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Title: docs: SEP-2243 clarifications for x-mcp-header by mikekistler · Pull Request #2772 · modelcontextprotocol/modelcontextprotocol · GitHub

Open Graph Title: docs: SEP-2243 clarifications for x-mcp-header by mikekistler · Pull Request #2772 · modelcontextprotocol/modelcontextprotocol

X Title: docs: SEP-2243 clarifications for x-mcp-header by mikekistler · Pull Request #2772 · modelcontextprotocol/modelcontextprotocol

Description: Specification and documentation for the Model Context Protocol - docs: SEP-2243 clarifications for x-mcp-header by mikekistler · Pull Request #2772 · modelcontextprotocol/modelcontextprotocol

Open Graph Description: Summary Addresses clarification issues raised during implementation of SEP-2243 (HTTP Standardization), primarily from Go SDK implementers in #2243. Fixes #2762 Changes RFC 9110 token rule for he...

X Description: Summary Addresses clarification issues raised during implementation of SEP-2243 (HTTP Standardization), primarily from Go SDK implementers in #2243. Fixes #2762 Changes RFC 9110 token rule for he...

Opengraph URL: https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2772

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Jun 14, 2026 https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2772#ref-pullrequest-4645531250
Accept "type":"number" as a valid x-mcp-header primitive per SEP-2243 modelcontextprotocol/csharp-sdk#1647 https://github.com/modelcontextprotocol/csharp-sdk/pull/1647
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https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2772/files/23737e96734dc19f377a82637eda1181978b573c
2026-07-28-FINAL https://github.com/modelcontextprotocol/modelcontextprotocol/milestone/5
SEP-2243 Clarifications https://github.com/modelcontextprotocol/modelcontextprotocol/issues/2762
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