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Microsoft.Extensions.AI.OpenAI DeepSeek reasoning model throws HTTP 400 when using tool calls with Tool

area-aiMicrosoft.Extensions.AI librariesMicrosoft.Extensions.AI libraries

bugThis issue describes a behavior which is not expected - a bug.This issue describes a behavior which is not expected - a bug.

untriaged

Status: Open.

#7405 In dotnet/extensions;

· oudi opened on Mar 19, 2026

[MEDI] Make the IngestionChunk non-generic

area-data-ingestion

Status: Open.

#7404 In dotnet/extensions;

· adamsitnik opened on Mar 18, 2026

·  

Data Ingestion Preview 2

Thread-safety bug: LogBufferingFilterRuleSelector.Select races with InvalidateCache, causing InvalidOperationException - Collection was modified; enumeration operation may not execute

area-telemetry

bugThis issue describes a behavior which is not expected - a bug.This issue describes a behavior which is not expected - a bug.

untriaged

Status: Open.

#7383 In dotnet/extensions;

· Sorttech opened on Mar 10, 2026

Tool search and deferred loading

area-aiMicrosoft.Extensions.AI librariesMicrosoft.Extensions.AI libraries

untriaged

Status: Open.

#7371 In dotnet/extensions;

· kzu opened on Mar 7, 2026

Sending message in chat throws exception (GetStreamingResponseAsync)

area-aiMicrosoft.Extensions.AI librariesMicrosoft.Extensions.AI libraries

bugThis issue describes a behavior which is not expected - a bug.This issue describes a behavior which is not expected - a bug.

untriaged

Status: Open.

#7350 In dotnet/extensions;

· ntark opened on Mar 1, 2026

[API Proposal]: Async (Long-Running) Function Tool Support

api-suggestionEarly API idea and discussion, it is NOT ready for implementationEarly API idea and discussion, it is NOT ready for implementation

area-aiMicrosoft.Extensions.AI librariesMicrosoft.Extensions.AI libraries

waiting-author-feedback 📭The author of this issue needs to respond in order for us to continue investigating this issue.The author of this issue needs to respond in order for us to continue investigating this issue.

Status: Open.

#7344 In dotnet/extensions;

· saikir1994 opened on Feb 27, 2026

Update evaluator prompts to work with newer models since GPT-4o is slated for retirement.

area-ai-evalMicrosoft.Extensions.AI.Evaluation and relatedMicrosoft.Extensions.AI.Evaluation and related

untriaged

Status: Open.

#7341 In dotnet/extensions;

· CHR-LeeOlsen opened on Feb 25, 2026

[API Proposal]: SummarizingChatReducer to be promoted as stable

api-suggestionEarly API idea and discussion, it is NOT ready for implementationEarly API idea and discussion, it is NOT ready for implementation

area-fundamentals

untriaged

Status: Open.

#7335 In dotnet/extensions;

· mdesalvo opened on Feb 23, 2026

MemoryCache Docs Missing Details

area-aiMicrosoft.Extensions.AI librariesMicrosoft.Extensions.AI libraries

untriaged

Status: Open.

#7323 In dotnet/extensions;

· tomwarner13 opened on Feb 19, 2026

[MEDI] SemanticSimilarityChunker raising OllamaSharp.Models.Exceptions.OllamaException: the input length exceeds the context length

area-data-ingestion

bugThis issue describes a behavior which is not expected - a bug.This issue describes a behavior which is not expected - a bug.

Status: Open.

#7297 In dotnet/extensions;

· quicoli opened on Feb 13, 2026

·  

Data Ingestion Preview 2

Interface for counting tokens

area-aiMicrosoft.Extensions.AI librariesMicrosoft.Extensions.AI libraries

untriaged

Status: Open.

#7290 In dotnet/extensions;

· stephentoub opened on Feb 12, 2026

[API Proposal]: Optional tags for metric source generation

api-suggestionEarly API idea and discussion, it is NOT ready for implementationEarly API idea and discussion, it is NOT ready for implementation

area-telemetry

untriaged

Status: Open.

#7265 In dotnet/extensions;

· AndreReise opened on Feb 4, 2026