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- Transports need to list a context's entries and combine contexts, for instance to add the decoded Mcp-Param-* headers to a context built by a user-provided extractor. - This introduces a way to merge McpTransportContext. To do so, it introduces a way to read entries from the contexts, by key-value. - This change is non-breaking but custom implementations of McpTransportContext used in the modern server MUST implement stream(). The implementation is inspired from Reactor's Context. Signed-off-by: Daniel Garnier-Moiroux <git@garnier.wf>
- Tools can mark inputSchema arguments with x-mcp-header, so clients
mirror them into Mcp-Param-{Name} headers. Servers MUST reject a
request whose headers and body disagree, with 400 / -32020.
- Since only tools/call use those header, they are not part of the
McpRequestHandler interface, and rather are carried through the
McpTransportContext.
- The HTTP transport extracts and decodes Mcp-Param-* headers and puts
them in the context. STDIO puts a marker "not mirrored" value instead.
- Validation happens in ToolsFeature, where we have both the tool
definition (including x-mcp-header annotations in the schema) and the
values for the tool call.
- McpHeaderDecoder and McpParamHeaders are public, so other HTTP
transports can reuse them.
- Mcp-Name now uses the same strict decoder.
Signed-off-by: Daniel Garnier-Moiroux <git@garnier.wf>
Kehrlann
changed the base branch from
dgarnier/merge-mcp-transport-contexts
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main
October 31, 2026 15:24
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Closes #1199