Rust SDK — Tier 2 Assessment

SDK: modelcontextprotocol/rust-sdk
Version: rmcp v1.0.0 (branch: main) · crates.io/crates/rmcp/1.0.0
Assessed: 2026-03-04
Requested tier: Tier 2
Tool: @modelcontextprotocol/conformance tier-check

Result

All Tier 2 requirements are met.

Requirements Detail

1. Server Conformance — ✅ 26/30 (86.7%)

Tested against spec versions 2025-06-18 and 2025-11-25 using the conformance test suite. 4 scenarios fail — all tracked in ROADMAP.md.

Evidence: How to run it yourself

2. Client Conformance — ✅ 17/20 (85.0%)

Core: 4/4 (100%), Auth: 13/16 (81%) scored. 4 informational scenarios (draft/extension) are not scored for tier per conformance testing rules. All 3 date-versioned failures are tracked in ROADMAP.md.

Evidence: How to run it yourself

3. Issue Triage — ✅ 100% (23/23)

All 23 issues triaged within 2 business days (exceeds Tier 2's 1-month requirement). All 12 required labels are present. Automated triage via triage workflow.

Evidence: Open issues without any triage label

4. P0 Resolution — ✅ 0 open

No open P0 issues.

Evidence: Open P0 issues (should show 0 results)

5. Stable Release — ✅ rmcp v1.0.0

Published on crates.io and GitHub Releases. Companion macro crate also at rmcp-macros v1.0.0. Migration guide published in discussions.

6. Spec Tracking — ✅ < 6-month gap

Accepted SEPS from 2025-11-25 are complete with the sole exception of SEP-1649. It is anticipated that this outstanding item will be resolved within the coming days, comfortably within the six-month compliance window.

7. Documentation — ✅ 26/48 features

All core MCP features (tools, resources, prompts, sampling, roots, logging, completions, transports) are documented with prose and code examples in the README.md. OAuth documented in docs/OAUTH_SUPPORT.md. This meets Tier 2's "basic documentation covering core features" requirement. The remaining 22 features (14 undocumented + 8 partial) are tracked in ROADMAP.md for Tier 1.

8. Dependency Policy — ✅

.github/dependabot.yml — Weekly Cargo dependency updates and daily GitHub Actions updates. Pull request limits and commit message conventions configured.

9. Roadmap — ✅

ROADMAP.md — Tracks the path from Tier 2 to Tier 1 with concrete work items: 4 server conformance fixes, 3 client conformance fixes, VERSIONING.md creation, and 22 documentation gaps (14 FAIL + 8 PARTIAL features). Also tracks informational (non-scored) draft/extension scenario gaps.

Reproduce This Assessment

git clone https://github.com/modelcontextprotocol/conformance.git
cd conformance
npm install
npm run build
npm run --silent tier-check -- --repo modelcontextprotocol/rust-sdk --skip-conformance

# Terminal 1: Clone and start the SDK's conformance server
git clone https://github.com/modelcontextprotocol/rust-sdk.git
cd rust-sdk
cargo build --release -p mcp-conformance
./target/release/conformance-server &
# Server starts on http://127.0.0.1:8001/mcp

# Terminal 2: Run the full tier-check
cd conformance
npm run --silent tier-check -- \
  --repo modelcontextprotocol/rust-sdk \
  --conformance-server-url http://127.0.0.1:8001/mcp \
  --client-cmd './target/release/conformance-client'

# Terminal output (default)
npm run --silent tier-check -- --repo modelcontextprotocol/rust-sdk --skip-conformance

# Markdown report
npm run --silent tier-check -- --repo modelcontextprotocol/rust-sdk --skip-conformance --output markdown

# Machine-readable JSON
npm run --silent tier-check -- --repo modelcontextprotocol/rust-sdk --skip-conformance --output json