modelcontextprotocol

modelcontextprotocol/modelcontextprotocol

Specification and documentation for the Model Context Protocol

Stars: 9.3k
Forks: 1.8k
Open beginner issues: 0
Indexed issues: 74
Avg merge: 1d 12h
Merged PRs (30d): 25

Dominant language: TypeScript
License: No license data
Last GitHub push: Sep 18, 2026
Latest indexed: Sep 20, 2026
Contributing guide: Contributing guide
Code of conduct: Code of conduct
Beginner labels: No beginner labels indexed

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74 open issues indexed

doc typo, "Serves" should be "Servers" in draft resources spec Open

bug

Difficulty 1/5 Under an hour Newbie friendliness 98/100

modelcontextprotocol/modelcontextprotocol#3373 · 1 comment · Opened Sep 19, 2026
Origin validation rejects browser-based MCP clients on authenticated remote servers Open

bug

Difficulty 5/5 Over a week Newbie friendliness 30/100

modelcontextprotocol/modelcontextprotocol#3370 · 1 comment · Opened Sep 18, 2026
Two JSON example code blocks in the docs do not parse (2025-06-18 tools page, SEP-1330) Open

Difficulty 2/5 1-3 hours Newbie friendliness 35/100

modelcontextprotocol/modelcontextprotocol#3369 · Opened Sep 18, 2026
Security considerations section can be improved Open

bug

Difficulty 2/5 1-3 hours Newbie friendliness 68/100

modelcontextprotocol/modelcontextprotocol#3361 · Opened Sep 14, 2026
docs: Fix double border in the footer Open

bug

Difficulty 2/5 1-3 hours Newbie friendliness 84/100

modelcontextprotocol/modelcontextprotocol#3357 · Opened Sep 12, 2026
SEP Extension proposal: verifiable tool results(Verifiable MCP) — ZK proofs / TEE attestations attached to `tools/call` results (working reference implementation, pre-SEP feedback) Open

tracking

Difficulty 5/5 Over a week Newbie friendliness 25/100

modelcontextprotocol/modelcontextprotocol#3354 · 6 comments · Opened Sep 10, 2026
SEP submission: Tool Outcome Attestation extension (dev.agentstatus/toa) Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

modelcontextprotocol/modelcontextprotocol#3350 · 14 comments · Opened Sep 6, 2026
`cancellation.mdx` and `subscriptions.mdx` disagree on how a server ends a `subscriptions/listen` stream Open

Difficulty 3/5 1-2 days Newbie friendliness 84/100

modelcontextprotocol/modelcontextprotocol#3348 · Opened Sep 6, 2026
Custom OAuth MCP connector: intermittent 'Couldn't connect'/'Couldn't reach' errors despite server-side OAuth + protocol succeeding every time Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 35/100

modelcontextprotocol/modelcontextprotocol#3347 · 3 comments · Opened Sep 4, 2026
Expired Discord invite on the Financial Services IG charter page Open

Difficulty 1/5 Under an hour Newbie friendliness 35/100

modelcontextprotocol/modelcontextprotocol#3346 · Opened Sep 4, 2026
Authorization flow documentation still talks about DCR (deprecated) and does not mention CIMD Open

bug

Difficulty 2/5 1-3 hours Newbie friendliness 78/100

modelcontextprotocol/modelcontextprotocol#3345 · 2 comments · Opened Sep 3, 2026
[Community Transport] Full-Duplex WebSocket Transport Implementation for Python & TypeScript Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

modelcontextprotocol/modelcontextprotocol#3339 · Opened Sep 2, 2026
[IG #2626 / Channel-Policy Per-Send Audit] Proposal for the Enterprise IG Audit/Compliance Scope Open

Difficulty 5/5 Over a week Newbie friendliness 28/100

modelcontextprotocol/modelcontextprotocol#3337 · 1 comment · Opened Sep 1, 2026
Ruby SDK — Tier 1 Assessment Open

Difficulty 5/5 Over a week Newbie friendliness 30/100

modelcontextprotocol/modelcontextprotocol#3247 · 4 comments · Opened Aug 15, 2026
`inputSchema` and `requestedSchema` hard-code JSON Schema keywords into dialect-agnostic slots Open

bug

Difficulty 5/5 Over a week Newbie friendliness 42/100

modelcontextprotocol/modelcontextprotocol#3238 · 2 reactions · Opened Aug 14, 2026
Tasks extension (SEP-2663): no interoperable surface for partial output of a running task Open

Difficulty 5/5 Over a week Newbie friendliness 30/100

modelcontextprotocol/modelcontextprotocol#3237 · Opened Aug 14, 2026
[Proposal] Add visibility / 'hidden': true attribute for confidential prompts and server instructions Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

modelcontextprotocol/modelcontextprotocol#3232 · 1 comment · Opened Aug 12, 2026
Clarify whether notifications/resources/list_changed should be sent if the list of resource templates changes Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 55/100

modelcontextprotocol/modelcontextprotocol#3226 · Opened Aug 11, 2026
A list of Implementation Requirements for OAuth Client ID Metadata Document Open

bug

Difficulty 2/5 1-3 hours Newbie friendliness 70/100

modelcontextprotocol/modelcontextprotocol#3224 · Opened Aug 10, 2026
redirect URIs using localhost Open

bug

Difficulty 2/5 1-3 hours Newbie friendliness 68/100

modelcontextprotocol/modelcontextprotocol#3223 · Opened Aug 10, 2026
MCP-2026-015: server/discover instructions field enables prompt injection (amplified by cacheScope:public) Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

modelcontextprotocol/modelcontextprotocol#3213 · 8 comments · Opened Aug 7, 2026
MCP-2026-008: CacheableResult cacheScope:public enables cross-user cache poisoning Open

Difficulty 5/5 Over a week Newbie friendliness 38/100

modelcontextprotocol/modelcontextprotocol#3207 · 1 comment · Opened Aug 6, 2026
generate:schema:json produces empty schemas when using wildcard type on Windows Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 72/100

modelcontextprotocol/modelcontextprotocol#3114 · Opened Jul 22, 2026
[Spec Gap] Tool Execution Errors lack a schema-governed signal for LLM forwarding — structuredContent should be defined for error path Open

bug

Difficulty 5/5 Over a week Newbie friendliness 42/100

modelcontextprotocol/modelcontextprotocol#3003 · 10 comments · Opened Jul 2, 2026
SEP-2549: clarify whether cacheScope is required or defaults to public Open

bug

modelcontextprotocol/modelcontextprotocol#2939 · 2 assignees · Opened Jun 18, 2026
MCP protocol lacks a mechanism for tools to stream incremental results Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

modelcontextprotocol/modelcontextprotocol#2932 · 9 comments · Opened Jun 16, 2026
MRTR url-mode: standardize the "still waiting" response (state-only InputRequiredResult) + retry/cancel guidance Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

modelcontextprotocol/modelcontextprotocol#2920 · Opened Jun 15, 2026
MRTR: `inputRequests` is a closed enum of three methods — add an extensible / reverse-DNS-namespaced member type Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

modelcontextprotocol/modelcontextprotocol#2919 · Opened Jun 15, 2026
SDK feedback: `oneOf` in tool inputSchema isn't practically consumable by tool-calling LLMs Open

modelcontextprotocol/modelcontextprotocol#2806 · 1 comment · 1 assignee · Opened May 27, 2026
SEP-2352 Clarification Open

documentation sdk/2026-07-feedback

Difficulty 4/5 3-5 days Newbie friendliness 35/100

modelcontextprotocol/modelcontextprotocol#2748 · 2 comments · 2 reactions · Opened May 19, 2026
No visibility of errors from tool call responses Open

bug

Difficulty 5/5 Over a week Newbie friendliness 30/100

modelcontextprotocol/modelcontextprotocol#2734 · 8 comments · Opened May 16, 2026
Clarify behavior when `initialize.params.protocolVersion` conflicts with `MCP-Protocol-Version` Open

bug

Difficulty 5/5 Over a week Newbie friendliness 35/100

modelcontextprotocol/modelcontextprotocol#2721 · Opened May 13, 2026
Schema generation pipeline may produce overly permissive schemas without safeguards Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 45/100

modelcontextprotocol/modelcontextprotocol#2600 · 1 comment · Opened Apr 18, 2026
SDK Tiering - 'Task' issues should be out of scope for triage SLAs Open

Difficulty 2/5 1-3 hours Newbie friendliness 68/100

modelcontextprotocol/modelcontextprotocol#2518 · Opened Apr 4, 2026
Proposal: Capability-Aware Tool Presentation for Heterogeneous Model Sizes Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

modelcontextprotocol/modelcontextprotocol#2470 · 4 comments · 1 reaction · Opened Mar 26, 2026
Tasks SEP-1686: In-progress results Open

bug

Difficulty 5/5 Over a week Newbie friendliness 35/100

modelcontextprotocol/modelcontextprotocol#2452 · 1 comment · 2 reactions · Opened Mar 24, 2026
Provide guidance on how to set/use server description/instructions Open

documentation enhancement

modelcontextprotocol/modelcontextprotocol#2146 · 2 comments · 1 assignee · Opened Jan 24, 2026
Unnecessary `Request` and `Notification` objects Open

bug

Difficulty 2/5 1-3 hours Newbie friendliness 70/100

modelcontextprotocol/modelcontextprotocol#2126 · 2 comments · Opened Jan 21, 2026
Add server instructions documentation to main docs Open

documentation enhancement

Difficulty 2/5 1-3 hours Newbie friendliness 64/100

modelcontextprotocol/modelcontextprotocol#2060 · 1 comment · Opened Jan 7, 2026
Register docs MCP server in the official MCP Registry Open

documentation

modelcontextprotocol/modelcontextprotocol#2046 · 1 assignee · Opened Jan 4, 2026
Support blog post content and sdk code examples in MCP docs server Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 35/100

modelcontextprotocol/modelcontextprotocol#2033 · Opened Dec 30, 2025
Update wording for tools, resources, prompts.. Open

documentation

Difficulty 4/5 3-5 days Newbie friendliness 42/100

modelcontextprotocol/modelcontextprotocol#2023 · 1 reaction · Opened Dec 27, 2025
Clarify extensibility intent by adding `additionalProperties: false` to closed types Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 35/100

modelcontextprotocol/modelcontextprotocol#1898 · 10 comments · 2 reactions · Opened Nov 25, 2025
SEP-1814: Caniuse-style Compatibility Matrix for MCP Clients (canimcp) Open

proposal SEP

Difficulty 5/5 Over a week Newbie friendliness 28/100

modelcontextprotocol/modelcontextprotocol#1814 · 8 comments · 4 reactions · Opened Nov 14, 2025
Add Gemini representative to client maintainers group Open

documentation

modelcontextprotocol/modelcontextprotocol#1666 · 1 comment · 1 assignee · Opened Oct 16, 2025
Request: make `resource` parameter OPTIONAL (RFC 8707-aligned) Open

auth security

Difficulty 5/5 Over a week Newbie friendliness 35/100

modelcontextprotocol/modelcontextprotocol#1614 · 21 comments · 8 reactions · Opened Oct 6, 2025
SEP-1488: securitySchemes in Tool Metadata for Mixed-Auth Servers Open

auth draft security SEP

modelcontextprotocol/modelcontextprotocol#1488 · 41 comments · 16 reactions · 1 assignee · Opened Sep 18, 2025
[follow-up] Improve client implementor representation in MCP Steering Committee Open

governance

Difficulty 5/5 Over a week Newbie friendliness 20/100

modelcontextprotocol/modelcontextprotocol#1436 · 3 comments · 3 reactions · Opened Sep 8, 2025
Bug(Schema): Linting issues found using the @sourcemeta/jsonschema cli Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 45/100

modelcontextprotocol/modelcontextprotocol#1416 · Opened Sep 2, 2025
Clarify client handling of structuredContent vs content fields Open

bug

modelcontextprotocol/modelcontextprotocol#1411 · 2 comments · 1 reaction · 1 assignee · Opened Sep 1, 2025

A short digest of beginner-friendly GitHub issues.