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feat: mcp sdk compliance
* adds conformance server and client * adds results from initial run of https://github.com/modelcontextprotocol/conformance/tree/main/.claude/skills/mcp-sdk-tier-audit skill * various small changes applied during the testing loop
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‎Cargo.toml‎

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[workspace]
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members = ["crates/rmcp", "crates/rmcp-macros", "examples/*"]
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members = ["crates/rmcp", "crates/rmcp-macros", "examples/*", "conformance"]
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default-members = ["crates/rmcp", "crates/rmcp-macros"]
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resolver = "2"
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‎conformance/Cargo.toml‎

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[package]
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name = "mcp-conformance"
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version = "0.1.0"
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edition = "2021"
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[[bin]]
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name = "conformance-server"
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path = "src/bin/server.rs"
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[[bin]]
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name = "conformance-client"
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path = "src/bin/client.rs"
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[dependencies]
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rmcp = { path = "../crates/rmcp", features = [
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"server",
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"client",
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"elicitation",
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"auth",
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"transport-streamable-http-server",
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"transport-streamable-http-client-reqwest",
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] }
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tokio = { version = "1", features = ["full"] }
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tokio-util = { version = "0.7" }
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serde = { version = "1", features = ["derive"] }
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serde_json = "1"
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tracing = "0.1"
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tracing-subscriber = { version = "0.3", features = ["env-filter"] }
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axum = { version = "0.8", features = ["macros"] }
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anyhow = "1"
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reqwest = { version = "0.13", features = ["json"] }
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urlencoding = "2"
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url = "2"
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p256 = { version = "0.13", features = ["ecdsa"] }
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base64 = "0.22"

‎conformance/results/2026-02-25-rust-sdk-assessment.md‎

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# MCP SDK Tier Audit: modelcontextprotocol/rust-sdk
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**Date**: 2026-02-25
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**Branch**: alexhancock/conformance
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**Auditor**: mcp-sdk-tier-audit skill (automated + subagent evaluation)
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## Tier Assessment: Tier 3
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The Rust SDK (rmcp) is currently at Tier 3. While server and client conformance pass rates exceed the 80% Tier 2 threshold, several critical Tier 2 requirements are not met: issue triage compliance is very low (14.1%), required labels are largely missing (3/12), no stable release ≥1.0.0 exists, and no roadmap is published.
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### Requirements Summary
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| # | Requirement | Tier 1 Standard | Tier 2 Standard | Current Value | T1? | T2? | Gap |
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|---|-------------|----------------|-----------------|---------------|-----|-----|-----|
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| 1a | Server Conformance | 100% pass rate | >= 80% pass rate | 83.3% (25/30) | FAIL | PASS | 5 failing scenarios (prompts-get-with-args, prompts-get-embedded-resource, elicitation-sep1330-enums, elicitation-sep1034-defaults, dns-rebinding-protection) |
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| 1b | Client Conformance | 100% pass rate | >= 80% pass rate | 85.0% (17/20) | FAIL | PASS | 3 failing date-versioned scenarios (scope-step-up, metadata-var3, 2025-03-26-oauth-endpoint-fallback) |
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| 2 | Issue Triage | >= 90% within 2 biz days | >= 80% within 1 month | 14.1% (9/64) | FAIL | FAIL | 54 issues exceeding SLA; median 4341h |
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| 2b | Labels | 12 required labels | 12 required labels | 3/12 | FAIL | FAIL | Missing: bug, enhancement, needs confirmation, needs repro, ready for work, P0, P1, P2, P3 |
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| 3 | Critical Bug Resolution | All P0s within 7 days | All P0s within 2 weeks | 0 open | PASS | PASS | None |
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| 4 | Stable Release | Required + clear versioning | At least one stable release | rmcp-v0.16.0 | FAIL | FAIL | No release >= 1.0.0 |
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| 4b | Spec Tracking | Timeline agreed per release | Within 6 months | 6d gap (PASS) | PASS | PASS | None |
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| 5 | Documentation | Comprehensive w/ examples | Basic docs for core features | ~8/48 features | FAIL | FAIL | Most features lack prose documentation |
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| 6 | Dependency Policy | Published update policy | Published update policy | dependabot.yml configured | PASS | PASS | None |
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| 7 | Roadmap | Published roadmap | Plan toward Tier 1 | Not found | FAIL | FAIL | No ROADMAP.md or docs/roadmap.md |
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| 8 | Versioning Policy | Documented breaking change policy | N/A | Not found | FAIL | N/A | No VERSIONING.md or BREAKING_CHANGES.md |
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### Tier Determination
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- Tier 1: FAIL — 3/11 requirements met (failing: server_conformance, client_conformance, triage, labels, stable_release, documentation, roadmap, versioning)
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- Tier 2: FAIL — 4/9 requirements met (failing: triage, labels, stable_release, documentation, roadmap)
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- **Final Tier: 3**
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---
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## Server Conformance Details
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Pass rate: 83.3% (25/30)
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| Scenario | Status | Checks | Spec Versions |
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|----------|--------|--------|---------------|
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| server-tools-list | PASS | 1/1 | 2025-06-18, 2025-11-25 |
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| server-tools-call-with-progress | PASS | 1/1 | 2025-06-18, 2025-11-25 |
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| server-tools-call-with-logging | PASS | 1/1 | 2025-06-18, 2025-11-25 |
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| server-tools-call-simple-text | PASS | 1/1 | 2025-06-18, 2025-11-25 |
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| server-tools-call-sampling | PASS | 1/1 | 2025-06-18, 2025-11-25 |
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| server-tools-call-mixed-content | PASS | 1/1 | 2025-06-18, 2025-11-25 |
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| server-tools-call-image | PASS | 1/1 | 2025-06-18, 2025-11-25 |
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| server-tools-call-error | PASS | 1/1 | 2025-06-18, 2025-11-25 |
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| server-tools-call-embedded-resource | PASS | 1/1 | 2025-06-18, 2025-11-25 |
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| server-tools-call-elicitation | PASS | 1/1 | 2025-06-18, 2025-11-25 |
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| server-tools-call-audio | PASS | 1/1 | 2025-06-18, 2025-11-25 |
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| server-server-sse-multiple-streams | PASS | 2/2 | 2025-11-25 |
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| server-server-initialize | PASS | 1/1 | 2025-06-18, 2025-11-25 |
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| server-resources-unsubscribe | PASS | 1/1 | 2025-06-18, 2025-11-25 |
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| server-resources-templates-read | PASS | 1/1 | 2025-06-18, 2025-11-25 |
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| server-resources-subscribe | PASS | 1/1 | 2025-06-18, 2025-11-25 |
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| server-resources-read-text | PASS | 1/1 | 2025-06-18, 2025-11-25 |
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| server-resources-read-binary | PASS | 1/1 | 2025-06-18, 2025-11-25 |
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| server-resources-list | PASS | 1/1 | 2025-06-18, 2025-11-25 |
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| server-prompts-list | PASS | 1/1 | 2025-06-18, 2025-11-25 |
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| server-prompts-get-with-image | PASS | 1/1 | 2025-06-18, 2025-11-25 |
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| server-prompts-get-with-args | FAIL | 0/1 | 2025-06-18, 2025-11-25 |
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| server-prompts-get-simple | PASS | 1/1 | 2025-06-18, 2025-11-25 |
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| server-prompts-get-embedded-resource | FAIL | 0/1 | 2025-06-18, 2025-11-25 |
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| server-ping | PASS | 1/1 | 2025-06-18, 2025-11-25 |
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| server-logging-set-level | PASS | 1/1 | 2025-06-18, 2025-11-25 |
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| server-elicitation-sep1330-enums | FAIL | 4/5 | 2025-11-25 |
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| server-elicitation-sep1034-defaults | FAIL | 2/5 | 2025-11-25 |
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| server-dns-rebinding-protection | FAIL | 1/2 | 2025-11-25 |
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| server-completion-complete | PASS | 1/1 | 2025-06-18, 2025-11-25 |
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---
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## Client Conformance Details
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Full suite pass rate: 85.0% (17/20 date-versioned)
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> **Suite breakdown**: Core: 4/4 (100%), Auth (date-versioned): 13/16 (81.3%)
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### Core Scenarios
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| Scenario | Status | Checks | Spec Versions |
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|----------|--------|--------|---------------|
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| tools_call | PASS | 1/1 | 2025-06-18, 2025-11-25 |
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| sse-retry | PASS | 3/3 | 2025-11-25 |
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| initialize | PASS | 1/1 | 2025-06-18, 2025-11-25 |
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| elicitation-sep1034-client-defaults | PASS | 5/5 | 2025-11-25 |
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### Auth Scenarios (Date-Versioned)
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| Scenario | Status | Checks | Spec Versions | Notes |
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|----------|--------|--------|---------------|-------|
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| auth/token-endpoint-auth-post | PASS | 19/19 | 2025-06-18, 2025-11-25 | |
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| auth/token-endpoint-auth-none | PASS | 19/19 | 2025-06-18, 2025-11-25 | |
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| auth/token-endpoint-auth-basic | PASS | 19/19 | 2025-06-18, 2025-11-25 | |
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| auth/scope-step-up | FAIL | 13/14 | 2025-11-25 | |
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| auth/scope-retry-limit | PASS | 11/11 | 2025-11-25 | |
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| auth/scope-omitted-when-undefined | PASS | 15/15 | 2025-11-25 | |
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| auth/scope-from-www-authenticate | PASS | 11/11 | 2025-11-25 | |
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| auth/scope-from-scopes-supported | PASS | 15/15 | 2025-11-25 | |
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| auth/pre-registration | PASS | 14/14 | 2025-11-25 | |
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| auth/metadata-var3 | FAIL | 0/4 | 2025-11-25 | |
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| auth/metadata-var2 | PASS | 14/14 | 2025-11-25 | |
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| auth/metadata-var1 | PASS | 14/14 | 2025-11-25 | |
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| auth/metadata-default | PASS | 14/14 | 2025-11-25 | |
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| auth/basic-cimd | PASS | 14/14 | 2025-11-25 | |
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| auth/2025-03-26-oauth-metadata-backcompat | PASS | 12/12 | 2025-03-26 | |
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| auth/2025-03-26-oauth-endpoint-fallback | FAIL | 0/3 | 2025-03-26 | |
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### Auth Scenarios (Informational — not scored)
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| Scenario | Status | Checks | Spec Versions |
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|----------|--------|--------|---------------|
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| auth/resource-mismatch | FAIL | 14/15 | draft |
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| auth/cross-app-access-complete-flow | FAIL | 10/12 | extension |
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| auth/client-credentials-jwt | FAIL | 4/5 | extension |
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| auth/client-credentials-basic | PASS | 9/9 | extension |
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---
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## Issue Triage Details
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Analysis period: Last 64 issues
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Labels present: question, good first issue, help wanted (3/12)
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Uses issue types: No
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| Metric | Value | T1 Req | T2 Req | Verdict |
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|--------|-------|--------|--------|---------|
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| Compliance rate | 14.1% | >= 90% | >= 80% | FAIL |
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| Triaged within SLA | 9 | — | — | — |
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| Exceeding SLA | 54 | — | — | — |
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| Median triage time | 4341.3h | — | — | — |
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| P95 triage time | 8095.1h | — | — | — |
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| Open P0s | 0 | 0 | 0 | PASS |
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---
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## Documentation Coverage
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### Documentation Coverage Assessment
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**SDK path**: ~/Development/rust-sdk
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**Documentation locations found**:
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- README.md: Top-level overview, basic client/server setup
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- crates/rmcp/README.md: Core library docs with quick start, transport options, feature flags, structured output, tasks
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- examples/README.md: Quick start with Claude Desktop
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- examples/servers/README.md: Server example descriptions
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- examples/clients/README.md: Client example descriptions
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- docs/OAUTH_SUPPORT.md: OAuth 2.1 authorization documentation
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- crates/rmcp-macros/README.md: Macro crate documentation
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#### Feature Documentation Table
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| # | Feature | Documented? | Where | Has Examples? | Verdict |
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|---|---------|-------------|-------|---------------|---------|
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| 1 | Tools - listing | Yes | crates/rmcp/README.md:21-90 | Yes (1 example) | PASS |
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| 2 | Tools - calling | Yes | crates/rmcp/README.md:21-90, examples/clients/README.md | Yes (2 examples) | PASS |
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| 3 | Tools - text results | Yes | crates/rmcp/README.md:50-60 | Yes (1 example) | PASS |
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| 4 | Tools - image results | No | — | No | FAIL |
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| 5 | Tools - audio results | No | — | No | FAIL |
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| 6 | Tools - embedded resources | No | — | No | FAIL |
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| 7 | Tools - error handling | No | — | No | FAIL |
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| 8 | Tools - change notifications | No | — | No | FAIL |
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| 9 | Resources - listing | No | — | Yes (example in everything_stdio.rs) | PARTIAL |
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| 10 | Resources - reading text | No | — | Yes (example in everything_stdio.rs) | PARTIAL |
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| 11 | Resources - reading binary | No | — | No | FAIL |
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| 12 | Resources - templates | No | — | Yes (example in everything_stdio.rs) | PARTIAL |
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| 13 | Resources - template reading | No | — | No | FAIL |
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| 14 | Resources - subscribing | No | — | No | FAIL |
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| 15 | Resources - unsubscribing | No | — | No | FAIL |
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| 16 | Resources - change notifications | No | — | No | FAIL |
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| 17 | Prompts - listing | No | — | Yes (example in everything_stdio.rs) | PARTIAL |
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| 18 | Prompts - getting simple | No | — | Yes (example in everything_stdio.rs) | PARTIAL |
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| 19 | Prompts - getting with arguments | No | — | Yes (example in everything_stdio.rs) | PARTIAL |
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| 20 | Prompts - embedded resources | No | — | No | FAIL |
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| 21 | Prompts - image content | No | — | No | FAIL |
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| 22 | Prompts - change notifications | No | — | No | FAIL |
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| 23 | Sampling - creating messages | No | — | Yes (servers/sampling_stdio.rs, clients/sampling_stdio.rs) | PARTIAL |
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| 24 | Elicitation - form mode | Yes | examples/servers/README.md:38-53 | Yes (elicitation_stdio.rs) | PASS |
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| 25 | Elicitation - URL mode | No | — | No | FAIL |
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| 26 | Elicitation - schema validation | No | — | No | FAIL |
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| 27 | Elicitation - default values | No | — | No | FAIL |
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| 28 | Elicitation - enum values | No | — | Yes (elicitation_enum_inference.rs) | PARTIAL |
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| 29 | Elicitation - complete notification | No | — | No | FAIL |
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| 30 | Roots - listing | No | — | No | FAIL |
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| 31 | Roots - change notifications | No | — | No | FAIL |
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| 32 | Logging - sending log messages | No | — | No | FAIL |
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| 33 | Logging - setting level | No | — | No | FAIL |
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| 34 | Completions - resource argument | No | — | Yes (completion_stdio.rs) | PARTIAL |
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| 35 | Completions - prompt argument | No | — | Yes (completion_stdio.rs) | PARTIAL |
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| 36 | Ping | No | — | No | FAIL |
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| 37 | Streamable HTTP transport (client) | Yes | crates/rmcp/README.md:175-195 | Yes (clients/streamable_http.rs) | PASS |
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| 38 | Streamable HTTP transport (server) | Yes | crates/rmcp/README.md:175-195 | Yes (servers/counter_streamhttp.rs) | PASS |
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| 39 | SSE transport - legacy (client) | No | — | No | FAIL |
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| 40 | SSE transport - legacy (server) | No | — | No | FAIL |
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| 41 | stdio transport (client) | Yes | crates/rmcp/README.md:140-165 | Yes (clients/git_stdio.rs) | PASS |
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| 42 | stdio transport (server) | Yes | crates/rmcp/README.md:21-90 | Yes (servers/counter_stdio.rs) | PASS |
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| 43 | Progress notifications | No | — | Yes (servers/progress_demo.rs, clients/progress_client.rs) | PARTIAL |
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| 44 | Cancellation | No | — | No | FAIL |
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| 45 | Pagination | No | — | No | FAIL |
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| 46 | Capability negotiation | No | — | No | FAIL |
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| 47 | Protocol version negotiation | No | — | No | FAIL |
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| 48 | JSON Schema 2020-12 support | Yes | README.md:32-33, crates/rmcp/README.md:92-120 | Yes (structured output example) | PASS |
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| — | Tasks - get (experimental) | Yes | crates/rmcp/README.md (Tasks section) | No | INFO |
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| — | Tasks - result (experimental) | Yes | crates/rmcp/README.md (Tasks section) | No | INFO |
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| — | Tasks - cancel (experimental) | Yes | crates/rmcp/README.md (Tasks section) | No | INFO |
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| — | Tasks - list (experimental) | No | — | No | INFO |
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| — | Tasks - status notifications (experimental) | No | — | No | INFO |
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#### Summary
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**Total non-experimental features**: 48
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**PASS (documented with examples)**: 9/48
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**PARTIAL (documented or examples only)**: 11/48
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**FAIL (not documented)**: 28/48
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**Core features documented**: ~6/36 (16.7%)
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**All features documented with examples**: 9/48 (18.8%)
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#### Tier Verdicts
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**Tier 1** (all non-experimental features documented with examples): **FAIL**
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- 39 features missing full documentation with examples
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**Tier 2** (basic docs covering core features): **FAIL**
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- Most core features (resources, prompts, sampling, roots, logging, completions, notifications, subscriptions) lack prose documentation
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- Only tools (basic), transports (stdio, streamable HTTP), elicitation (form mode), and JSON Schema have adequate prose docs
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---
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## Policy Evaluation
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### Policy Evaluation Assessment
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**SDK path**: ~/Development/rust-sdk
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**Repository**: modelcontextprotocol/rust-sdk
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---
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#### 1. Dependency Update Policy: PASS
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| File | Exists (CLI) | Content Verdict |
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|------|-------------|----------------|
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| DEPENDENCY_POLICY.md | No | N/A |
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| docs/dependency-policy.md | No | N/A |
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| .github/dependabot.yml | Yes | Configured — weekly Cargo updates, daily GitHub Actions updates, with PR limits and labeling |
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| .github/renovate.json | No | N/A |
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**Verdict**: **PASS** — Dependabot is properly configured with weekly Cargo dependency updates and daily GitHub Actions updates.
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---
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#### 2. Roadmap: FAIL
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| File | Exists (CLI) | Content Verdict |
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|------|-------------|----------------|
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| ROADMAP.md | No | N/A |
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| docs/roadmap.md | No | N/A |
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**Verdict**:
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- **Tier 1**: **FAIL** — No roadmap file exists.
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- **Tier 2**: **FAIL** — No roadmap or plan-toward-Tier-1 file exists.
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---
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#### 3. Versioning Policy: FAIL
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| File | Exists (CLI) | Content Verdict |
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|------|-------------|----------------|
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| VERSIONING.md | No | N/A |
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| docs/versioning.md | No | N/A |
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| BREAKING_CHANGES.md | No | N/A |
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| CONTRIBUTING.md (versioning section) | No | N/A |
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**Verdict**:
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- **Tier 1**: **FAIL** — No versioning or breaking change documentation exists.
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- **Tier 2**: **N/A** — only requires stable release.
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---
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#### Overall Policy Summary
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| Policy Area | Tier 1 | Tier 2 |
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|-------------|--------|--------|
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| Dependency Update Policy | PASS | PASS |
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| Roadmap | FAIL | FAIL |
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| Versioning Policy | FAIL | N/A |

‎conformance/results/2026-02-25-rust-sdk-remediation.md‎

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# Remediation Guide: modelcontextprotocol/rust-sdk
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**Date**: 2026-02-25
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**Current Tier**: 3
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## Path to Tier 2
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The following requirements must be met to advance from Tier 3 to Tier 2:
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| # | Action | Requirement | Effort | Where |
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|---|--------|-------------|--------|-------|
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| 1 | Create 9 missing issue labels (bug, enhancement, needs confirmation, needs repro, ready for work, P0, P1, P2, P3) and triage existing issues | Labels (3/12 → 12/12) + Triage (14.1% → ≥80%) | Medium | GitHub repo settings, open issues |
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| 2 | Publish stable release ≥ 1.0.0 | Stable Release | Medium | Cargo.toml, release process |
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| 3 | Add prose documentation for core features: resources, prompts, sampling, roots, logging, completions, notifications, subscriptions | Documentation (basic docs for core features) | Large | README.md, docs/, crates/rmcp/README.md |
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| 4 | Create ROADMAP.md with plan toward Tier 1 | Roadmap | Small | ROADMAP.md |
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## Path to Tier 1
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The following requirements must be met to advance to Tier 1 (includes all Tier 2 gaps):
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| # | Action | Requirement | Effort | Where |
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|---|--------|-------------|--------|-------|
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| 1 | Fix 5 failing server conformance scenarios: prompts-get-with-args, prompts-get-embedded-resource, elicitation-sep1330-enums, elicitation-sep1034-defaults, dns-rebinding-protection | Server Conformance (83.3% → 100%) | Medium | Conformance server implementation |
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| 2 | Fix 3 failing client conformance scenarios: auth/scope-step-up, auth/metadata-var3, auth/2025-03-26-oauth-endpoint-fallback | Client Conformance (85.0% → 100%) | Medium | OAuth client implementation |
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| 3 | Create 9 missing issue labels and triage all open issues within 2 business days going forward | Labels + Triage (14.1% → ≥90%) | Medium | GitHub repo settings, issue triage process |
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| 4 | Publish stable release ≥ 1.0.0 with clear versioning | Stable Release | Medium | Cargo.toml, release process |
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| 5 | Document ALL 48 non-experimental features with prose and code examples | Documentation (9/48 → 48/48) | Large | README.md, docs/, crates/rmcp/README.md, examples/ |
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| 6 | Create ROADMAP.md with concrete steps tracking MCP spec components | Roadmap | Small | ROADMAP.md |
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| 7 | Create VERSIONING.md documenting breaking change policy and versioning scheme | Versioning Policy | Small | VERSIONING.md |
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## Recommended Next Steps
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1. **Set up issue labels and begin triage process** (Small effort, unblocks Tier 2 triage requirement). Create the 9 missing labels (bug, enhancement, needs confirmation, needs repro, ready for work, P0-P3) and begin labeling all new issues within 2 business days. Retroactively triage the 54 unlabeled issues.
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2. **Create ROADMAP.md and VERSIONING.md** (Small effort, unblocks Tier 2 roadmap and Tier 1 versioning). Write a roadmap outlining the path to 1.0.0 and Tier 1, and document the versioning/breaking-change policy.
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3. **Write prose documentation for core features** (Large effort, unblocks Tier 2 documentation). Priority features to document: resources (listing, reading, templates, subscriptions), prompts (listing, getting, arguments, embedded resources), sampling, roots, logging, completions, notifications, and change notifications. The SDK already has good examples in `examples/` — these need accompanying prose in `docs/` or `crates/rmcp/README.md`.
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4. **Fix server conformance failures** (Medium effort, advances toward Tier 1). The 5 failures are in prompts-get-with-args, prompts-get-embedded-resource, elicitation-sep1330-enums, elicitation-sep1034-defaults, and dns-rebinding-protection. The elicitation failures appear to be in default value handling and enum validation; the prompts failures may be response format issues.
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5. **Fix client auth conformance failures** (Medium effort, advances toward Tier 1). The 3 date-versioned failures are auth/scope-step-up (1 check failing), auth/metadata-var3 (all 4 checks failing — likely a metadata discovery edge case), and auth/2025-03-26-oauth-endpoint-fallback (all 3 checks failing — legacy endpoint fallback).
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6. **Plan and execute 1.0.0 release** (Medium effort, unblocks Tier 2 stable release). The current version is 0.16.0. A 1.0.0 release signals production readiness and is required for both Tier 1 and Tier 2.

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