modelcontextprotocol

modelcontextprotocol/typescript-sdk

The official TypeScript SDK for Model Context Protocol servers and clients

46 good first / help-wanted issues · TypeScript · last activity Jul 1, 2026

12.8K stars 1.9K forks 12.8K watchers TypeScript Other
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46 Open Issues Need Help Last updated: Jul 1, 2026

Open Issues Need Help

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Support Secure Hashed Client Secrets in OAuthRegisteredClientsStore about 10 hours ago
enhancement P3 auth v2 help wanted needs decision
modelcontextprotocol/typescript-sdk
12.8K

The official TypeScript SDK for Model Context Protocol servers and clients

TypeScript
AbortSignal cancellation throws `SdkErrorCode.RequestTimeout` instead of a distinct abort error about 18 hours ago
bug good first issue P2 fix proposed
modelcontextprotocol/typescript-sdk
12.8K

The official TypeScript SDK for Model Context Protocol servers and clients

TypeScript
update server examples to cover external authentication servers 5 days ago
documentation enhancement good first issue P3 auth
modelcontextprotocol/typescript-sdk
12.8K

The official TypeScript SDK for Model Context Protocol servers and clients

TypeScript
Docs: passing z.object() as inputSchema on v1 fails silently (empty schema) or cryptically (tools/list crash) — not covered in troubleshooting or migration guide 7 days ago
documentation enhancement good first issue P3 v2 v1
modelcontextprotocol/typescript-sdk
12.8K

The official TypeScript SDK for Model Context Protocol servers and clients

TypeScript
Streamable HTTP SSE tests assume multiple events share one fetch chunk about 1 month ago
bug good first issue P3 v2 v1
modelcontextprotocol/typescript-sdk
12.8K

The official TypeScript SDK for Model Context Protocol servers and clients

TypeScript
RegisteredTool.update() crashes with ZodObject inputSchema (passthrough schemas) about 1 month ago
bug good first issue P2 fix proposed
modelcontextprotocol/typescript-sdk
12.8K

The official TypeScript SDK for Model Context Protocol servers and clients

TypeScript
[TRACKING] non compliance with SEP-986 / tool name validation about 2 months ago
question P2 improves spec compliance needs maintainer help wanted
modelcontextprotocol/typescript-sdk
12.8K

The official TypeScript SDK for Model Context Protocol servers and clients

TypeScript
[v2] classifyNetworkError passes { cause } into SdkError's data slot, so the underlying network error never reaches Error.cause about 2 months ago
bug good first issue P2 v2 spec-2026-07-28
modelcontextprotocol/typescript-sdk
12.8K

The official TypeScript SDK for Model Context Protocol servers and clients

TypeScript
Add ways for server processes to self-terminate when host is gone about 2 months ago
enhancement P3 help wanted needs decision
modelcontextprotocol/typescript-sdk
12.8K

The official TypeScript SDK for Model Context Protocol servers and clients

TypeScript
Undici instrumentation marks successful MCP requests as aborted due to premature AbortController.abort() in SSE / StreamableHTTP transports about 2 months ago
enhancement P2 help wanted
modelcontextprotocol/typescript-sdk
12.8K

The official TypeScript SDK for Model Context Protocol servers and clients

TypeScript
relatedRequestId 0 is treated as absent by notification debounce guard 2 months ago
bug good first issue ready for work P2 fix proposed
modelcontextprotocol/typescript-sdk
12.8K

The official TypeScript SDK for Model Context Protocol servers and clients

TypeScript
docs(README): `@modelcontextprotocol/fastify` missing from middleware listing 2 months ago
bug documentation good first issue P3 fix proposed
modelcontextprotocol/typescript-sdk
12.8K

The official TypeScript SDK for Model Context Protocol servers and clients

TypeScript
notifications/cancelled is ignored for request id 0 2 months ago
bug good first issue ready for work P2 v2 fix proposed v2-fixes
modelcontextprotocol/typescript-sdk
12.8K

The official TypeScript SDK for Model Context Protocol servers and clients

TypeScript
# MCP SDK ResourceTemplate URI Validation Issue: RFC 6570 Template Matching Behavior 3 months ago
bug ready for work P2 help wanted fix proposed
modelcontextprotocol/typescript-sdk
12.8K

The official TypeScript SDK for Model Context Protocol servers and clients

TypeScript
Can we have a chatbot example that connected to multiple remote servers 5 months ago
documentation enhancement good first issue P3
modelcontextprotocol/typescript-sdk
12.8K

The official TypeScript SDK for Model Context Protocol servers and clients

TypeScript
Call schema on inputSchema validation failure 5 months ago
enhancement P3 v2 help wanted needs decision
modelcontextprotocol/typescript-sdk
12.8K

The official TypeScript SDK for Model Context Protocol servers and clients

TypeScript
Question: Tool list changed notification 5 months ago
documentation good first issue question P3 potentially close
modelcontextprotocol/typescript-sdk
12.8K

The official TypeScript SDK for Model Context Protocol servers and clients

TypeScript
Client sees "Task <id> failed" instead of the real error/result on failed tasks 6 months ago
bug good first issue ready for work P2 fix proposed
modelcontextprotocol/typescript-sdk
12.8K

The official TypeScript SDK for Model Context Protocol servers and clients

TypeScript
Bug Report-2: Missing Periodic Ping Implementation 6 months ago
enhancement P2 v2 help wanted needs decision
modelcontextprotocol/typescript-sdk
12.8K

The official TypeScript SDK for Model Context Protocol servers and clients

TypeScript
Need an example to implement dynamic client registration against an existing oauth server 7 months ago
enhancement good first issue P3 auth
modelcontextprotocol/typescript-sdk
12.8K

The official TypeScript SDK for Model Context Protocol servers and clients

TypeScript
[TypeScript] Zod's .toJSONSchema() output type incompatible with elicitInput's requestedSchema parameter 7 months ago
bug good first issue P2
modelcontextprotocol/typescript-sdk
12.8K

The official TypeScript SDK for Model Context Protocol servers and clients

TypeScript
Some transport errors are silently swallowed due to missing `onerror` callback usage 7 months ago
bug good first issue P2
modelcontextprotocol/typescript-sdk
12.8K

The official TypeScript SDK for Model Context Protocol servers and clients

TypeScript
Need to override json limit defaults for express body parser in createMcpExpressApp() 8 months ago
enhancement good first issue P3
modelcontextprotocol/typescript-sdk
12.8K

The official TypeScript SDK for Model Context Protocol servers and clients

TypeScript
Client class should throw a custom exception if the capability is unsupported 9 months ago
enhancement good first issue P3
modelcontextprotocol/typescript-sdk
12.8K

The official TypeScript SDK for Model Context Protocol servers and clients

TypeScript
typing structuredContent indirectly causes type error 10 months ago
enhancement help wanted
modelcontextprotocol/typescript-sdk
12.8K

The official TypeScript SDK for Model Context Protocol servers and clients

TypeScript
error TS2420: Class 'StreamableHTTPServerTransport' incorrectly implements interface 'Transport'. 10 months ago
bug P3 help wanted
modelcontextprotocol/typescript-sdk
12.8K

The official TypeScript SDK for Model Context Protocol servers and clients

TypeScript
Bug: `server.tool()` silently ignores ZodObject schemas and strips all arguments 10 months ago
bug ready for work P2 help wanted
modelcontextprotocol/typescript-sdk
12.8K

The official TypeScript SDK for Model Context Protocol servers and clients

TypeScript
Avoid trying SSE connection in `StreamableHTTPClientTransport` 10 months ago
bug good first issue ready for work P3
modelcontextprotocol/typescript-sdk
12.8K

The official TypeScript SDK for Model Context Protocol servers and clients

TypeScript
Streamable HTTP examples use incorrect status code for invalid session IDs 10 months ago
bug good first issue P2
modelcontextprotocol/typescript-sdk
12.8K

The official TypeScript SDK for Model Context Protocol servers and clients

TypeScript
InvalidParams error when all fields in the tool schema are optional 10 months ago
bug good first issue P2
modelcontextprotocol/typescript-sdk
12.8K

The official TypeScript SDK for Model Context Protocol servers and clients

TypeScript
StreamableHTTPClientTransport is not implementing Transport properly 10 months ago
bug good first issue P3 v2
modelcontextprotocol/typescript-sdk
12.8K

The official TypeScript SDK for Model Context Protocol servers and clients

TypeScript
Where to search actually WORKING example of using Remote MCP server aka "Connector" for Claude? 10 months ago
documentation enhancement P2 v2 help wanted
modelcontextprotocol/typescript-sdk
12.8K

The official TypeScript SDK for Model Context Protocol servers and clients

TypeScript
Support `roots/list` request from server to client 10 months ago
documentation enhancement good first issue P3
modelcontextprotocol/typescript-sdk
12.8K

The official TypeScript SDK for Model Context Protocol servers and clients

TypeScript
Allow customizable reconnection behavior for non-persistent clients 11 months ago
enhancement good first issue ready for work P1 v2
modelcontextprotocol/typescript-sdk
12.8K

The official TypeScript SDK for Model Context Protocol servers and clients

TypeScript
Prefer token endpoint auth method obtained during OAuth client registration 11 months ago
bug good first issue ready for work P2 auth
modelcontextprotocol/typescript-sdk
12.8K

The official TypeScript SDK for Model Context Protocol servers and clients

TypeScript
token_endpoint_auth_methods_supported should also support `none` 12 months ago
bug good first issue P2
modelcontextprotocol/typescript-sdk
12.8K

The official TypeScript SDK for Model Context Protocol servers and clients

TypeScript
Client#listPrompts results in MCP error -32601: Method not found 12 months ago
bug good first issue ready for work P3
modelcontextprotocol/typescript-sdk
12.8K

The official TypeScript SDK for Model Context Protocol servers and clients

TypeScript
Cannot destructure property 'requestInfo' of 'undefined' as it is undefined. 12 months ago
bug good first issue ready for work P3
modelcontextprotocol/typescript-sdk
12.8K

The official TypeScript SDK for Model Context Protocol servers and clients

TypeScript
OAuth token exchange fails with URL-encoded responses - assumes JSON format only 12 months ago
bug good first issue P2
modelcontextprotocol/typescript-sdk
12.8K

The official TypeScript SDK for Model Context Protocol servers and clients

TypeScript
onerror and other listener not remove after client close (stdio) 12 months ago
bug good first issue ready for work P3
modelcontextprotocol/typescript-sdk
12.8K

The official TypeScript SDK for Model Context Protocol servers and clients

TypeScript
pnpm fails to build 12 months ago
bug good first issue ready for work P2
modelcontextprotocol/typescript-sdk
12.8K

The official TypeScript SDK for Model Context Protocol servers and clients

TypeScript
Invalid JSON RPC requests do not respond with an error 12 months ago
bug good first issue ready for work P2 improves spec compliance
modelcontextprotocol/typescript-sdk
12.8K

The official TypeScript SDK for Model Context Protocol servers and clients

TypeScript
Subclassing McpServer causes tool invocation issues 12 months ago
bug good first issue
modelcontextprotocol/typescript-sdk
12.8K

The official TypeScript SDK for Model Context Protocol servers and clients

TypeScript
SDK Crashes on Hot Reload Due to Invalid JSON in Stdio Stream about 1 year ago
bug good first issue ready for work P1
modelcontextprotocol/typescript-sdk
12.8K

The official TypeScript SDK for Model Context Protocol servers and clients

TypeScript
SSE client is not adding headers from requestInit? in _commonHeaders method about 1 year ago
bug good first issue ready for work P2
modelcontextprotocol/typescript-sdk
12.8K

The official TypeScript SDK for Model Context Protocol servers and clients

TypeScript
Double Nesting in Tool Call Response Format about 1 year ago
bug good first issue pr welcome
modelcontextprotocol/typescript-sdk
12.8K

The official TypeScript SDK for Model Context Protocol servers and clients

TypeScript