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Add initialize request metadata support#1046

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smf-h wants to merge 1 commit into
modelcontextprotocol:mainfrom
smf-h:ix-initialize-request-meta
Open

Add initialize request metadata support#1046
smf-h wants to merge 1 commit into
modelcontextprotocol:mainfrom
smf-h:ix-initialize-request-meta

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@smf-h

@smf-h smf-h commented Jun 29, 2026

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Summary

  • add optional _meta support for MCP initialize requests
  • expose initialize-request metadata on async and sync client builders
  • propagate metadata through lifecycle initialization while defensively copying user-provided maps

Validation

  • .\mvnw.cmd -pl mcp-core "-Dtest=LifecycleInitializerTests,McpAsyncClientTest,McpSyncClientTest" test
  • Result: BUILD SUCCESS; Tests run: 37, Failures: 0, Errors: 0, Skipped: 0

Fixes #940

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McpClient should allow passing _meta in InitializeRequest

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