xml
index 4da6ce69504..09dffd30554 100644
--- a/xml/ns-Microsoft.Extensions.AI.Evaluation.Reporting.Formats.Html.xml
+++ b/xml/ns-Microsoft.Extensions.AI.Evaluation.Reporting.Formats.Html.xml
@@ -1,6 +1,6 @@
 <Namespace Name="Microsoft.Extensions.AI.Evaluation.Reporting.Formats.Html">
   <Docs>
-    <summary>To be added.</summary>
+    <summary>Contains classes for generating HTML reports that contain evaluation metrics for AI models.</summary>
     <remarks>To be added.</remarks>
   </Docs>
 </Namespace>
diff --git a/xml/ns-Microsoft.Extensions.AI.Evaluation.Reporting.Formats.Json.xml b/xml/ns-Microsoft.Extensions.AI.Evaluation.Reporting.Formats.Json.xml
index 5e2df520c67..d6e27511c43 100644
--- a/xml/ns-Microsoft.Extensions.AI.Evaluation.Reporting.Formats.Json.xml
+++ b/xml/ns-Microsoft.Extensions.AI.Evaluation.Reporting.Formats.Json.xml
@@ -1,6 +1,6 @@
 <Namespace Name="Microsoft.Extensions.AI.Evaluation.Reporting.Formats.Json">
   <Docs>
-    <summary>To be added.</summary>
+    <summary>Contains classes for generating JSON reports that contain evaluation metrics for AI models.</summary>
     <remarks>To be added.</remarks>
   </Docs>
 </Namespace>
diff --git a/xml/ns-Microsoft.Extensions.AI.Evaluation.Reporting.Storage.xml b/xml/ns-Microsoft.Extensions.AI.Evaluation.Reporting.Storage.xml
index f542f948790..eb24bb31ce7 100644
--- a/xml/ns-Microsoft.Extensions.AI.Evaluation.Reporting.Storage.xml
+++ b/xml/ns-Microsoft.Extensions.AI.Evaluation.Reporting.Storage.xml
@@ -1,6 +1,6 @@
 <Namespace Name="Microsoft.Extensions.AI.Evaluation.Reporting.Storage">
   <Docs>
-    <summary>To be added.</summary>
+    <summary>Contains classes for storing the results of large language model (LLM) evaluations and for caching LLM responses produced during such evaluations.</summary>
     <remarks>To be added.</remarks>
   </Docs>
 </Namespace>
diff --git a/xml/ns-Microsoft.Extensions.AI.Evaluation.Reporting.xml b/xml/ns-Microsoft.Extensions.AI.Evaluation.Reporting.xml
index b6cab8cf24f..583a27cb0d9 100644
--- a/xml/ns-Microsoft.Extensions.AI.Evaluation.Reporting.xml
+++ b/xml/ns-Microsoft.Extensions.AI.Evaluation.Reporting.xml
@@ -1,6 +1,6 @@
 <Namespace Name="Microsoft.Extensions.AI.Evaluation.Reporting">
   <Docs>
-    <summary>To be added.</summary>
+    <summary>Contains classes for generating reports based on AI evaluation metrics and for caching AI model responses.</summary>
     <remarks>To be added.</remarks>
   </Docs>
 </Namespace>
diff --git a/xml/ns-Microsoft.Extensions.AI.Evaluation.xml b/xml/ns-Microsoft.Extensions.AI.Evaluation.xml
index ab4d1dec6e0..ec7275604c7 100644
--- a/xml/ns-Microsoft.Extensions.AI.Evaluation.xml
+++ b/xml/ns-Microsoft.Extensions.AI.Evaluation.xml
@@ -1,6 +1,8 @@
 <Namespace Name="Microsoft.Extensions.AI.Evaluation">
   <Docs>
-    <summary>To be added.</summary>
+    <summary>
+Contains types and abstractions for evaluating AI-generated responses, including metrics, evaluators, and extensions for interpreting and processing evaluation results.
+</summary>
     <remarks>To be added.</remarks>
   </Docs>
 </Namespace>
diff --git a/xml/ns-Microsoft.Extensions.AI.xml b/xml/ns-Microsoft.Extensions.AI.xml
index fd90fb9bd94..e210eb6e93a 100644
--- a/xml/ns-Microsoft.Extensions.AI.xml
+++ b/xml/ns-Microsoft.Extensions.AI.xml
@@ -1,6 +1,9 @@
 <Namespace Name="Microsoft.Extensions.AI">
   <Docs>
-    <summary>To be added.</summary>
+    <summary>
+      Contains types for building and managing AI-related functionality, including chat clients, embedding generators,
+      tools, and utilities for working with AI services.
+</summary>
     <remarks>To be added.</remarks>
   </Docs>
 </Namespace>
diff --git a/xml/ns-Microsoft.Extensions.AmbientMetadata.xml b/xml/ns-Microsoft.Extensions.AmbientMetadata.xml
index 494523a46dc..906cb9ec686 100644
--- a/xml/ns-Microsoft.Extensions.AmbientMetadata.xml
+++ b/xml/ns-Microsoft.Extensions.AmbientMetadata.xml
@@ -1,6 +1,6 @@
 <Namespace Name="Microsoft.Extensions.AmbientMetadata">
   <Docs>
-    <summary>To be added.</summary>
+    <summary>Contains a class that represents an application-level metadata model.</summary>
     <remarks>To be added.</remarks>
   </Docs>
 </Namespace>
diff --git a/xml/ns-Microsoft.Extensions.AsyncState.xml b/xml/ns-Microsoft.Extensions.AsyncState.xml
index 14affcfdb07..fd9e5df2017 100644
--- a/xml/ns-Microsoft.Extensions.AsyncState.xml
+++ b/xml/ns-Microsoft.Extensions.AsyncState.xml
@@ -1,6 +1,6 @@
 <Namespace Name="Microsoft.Extensions.AsyncState">
   <Docs>
-    <summary>To be added.</summary>
+    <summary>Contains a class that represents a registered context within the asynchronous state.</summary>
     <remarks>To be added.</remarks>
   </Docs>
 </Namespace>
diff --git a/xml/ns-Microsoft.Extensions.Caching.Distributed.xml b/xml/ns-Microsoft.Extensions.Caching.Distributed.xml
index c80810ac1c1..c1c67d2bbd3 100644
--- a/xml/ns-Microsoft.Extensions.Caching.Distributed.xml
+++ b/xml/ns-Microsoft.Extensions.Caching.Distributed.xml
@@ -1,6 +1,6 @@
 <Namespace Name="Microsoft.Extensions.Caching.Distributed">
   <Docs>
-    <summary>To be added.</summary>
+    <summary>Contains types for distributed caching, including interfaces and implementations for caching serialized values.</summary>
     <remarks>To be added.</remarks>
   </Docs>
 </Namespace>
diff --git a/xml/ns-Microsoft.Extensions.Caching.Hybrid.xml b/xml/ns-Microsoft.Extensions.Caching.Hybrid.xml
index 71090afec4e..a482089b161 100644
--- a/xml/ns-Microsoft.Extensions.Caching.Hybrid.xml
+++ b/xml/ns-Microsoft.Extensions.Caching.Hybrid.xml
@@ -1,6 +1,6 @@
 <Namespace Name="Microsoft.Extensions.Caching.Hybrid">
   <Docs>
-    <summary>To be added.</summary>
+    <summary>Contains types for hybrid caching, combining in-memory and distributed caching strategies.</summary>
     <remarks>To be added.</remarks>
   </Docs>
 </Namespace>
diff --git a/xml/ns-Microsoft.Extensions.Caching.Memory.xml b/xml/ns-Microsoft.Extensions.Caching.Memory.xml
index 39510ca8675..79f91e9072d 100644
--- a/xml/ns-Microsoft.Extensions.Caching.Memory.xml
+++ b/xml/ns-Microsoft.Extensions.Caching.Memory.xml
@@ -1,6 +1,6 @@
 <Namespace Name="Microsoft.Extensions.Caching.Memory">
   <Docs>
-    <summary>To be added.</summary>
+    <summary>Contains types for in-memory caching, including interfaces and implementations for local caching.</summary>
     <remarks>To be added.</remarks>
   </Docs>
 </Namespace>
diff --git a/xml/ns-Microsoft.Extensions.Caching.SqlServer.xml b/xml/ns-Microsoft.Extensions.Caching.SqlServer.xml
index 6eb9b15d9a2..e23b59ee6e6 100644
--- a/xml/ns-Microsoft.Extensions.Caching.SqlServer.xml
+++ b/xml/ns-Microsoft.Extensions.Caching.SqlServer.xml
@@ -1,6 +1,6 @@
 <Namespace Name="Microsoft.Extensions.Caching.SqlServer">
   <Docs>
-    <summary>To be added.</summary>
+    <summary>Contains types for distributed caching using Microsoft SQL Server as the backend store.</summary>
     <remarks>To be added.</remarks>
   </Docs>
 </Namespace>
diff --git a/xml/ns-Microsoft.Extensions.Caching.StackExchangeRedis.xml b/xml/ns-Microsoft.Extensions.Caching.StackExchangeRedis.xml
index 8866be29c76..5c6699801bb 100644
--- a/xml/ns-Microsoft.Extensions.Caching.StackExchangeRedis.xml
+++ b/xml/ns-Microsoft.Extensions.Caching.StackExchangeRedis.xml
@@ -1,6 +1,6 @@
 <Namespace Name="Microsoft.Extensions.Caching.StackExchangeRedis">
   <Docs>
-    <summary>To be added.</summary>
+    <summary>Contains types for distributed caching using Redis as the backend store.</summary>
     <remarks>To be added.</remarks>
   </Docs>
 </Namespace>
diff --git a/xml/ns-Microsoft.Extensions.Compliance.Classification.xml b/xml/ns-Microsoft.Extensions.Compliance.Classification.xml
index 680002a0b23..bc94ed3c43f 100644
--- a/xml/ns-Microsoft.Extensions.Compliance.Classification.xml
+++ b/xml/ns-Microsoft.Extensions.Compliance.Classification.xml
@@ -1,6 +1,6 @@
 <Namespace Name="Microsoft.Extensions.Compliance.Classification">
   <Docs>
-    <summary>To be added.</summary>
+    <summary>Contains types for data classification, including attributes and utilities for classifying and managing data.</summary>
     <remarks>To be added.</remarks>
   </Docs>
 </Namespace>
diff --git a/xml/ns-Microsoft.Extensions.Compliance.Redaction.xml b/xml/ns-Microsoft.Extensions.Compliance.Redaction.xml
index d5946eb8933..191eab219c5 100644
--- a/xml/ns-Microsoft.Extensions.Compliance.Redaction.xml
+++ b/xml/ns-Microsoft.Extensions.Compliance.Redaction.xml
@@ -1,6 +1,6 @@
 <Namespace Name="Microsoft.Extensions.Compliance.Redaction">
   <Docs>
-    <summary>To be added.</summary>
+    <summary>Contains types for redacting sensitive data, including redactors and related utilities.</summary>
     <remarks>To be added.</remarks>
   </Docs>
 </Namespace>
diff --git a/xml/ns-Microsoft.Extensions.Compliance.Testing.xml b/xml/ns-Microsoft.Extensions.Compliance.Testing.xml
index aad9cd811de..5895341a92a 100644
--- a/xml/ns-Microsoft.Extensions.Compliance.Testing.xml
+++ b/xml/ns-Microsoft.Extensions.Compliance.Testing.xml
@@ -1,6 +1,6 @@
 <Namespace Name="Microsoft.Extensions.Compliance.Testing">
   <Docs>
-    <summary>To be added.</summary>
+    <summary>Contains types for testing compliance features, including fake redactors and data classifications.</summary>
     <remarks>To be added.</remarks>
   </Docs>
 </Namespace>
diff --git a/xml/ns-Microsoft.Extensions.Configuration.EnvironmentVariables.xml b/xml/ns-Microsoft.Extensions.Configuration.EnvironmentVariables.xml
index 90667821a9e..0faff2e7897 100644
--- a/xml/ns-Microsoft.Extensions.Configuration.EnvironmentVariables.xml
+++ b/xml/ns-Microsoft.Extensions.Configuration.EnvironmentVariables.xml
@@ -1,6 +1,6 @@
 <Namespace Name="Microsoft.Extensions.Configuration.EnvironmentVariables">
   <Docs>
-    <summary>To be added.</summary>
+    <summary>Contains classes for providing configuration key-value pairs from environment variables.</summary>
     <remarks>To be added.</remarks>
   </Docs>
 </Namespace>
diff --git a/xml/ns-Microsoft.Extensions.Configuration.KeyPerFile.xml b/xml/ns-Microsoft.Extensions.Configuration.KeyPerFile.xml
index f3b4d8c93ad..8f66b94ea78 100644
--- a/xml/ns-Microsoft.Extensions.Configuration.KeyPerFile.xml
+++ b/xml/ns-Microsoft.Extensions.Configuration.KeyPerFile.xml
@@ -1,6 +1,6 @@
 <Namespace Name="Microsoft.Extensions.Configuration.KeyPerFile">
   <Docs>
-    <summary>To be added.</summary>
+    <summary>Contains classes for using a directory's files as configuration key-value pairs.</summary>
     <remarks>To be added.</remarks>
   </Docs>
 </Namespace>
diff --git a/xml/ns-Microsoft.Extensions.DependencyInjection.Extensions.xml b/xml/ns-Microsoft.Extensions.DependencyInjection.Extensions.xml
index fbe27b19ce1..6c160f3b05b 100644
--- a/xml/ns-Microsoft.Extensions.DependencyInjection.Extensions.xml
+++ b/xml/ns-Microsoft.Extensions.DependencyInjection.Extensions.xml
@@ -1,6 +1,6 @@
 <Namespace Name="Microsoft.Extensions.DependencyInjection.Extensions">
   <Docs>
-    <summary>To be added.</summary>
+    <summary>Contains extension methods for adding and removing services in an <c>IServiceCollection</c>.</summary>
     <remarks>To be added.</remarks>
   </Docs>
 </Namespace>
diff --git a/xml/ns-Microsoft.Extensions.DependencyInjection.Pools.xml b/xml/ns-Microsoft.Extensions.DependencyInjection.Pools.xml
index 9f4883fbeab..f01502689b0 100644
--- a/xml/ns-Microsoft.Extensions.DependencyInjection.Pools.xml
+++ b/xml/ns-Microsoft.Extensions.DependencyInjection.Pools.xml
@@ -1,6 +1,6 @@
 <Namespace Name="Microsoft.Extensions.DependencyInjection.Pools">
   <Docs>
-    <summary>To be added.</summary>
+    <summary>Contains classes and extension methods for configuring and managing object pools in the dependency injection container.</summary>
     <remarks>To be added.</remarks>
   </Docs>
 </Namespace>
diff --git a/xml/ns-Microsoft.Extensions.DependencyModel.xml b/xml/ns-Microsoft.Extensions.DependencyModel.xml
index c643a06511c..4518cde78f1 100644
--- a/xml/ns-Microsoft.Extensions.DependencyModel.xml
+++ b/xml/ns-Microsoft.Extensions.DependencyModel.xml
@@ -1,6 +1,6 @@
 <Namespace Name="Microsoft.Extensions.DependencyModel">
   <Docs>
-    <summary>To be added.</summary>
+    <summary>Contains classes, structs, and interfaces for managing application dependencies, including compile-time and run-time library dependencies.</summary>
     <remarks>To be added.</remarks>
   </Docs>
 </Namespace>
diff --git a/xml/ns-Microsoft.Extensions.DiagnosticAdapter.Infrastructure.xml b/xml/ns-Microsoft.Extensions.DiagnosticAdapter.Infrastructure.xml
index 012f6fa14b6..0d41b9a9906 100644
--- a/xml/ns-Microsoft.Extensions.DiagnosticAdapter.Infrastructure.xml
+++ b/xml/ns-Microsoft.Extensions.DiagnosticAdapter.Infrastructure.xml
@@ -1,6 +1,6 @@
 <Namespace Name="Microsoft.Extensions.DiagnosticAdapter.Infrastructure">
   <Docs>
-    <summary>To be added.</summary>
+    <summary>Contains interfaces for creating and managing proxy objects, including factories for run-time proxy creation and unwrappable proxy objects.</summary>
     <remarks>To be added.</remarks>
   </Docs>
 </Namespace>
diff --git a/xml/ns-Microsoft.Extensions.Diagnostics.Enrichment.xml b/xml/ns-Microsoft.Extensions.Diagnostics.Enrichment.xml
index cef087def8b..91931e76ac0 100644
--- a/xml/ns-Microsoft.Extensions.Diagnostics.Enrichment.xml
+++ b/xml/ns-Microsoft.Extensions.Diagnostics.Enrichment.xml
@@ -1,6 +1,6 @@
 <Namespace Name="Microsoft.Extensions.Diagnostics.Enrichment">
   <Docs>
-    <summary>To be added.</summary>
+    <summary>Contains classes and interfaces for enriching log records with additional properties, including options and constants for application and process enrichment.</summary>
     <remarks>To be added.</remarks>
   </Docs>
 </Namespace>
diff --git a/xml/ns-Microsoft.Extensions.Diagnostics.ExceptionSummarization.xml b/xml/ns-Microsoft.Extensions.Diagnostics.ExceptionSummarization.xml
index 6b2c2ada901..d62b7a83b56 100644
--- a/xml/ns-Microsoft.Extensions.Diagnostics.ExceptionSummarization.xml
+++ b/xml/ns-Microsoft.Extensions.Diagnostics.ExceptionSummarization.xml
@@ -1,6 +1,6 @@
 <Namespace Name="Microsoft.Extensions.Diagnostics.ExceptionSummarization">
   <Docs>
-    <summary>To be added.</summary>
+    <summary>Contains classes, structs, and interfaces for summarizing exceptions for use in telemetry, including mechanisms to register and implement exception summary providers.</summary>
     <remarks>To be added.</remarks>
   </Docs>
 </Namespace>
diff --git a/xml/ns-Microsoft.Extensions.Diagnostics.HealthChecks.xml b/xml/ns-Microsoft.Extensions.Diagnostics.HealthChecks.xml
index 306091644c6..dc6c7cf61f2 100644
--- a/xml/ns-Microsoft.Extensions.Diagnostics.HealthChecks.xml
+++ b/xml/ns-Microsoft.Extensions.Diagnostics.HealthChecks.xml
@@ -1,6 +1,6 @@
 <Namespace Name="Microsoft.Extensions.Diagnostics.HealthChecks">
   <Docs>
-    <summary>To be added.</summary>
+    <summary>Contains classes and interfaces for configuring and managing health checks, including options for resource utilization, telemetry, and manual health status control.</summary>
     <remarks>To be added.</remarks>
   </Docs>
 </Namespace>
diff --git a/xml/ns-Microsoft.Extensions.Diagnostics.Latency.xml b/xml/ns-Microsoft.Extensions.Diagnostics.Latency.xml
index 7897d972fb9..89f900fe17a 100644
--- a/xml/ns-Microsoft.Extensions.Diagnostics.Latency.xml
+++ b/xml/ns-Microsoft.Extensions.Diagnostics.Latency.xml
@@ -1,6 +1,6 @@
 <Namespace Name="Microsoft.Extensions.Diagnostics.Latency">
   <Docs>
-    <summary>To be added.</summary>
+    <summary>Contains classes, structs, and interfaces for measuring and exporting latency data, including options for latency contexts, checkpoints, measures, and tags.</summary>
     <remarks>To be added.</remarks>
   </Docs>
 </Namespace>
diff --git a/xml/ns-Microsoft.Extensions.Diagnostics.Metrics.Configuration.xml b/xml/ns-Microsoft.Extensions.Diagnostics.Metrics.Configuration.xml
index 2e0f3281516..2cb782785de 100644
--- a/xml/ns-Microsoft.Extensions.Diagnostics.Metrics.Configuration.xml
+++ b/xml/ns-Microsoft.Extensions.Diagnostics.Metrics.Configuration.xml
@@ -1,6 +1,6 @@
 <Namespace Name="Microsoft.Extensions.Diagnostics.Metrics.Configuration">
   <Docs>
-    <summary>To be added.</summary>
+    <summary>Contains types for retrieving and managing metrics configuration for specific listener names.</summary>
     <remarks>To be added.</remarks>
   </Docs>
 </Namespace>
diff --git a/xml/ns-Microsoft.Extensions.Diagnostics.Metrics.Testing.xml b/xml/ns-Microsoft.Extensions.Diagnostics.Metrics.Testing.xml
index d3fdb848160..bd0f33a3ff6 100644
--- a/xml/ns-Microsoft.Extensions.Diagnostics.Metrics.Testing.xml
+++ b/xml/ns-Microsoft.Extensions.Diagnostics.Metrics.Testing.xml
@@ -1,6 +1,6 @@
 <Namespace Name="Microsoft.Extensions.Diagnostics.Metrics.Testing">
   <Docs>
-    <summary>To be added.</summary>
+    <summary>Contains classes for testing metrics, including tools for collecting and working with measurements from instruments.</summary>
     <remarks>To be added.</remarks>
   </Docs>
 </Namespace>
diff --git a/xml/ns-Microsoft.Extensions.Diagnostics.Metrics.xml b/xml/ns-Microsoft.Extensions.Diagnostics.Metrics.xml
index a665ade224b..5f507d221af 100644
--- a/xml/ns-Microsoft.Extensions.Diagnostics.Metrics.xml
+++ b/xml/ns-Microsoft.Extensions.Diagnostics.Metrics.xml
@@ -1,6 +1,6 @@
 <Namespace Name="Microsoft.Extensions.Diagnostics.Metrics">
   <Docs>
-    <summary>To be added.</summary>
+    <summary>Contains classes, interfaces, and enums for configuring, producing, and managing metrics, including support for strongly typed metrics, instrument rules, and listener configurations.</summary>
     <remarks>To be added.</remarks>
   </Docs>
 </Namespace>
diff --git a/xml/ns-Microsoft.Extensions.Diagnostics.Probes.xml b/xml/ns-Microsoft.Extensions.Diagnostics.Probes.xml
index bbc4784a913..f84b1223ea0 100644
--- a/xml/ns-Microsoft.Extensions.Diagnostics.Probes.xml
+++ b/xml/ns-Microsoft.Extensions.Diagnostics.Probes.xml
@@ -1,6 +1,6 @@
 <Namespace Name="Microsoft.Extensions.Diagnostics.Probes">
   <Docs>
-    <summary>To be added.</summary>
+    <summary>Contains classes for configuring and managing health-check probes, including options for Kubernetes and TCP-based probes, and standardized health-check tags.</summary>
     <remarks>To be added.</remarks>
   </Docs>
 </Namespace>
diff --git a/xml/ns-Microsoft.Extensions.Diagnostics.ResourceMonitoring.xml b/xml/ns-Microsoft.Extensions.Diagnostics.ResourceMonitoring.xml
index e685ce69604..ae41f66a5ef 100644
--- a/xml/ns-Microsoft.Extensions.Diagnostics.ResourceMonitoring.xml
+++ b/xml/ns-Microsoft.Extensions.Diagnostics.ResourceMonitoring.xml
@@ -1,6 +1,6 @@
 <Namespace Name="Microsoft.Extensions.Diagnostics.ResourceMonitoring">
   <Docs>
-    <summary>To be added.</summary>
+    <summary>Contains classes, structs, and interfaces for monitoring system resources, including options for configuration, resource utilization snapshots, and publishers for resource data.</summary>
     <remarks>To be added.</remarks>
   </Docs>
 </Namespace>
diff --git a/xml/ns-Microsoft.Extensions.Diagnostics.Sampling.xml b/xml/ns-Microsoft.Extensions.Diagnostics.Sampling.xml
index f24a6f9d945..67807aa0411 100644
--- a/xml/ns-Microsoft.Extensions.Diagnostics.Sampling.xml
+++ b/xml/ns-Microsoft.Extensions.Diagnostics.Sampling.xml
@@ -1,6 +1,6 @@
 <Namespace Name="Microsoft.Extensions.Diagnostics.Sampling">
   <Docs>
-    <summary>To be added.</summary>
+    <summary>Contains classes for configuring and managing log sampling, including options and rules for random probabilistic sampling.</summary>
     <remarks>To be added.</remarks>
   </Docs>
 </Namespace>
diff --git a/xml/ns-Microsoft.Extensions.EnumStrings.xml b/xml/ns-Microsoft.Extensions.EnumStrings.xml
index 7654906073b..75fc5c9845c 100644
--- a/xml/ns-Microsoft.Extensions.EnumStrings.xml
+++ b/xml/ns-Microsoft.Extensions.EnumStrings.xml
@@ -1,6 +1,6 @@
 <Namespace Name="Microsoft.Extensions.EnumStrings">
   <Docs>
-    <summary>To be added.</summary>
+    <summary>Contains a class that provides information to guide the production of an extension method to efficiently convert an enum value into string form.</summary>
     <remarks>To be added.</remarks>
   </Docs>
 </Namespace>
diff --git a/xml/ns-Microsoft.Extensions.FileProviders.Composite.xml b/xml/ns-Microsoft.Extensions.FileProviders.Composite.xml
index 7ce14c42804..d810c3d6c94 100644
--- a/xml/ns-Microsoft.Extensions.FileProviders.Composite.xml
+++ b/xml/ns-Microsoft.Extensions.FileProviders.Composite.xml
@@ -1,6 +1,6 @@
 <Namespace Name="Microsoft.Extensions.FileProviders.Composite">
   <Docs>
-    <summary>To be added.</summary>
+    <summary>Contains a class that represents composite directory contents.</summary>
     <remarks>To be added.</remarks>
   </Docs>
 </Namespace>
diff --git a/xml/ns-Microsoft.Extensions.FileProviders.Embedded.xml b/xml/ns-Microsoft.Extensions.FileProviders.Embedded.xml
index 966daa9f80b..ae1dba12d2f 100644
--- a/xml/ns-Microsoft.Extensions.FileProviders.Embedded.xml
+++ b/xml/ns-Microsoft.Extensions.FileProviders.Embedded.xml
@@ -1,6 +1,6 @@
 <Namespace Name="Microsoft.Extensions.FileProviders.Embedded">
   <Docs>
-    <summary>To be added.</summary>
+    <summary>Contains a class that represents a file embedded in an assembly.</summary>
     <remarks>To be added.</remarks>
   </Docs>
 </Namespace>
diff --git a/xml/ns-Microsoft.Extensions.FileProviders.Internal.xml b/xml/ns-Microsoft.Extensions.FileProviders.Internal.xml
index b863a26be8b..e69a1aec202 100644
--- a/xml/ns-Microsoft.Extensions.FileProviders.Internal.xml
+++ b/xml/ns-Microsoft.Extensions.FileProviders.Internal.xml
@@ -1,6 +1,6 @@
 <Namespace Name="Microsoft.Extensions.FileProviders.Internal">
   <Docs>
-    <summary>To be added.</summary>
+    <summary>Contains a class that represents the contents of a physical file directory.</summary>
     <remarks>To be added.</remarks>
   </Docs>
 </Namespace>
diff --git a/xml/ns-Microsoft.Extensions.FileProviders.Physical.xml b/xml/ns-Microsoft.Extensions.FileProviders.Physical.xml
index de123121774..f0908770f98 100644
--- a/xml/ns-Microsoft.Extensions.FileProviders.Physical.xml
+++ b/xml/ns-Microsoft.Extensions.FileProviders.Physical.xml
@@ -1,6 +1,6 @@
 <Namespace Name="Microsoft.Extensions.FileProviders.Physical">
   <Docs>
-    <summary>To be added.</summary>
+    <summary>Provides classes and enums for working with the physical file system.</summary>
     <remarks>To be added.</remarks>
   </Docs>
 </Namespace>
diff --git a/xml/ns-Microsoft.Extensions.FileProviders.xml b/xml/ns-Microsoft.Extensions.FileProviders.xml
index 5c425cd1fce..ccd67bcfec3 100644
--- a/xml/ns-Microsoft.Extensions.FileProviders.xml
+++ b/xml/ns-Microsoft.Extensions.FileProviders.xml
@@ -1,6 +1,6 @@
 <Namespace Name="Microsoft.Extensions.FileProviders">
   <Docs>
-    <summary>To be added.</summary>
+    <summary>Provides abstractions and implementations for accessing file systems.</summary>
     <remarks>To be added.</remarks>
   </Docs>
 </Namespace>
diff --git a/xml/ns-Microsoft.Extensions.FileSystemGlobbing.Abstractions.xml b/xml/ns-Microsoft.Extensions.FileSystemGlobbing.Abstractions.xml
index 5f7ff02b7c0..dccb07b33fc 100644
--- a/xml/ns-Microsoft.Extensions.FileSystemGlobbing.Abstractions.xml
+++ b/xml/ns-Microsoft.Extensions.FileSystemGlobbing.Abstractions.xml
@@ -1,6 +1,6 @@
 <Namespace Name="Microsoft.Extensions.FileSystemGlobbing.Abstractions">
   <Docs>
-    <summary>To be added.</summary>
+    <summary>Contains abstractions for file system entities and their wrapper implementations.</summary>
     <remarks>To be added.</remarks>
   </Docs>
 </Namespace>
diff --git a/xml/ns-Microsoft.Extensions.FileSystemGlobbing.Internal.PathSegments.xml b/xml/ns-Microsoft.Extensions.FileSystemGlobbing.Internal.PathSegments.xml
index 6ea90e6f2f8..d2868d4ff71 100644
--- a/xml/ns-Microsoft.Extensions.FileSystemGlobbing.Internal.PathSegments.xml
+++ b/xml/ns-Microsoft.Extensions.FileSystemGlobbing.Internal.PathSegments.xml
@@ -1,6 +1,6 @@
 <Namespace Name="Microsoft.Extensions.FileSystemGlobbing.Internal.PathSegments">
   <Docs>
-    <summary>To be added.</summary>
+    <summary>Contains classes that support the file system globbing infrastructure. These APIs are not intended for direct use and might change in future releases.</summary>
     <remarks>To be added.</remarks>
   </Docs>
 </Namespace>
diff --git a/xml/ns-Microsoft.Extensions.FileSystemGlobbing.Internal.PatternContexts.xml b/xml/ns-Microsoft.Extensions.FileSystemGlobbing.Internal.PatternContexts.xml
index c3132eec5e8..98aeacd5736 100644
--- a/xml/ns-Microsoft.Extensions.FileSystemGlobbing.Internal.PatternContexts.xml
+++ b/xml/ns-Microsoft.Extensions.FileSystemGlobbing.Internal.PatternContexts.xml
@@ -1,6 +1,6 @@
 <Namespace Name="Microsoft.Extensions.FileSystemGlobbing.Internal.PatternContexts">
   <Docs>
-    <summary>To be added.</summary>
+    <summary>Contains classes and structs that support the file system globbing infrastructure. These APIs are not intended for direct use and might change in future releases.</summary>
     <remarks>To be added.</remarks>
   </Docs>
 </Namespace>
diff --git a/xml/ns-Microsoft.Extensions.FileSystemGlobbing.Internal.Patterns.xml b/xml/ns-Microsoft.Extensions.FileSystemGlobbing.Internal.Patterns.xml
index 8521b3ad135..5326949ac1c 100644
--- a/xml/ns-Microsoft.Extensions.FileSystemGlobbing.Internal.Patterns.xml
+++ b/xml/ns-Microsoft.Extensions.FileSystemGlobbing.Internal.Patterns.xml
@@ -1,6 +1,6 @@
 <Namespace Name="Microsoft.Extensions.FileSystemGlobbing.Internal.Patterns">
   <Docs>
-    <summary>To be added.</summary>
+    <summary>Contains a class that supports the file system globbing infrastructure. This API is not intended for direct use and might change in future releases.</summary>
     <remarks>To be added.</remarks>
   </Docs>
 </Namespace>
diff --git a/xml/ns-Microsoft.Extensions.FileSystemGlobbing.Internal.xml b/xml/ns-Microsoft.Extensions.FileSystemGlobbing.Internal.xml
index f35bedf2463..517bbe630e9 100644
--- a/xml/ns-Microsoft.Extensions.FileSystemGlobbing.Internal.xml
+++ b/xml/ns-Microsoft.Extensions.FileSystemGlobbing.Internal.xml
@@ -1,6 +1,6 @@
 <Namespace Name="Microsoft.Extensions.FileSystemGlobbing.Internal">
   <Docs>
-    <summary>To be added.</summary>
+    <summary>Contains classes, structs, and interfaces that support the file system globbing infrastructure. These APIs are not intended for direct use and might change in future releases.</summary>
     <remarks>To be added.</remarks>
   </Docs>
 </Namespace>
diff --git a/xml/ns-Microsoft.Extensions.FileSystemGlobbing.xml b/xml/ns-Microsoft.Extensions.FileSystemGlobbing.xml
index c77a5073718..b14af14a02d 100644
--- a/xml/ns-Microsoft.Extensions.FileSystemGlobbing.xml
+++ b/xml/ns-Microsoft.Extensions.FileSystemGlobbing.xml
@@ -1,6 +1,6 @@
 <Namespace Name="Microsoft.Extensions.FileSystemGlobbing">
   <Docs>
-    <summary>To be added.</summary>
+    <summary>Provides classes and structs for file-system pattern matching.</summary>
     <remarks>To be added.</remarks>
   </Docs>
 </Namespace>
diff --git a/xml/ns-Microsoft.Extensions.Hosting.Testing.xml b/xml/ns-Microsoft.Extensions.Hosting.Testing.xml
index 013cce44363..2cd3cc947f8 100644
--- a/xml/ns-Microsoft.Extensions.Hosting.Testing.xml
+++ b/xml/ns-Microsoft.Extensions.Hosting.Testing.xml
@@ -1,6 +1,6 @@
 <Namespace Name="Microsoft.Extensions.Hosting.Testing">
   <Docs>
-    <summary>To be added.</summary>
+    <summary>Contains classes and interfaces for unit testing a host.</summary>
     <remarks>To be added.</remarks>
   </Docs>
 </Namespace>
diff --git a/xml/ns-Microsoft.Extensions.Http.AutoClient.xml b/xml/ns-Microsoft.Extensions.Http.AutoClient.xml
index 900e5387be8..32e465d80dc 100644
--- a/xml/ns-Microsoft.Extensions.Http.AutoClient.xml
+++ b/xml/ns-Microsoft.Extensions.Http.AutoClient.xml
@@ -1,6 +1,6 @@
 <Namespace Name="Microsoft.Extensions.Http.AutoClient">
   <Docs>
-    <summary>To be added.</summary>
+    <summary>Contains classes and enums for generating REST APIs and configuring HTTP client requests.</summary>
     <remarks>To be added.</remarks>
   </Docs>
 </Namespace>
diff --git a/xml/ns-Microsoft.Extensions.Http.Diagnostics.xml b/xml/ns-Microsoft.Extensions.Http.Diagnostics.xml
index 77eba560ef1..dafb831521f 100644
--- a/xml/ns-Microsoft.Extensions.Http.Diagnostics.xml
+++ b/xml/ns-Microsoft.Extensions.Http.Diagnostics.xml
@@ -1,6 +1,6 @@
 <Namespace Name="Microsoft.Extensions.Http.Diagnostics">
   <Docs>
-    <summary>To be added.</summary>
+    <summary>Contains classes, interfaces, and enums for managing HTTP diagnostics, including request metadata and redaction strategies.</summary>
     <remarks>To be added.</remarks>
   </Docs>
 </Namespace>
diff --git a/xml/ns-Microsoft.Extensions.Http.Latency.xml b/xml/ns-Microsoft.Extensions.Http.Latency.xml
index 25a3d018b09..b17642e180a 100644
--- a/xml/ns-Microsoft.Extensions.Http.Latency.xml
+++ b/xml/ns-Microsoft.Extensions.Http.Latency.xml
@@ -1,6 +1,6 @@
 <Namespace Name="Microsoft.Extensions.Http.Latency">
   <Docs>
-    <summary>To be added.</summary>
+    <summary>Contains a class that provides options to configure HTTP client latency telemetry.</summary>
     <remarks>To be added.</remarks>
   </Docs>
 </Namespace>
diff --git a/xml/ns-Microsoft.Extensions.Http.Resilience.xml b/xml/ns-Microsoft.Extensions.Http.Resilience.xml
index 3e36e1fb460..de082c0ec28 100644
--- a/xml/ns-Microsoft.Extensions.Http.Resilience.xml
+++ b/xml/ns-Microsoft.Extensions.Http.Resilience.xml
@@ -1,6 +1,6 @@
 <Namespace Name="Microsoft.Extensions.Http.Resilience">
   <Docs>
-    <summary>To be added.</summary>
+    <summary>Contains classes and interfaces for configuring HTTP resilience strategies, including retry, timeout, circuit breaker, hedging, and routing options.</summary>
     <remarks>To be added.</remarks>
   </Docs>
 </Namespace>
diff --git a/xml/ns-Microsoft.Extensions.Http.Telemetry.Latency.xml b/xml/ns-Microsoft.Extensions.Http.Telemetry.Latency.xml
index 0415dfccfe0..c9c91560fbf 100644
--- a/xml/ns-Microsoft.Extensions.Http.Telemetry.Latency.xml
+++ b/xml/ns-Microsoft.Extensions.Http.Telemetry.Latency.xml
@@ -1,6 +1,6 @@
 <Namespace Name="Microsoft.Extensions.Http.Telemetry.Latency">
   <Docs>
-    <summary>To be added.</summary>
+    <summary>Contains classes for configuring and extending HTTP client latency telemetry.</summary>
     <remarks>To be added.</remarks>
   </Docs>
 </Namespace>
diff --git a/xml/ns-Microsoft.Extensions.Http.Telemetry.Logging.xml b/xml/ns-Microsoft.Extensions.Http.Telemetry.Logging.xml
index 7e0a4a00cb7..76138b65ebe 100644
--- a/xml/ns-Microsoft.Extensions.Http.Telemetry.Logging.xml
+++ b/xml/ns-Microsoft.Extensions.Http.Telemetry.Logging.xml
@@ -1,6 +1,6 @@
 <Namespace Name="Microsoft.Extensions.Http.Telemetry.Logging">
   <Docs>
-    <summary>To be added.</summary>
+    <summary>Contains classes and interfaces for configuring and extending HTTP client request logging.</summary>
     <remarks>To be added.</remarks>
   </Docs>
 </Namespace>
diff --git a/xml/ns-Microsoft.Extensions.Http.Telemetry.xml b/xml/ns-Microsoft.Extensions.Http.Telemetry.xml
index 6fa08952ffe..1efee971229 100644
--- a/xml/ns-Microsoft.Extensions.Http.Telemetry.xml
+++ b/xml/ns-Microsoft.Extensions.Http.Telemetry.xml
@@ -1,6 +1,6 @@
 <Namespace Name="Microsoft.Extensions.Http.Telemetry">
   <Docs>
-    <summary>To be added.</summary>
+    <summary>Contains classes, interfaces, and enums for managing HTTP telemetry, including request metadata and redaction strategies.</summary>
     <remarks>To be added.</remarks>
   </Docs>
 </Namespace>
diff --git a/xml/ns-Microsoft.Extensions.HttpClient.SocketHandling.xml b/xml/ns-Microsoft.Extensions.HttpClient.SocketHandling.xml
index 2f8bcdd74fb..601af2bd913 100644
--- a/xml/ns-Microsoft.Extensions.HttpClient.SocketHandling.xml
+++ b/xml/ns-Microsoft.Extensions.HttpClient.SocketHandling.xml
@@ -1,6 +1,6 @@
 <Namespace Name="Microsoft.Extensions.HttpClient.SocketHandling">
   <Docs>
-    <summary>To be added.</summary>
+    <summary>Contains classes for configuring and customizing <c>SocketsHttpHandler</c> instances for HTTP clients.</summary>
     <remarks>To be added.</remarks>
   </Docs>
 </Namespace>
diff --git a/xml/ns-Microsoft.Extensions.Localization.xml b/xml/ns-Microsoft.Extensions.Localization.xml
index ddf0a05176f..fa46a016085 100644
--- a/xml/ns-Microsoft.Extensions.Localization.xml
+++ b/xml/ns-Microsoft.Extensions.Localization.xml
@@ -1,6 +1,6 @@
 <Namespace Name="Microsoft.Extensions.Localization">
   <Docs>
-    <summary>To be added.</summary>
+    <summary>Contains classes and interfaces for managing and providing localized strings and resources.</summary>
     <remarks>To be added.</remarks>
   </Docs>
 </Namespace>
diff --git a/xml/ns-Microsoft.Extensions.Logging.AzureAppServices.xml b/xml/ns-Microsoft.Extensions.Logging.AzureAppServices.xml
index e37aac40f32..9b9fe0be1e4 100644
--- a/xml/ns-Microsoft.Extensions.Logging.AzureAppServices.xml
+++ b/xml/ns-Microsoft.Extensions.Logging.AzureAppServices.xml
@@ -1,6 +1,6 @@
 <Namespace Name="Microsoft.Extensions.Logging.AzureAppServices">
   <Docs>
-    <summary>To be added.</summary>
+    <summary>Contains classes for integrating logging with Azure App Services.</summary>
     <remarks>To be added.</remarks>
   </Docs>
 </Namespace>
diff --git a/xml/ns-Microsoft.Extensions.Logging.Testing.xml b/xml/ns-Microsoft.Extensions.Logging.Testing.xml
index 451bfa8a2b0..a6d86512c8b 100644
--- a/xml/ns-Microsoft.Extensions.Logging.Testing.xml
+++ b/xml/ns-Microsoft.Extensions.Logging.Testing.xml
@@ -1,6 +1,6 @@
 <Namespace Name="Microsoft.Extensions.Logging.Testing">
   <Docs>
-    <summary>To be added.</summary>
+    <summary>Contains utilities and classes for testing logging functionality.</summary>
     <remarks>To be added.</remarks>
   </Docs>
 </Namespace>
diff --git a/xml/ns-Microsoft.Extensions.ObjectPool.xml b/xml/ns-Microsoft.Extensions.ObjectPool.xml
index a17028cf1dc..b742e71289c 100644
--- a/xml/ns-Microsoft.Extensions.ObjectPool.xml
+++ b/xml/ns-Microsoft.Extensions.ObjectPool.xml
@@ -1,6 +1,6 @@
 <Namespace Name="Microsoft.Extensions.ObjectPool">
   <Docs>
-    <summary>To be added.</summary>
+    <summary>Contains a class that provides configuration options for dependency injection pools.</summary>
     <remarks>To be added.</remarks>
   </Docs>
 </Namespace>
diff --git a/xml/ns-Microsoft.Extensions.Options.Contextual.Provider.xml b/xml/ns-Microsoft.Extensions.Options.Contextual.Provider.xml
index f6a04459a3c..33df5bcb891 100644
--- a/xml/ns-Microsoft.Extensions.Options.Contextual.Provider.xml
+++ b/xml/ns-Microsoft.Extensions.Options.Contextual.Provider.xml
@@ -1,6 +1,6 @@
 <Namespace Name="Microsoft.Extensions.Options.Contextual.Provider">
   <Docs>
-    <summary>To be added.</summary>
+    <summary>Contains classes and interfaces for configuring and retrieving contextual options and collecting context data for options providers.</summary>
     <remarks>To be added.</remarks>
   </Docs>
 </Namespace>
diff --git a/xml/ns-Microsoft.Extensions.Options.Contextual.xml b/xml/ns-Microsoft.Extensions.Options.Contextual.xml
index 256452df4ab..9f67f1aaf38 100644
--- a/xml/ns-Microsoft.Extensions.Options.Contextual.xml
+++ b/xml/ns-Microsoft.Extensions.Options.Contextual.xml
@@ -1,6 +1,6 @@
 <Namespace Name="Microsoft.Extensions.Options.Contextual">
   <Docs>
-    <summary>To be added.</summary>
+    <summary>Contains classes and interfaces for generating and managing contextual options and their associated contexts.</summary>
     <remarks>To be added.</remarks>
   </Docs>
 </Namespace>
diff --git a/xml/ns-Microsoft.Extensions.Options.Validation.xml b/xml/ns-Microsoft.Extensions.Options.Validation.xml
index 9bbc4a41451..1bd1a73cb37 100644
--- a/xml/ns-Microsoft.Extensions.Options.Validation.xml
+++ b/xml/ns-Microsoft.Extensions.Options.Validation.xml
@@ -1,6 +1,6 @@
 <Namespace Name="Microsoft.Extensions.Options.Validation">
   <Docs>
-    <summary>To be added.</summary>
+    <summary>Contains classes for validating options, including attributes for compile-time validation and extension methods for working with validation results.</summary>
     <remarks>To be added.</remarks>
   </Docs>
 </Namespace>
diff --git a/xml/ns-Microsoft.Extensions.Telemetry.Console.xml b/xml/ns-Microsoft.Extensions.Telemetry.Console.xml
index 0f477621e59..646d2d292ee 100644
--- a/xml/ns-Microsoft.Extensions.Telemetry.Console.xml
+++ b/xml/ns-Microsoft.Extensions.Telemetry.Console.xml
@@ -1,6 +1,6 @@
 <Namespace Name="Microsoft.Extensions.Telemetry.Console">
   <Docs>
-    <summary>To be added.</summary>
+    <summary>Contains classes and extensions for configuring and exporting telemetry data to the console, including latency and logging options.</summary>
     <remarks>To be added.</remarks>
   </Docs>
 </Namespace>
diff --git a/xml/ns-Microsoft.Extensions.Time.Testing.xml b/xml/ns-Microsoft.Extensions.Time.Testing.xml
index 99f4a0e6b1c..8ddeabb5917 100644
--- a/xml/ns-Microsoft.Extensions.Time.Testing.xml
+++ b/xml/ns-Microsoft.Extensions.Time.Testing.xml
@@ -1,6 +1,6 @@
 <Namespace Name="Microsoft.Extensions.Time.Testing">
   <Docs>
-    <summary>To be added.</summary>
+    <summary>Contains a class that represents a synthetic time provider that enables deterministic behavior in tests.</summary>
     <remarks>To be added.</remarks>
   </Docs>
 </Namespace>
diff --git a/xml/ns-Microsoft.Extensions.VectorData.xml b/xml/ns-Microsoft.Extensions.VectorData.xml
index 7a7875d02a2..3b824ee8290 100644
--- a/xml/ns-Microsoft.Extensions.VectorData.xml
+++ b/xml/ns-Microsoft.Extensions.VectorData.xml
@@ -1,6 +1,8 @@
 <Namespace Name="Microsoft.Extensions.VectorData">
   <Docs>
-    <summary>To be added.</summary>
+    <summary>
+      Contains classes and interfaces for vector data operations, including vector search, filtering, indexing, and mapping between storage and data models.
+    </summary>
     <remarks>To be added.</remarks>
   </Docs>
 </Namespace>
diff --git a/xml/ns-Microsoft.Extensions.WebEncoders.Testing.xml b/xml/ns-Microsoft.Extensions.WebEncoders.Testing.xml
index 0d89685b878..a56ee9ffc2e 100644
--- a/xml/ns-Microsoft.Extensions.WebEncoders.Testing.xml
+++ b/xml/ns-Microsoft.Extensions.WebEncoders.Testing.xml
@@ -1,6 +1,6 @@
 <Namespace Name="Microsoft.Extensions.WebEncoders.Testing">
   <Docs>
-    <summary>To be added.</summary>
+    <summary>Contains test HTML, JavaScript, and URL encoders for unit testing.</summary>
     <remarks>To be added.</remarks>
   </Docs>
 </Namespace>
diff --git a/xml/ns-Microsoft.Extensions.WebEncoders.xml b/xml/ns-Microsoft.Extensions.WebEncoders.xml
index f86b0ace445..ffdb81d94f6 100644
--- a/xml/ns-Microsoft.Extensions.WebEncoders.xml
+++ b/xml/ns-Microsoft.Extensions.WebEncoders.xml
@@ -1,6 +1,6 @@
 <Namespace Name="Microsoft.Extensions.WebEncoders">
   <Docs>
-    <summary>To be added.</summary>
+    <summary>Contains a class that specifies encoder options.</summary>
     <remarks>To be added.</remarks>
   </Docs>
 </Namespace>