fix: require metadata for modern HTTP requests - #1089
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Bump to latest stable release https://github.com/modelcontextprotocol/rust-sdk/releases/tag/rmcp-v3.1.0 ``` Added classify authorization-required errors (modelcontextprotocol/rust-sdk#1056) add strict stateless protocol metadata validation (modelcontextprotocol/rust-sdk#1091) SEP-2260 stream-based enforcement of client receive-side request association (modelcontextprotocol/rust-sdk#1055) Fixed (model) decode metadata-bearing input-required results affecting mrtr (modelcontextprotocol/rust-sdk#1097) require metadata for modern HTTP requests (modelcontextprotocol/rust-sdk#1089) honor supported_protocol_versions when negotiating initialize (modelcontextprotocol/rust-sdk#1093) Other document the ping utility with examples (modelcontextprotocol/rust-sdk#1106) complete Tier 1 feature docs and finalize roadmap (modelcontextprotocol/rust-sdk#1101) (conformance) meeting requirements for tier 1 (modelcontextprotocol/rust-sdk#1087) ``` Signed-off-by: Filinto Duran <1373693+filintod@users.noreply.github.com>
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Fixes #1086.
Motivation and Context
Modern requests are self-contained, so the HTTP protocol-version header cannot make a request valid when the corresponding body
_metais incomplete. Previously, these requests reached tool handlers and returned successful responses.Reject direct Streamable HTTP requests that select the
2026-07-28protocol through theMCP-Protocol-Versionheader but omit required request metadata. Validation now returns HTTP 400 with JSON-RPC-32602before dispatch, and regression coverage exercises directtools/list, directtools/call, and individually missing metadata fields.How Has This Been Tested?
Add tests
Both suites pass. Focused Clippy checks, including
clippy::perf, also pass for the changed targets.Breaking Changes
None.
Validation remains at the Streamable HTTP boundary so initialized legacy sessions retain their existing behavior.
clientInforemains optional for2026-07-28, matching the final specification; the tests explicitly preserve that behavior.Types of changes
Checklist