Owner

modelcontextprotocol

27 indexed repositories · View on GitHub

servers
Model Context Protocol Servers

TypeScript · 90478 stars
python-sdk
The official Python SDK for Model Context Protocol servers and clients

Python · 24348 stars
typescript-sdk
The official TypeScript SDK for Model Context Protocol servers and clients

TypeScript · 13432 stars
inspector
Visual testing tool for MCP servers

TypeScript · 10913 stars
modelcontextprotocol
Specification and documentation for the Model Context Protocol

TypeScript · 9256 stars
registry
A community driven registry service for Model Context Protocol (MCP) servers.

Go · 7267 stars
go-sdk
The official Go SDK for Model Context Protocol servers and clients. Maintained in collaboration with Google.

Go · 5123 stars
csharp-sdk
The official C# SDK for Model Context Protocol servers and clients. Maintained in collaboration with Microsoft.

C# · 4536 stars
rust-sdk
The official Rust SDK for the Model Context Protocol

Rust · 3944 stars
java-sdk
The official Java SDK for Model Context Protocol servers and clients. Maintained in collaboration with Spring AI

Java · 3702 stars
ext-apps
Official repo for spec & SDK of MCP Apps protocol - standard for UIs embedded AI chatbots, served by MCP servers

TypeScript · 2859 stars
php-sdk
The official PHP SDK for Model Context Protocol servers and clients. Maintained in collaboration with The PHP Foundation.

PHP · 1613 stars
kotlin-sdk
The official Kotlin SDK for Model Context Protocol servers and clients. Maintained in collaboration with JetBrains

Kotlin · 1461 stars
quickstart-resources
A repository of servers and clients from the Model Context Protocol tutorials

TypeScript · 1189 stars
ruby-sdk
The official Ruby SDK for the Model Context Protocol servers and clients.

Ruby · 914 stars
ext-skills
MCP Extension for Skills discovery and distribution through MCP primitives. Maintained by the Skills Over MCP Working Group.

MDX · 655 stars
conformance
Conformance Tests for MCP

TypeScript · 127 stars
example-remote-server
A hosted version of the Everything server - for demonstration and testing purposes, hosted at https://example-server.modelcontextprotocol...

TypeScript · 80 stars
financial-services-interest-group
Financial Services Interest Group

61 stars
ext-tasks
This repository provides a reference for the tasks extensions to the MCP protocol, allowing for long-running operations, such as Agent co...

TypeScript · 46 stars
7 more repositories live on View on GitHub

Beginner friendly Everything

Open All

CLI/TUI error output may not apply the same URL-redaction as the web client's OAuth timeout path Open

bug v2

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

modelcontextprotocol/inspector#2423 · 1 comment · Opened Sep 18, 2026
Form-encoded secret masking can be defeated by an unescaped & inside the secret value itself Open

bug v2

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

modelcontextprotocol/inspector#2422 · 2 comments · Opened Sep 18, 2026
TUI has no clipboard/copy affordance at all — no OSC 52 fallback for terminal copy Open

enhancement v2

Difficulty 4/5 3-5 days Newbie friendliness 48/100

modelcontextprotocol/inspector#2421 · 1 comment · Opened Sep 18, 2026
Skills catalog budget setting has no CLI or TUI equivalent of the Web per-server setting Open

enhancement v2

Difficulty 4/5 3-5 days Newbie friendliness 52/100

modelcontextprotocol/inspector#2420 · 1 comment · Opened Sep 18, 2026
Skills catalog byte/count budget is enforced per-server, not per-session across multiple connected servers Open

enhancement v2

Difficulty 4/5 3-5 days Newbie friendliness 48/100

modelcontextprotocol/inspector#2419 · 1 comment · Opened Sep 18, 2026
REQUEST_DEADLINES WeakMap in requestTimeout.ts has no test/assertion enforcing its one-entry-per-call invariant Open

chore v2

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

modelcontextprotocol/inspector#2418 · 1 comment · Opened Sep 18, 2026
Dockerfile ENV defaults and docs/environment-variables.md can drift independently Open

documentation v2

Difficulty 3/5 1-2 days Newbie friendliness 74/100

modelcontextprotocol/inspector#2417 · 1 comment · Opened Sep 18, 2026
No visible test for Windows path separators in launcher/CLI argument forwarding Open

chore v2

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

modelcontextprotocol/inspector#2416 · 1 comment · Opened Sep 18, 2026
Docker HEALTHCHECK assumes --web unconditionally Open

bug v2

Difficulty 3/5 1-2 days Newbie friendliness 65/100

modelcontextprotocol/inspector#2415 · 1 comment · Opened Sep 18, 2026
TUI has five exhaustive-deps-suppressed effects with no justification comment Open

chore v2

Difficulty 2/5 1-3 hours Newbie friendliness 76/100

modelcontextprotocol/inspector#2414 · 1 comment · Opened Sep 18, 2026
Same JSON-body pretty-print logic is duplicated verbatim in four places Open

chore v2

Difficulty 3/5 1-2 days Newbie friendliness 75/100

modelcontextprotocol/inspector#2413 · 1 comment · Opened Sep 18, 2026
CLI's long-lived stream path can crash with an uncaught EPIPE Open

bug v2

Difficulty 2/5 1-3 hours Newbie friendliness 76/100

modelcontextprotocol/inspector#2412 · 1 comment · Opened Sep 18, 2026
exemptMcpEndpoint's URL/origin comparison has no property-based or fuzz test Open

chore v2

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

modelcontextprotocol/inspector#2411 · 1 comment · Opened Sep 18, 2026
CLI's open() call has no timeout, no catch, and no fallback message Open

bug v2

Difficulty 2/5 1-3 hours Newbie friendliness 74/100

modelcontextprotocol/inspector#2410 · 1 comment · Opened Sep 18, 2026
TUI real-terminal smoke test self-skips in CI — regressions ship with zero CI signal Open

chore v2

Difficulty 4/5 3-5 days Newbie friendliness 58/100

modelcontextprotocol/inspector#2408 · 1 comment · Opened Sep 18, 2026
TUI request/response body rendering has no size cap — risk of terminal hang on large payloads Open

bug v2

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

modelcontextprotocol/inspector#2407 · 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
v2 ships with no LICENSE file, and four manifests declare plain MIT Open

chore v2

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

modelcontextprotocol/inspector#2406 · 1 comment · Opened Sep 18, 2026
A resource template with a non-ASCII or space literal is advertised but can never be read Open

v1 v2

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

modelcontextprotocol/python-sdk#3526 · 1 comment · Opened Sep 18, 2026
Publish 403s for org namespace despite Owner role + public membership (io.github.<org>/*) Open

Difficulty 4/5 3-5 days Newbie friendliness 52/100

modelcontextprotocol/registry#1649 · 1 reaction · Opened Sep 17, 2026
[v2] Server-side hook for subscriptions/listen resource subscriptions (attach/detach per URI) Open

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

modelcontextprotocol/typescript-sdk#2827 · 1 comment · Opened Sep 17, 2026
--verify reports outcome "verified" and exits 0 for a skill whose resources are "dynamic", with nothing hashed Open

bug v2

Difficulty 4/5 3-5 days Newbie friendliness 48/100

modelcontextprotocol/inspector#2405 · 1 comment · Opened Sep 17, 2026
Modern skills/get results must carry ttlMs and cacheScope (ext-skills stable spec) Open

bug v2

Difficulty 2/5 1-3 hours Newbie friendliness 85/100

modelcontextprotocol/inspector#2404 · 1 comment · Opened Sep 17, 2026
CLI and TUI advertise io.modelcontextprotocol/ui although they cannot render MCP Apps Open

bug v2

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

modelcontextprotocol/inspector#2403 · 1 comment · Opened Sep 17, 2026
Streamable HTTP client stays closed after an interrupted response and raises ExceptionGroup on cleanup Open

v1 v2

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

modelcontextprotocol/python-sdk#3522 · 1 comment · Opened Sep 17, 2026
[Proposal] Declarative tool registration & runtime filtering for version gating (#1557) Open

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

modelcontextprotocol/csharp-sdk#1881 · Opened Sep 17, 2026
docs: re-align the H2 2026 roadmap with the published MCP roadmap (2026-08-22) and official extensions Open

documentation v2

modelcontextprotocol/inspector#2400 · 1 comment · 1 assignee · Opened Sep 16, 2026
A tool with a *args or **kwargs parameter is registered with a schema it can never satisfy Open

v1 v2

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

modelcontextprotocol/python-sdk#3514 · 1 comment · Opened Sep 16, 2026
ClientSession.call_tool issues a tools/list after every tools/call when the output-schema cache is empty — no opt-out; doubles round-trips on per-call sessions Open

v1 v2

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

modelcontextprotocol/python-sdk#3513 · 1 comment · Opened Sep 16, 2026
Millet cleaning Open

bug

Difficulty 5/5 Over a week Newbie friendliness 10/100

modelcontextprotocol/registry#1645 · Opened Sep 16, 2026
sequentialthinking: a branchId that collides with an Object.prototype key throws instead of creating the branch, and the failed call still extends thoughtHistory Open

Difficulty 3/5 1-2 days Newbie friendliness 82/100

modelcontextprotocol/servers#4813 · 1 comment · Opened Sep 16, 2026
Support Scala version of quicikstart-resources. Open

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

modelcontextprotocol/quickstart-resources#199 · Opened Sep 16, 2026
MCP Client: Add bounded connection-establishment recovery with end-to-end timeout and closure guarantees Open

enhancement

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

modelcontextprotocol/csharp-sdk#1879 · Opened Sep 16, 2026
Clarify the value of Skills over MCP vs. locally installed Skills, and the Tool–Skill association model Open

enhancement

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

modelcontextprotocol/ext-skills#145 · Opened Sep 16, 2026
request-state-complete accepts tool-error results and completions missing its documented state-ok marker Open

Difficulty 3/5 1-2 days Newbie friendliness 76/100

modelcontextprotocol/conformance#505 · 1 comment · Opened Sep 15, 2026
Revocation requires client_secret to be present Open

v1 v2

Difficulty 1/5 Under an hour Newbie friendliness 91/100

modelcontextprotocol/python-sdk#3508 · 2 comments · Opened Sep 15, 2026
Add ContHunt remote MCP server Open

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

modelcontextprotocol/servers#4812 · Opened Sep 15, 2026
mcp: the negotiated protocol version is recorded on one path of four, so stdio accepts batches a SEP-2575 session forbids Open

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

modelcontextprotocol/go-sdk#1272 · Opened Sep 15, 2026
759 declared endpoints fail the `initialize` handshake, and 70 more are broken before it Open

Difficulty 3/5 1-2 days Newbie friendliness 48/100

modelcontextprotocol/registry#1643 · Opened Sep 15, 2026
OAuth client: authorization URL is built with a second `?` when the advertised `authorization_endpoint` already carries a query (RFC 6749 §3.1) Open

v1 v2

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

modelcontextprotocol/python-sdk#3505 · 2 comments · Opened Sep 15, 2026
everything: session resources evict another session's resource when two sessions use the same file name Open

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

modelcontextprotocol/servers#4808 · 1 comment · Opened Sep 15, 2026
Does same-origin redirect enforcement break MCP servers behind a reverse proxy? Open

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

modelcontextprotocol/python-sdk#3504 · Opened Sep 15, 2026
Experimental finding: Stars MCP server passes official SEP-2640 server conformance scenarios with single-source skill delivery Open

Difficulty 2/5 1-3 hours Newbie friendliness 52/100

modelcontextprotocol/ext-skills#144 · Opened Sep 14, 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
streamable-http server: duplicate SEP-2243 headers silently resolve to the first value Open

bug P0 ready for work T-security T-transport

modelcontextprotocol/rust-sdk#1272 · 1 assignee · Opened Sep 14, 2026
streamable-http server: a supplied Mcp-Method contradicting an initialize body is silently accepted Open

bug P1 ready for work T-transport

Difficulty 2/5 1-3 hours Newbie friendliness 76/100

modelcontextprotocol/rust-sdk#1271 · Opened Sep 14, 2026
Chat composer is displaced upward after interacting with a fullscreen MCP App and sending a message Open

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

modelcontextprotocol/ext-apps#776 · Opened Sep 14, 2026
streamable HTTP client: the standalone GET stream advertises Accept: application/json but can only read text/event-stream, then gives up silently Open

v1 v2

Difficulty 3/5 1-2 days Newbie friendliness 73/100

modelcontextprotocol/python-sdk#3503 · 1 comment · Opened Sep 14, 2026
[Server] Decode JSON-RPC objects as stdClass, not associative arrays Open

enhancement

Difficulty 4/5 3-5 days Newbie friendliness 55/100

modelcontextprotocol/php-sdk#510 · 1 comment · Opened Sep 14, 2026
git_checkout reports "Switched to branch 'X'" when the checkout actually detached HEAD Open

Difficulty 2/5 1-3 hours Newbie friendliness 86/100

modelcontextprotocol/servers#4804 · 1 comment · Opened Sep 14, 2026

Showing the newest 100

This page lists what was indexed most recently. Advanced filter has the whole inventory, narrowed by language, difficulty and how long a task takes.

Open advanced filter

modelcontextprotocol

Showing the newest 100

Get new issues in your inbox