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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

test_safe_join_rejects_symlink_escape fails on Windows without elevation or Developer Mode Open

v2

Difficulty 1/5 Under an hour Newbie friendliness 88/100

modelcontextprotocol/python-sdk#3408 · 3 comments · Opened Aug 28, 2026
Session-lifecycle bookkeeping logs at info, spamming multiple log lines per request on stateless streamable HTTP Open

P3

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

modelcontextprotocol/go-sdk#1204 · Opened Aug 28, 2026
HTTP+SSE client: POST responses are never disposed, leaking one connection per sent message Open

Difficulty 1/5 Under an hour Newbie friendliness 88/100

modelcontextprotocol/csharp-sdk#1840 · 1 comment · Opened Aug 27, 2026
UriTemplate.match() does not percent-decode extracted values Open

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

modelcontextprotocol/typescript-sdk#2728 · 4 comments · Opened Aug 27, 2026
outputSchema always emitted as JSON Schema draft-07, breaking clients that only accept 2020-12 Open

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

modelcontextprotocol/typescript-sdk#2721 · 4 comments · 2 reactions · Opened Aug 26, 2026
Docs: registerClient's @deprecated notice cites SEP-2577; DCR deprecation is PR #2858 (SEP-2577 is Roots/Sampling/Logging) Open

Difficulty 1/5 Under an hour Newbie friendliness 85/100

modelcontextprotocol/typescript-sdk#2719 · Opened Aug 26, 2026
stdio client never closes the server's stdin, so every client dispose burns the full ShutdownTimeout (5s by default) Open

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

modelcontextprotocol/csharp-sdk#1836 · Opened Aug 25, 2026
OAuthClientProvider auth lock is permanently poisoned when httpx closes async_auth_flow from a different task (RuntimeError: The current task is not holding this lock) Open

v1 v2

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

modelcontextprotocol/python-sdk#3382 · 4 comments · Opened Aug 25, 2026
Rename repo to `ext-server-card` Open

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

modelcontextprotocol/ext-server-card#51 · 1 reaction · Opened Aug 24, 2026
Consider renaming `supportedProtocolVersions` to `supportedVersions` Open

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

modelcontextprotocol/ext-server-card#49 · Opened Aug 24, 2026
pyjwt[crypto] as an unconditional dependency blocks installation on platforms without a cryptography wheel (e.g. Windows on ARM) Open

v1 v2

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

modelcontextprotocol/python-sdk#3373 · 6 comments · Opened Aug 24, 2026
Deno: TS2307 on all .js subpath imports — './*' exports map types to '*.js.d.ts' Open

v1

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

modelcontextprotocol/typescript-sdk#2701 · 2 comments · Opened Aug 22, 2026
Client treats JSON-null structuredContent as missing, skipping outputSchema validation Open

spec-2026-07-28 v2

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

modelcontextprotocol/python-sdk#3345 · 2 comments · Opened Aug 20, 2026
[Server] Handler type uses bare Closure, hard to decorate RegistryInterface under strict PHPStan Open

Server

Difficulty 1/5 Under an hour Newbie friendliness 78/100

modelcontextprotocol/php-sdk#468 · 2 comments · Opened Aug 20, 2026
Prompt validation errors are logged with an unnecessary traceback Open

v1 v2

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

modelcontextprotocol/python-sdk#3342 · 2 comments · Opened Aug 20, 2026
docs: no guidance for supporting SDK 1.x and 2.x at the same time Open

v2

Difficulty 2/5 Half a day Newbie friendliness 62/100

modelcontextprotocol/python-sdk#3309 · 10 comments · Opened Aug 14, 2026
Streamable HTTP clean EOF reconnects can exceed the request retry budget Open

bug needs confirmation P2 v1 v2

Difficulty 2/5 1-3 hours Newbie friendliness 88/100

modelcontextprotocol/python-sdk#3307 · 5 comments · Opened Aug 14, 2026
Streamable HTTP SSE tests assume multiple events share one fetch chunk Open

bug good first issue P3 v1 v2

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

modelcontextprotocol/typescript-sdk#2661 · 2 comments · Opened Aug 14, 2026
"Quick Start" does not work on Windows/PowerShell, but that is not documented Open

bug

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

modelcontextprotocol/example-remote-server#52 · Opened Aug 13, 2026
find_context_parameter treats a Context return annotation as a parameter Open

P3 v1 v2

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

modelcontextprotocol/python-sdk#3298 · 5 comments · Opened Aug 12, 2026
resource_url_from_server_url preserves explicit default ports Open

P3 v1 v2

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

modelcontextprotocol/python-sdk#3297 · 1 comment · Opened Aug 12, 2026
[v2] subscriptions/listen holds a stream open even when it has honoured nothing Open

bug P1 ready for work spec-2026-07-28 v2

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

modelcontextprotocol/typescript-sdk#2650 · 2 comments · Opened Aug 12, 2026
Documentation for MCP Apps does not match 2026-07-28 specification Open

bug

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

modelcontextprotocol/ext-apps#742 · 1 comment · Opened Aug 12, 2026
ServerCapabilities.logging is added unconditionally, overriding the caller's explicit capabilities Open

bug P2 ready for work

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

modelcontextprotocol/java-sdk#1086 · 1 comment · Opened Aug 11, 2026
[v2] Legacy-era cancel of a resumed request: notifications/cancelled inherits the request's resumptionToken, so the transport swallows the cancellation and opens a rogue resumed GET Open

v1 v2

Difficulty 2/5 1-3 hours Newbie friendliness 88/100

modelcontextprotocol/typescript-sdk#2646 · 1 comment · 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
Docs: passing z.object() as inputSchema on v1 fails silently (empty schema) or cryptically (tools/list crash) — not covered in troubleshooting or migration guide Open

documentation enhancement good first issue P3 v1 v2

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

modelcontextprotocol/typescript-sdk#2627 · 4 comments · Opened Aug 9, 2026
public API naming and shape decisions drift without a referenced style guide Open

P3 question T-documentation T-enhancement

Difficulty 1/5 Under an hour Newbie friendliness 86/100

modelcontextprotocol/rust-sdk#1155 · Opened Aug 8, 2026
Link to community directories in the README Open

Difficulty 1/5 Under an hour Newbie friendliness 62/100

modelcontextprotocol/servers#4616 · 2 comments · Opened Aug 5, 2026
Client.listTools() corrupts its cached tool metadata when an output schema fails to compile Open

bug P3 ready for work v1

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

modelcontextprotocol/typescript-sdk#2614 · 1 comment · Opened Aug 4, 2026
Client.callTool() throws -32602 after tools/list_changed replaces an in-flight call's output schema Open

bug P2 ready for work v1

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

modelcontextprotocol/typescript-sdk#2612 · 1 comment · Opened Aug 4, 2026
Expose create_mcp_http_client and McpHttpClientFactory as public API (2.0 made them private-only) Open

P1 v2

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

modelcontextprotocol/python-sdk#3238 · 4 comments · Opened Aug 3, 2026
OAuth: isLoopbackHost rejects *.localhost subdomains, breaking host-based local dev (InsecureTokenEndpointError) Open

spec-2026-07-28 v2

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

modelcontextprotocol/typescript-sdk#2591 · 4 comments · 4 reactions · Opened Jul 31, 2026
Stateful StreamableHttpServerTransport leaks the standalone GET SSE stream on session close Open

bug P1 ready for work

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

modelcontextprotocol/kotlin-sdk#922 · Opened Jul 30, 2026
`_onprogress` raises a protocol error for a race servers cannot avoid (progress notification arriving with the response) Open

bug P2 ready for work v1 v2

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

modelcontextprotocol/typescript-sdk#2580 · 4 comments · Opened Jul 30, 2026
normalizeHeaders references the bare global `HeadersInit`, breaking Node-only consumers with skipLibCheck: false Open

bug P2 ready for work v1

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

modelcontextprotocol/typescript-sdk#2568 · 1 comment · Opened Jul 28, 2026
InMemoryEventStore: standalone-stream resume broken by getStreamIdFromEventId split Open

bug P2 ready for work v1 v2

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

modelcontextprotocol/typescript-sdk#2560 · 1 comment · Opened Jul 27, 2026
Widen @hono/node-server range to ^1.19.9 || ^2 so GHSA-frvp-7c67-39w9 is reachable (npm suggests a breaking downgrade) Open

bug P2 ready for work v2

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

modelcontextprotocol/typescript-sdk#2548 · 3 comments · Opened Jul 24, 2026
[v2] MRTR wipe-cache example reads unvalidated elicitation content and defaults malformed scope to all Open

spec-2026-07-28 v2

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

modelcontextprotocol/typescript-sdk#2542 · 3 comments · Opened Jul 24, 2026
stdio.ts/ReadBuffer retains consumed input and copies the next stdio chunk Open

bug P3 ready for work v1 v2

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

modelcontextprotocol/typescript-sdk#2536 · 1 comment · Opened Jul 23, 2026
Add `ClientSession.register_tool_schema()` for dynamic tool discovery patterns Open

enhancement needs decision P3 v1 v2

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

modelcontextprotocol/python-sdk#3145 · 3 comments · Opened Jul 22, 2026
IsValidRemoteURL only blocks literal localhost/127.0.0.1 — misses [::1], 127.0.0.0/8, 0.0.0.0, and private/link-local addresses Open

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

modelcontextprotocol/registry#1465 · 1 comment · Opened Jul 20, 2026
Reject listRoots if not supported by client, without sending any request Open

enhancement good first issue P3

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

modelcontextprotocol/java-sdk#1067 · Opened Jul 19, 2026
Builder::build() silently skips configured file-based discovery when symfony/finder is missing — should fail loudly Open

needs confirmation needs maintainer action Server

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

modelcontextprotocol/php-sdk#398 · 1 reaction · Opened Jul 17, 2026
RequireAuthMiddleware omits RFC 6750 scope in WWW-Authenticate on 401/403 Open

auth bug needs confirmation P2 v1 v2

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

modelcontextprotocol/python-sdk#3103 · 2 comments · 4 reactions · Opened Jul 16, 2026
Add your HVTrust badge to the README? Open

Difficulty 1/5 Under an hour Newbie friendliness 72/100

modelcontextprotocol/ext-apps#711 · Opened Jul 15, 2026
Bug: Resumption token dropped when a resumed SSE stream disconnects before any id-bearing event Open

bug P2 ready for work v1 v2

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

modelcontextprotocol/typescript-sdk#2499 · 1 comment · Opened Jul 14, 2026
[v2] Origin and Host validators accept userinfo before allowlisted hostnames Open

v1 v2

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

modelcontextprotocol/typescript-sdk#2489 · 1 comment · Opened Jul 14, 2026
Spec: Deprecate Sampling Open

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

modelcontextprotocol/ext-apps#706 · Opened Jul 13, 2026

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