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Title: Mirror x-mcp-header tool arguments into Mcp-Param-* request headers (SEP-2243) by Kludex · Pull Request #2990 · modelcontextprotocol/python-sdk · GitHub

Open Graph Title: Mirror x-mcp-header tool arguments into Mcp-Param-* request headers (SEP-2243) by Kludex · Pull Request #2990 · modelcontextprotocol/python-sdk

X Title: Mirror x-mcp-header tool arguments into Mcp-Param-* request headers (SEP-2243) by Kludex · Pull Request #2990 · modelcontextprotocol/python-sdk

Description: The official Python SDK for Model Context Protocol servers and clients - Mirror x-mcp-header tool arguments into Mcp-Param-* request headers (SEP-2243) by Kludex · Pull Request #2990 · modelcontextprotocol/python-sdk

Open Graph Description: What Implements client-side Mcp-Param-* header emission (SEP-2243 "Custom Headers from Tool Parameters"). The client already validated and dropped tools with malformed x-mcp-header annota...

X Description: What Implements client-side Mcp-Param-* header emission (SEP-2243 "Custom Headers from Tool Parameters"). The client already validated and dropped tools with malformed x-mcp-heade...

Opengraph URL: https://github.com/modelcontextprotocol/python-sdk/pull/2990

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Jun 26, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/2990#ref-pullrequest-4744369309
Add resolver dependency injection for MCPServer tools #2969 https://github.com/modelcontextprotocol/python-sdk/pull/2969
HTTP standard headers + x-mcp-header #2900 https://github.com/modelcontextprotocol/python-sdk/issues/2900
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Jul 9, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/2990#ref-pullrequest-4554330529
Send SEP-2243 Mcp-Method/Mcp-Name headers from the StreamableHTTP client #2730 https://github.com/modelcontextprotocol/python-sdk/pull/2730
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