.NET: feat: add context provider message merge hook#6303
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Pull request overview
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Adds an overridable message-merging hook so derived context providers can control how provided context messages are combined with user/input messages (e.g., prepend vs append), with unit tests validating prepend behavior.
Changes:
- Introduce
MergeMessages(...)as aprotected virtualextension point inAIContextProviderand route message merging through it. - Update
MessageAIContextProviderto useMergeMessages(...)during invocation. - Add unit tests demonstrating overriding
MergeMessages(...)to prepend provider messages.
Reviewed changes
Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.
| File | Description |
|---|---|
| dotnet/src/Microsoft.Agents.AI.Abstractions/AIContextProvider.cs | Adds MergeMessages hook and uses it when combining input/provided messages. |
| dotnet/src/Microsoft.Agents.AI.Abstractions/MessageAIContextProvider.cs | Switches from direct Concat to MergeMessages for message combination. |
| dotnet/tests/Microsoft.Agents.AI.Abstractions.UnitTests/AIContextProviderTests.cs | Adds test coverage for overriding merge behavior to prepend provided messages. |
| dotnet/tests/Microsoft.Agents.AI.Abstractions.UnitTests/MessageAIContextProviderTests.cs | Adds test coverage for overriding merge behavior to prepend provided messages. |
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Adds a protected virtual
MergeMessageshook for AI context providers so implementations can customize where provided messages are placed relative to input messages without reimplementing filtering and source attribution.Summary:
AIContextProvider.MergeMessages(...)with the existing append behavior as the default.MessageAIContextProviderto use the inherited merge hook after source attribution.Validation:
dotnet build src/Microsoft.Agents.AI.Abstractions/Microsoft.Agents.AI.Abstractions.csprojdotnet test --project tests/Microsoft.Agents.AI.Abstractions.UnitTests/(net10.0 passed; net472 runner requires mono on Linux)dotnet test --project tests/Microsoft.Agents.AI.UnitTests/Microsoft.Agents.AI.UnitTests.csproj(net10.0 passed; net472 runner requires mono on Linux)