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Remove confusing "reserved by MCP" language and clearly specify what keys are actually reserved: - progressToken (for backwards compatibility) - Keys with modelcontextprotocol.* or mcp.* prefixes All other keys are available for arbitrary use by implementations. Fixes #264
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I think this is minor enough to not require a SEP? But happy to raise one if needed. |
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This feels like it materially changes the interpretation of |
…elcontextprotocol prefix - Use reverse DNS notation (io.modelcontextprotocol instead of modelcontextprotocol.io) - Only reserve io.modelcontextprotocol prefix (removed mcp.* reservation) - Add SHOULD recommendation for implementations to use reverse DNS - Update examples to demonstrate reverse DNS pattern - Only modify draft specification (revert 2025-06-18 changes) Aligns with SEP proposal for _meta clarification.
Resolved conflicts by: - Keeping both _meta Reserved Keys documentation and icons documentation in index.mdx - Using origin/main's progressToken comment in schema.ts - Regenerating schema.json and schema.mdx from the corrected schema.ts
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Summary
_metaproperty documentationprogressToken(backwards compatibility) and keys withmodelcontextprotocol.*ormcp.*prefixesThis resolves the documentation ambiguity raised in the issue where "reserved" was used in conflicting ways.
Fixes #264