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ROADMAP.md

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RMCP Roadmap

This roadmap tracks the path to SEP-1730 Tier 1 for the Rust MCP SDK.

Server conformance: 87.5% (28/32) · Client conformance: 80.0% (16/20)

Tier 2 → Tier 1

Conformance

Server (87.5% → 100%)

  • Fix prompts-get-with-args — prompt argument handling returns incorrect result (arg1/arg2 not substituted)
  • Fix prompts-get-embedded-resource — embedded resource content in prompt responses (invalid content union)
  • Fix elicitation-sep1330-enums — enum inference handling per SEP-1330 (missing enumNames for legacy titled enum)
  • Fix dns-rebinding-protection — validate Host / Origin headers on Streamable HTTP transport (accepts invalid headers with 200)

Client (80.0% → 100%)

  • Fix auth/metadata-var3 — AS metadata discovery variant 3 (no authorization support detected)
  • Fix auth/scope-from-www-authenticate — use scope parameter from WWW-Authenticate header on 403 insufficient_scope
  • Fix auth/scope-step-up — handle 403 insufficient_scope and re-authorize with upgraded scopes
  • Fix auth/2025-03-26-oauth-endpoint-fallback — legacy OAuth endpoint fallback for pre-2025-06-18 servers (no authorization support detected)

Governance & Policy

  • Create VERSIONING.md — document semver scheme, what constitutes a breaking change, and how breaking changes are communicated

Documentation (26/48 → 48/48 features with prose + examples)

Undocumented features (14)

  • Tools — image results
  • Tools — audio results
  • Tools — embedded resources
  • Prompts — embedded resources
  • Prompts — image content
  • Elicitation — URL mode
  • Elicitation — default values
  • Elicitation — complete notification
  • Ping
  • SSE transport — legacy (client)
  • SSE transport — legacy (server)
  • Pagination
  • Protocol version negotiation
  • JSON Schema 2020-12 support (upgrade from partial)

Partially documented features (7)

  • Tools — error handling (add dedicated prose + example)
  • Resources — reading binary (add dedicated example)
  • Elicitation — form mode (add prose docs, not just example README)
  • Elicitation — schema validation (add prose docs)
  • Elicitation — enum values (add prose docs)
  • Capability negotiation (add dedicated prose explaining the builder API)
  • Protocol version negotiation (document version negotiation behavior)

Informational (not scored for tiering)

These draft/extension scenarios are tracked but do not count toward tier advancement:

Scenario Tag Status
auth/resource-mismatch draft ❌ Failed
auth/client-credentials-jwt extension ❌ Failed — JWT aud claim verification error
auth/client-credentials-basic extension ✅ Passed
auth/cross-app-access-complete-flow extension ❌ Failed — sends authorization_code grant instead of jwt-bearer