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Preserve per-request client capability extensions when the session declares its own - #1921
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…clares its own InjectRequestMeta overlaid the session capabilities onto the request's _meta.clientCapabilities one top-level key at a time, so a session that declares any extension replaced the request's whole "extensions" object and dropped the io.modelcontextprotocol/tasks opt-in added by CallToolAsTaskAsync. Merge JSON objects recursively instead. Fixes modelcontextprotocol#1920 Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Fixes #1920
Problem
On the 2026-07-28 revision,
McpSessionHandler.InjectRequestMetaoverlays the session capabilities onto the request's_meta.clientCapabilitiesone top-level key at a time. When the session declares any extension, itsextensionsobject replaces the request's. That drops the per-requestio.modelcontextprotocol/tasksopt-in added byCallToolAsTaskAsync, and the server answers synchronously.Change
MergeJsonObject). A key present only on the request survives, and the session's values still win where both sides set the same key.McpClientTaskMethodsTests.CallToolAsTaskAsync_WithSessionLevelExtensions_StillReturnsCreatedTask. It fails without the fix.Testing
dotnet buildsucceeds with 0 warnings.ModelContextProtocol.Tests(net10.0): 2391 passed, 6 skipped.ModelContextProtocol.AspNetCore.Tests(net10.0): 623 passed, 42 skipped.Note
This pull request was AI-generated (Claude Code).