Release notes from extensions

v10.4.1

2026-03-18T21:03:33Z

This release of the Microsoft.Extensions.AI packages adds new experimental APIs for Realtime client sessions and Text-to-Speech, along with OpenTelemetry and middleware improvements.

Packages in this release

Package	Version
Microsoft.Extensions.AI.Abstractions	10.4.1
Microsoft.Extensions.AI	10.4.1
Microsoft.Extensions.AI.OpenAI	10.4.1

Experimental API Changes

New Experimental APIs

New experimental API: Realtime Client Sessions #7285 and #7399
New experimental API: Text-to-Speech Client #7381

Changes to Experimental APIs

Hosted File Download Stream: write-path methods now explicitly throw NotSupportedException #7394

What's Changed

AI

Add ITextToSpeechClient abstraction, middleware, and OpenAI implementation #7381 by @stephentoub
Realtime Client Proposal #7285 by @tarekgh
Add VoiceActivityDetection options to realtime session abstractions #7399 by @tarekgh
Make UriContent mediaType parameter optional with inference from URI file extension #7398 by @stephentoub (co-authored by @Copilot)
Emit gen_ai.client.operation.exception via ILogger LoggerMessage on OpenTelemetry instrumentation classes #7379 by @stephentoub (co-authored by @Copilot)
Support invoke_workflow as an equivalent parent span to invoke_agent in FunctionInvokingChatClient #7382 by @stephentoub (co-authored by @Copilot)
Make HostedFileDownloadStream explicitly read-only #7394 by @stephentoub (co-authored by @Copilot)

Documentation Updates

Document JSON schema derivation for return types in AIFunctionFactory #7400 by @stephentoub (co-authored by @Copilot)

Test Improvements

Fix test warnings #7369 by @jozkee
Add tests for JSON deserialization of serializable types #7373 by @stephentoub (co-authored by @Copilot)

Repository Infrastructure Updates

Update Package Validation Baseline to 10.4.0 #7389 by @jeffhandley (co-authored by @Copilot)
Update ModelContextProtocol libraries to version 1.0.0 #7340 by @stephentoub (co-authored by @Copilot)

Acknowledgements

@eiriktsarpalis @ericstj @CodeBlanch @lmolkova @adamsitnik @joperezr reviewed pull requests

Full Changelog: v10.4.0...v10.4.1

v10.4.0

2026-03-12T06:03:24Z

This release advances the AI abstractions with new hosted file, web search, and reasoning content types, stabilizes MCP and tool approval APIs, adds streaming latency metrics to OpenTelemetry instrumentation, and delivers bug fixes across caching, data ingestion, and resource monitoring.

Experimental API Changes

Now Stable

MCP Server Tool Content and Function Call Approval APIs are now stable (previously MEAI001) #7299
FakeLogCollector.GetLogsAsync(CancellationToken) is now stable (previously EXTEXP0003) #7332

New Experimental APIs

New experimental AddExtendedHttpClientLogging overloads with wrapHandlersPipeline parameter (EXTEXP0013) #7231

Removed Experimental APIs

AI Tool Reduction experimental APIs removed (was experimental under MEAI001) #7353

What's Changed

AI

Add IHostedFileClient and friends #7269 by @stephentoub
Add web search tool call content #7276 by @stephentoub (co-authored by @Copilot)
Surface OpenAI-compatible reasoning_content as TextReasoningContent #7295 by @stephentoub
MCP/Approvals/Tool Contents stabilization #7299 by @jozkee
Implement time_to_first_chunk and time_per_output_chunk streaming metrics in OpenTelemetryChatClient #7325 by @stephentoub (co-authored by @Copilot)
Add openai.api.type telemetry attribute to OpenAI IChatClient implementations #7316 by @stephentoub (co-authored by @Copilot)
Update OpenTelemetry Gen AI semantic conventions to v1.40 #7322 by @stephentoub (co-authored by @Copilot)
Fix tool definitions emission regardless of sensitivity setting #7346 by @stephentoub (co-authored by @Copilot)
Honor [Required] attribute in AI function parameter JSON schema generation #7272 by @stephentoub (co-authored by @Copilot)
AddAIContentType automatically registers content type against every base in the inheritance chain up to AIContent #7358 by @jozkee (co-authored by @Copilot)
Auto-mark server-handled FunctionCallContent as InformationalOnly #7314 by @stephentoub (co-authored by @Copilot)
Map ReasoningEffort.None and ExtraHigh to none and xhigh in OpenAI IChatClient implementations #7319 by @stephentoub (co-authored by @Copilot)
Handle DynamicMethod reflection limitations in AIFunctionFactory #7287 by @stephentoub (co-authored by @Copilot)
Fix Activity.Current nulled during streaming tool invocation #7321 by @flaviocdc (co-authored by @Copilot)
Handle FunctionCallOutputResponseItem in streaming response conversion #7307 by @stephentoub (co-authored by @Copilot)
Fix serialization of response continuation tokens #7356 by @stephentoub
Remove AI Tool Reduction experimental APIs #7353 by @stephentoub (co-authored by @Copilot)
Update OpenAI to 2.9.1 #7349 by @stephentoub

Telemetry and Observability

Introduce support for the Gauge metric type #7203 by @rainsxng
Update logging source generator to support generic methods #7331 by @svick (co-authored by @Copilot)
Update logging source generator to match runtime PR #124589 (ref readonly/params/scoped) #7333 by @svick (co-authored by @Copilot)
Promote FakeLogCollector.GetLogsAsync(CancellationToken) from experimental to stable #7332 by @Demo30
Remove obsolete CS1591 warning suppression from generated file preamble #7308 by @luissena

HTTP Resilience and Diagnostics

Expose wrapHandlersPipeline parameter in AddExtendedHttpClientLogging API #7231 by @rainsxng (co-authored by @Copilot)

Diagnostics, Health Checks, and Resource Monitoring

Add scaling to [0, 100] for LinuxUtilizationProvider #7289 by @amadeuszl

Data Ingestion

Fix infinite loop in GetPreExistingChunksIdsAsync when records exceed MaxTopCount #7311 by @adamsitnik (co-authored by @Copilot)

Caching

Fix buffer copying for HybridCachePayload. #7343 by @cincuranet

Test Improvements

Fix flaky LinuxResourceHealthCheckTests by isolating MeterListener with ReferenceEquals #7302 by @stephentoub (co-authored by @Copilot)
Fix flaky resource monitoring test #7303 by @stephentoub
Fix flaky HttpRequestBuffering_DoesNotBufferDisabledOrOversizedLogs test #7304 by @stephentoub (co-authored by @Copilot)
Fix race condition in FakeLogCollector async enumeration test #7300 by @stephentoub (co-authored by @Copilot)
Fix cgroupv1 acceptance test to explicitly register the v1 parser #7296 by @stephentoub (co-authored by @Copilot)

Repository Infrastructure Updates

Update McpServer project template to ModelContextProtocol 1.1.0 #7338 by @jeffhandley (co-authored by @Copilot)
Update aiagent-webapi template to latest Agent Framework versions (rc1/260219) #7339 by @jeffhandley (co-authored by @Copilot)
Update SDK and dotnet version to 10.0.103 #7326 by @wtgodbe
Introduce an ApiChief skill to streamline updating API baselines #7281 by @jeffhandley (co-authored by @Copilot)
Update ApiChief script to use the net10.0 artifacts #7280 by @jeffhandley
Replace Windows queue image references from vs2022preview to vs2022 in pipeline YAML #7347 by @wtgodbe (co-authored by @Copilot)
Update public pipeline pool images to fix broken builds #7292 by @joperezr
Use smaller windows.vs2022.amd64.open pool image #7298 by @joperezr
Remove main-to-dev inter-branch merge automation #7315 by @joperezr (co-authored by @Copilot)
Updating FakeLogCollector API baselines #7334 by @Demo30
Run the issue-labeler over pull requests using polling #7273 by @jeffhandley (co-authored by @Copilot)
Add npmAuthenticate task to fix npm E401 errors on CI agents #7364 by @ilonatommy (co-authored by @Copilot)
Pass sourceIndexBuildCommand through to SourceIndex #7348 by @wtgodbe
Bump qs from 6.14.1 to 6.14.2 in /src/Libraries/Microsoft.Extensions.AI.Evaluation.Reporting/TypeScript #7301
Bump rollup from 4.40.0 to 4.59.0 #7345

Acknowledgements

@luissena made their first contribution in #7308
@flaviocdc made their first contribution in #7321
@bryjen submitted issue #7271 (resolved by #7272)
@vsantele submitted issue #7306 (resolved by #7307)
@evgenyfedorov2 @eiriktsarpalis @tarekgh @ericstj @iliar-turdushev @rogerbarreto @shyamnamboodiripad @DeagleGross @MihaZupan @akoeplinger @mattleibow @rafal-mz @roji @rosebyte reviewed pull requests

Full Changelog: v10.3.0...v10.4.0

v10.3.0

2026-03-12T06:35:41Z

Experimental API Changes

Now Stable

IChatReducer interface — graduated from experimental to stable. The interface is now stable; concrete implementations (MessageCountingChatReducer, SummarizingChatReducer, ReducingChatClient) remain experimental. #7235 by @jeffhandley
FunctionCallContent and FunctionResultContent unsealed — changed from sealed class to class, enabling derivation. #7229 by @stephentoub (co-authored by @Copilot)

Breaking Changes to Experimental APIs

Experimental diagnostic ID reorganization — the blanket MEAI001 diagnostic ID was split into feature-specific constants. OpenAI-specific experimental APIs now use OPENAI001, OPENAI002, or SCME0001 instead of MEAI001. Consumers who suppressed MEAI001 for OpenAI APIs may need to suppress OPENAI001/OPENAI002 instead. #7116 by @jeffhandley (co-authored by @Copilot), #7235 by @jeffhandley

New Experimental APIs

Chat reduction implementations — MessageCountingChatReducer, SummarizingChatReducer, ReducingChatClient, and UseChatReducer builder extension. #7235 by @jeffhandley
OpenAI Responses/Assistants/Realtime/Image/Audio integrations — assigned feature-specific experimental diagnostic IDs (OPENAI001, OPENAI002). #7235 by @jeffhandley
ImageGenerationToolCallContent and ImageGenerationToolResultContent — added to JSON serialization infrastructure. #7275 by @stephentoub (co-authored by @Copilot)

What's Changed

AI

Add ReasoningOptions to ChatOptions #7252 by @stephentoub (co-authored by @Copilot)
Add LoadFromAsync and SaveToAsync helper methods to DataContent #7159 by @stephentoub (co-authored by @Copilot)
Add FunctionCallContent.InformationalOnly property #7126, #7262 by @stephentoub (co-authored by @Copilot)
Add server tool call support to OpenTelemetryChatClient per semantic conventions #7240 by @stephentoub (co-authored by @Copilot)
Add ImageGenerationToolCallContent and ImageGenerationToolResultContent to JSON serialization infrastructure #7275 by @stephentoub (co-authored by @Copilot)
Add logging to FunctionInvokingChatClient for approval flow, error handling, and loop control #7228 by @stephentoub (co-authored by @Copilot)
Allow FunctionResultContent pass-through when CallId matches #7229 by @stephentoub (co-authored by @Copilot)
Remove AIFunctionDeclaration tools on last iteration in FunctionInvokingChatClient #7207 by @stephentoub (co-authored by @Copilot)
Propagate CachedInputTokenCount in OpenTelemetry telemetry #7234 by @stephentoub (co-authored by @Copilot)
Categorize MEAI001 experimental APIs #7116 by @jeffhandley (co-authored by @Copilot)
MEAI: Update Experimental / Preview Features #7235 by @jeffhandley
ToChatResponse: Merge AdditionalProperties into ChatMessage instead of ChatResponse #7194 by @stephentoub (co-authored by @Copilot)
Fix FunctionInvokingChatClient to respect ChatOptions.Tools modifications by function tools #7218 by @stephentoub (co-authored by @Copilot)
Fix FunctionInvokingChatClient invoke_agent span detection with exact match or space delimiter #7224 by @stephentoub (co-authored by @Copilot)
Fix approval request/response correlation in FunctionInvokingChatClient #7261 by @stephentoub (co-authored by @Copilot)
Fix DataUriParser to default to text/plain;charset=US-ASCII per RFC 2397 #7247 by @stephentoub (co-authored by @Copilot)
Fix NRT resolution for AIFunction parameters #7200 by @eiriktsarpalis
Preserve extra JSON schema properties in ToolJson serialization #7250 by @stephentoub (co-authored by @Copilot)
Fix token metric unit to use UCUM format {token} #7241 by @stephentoub
Fix OpenAI responses streaming to preserve encrypted reasoning content #7266 by @stephentoub
Update OpenAIResponsesChatClient to handle streaming code interpreter content #7267 by @stephentoub

Diagnostics, Health Checks, and Resource Monitoring

[5752] FakeLogCollector waiting capabilities #6228 by @Demo30
Bring new cpu.requests formula from Kubernetes #7239 by @amadeuszl

Service Discovery

Fix deadlock in ServiceEndpointWatcher when disposing change token registration #7255 by @ReubenBond

Compliance, Redaction, and Data Classification

Add Ordinal into ordering #7225 by @cincuranet

AI Evaluation

Escape the JSON data before embedding in Evaluation reports #7238 by @peterwald

Documentation Updates

Update AI changelogs #7206 by @stephentoub
Remove unnecessary description tags #7226 by @gewarren
Update M.E.AI changelogs with recent changes #7242 by @stephentoub
Update OpenTelemetry semantic convention version references from 1.38 to 1.39 #7274 by @tarekgh (co-authored by @Copilot)

Test Improvements

Fix race condition in UnreliableL2Tests.WriteFailureInvisible #7075 by @stephentoub (co-authored by @Copilot)

Repository Infrastructure Updates

Add .npmrc next to package.json and add lockfile for PublishAIEvaluationReport #7108 by @akoeplinger
Set Microsoft.McpServer.ProjectTemplates version to align with MCP packages #7170 by @jeffhandley
Enable package validation for M.E.AmbientMetadata.Build #7213 by @evgenyfedorov2
Set network isolation policy for extensions-ci #7221 by @wtgodbe
Update mcpserver template to ModelContextProtocol 0.7.0-preview.1 #7236 by @jeffhandley (co-authored by @Copilot)
Update aiagent-webapi template to Agent Framework 1.0.0-preview.260127.1 #7237 by @jeffhandley (co-authored by @Copilot)
Bump js-yaml from 4.1.0 to 4.1.1 in /src/Libraries/Microsoft.Extensions.AI.Evaluation.Reporting/TypeScript #7054
Bump validator from 13.15.20 to 13.15.23 in /src/Libraries/Microsoft.Extensions.AI.Evaluation.Reporting/TypeScript #7103
Bump qs from 6.14.0 to 6.14.1 in /src/Libraries/Microsoft.Extensions.AI.Evaluation.Reporting/TypeScript #7189
Bump mdast-util-to-hast from 13.2.0 to 13.2.1 in /src/Libraries/Microsoft.Extensions.AI.Evaluation.Reporting/TypeScript #7198
Bump lodash from 4.17.21 to 4.17.23 in /src/Libraries/Microsoft.Extensions.AI.Evaluation.Reporting/TypeScript #7227

Acknowledgements

@cincuranet made their first contribution in #7225
@ReubenBond made their first contribution in #7255
@Demo30 submitted issue #5752 (resolved by #6228)
@peterwald submitted a fix for evaluation report XSS vulnerability in #7238
@amadeuszl submitted a fix for Kubernetes cpu.requests formula in #7239
@rainsxng submitted issue #7231 (note: merged after this release)
@eiriktsarpalis @tarekgh @gewarren @akoeplinger @evgenyfedorov2 @wtgodbe reviewed pull requests

Full Changelog: v10.2.0...v10.3.0

v10.2.0

2026-01-13T19:43:13Z

What's Changed

Bump version to 10.2.0 for next development cycle by @Copilot in #7105
Add unit parameter to metric source generator by @mariamgerges in #7099
[main] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in #7111
Fix expected conversation length in SummarizingChatReducer integration tests by @MackinnonBuck in #7119
Fix build status badge in README.md by @akoeplinger in #7118
Update AI changelogs for 10.1.0 by @stephentoub in #7123
Merging internal changes into release/10.1 branch by @joperezr in #7127
Bump glob from 11.0.1 to 11.1.0 in /src/Libraries/Microsoft.Extensions.AI.Evaluation.Reporting/TypeScript by @dependabot[bot] in #7052
Fix markdown parser crash on inline HTML elements by @Copilot in #7131
Fix IndexOutOfRangeException when parsing markdown tables without trailing pipes by @Copilot in #7133
Merging changes from release/10.1 into main by @joperezr in #7128
Remove nuget.exe by @ericstj in #7138
Augment UsageDetails with cached / reasoning token counts by @stephentoub in #7122
Expose ctors for setting AdditionalProperties on Hosted tools by @stephentoub in #7120
Update to OpenAI 2.8.0 by @stephentoub in #7136
Add DocumentTokenChunker by @KrystofS in #7093
Skip tests by default in internal rolling builds by @Copilot in #7151
Fix FunctionApprovalResponseContent to message mapping by @PederHP in #7152
[main] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in #7155
Add support for custom headers in HostedMcpServerTool by @echapmanFromBunnings in #7053
AmbientMetadata.Build - release to GA by @evgenyfedorov2 in #7161
Overhaul project template builds and testing by @jeffhandley in #7113
Update Microsoft.Agents.AI.ProjectTemplates to latest Agent Framework by @jeffhandley in #7167
Introduce local vs. remote mcpserver template option by @jeffhandley in #7168
Fix rolling build pipeline by @jeffhandley in #7171
Add Reason property to FunctionApprovalResponseContent for custom rejection messages by @Copilot in #7140
[main] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in #7180
Fix ToChatResponse to use first appropriate CreatedAt instead of last by @Copilot in #7193
Add support for InputImageUrl via reflection in OpenAIResponsesChatClient by @Copilot in #7195

New Contributors

@mariamgerges made their first contribution in #7099
@akoeplinger made their first contribution in #7118
@PederHP made their first contribution in #7152
@echapmanFromBunnings made their first contribution in #7053

Full Changelog: v10.1...v10.2.0

v10.1.0

2025-12-10T22:48:20Z

What's Changed

[MEDI] start producing NuGet packages by @adamsitnik in #7016
Deprecate AddServiceLogEnricher method with its overloads, introduce replacements by @evgenyfedorov2 in #6529
Update version numbers in AI changelogs by @stephentoub in #7008
HttpDependencyMetadataResolver class for the custom downstream dependency metadata resolution by @rainsxng in #6880
[MEDI] Don't stop document processing on enricher error by @adamsitnik in #7005
[MEDI] add PackageTags by @adamsitnik in #7022
Add a new Microsoft.Agents.AI.Templates package with an aiagent-webapi project template by @jeffhandley in #7014
Add MarkItDownMcpReader for MCP server support by @Copilot in #7025
Image generation tool by @ericstj in #6749
Make MEAI packages use 10.0 runtime packages by @ericstj in #7028
When using latest .NET packages, force System.Numerics.Tensors to 10.0 (for MEAI) by @jeffhandley in #7031
[main] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in #7032
Use DataContent from Microsoft.Extensions.AI for data URI generation by @Copilot in #7027
Add AmbientMetadata.Build component by @evgenyfedorov2 in #6623
Introduce SectionChunker by @KrystofS in #7015
Use Microsoft.Extensions.DataIngestion in AI Chat Web template by @MackinnonBuck in #7023
Add Agent Framework DevUI into the aiagent-webapi template by @jeffhandley in #7026
Adjust cgroupv2 drive format check for .NET 10 and higher by @KeterSCP in #6877
Replace custom IAsyncEnumerable extensions with System.Linq.AsyncEnumerable by @Copilot in #7039
Add Image Detail support for Image DataContent to OpenAIResponsesChatClient. by @rogerbarreto in #7042
[main] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in #7043
Update to OpenAI 2.7.0 by @stephentoub in #7044
Merge changes from internal by @joperezr in #7038
Merge rel10 by @joperezr in #7047
Disable AzDO dependabot by @mmitche in #7045
Bump version to 10.1.0 for next development cycle by @Copilot in #7018
Update AI Chat Web template to Aspire 13.0.0 by @Copilot in #7036
Fix flaky SetupSequence tests by @amadeuszl in #7051
Update AI changelogs by @stephentoub in #7037
Update project template dependencies by @jeffhandley in #7064
Reset Microsoft.Agents.AI.ProjectTemplates versioning by @jeffhandley in #7034
Fix operator precedence bug in ValidateSchemaDocument causing rejection of valid boolean schemas by @Copilot in #7066
Use JsonElement.Parse for JsonElement conversions in AI libraries by @Copilot in #7067
.NET: Change type of ContinuationToken properties by @SergeyMenshykh in #7050
Fix OpenAIEmbeddingGenerator to handle missing usage data by @stephentoub in #7074
Add AIJsonSchemaCreateOptions.ParameterDescriptions by @stephentoub in #7068
Improve FunctionInvokingChatClient's awareness of agents by @stephentoub in #7030
Add Kubernetes based Resource Monitoring by @amadeuszl in #6748
Ensure all ResponseItems are yielded in AIContent by @crickman in #7063
Add CHANGELOG.md files for Microsoft.Extensions.DataIngestion* projects by @Copilot in #7072
Assign authors only on PR creation by @sebastienros in #7083
Update to .NET 10 GA release by @Copilot in #7078
Fix package references from M.E.AI packages by @stephentoub in #7076
Workaround OpenAI bug with streaming error events by @stephentoub in #7085
Update AI changelogs for 10.0.1 release by @stephentoub in #7086
Add metering for baseline resource quotas by @amadeuszl in #7080
Update Microsoft.VisualStudio.Threading.Analyzers to latest by @stephentoub in #7091
Update SonarAnalyzer.CSharp to latest by @stephentoub in #7092
Remove Microsoft.Extensions.AI.AzureAIInference by @stephentoub in #7096
DisableParallelization for environment variables based tests by @amadeuszl in #7100
Remove AzureAIInference remnants after #7096 by @Copilot in #7102
Update resource management configuration by @sebastienros in #7084

New Contributors

@KeterSCP made their first contribution in #6877
@crickman made their first contribution in #7063

Full Changelog: v10.0.0...v10.1

v10.0.0

2025-11-11T23:01:50Z

What's Changed

Give FunctionInvokingChatClient span a more OTELy name by @verdie-g in #6911
Update repository branding from 9.10 to 10.0 by @Copilot in #6907
Clean up local function names in AIFunctionFactory by @Copilot in #6909
Update OpenTelemetryChatClient to output data on all tools by @stephentoub in #6906
Update ToChatResponse{Async} to also factor in AuthorName by @stephentoub in #6910
add support for background responses by @SergeyMenshykh in #6854
Fix METGEN004 error message: print return type in ErrorInvalidMethodReturnType by @eduherminio in #6905
Fix OpenTelemetryChatClient failing on unknown content types by @stephentoub in #6915
Add support for Connector ID and other follow ups by @jozkee in #6881
Update AI lib changelogs by @stephentoub in #6920
Merge internal changes by @joperezr in #6921
Add Workstream, Stage, and PackageValidationBaselineVersion metadata to ServiceDiscovery libraries by @Copilot in #6919
Add back Uri ctor to HostedMcpServerTool by @jozkee in #6926
Set DisableNETStandardCompatErrors in ServiceDiscovery libraries by @eerhardt in #6927
Update Package validation baseline version to 9.10.0 by @Copilot in #6922
[main] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in #6802
Extend service discovery to support Consul-based DNS lookups: by @bart-vmware in #6914
Update AsOpenAIResponseItems to roundtrip User AIContent ResponseItems by @stephentoub in #6931
Special-case AIContent returned from AIFunctionFactory.Create AIFunctions to not be serialized by @stephentoub in #6935
Preserve function content in SummarizingChatReducer by @MackinnonBuck in #6908
Tool reduction by @MackinnonBuck in #6781
Fix coalescing of TextReasoningContent with ProtectedData by @stephentoub in #6936
Doc updates by @gewarren in #6930
Support DisplayNameAttribute for name resolution in AI libraries by @Copilot in #6942
Fix EquivalenceEvaluator MaxOutputTokens to meet Azure OpenAI minimum requirement by @Copilot in #6948
Support DefaultValueAttribute in AIFunctionFactory parameter handling by @Copilot in #6947
Bump vite from 6.3.6 to 6.4.1 in /src/Libraries/Microsoft.Extensions.AI.Evaluation.Reporting/TypeScript by @dependabot[bot] in #6938
Introduce Microsoft.Extensions.DataIngestion.Abstractions by @adamsitnik in #6949
Update to latest schema version (accepted by MCP registry) by @joelverhagen in #6956
Introduce IngestionChunkWriter build on top of MEVD by @adamsitnik in #6951
Update AI Chat Web dependencies by @MackinnonBuck in #6955
Add AITool -> OpenAI.Responses.ResponseTool conversion utility by @rogerbarreto in #6958
Update AI changelogs for 9.10.1 by @stephentoub in #6950
Add Name property to OtelMessage to store ChatMessage.AuthorName per OpenTelemetry semantic conventions by @Copilot in #6953
Fix serialization of UserInputRequest/ResponseContent by @stephentoub in #6962
Expose building blocks for external service discovery implementations by @bart-vmware in #6946
Bump validator from 13.15.0 to 13.15.20 in /src/Libraries/Microsoft.Extensions.AI.Evaluation.Reporting/TypeScript by @dependabot[bot] in #6974
Add eng/sdl-tsa-vars.config for TSA integration by @Copilot in #6980
Add CodeInterpreterToolCall/ResultContent content types by @stephentoub in #6964
Update to 1.38 of the otel genai standard convention by @stephentoub in #6981
Introduce set of built-in Enrichers by @adamsitnik in #6957
Allow ChatOptions.ConversationId to be an OpenAI conversation ID with Responses by @stephentoub in #6960
Fix warning breaking official build, enable warningAsError in all pipelines by @ericstj in #6988
Introduce HeaderChunker by @adamsitnik in #6979
Introduce Markdown readers by @adamsitnik in #6969
Add usage telemetry for aieval dotnet tool by @shyamnamboodiripad in #6773
Update to OpenAI 2.6.0 by @stephentoub in #6996
Don't specify MaxOutputTokens for EquivalenceEvaluator by @shyamnamboodiripad in #7006
Fix Assert.Throws to validate parameter names by @stephentoub in #7007
[MEDI] Remove collection key type workaround by @adamsitnik in #7010
Enable binskim to extract packages by @ericstj in #6989
Added net10.0 targeting to all packages and flowed RC2 dependency versions. by @joperezr in #6995
[MEDI] Pipeline by @adamsitnik in #6993
Add Semantic Similarity chunker by @KrystofS in #6994

New Contributors

@SergeyMenshykh made their first contribution in #6854
@bart-vmware made their first contribution in #6914

Full Changelog: v9.10.0...v10.0.0

v9.10.0

2025-10-15T02:24:24Z

What's Changed

Branding updates for 9.10 by @Copilot in #6769
Doc improvements by @gewarren in #6794
Bump vite from 6.3.5 to 6.3.6 in /src/Libraries/Microsoft.Extensions.AI.Evaluation.Reporting/TypeScript by @dependabot[bot] in #6793
Updated changelogs for AI libs by @stephentoub in #6787
Update MCP server template by @jeffkl in #6772
Add support for using ConversationID for AzureOpenAI and OpenAI by @ViveliDuCh in #6770
Merging internal commits by @joperezr in #6801
Merge changes from release/9.9 branch by @joperezr in #6803
Support keyed HybridCache with keyed DistributedCaches and named options by @kelly-yinn in #6694
Inventory as code by @wtgodbe in #6820
Increase output token limit for EquivalenceEvaluator by @shyamnamboodiripad in #6835
Fix KeyNotFoundException on HttpRequestLatencyListener.OnEventWritten for uknown event sources by @ssmelov in #6821
Add project name normalization to match aspire's code generator logic by @ViveliDuCh in #6818
Disable really noisy analyzers, part 1 by @stephentoub in #6837
Fix KeyNotFoundException in HttpRequestLatencyListener.OnEventWritten by @pentp in #6823
Update global.json to use .NET 9.0.0 stable instead of RC 1 by @Copilot in #6846
Add measures and tags with mediator object to the HttpClientLatencyLogEnricher by @rainsxng in #6783
Add comprehensive .github/copilot-instructions.md for dotnet/extensions repository by @Copilot in #6792
Update to .NET 10 SDK by @eerhardt in #6863
Update Microsoft.Extensions.AI changelog files with current NuGet versions by @Copilot in #6849
Fix GenerateImagesAsync_SingleImageGeneration integration test by @stephentoub in #6843
Re-enable IDE0032 by @stephentoub in #6866
Add OpenTelemetrySpeechToTextClient and friends by @stephentoub in #6845
Update ModelContextProtocol version in MCP template by @MackinnonBuck in #6870
Scope Ollama resilience settings to Web/Program.cs and restore ServiceDefaults by @ViveliDuCh in #6850
Update Aspire by @Varorbc in #6858
Update MCP template for new registry specification by @Copilot in #6796
Add support for HostApplicationBuilder in AmbientMetadata extension by @eduherminio in #6867
Fix mcpserver test baselines by @jeffhandley in #6874
Move Microsoft.Extensions.ServiceDiscovery to dotnet/extensions by @eerhardt in #6868
Add copy constructors to option types (ChatOptions, etc.) by @stephentoub in #6882
Fix ChatMessage.CreatedAt being always overwritten by the latest timestamp. by @Copilot in #6885
Small doc fixes by @gewarren in #6887
Update AI changelogs with some recent additions by @stephentoub in #6886
Fix Assistants IChatClient handling of unrelated tool calls in history by @stephentoub in #6891
Fix duplication between OpenAI Assistants pre-configured tools by @stephentoub in #6896
Update MCP Server Template to adhere to 2025-09-29 server.json schema by @joelverhagen in #6888
Remove Azure.AI.OpenAI dependency from templates and tests by @Copilot in #6873
Remove UnsafeRelaxedJsonEscaping by @peterwald in #6899
Fix bug to yield remaining buffered FCC by @westey-m in #6903
Fix serialization of [Experimental] AIContent-derived types by @stephentoub in #6900

New Contributors

@westey-m made their first contribution in #6745
@jeffkl made their first contribution in #6772
@ViveliDuCh made their first contribution in #6770
@kelly-yinn made their first contribution in #6694
@ssmelov made their first contribution in #6821
@Varorbc made their first contribution in #6858

Full Changelog: v9.9.0...v9.10.0

v9.9.0

2025-09-09T20:51:23Z

Highlights

AI

Abstractions for remote MCP servers; response/approval flow support via new experimental types
Function approvals via new experimental types (e.g., ApprovalRequiredAIFunction, user input/approval request & response content).
Reasoning text streaming for OpenAI Responses ChatClient streaming.
AIFunction split into a base class to improve extensibility.
IChatReducer moved to Microsoft.Extensions.AI.Abstractions.
Updated to OpenAI 2.4.0 and genai standard convention 1.37.
Coalescing logic now treats ChatMessage.Role changes as new messages.
GetResponseAsync<T> now reads only the last message (bug fix).
OpenTelemetry ChatClient/EmbeddingGenerator logs raw additional properties (no key mangling).
Fixed empty annotated text chunk handling in streaming with OpenAI Assistants.

Telemetry & Diagnostics

HTTP diagnostics log query string params with proper redaction (emitted on url.query).
server.address telemetry emits host only (per OpenTelemetry semantic conventions).
Heuristics added to detect well-known model hosts.
Resource monitoring can consider Environment.CpuUsage.

New Contributors

@ykumashev made their first contribution in #6696

Full Changelog: v9.8.0...v9.9.0

v9.8.0

2025-08-14T02:01:15Z

What's Changed

Align EventId generation with M.E.Logging source-gen by @xakep139 in #6566
Add resiliency mechanism to CPU and memory utilization checks by @amadeuszl in #6528
Suppress flaky test until fixed by @joelverhagen in #6568
Create a project template for an MCP server by @joelverhagen in #6547
Use dnx instead of dotnet tool exec in MCP server template README by @joelverhagen in #6571
Add reporting tests that show NLP results. by @peterwald in #6574
Branding updates for 9.8.0 by @joperezr in #6573
Fix ConfigureEvaluationTests.ps1 script when $ConfigRoot is not supplied by @peterwald in #6575
Refactor Resource Monitoring by @evgenyfedorov2 in #6554
Update McpServer template for 0.3.0-preview.2 by @stephentoub in #6578
Add container.cpu.time metric by @evgenyfedorov2 in #5806
Add netstandard2.0 compatibility to Microsoft.Extensions.Diagnostics.Testing and dependencies by @bdovaz in #6219
Add netstandard2.0 compatibility to Microsoft.Extensions.Telemetry and dependencies by @bdovaz in #6218
Simplify Http.Diagnostics by @pentp in #6174
Add netstandard2.0 compatibility to Microsoft.Extensions.Http.Resilience and dependencies by @bdovaz in #6582
Ingore null loggers returned by LogProviders in ELoggerFactory by @petrroll in #6585
Merging changes from internal by @joperezr in #6588
[Logging] Fixes LogProperties and LogPropertyIgnore attributes to work if an object being logged resides in a different assembly than the logging method by @iliar-turdushev in #6600
Add memory usage metric by @evgenyfedorov2 in #6586
Add schema version to server.json in MCP template by @joelverhagen in #6606
Merge release/9.7 into main by @joperezr in #6589
Update MCP server template readme to show both VS Code and Visual Studio notes by @Copilot in #6591
Update Azure Open AI package referenced by eval integration tests by @shyamnamboodiripad in #6609
Target .NET 8 for more stable runtime requirement by @joelverhagen in #6617
Add support for new Azure AI Foundry project type for Safety evals by @shyamnamboodiripad in #6621
M.E.AI.AzureAIInference - Azure.AI.Inference Package Bump by @rogerbarreto in #6624
Add DataContent.Name property by @stephentoub in #6616
Fix handling of multiple responses messages by @stephentoub in #6627
Expose additional chat model conversion helpers by @stephentoub in #6629
[main] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in #6633
[Http.Resilience] The DisableFor method should try to retrieve the request object from the resilience context by @iliar-turdushev in #6618
Bump Package validation baseline version to 9.7.0 by @Copilot in #6650
Fix internal package version detection for project templates by @MackinnonBuck in #6651
Remove Microsoft.Extensions.AI.Ollama by @MackinnonBuck in #6655
Fix M.E.AI package refs by @stephentoub in #6654
Add [Description] to DataContent.Uri by @stephentoub in #6615
Fix duplicate solution file when creating an AI Chat Web app from VS by @MackinnonBuck in #6653
Add ChatMessage.CreatedAt by @stephentoub in #6657
Add TextContent.Annotations by @stephentoub in #6619
Add FunctionInvokingChatClient.AdditionalTools by @stephentoub in #6661
Fix unintentional test env var change by @stephentoub in #6660
Add more openai conversion helpers by @stephentoub in #6662
Add OriginalRepoCommitHash to assemblies by @BrennanConroy in #6667
Include a trivial items keyword if missing. by @eiriktsarpalis in #6669
Add resolution of function parameter level data annotation attributes. by @eiriktsarpalis in #6671
Fix issue with NetSourceIndexStage1 for dependency conflict versions by @joperezr in #6672
Expose streaming conversion utility methods by @stephentoub in #6636
Couple of fixes for MEAI.Evaluation by @shyamnamboodiripad in #6673
Fix one more version conflict on the docs transport package by @joperezr in #6675
Introduce metadata to identify built-in evaluation metrics by @shyamnamboodiripad in #6674
[main] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] in #6679
Emit {OriginalFormat} in HttpClient logger by @iliar-turdushev in #6682
Update to OpenAI 2.3.0 by @stephentoub in #6684
Remove AdjustTime from experimental by @amadeuszl in #6668
Allow custom filtering logic for FakeLogger by @Demo30 in #5848
Mark packages as stable and update to .NET Servicing versions by @joperezr in #6700
[release/9.8] Backport several AI-related PRs by @stephentoub in #6703
[release/9.8] Update Azure.AI.OpenAI by @github-actions[bot] in #6710
[release/9.8] Add support for text-to-image by @ericstj in #6711
[release/9.8] Use Azure hosting integrations in Aspire AI Chat Web template by @MackinnonBuck in #6712
[release/9.8] Add middleware for reducing chat history by @github-actions[bot] in #6713

New Contributors

@joelverhagen made their first contribution in #6568
@bdovaz made their first contribution in #6219
@petrroll made their first contribution in #6585

Full Changelog: v9.7.0...v9.8.0

v9.7.2

2025-07-17T06:59:32Z

Packages Released

Microsoft.Extensions.AI.Templates 9.7.2-preview.3.25366.2

What's Changed

Target .NET 8 for more stable runtime requirement by @joelverhagen in #6617

Full Changelog: v9.7.1...v9.7.2