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Title: fix(SEP-2575): introduce a custom error code for unsupported protocol error by yarolegovich · Pull Request #2716 · modelcontextprotocol/modelcontextprotocol · GitHub

Open Graph Title: fix(SEP-2575): introduce a custom error code for unsupported protocol error by yarolegovich · Pull Request #2716 · modelcontextprotocol/modelcontextprotocol

X Title: fix(SEP-2575): introduce a custom error code for unsupported protocol error by yarolegovich · Pull Request #2716 · modelcontextprotocol/modelcontextprotocol

Description: Specification and documentation for the Model Context Protocol - fix(SEP-2575): introduce a custom error code for unsupported protocol error by yarolegovich · Pull Request #2716 · modelcontextprotocol/modelcontextprotocol

Open Graph Description: A small correction suggestion for the SEP-2575. Introduce a custom jsonrpc error code for disambiguating UnsupportedProtocolVersionError. The original comment likely got lost and was left addressed.

X Description: A small correction suggestion for the SEP-2575. Introduce a custom jsonrpc error code for disambiguating UnsupportedProtocolVersionError. The original comment likely got lost and was left addressed.

Opengraph URL: https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2716

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introduce a custom error code for unsupport protocol errorhttps://github.com/modelcontextprotocol/modelcontextprotocol/pull/2716/commits/6b22bfbe031e30a0dda58559b37e4debb1b57972
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May 15, 2026 https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2716#ref-pullrequest-4454897768
Disambiguate HTTP backward-compat fallbacks: inspect 400/404 body before falling back #2727 https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2727
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Define error code allocation policy and renumber draft error codes #2907 https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2907
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