modelcontextprotocol/swift-sdk

The official Swift SDK for Model Context Protocol servers and clients.

Stars: 1.5k
Forks: 243
Open beginner issues: 1
Indexed issues: 72

Dominant language: Swift
License: No license data
Last GitHub push: Apr 29, 2026
Latest indexed: Sep 21, 2026
Contributing guide: Contributing guide
Code of conduct: Code of conduct
Beginner labels: No beginner labels indexed
PR merge metrics: No merged PRs in 30d

Beginner friendly Everything

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72 open issues indexed

ClientCapabilities.experimental fails to decode object-valued capabilities Open

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

modelcontextprotocol/swift-sdk#287 · 1 comment · 1 reaction · Opened Sep 14, 2026
StatefulHTTPServerTransport: a terminated session 404s every subsequent request, including a session-less InitializeRequest — the endpoint cannot recover Open

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

modelcontextprotocol/swift-sdk#286 · Opened Sep 13, 2026
Server: a notifications/cancelled that arrives before the request's handler task is registered is dropped, so the request runs to completion Open

Difficulty 3/5 1-2 days Newbie friendliness 25/100

modelcontextprotocol/swift-sdk#285 · Opened Sep 10, 2026
Feature request: a static (pre-shared) Bearer token validator for local servers, without OAuth resource metadata Open

Difficulty 5/5 Over a week Newbie friendliness 48/100

modelcontextprotocol/swift-sdk#284 · Opened Sep 8, 2026
NetworkTransport leaks the underlying socket (CLOSE_WAIT) when reconnection is disabled and the receive loop terminates Open

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

modelcontextprotocol/swift-sdk#282 · Opened Sep 8, 2026
HTTPClientTransport shares one lastEventID between all SSE streams, so the standalone GET can resume a POST stream Open

Difficulty 3/5 1-2 days Newbie friendliness 30/100

modelcontextprotocol/swift-sdk#281 · Opened Aug 29, 2026
Value decoding changes data-URL-looking JSON strings into Value.data Open

bug

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

modelcontextprotocol/swift-sdk#277 · Opened Aug 29, 2026
Remove package.resolved which prevents consumers from using newer versions of libraries like swift log Open

enhancement

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

modelcontextprotocol/swift-sdk#274 · Opened Aug 15, 2026
Add support for custom scheme redirect URIs Open

enhancement

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

modelcontextprotocol/swift-sdk#272 · Opened Aug 9, 2026
StatelessHTTPServerTransport keys per-request HTTP context by client-chosen JSON-RPC id — concurrent clients with colliding ids can observe each other's HTTPRequest (including Authorization) Open

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

modelcontextprotocol/swift-sdk#265 · 1 comment · Opened Jul 27, 2026
StdioTransport.send() still interleaves concurrent sends under EAGAIN backpressure — #252 was closed without a merged fix Open

bug

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

modelcontextprotocol/swift-sdk#263 · Opened Jul 24, 2026
Server fails to decode ChatGPT's `initialize` (`experimental` typed `[String: String]`, `extensions` unmodeled); error is returned inside an HTTP 200 Open

bug

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

modelcontextprotocol/swift-sdk#262 · Opened Jul 24, 2026
`HTTPClientTransport` fails to build on Windows: `#if !os(Linux)` guards no longer match the `EventSource` platform condition Open

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

modelcontextprotocol/swift-sdk#261 · Opened Jul 22, 2026
`Client.connect` busy-loops at 100% CPU when the transport reaches EOF before `initialize` completes Open

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

modelcontextprotocol/swift-sdk#256 · Opened Jul 11, 2026
StatelessHTTPServerTransport: notifications/cancelled leaves the original POST hanging (HTTP exchange never completed) Open

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

modelcontextprotocol/swift-sdk#255 · 3 comments · Opened Jul 6, 2026
StatelessHTTPServerTransport: concurrent requests sharing a JSON-RPC id overwrite each other's response waiter (hang + continuation leak) Open

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

modelcontextprotocol/swift-sdk#254 · 2 comments · 1 reaction · Opened Jul 6, 2026
Implement SEP-2577: Deprecate Roots, Sampling, and Logging Open

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

modelcontextprotocol/swift-sdk#246 · Opened Jun 6, 2026
Implement SEP-2663: Tasks Extension Open

Difficulty 4/5 3-5 days Newbie friendliness 38/100

modelcontextprotocol/swift-sdk#247 · Opened Jun 6, 2026
Implement SEP-2575: Make MCP Stateless Open

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

modelcontextprotocol/swift-sdk#245 · 2 comments · Opened Jun 6, 2026
Implement SEP-2567: Sessionless MCP via Explicit State Handles Open

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

modelcontextprotocol/swift-sdk#244 · 1 comment · Opened Jun 6, 2026
Implement SEP-2549: TTL for List Results Open

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

modelcontextprotocol/swift-sdk#243 · 1 reaction · Opened Jun 6, 2026
Implement SEP-2352: Clarify authorization server binding and migration Open

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

modelcontextprotocol/swift-sdk#241 · 1 reaction · Opened Jun 6, 2026
Implement SEP-2468: Recommend Issuer (iss) Parameter in MCP Auth Responses Open

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

modelcontextprotocol/swift-sdk#242 · 1 reaction · Opened Jun 6, 2026
Implement SEP-2351: Explicitly specify RFC 8414 well-known URI suffix for MCP Open

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

modelcontextprotocol/swift-sdk#240 · 1 reaction · Opened Jun 6, 2026
Implement SEP-2350: Clarify client-side scope accumulation in step-up authorization Open

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

modelcontextprotocol/swift-sdk#239 · 1 reaction · Opened Jun 6, 2026
Implement SEP-2322: Multi Round-Trip Requests Open

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

modelcontextprotocol/swift-sdk#238 · Opened Jun 6, 2026
Implement SEP-2260: Require Server requests to be associated with a Client request Open

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

modelcontextprotocol/swift-sdk#237 · Opened Jun 6, 2026
Implement SEP-2164: Standardize resource not found error code (-32602) Open

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

modelcontextprotocol/swift-sdk#235 · Opened Jun 6, 2026
Implement SEP-2207: OIDC-flavored refresh token guidance Open

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

modelcontextprotocol/swift-sdk#236 · Opened Jun 6, 2026
Implement SEP-2133: Extensions framework for MCP Open

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

modelcontextprotocol/swift-sdk#234 · Opened Jun 6, 2026
Implement SEP-2106: Tools inputSchema & outputSchema Conform to JSON Schema 2020-12 Open

Difficulty 5/5 Over a week Newbie friendliness 32/100

modelcontextprotocol/swift-sdk#233 · Opened Jun 6, 2026
Implement SEP-1865: MCP Apps - Interactive User Interfaces for MCP Open

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

modelcontextprotocol/swift-sdk#232 · Opened Jun 6, 2026
Implement SEP-414: Document OpenTelemetry Trace Context Propagation Conventions Open

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

modelcontextprotocol/swift-sdk#230 · Opened Jun 6, 2026
Implement SEP-837: Update authorization spec to clarify client type requirements Open

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

modelcontextprotocol/swift-sdk#231 · Opened Jun 6, 2026
SEP-2243: Send required Mcp-Method/Mcp-Name HTTP headers Open

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

modelcontextprotocol/swift-sdk#228 · Opened May 29, 2026
Value: add numberValue (Double?) that coerces .int and .double Open

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

modelcontextprotocol/swift-sdk#225 · Opened May 9, 2026
Showcase: Advanced MCP server built with Swift SDK — self-evolving macOS automation Open

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

modelcontextprotocol/swift-sdk#224 · Opened May 9, 2026
Grant type is hardcoded `authorization_code` for DCR Open

bug

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

modelcontextprotocol/swift-sdk#222 · 1 comment · Opened Apr 25, 2026
TypeMismatchError unrecoverable when server response doesn't round-trip through CallTool.Result codable Open

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

modelcontextprotocol/swift-sdk#220 · 3 comments · Opened Apr 22, 2026
Idempotent `initialize` for Stateless HTTP MCP Servers Open

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

modelcontextprotocol/swift-sdk#219 · 2 comments · 1 reaction · Opened Apr 19, 2026
withMethodHandler resources/read Open

enhancement

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

modelcontextprotocol/swift-sdk#218 · 7 comments · Opened Apr 19, 2026
CheckedContinuation never resumed in NetworkTransport send/receive on actor dealloc (Swift 6.3) Open

Difficulty 3/5 1-2 days Newbie friendliness 25/100

modelcontextprotocol/swift-sdk#214 · 1 comment · Opened Mar 18, 2026
Implement SEP-1686: Tasks Open

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

modelcontextprotocol/swift-sdk#191 · Opened Jan 27, 2026
Implement SEP-1319: Decouple Request Payload from RPC Methods Definition Open

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

modelcontextprotocol/swift-sdk#188 · Opened Jan 27, 2026
Implement SEP-1024: MCP Client Security Requirements Open

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

modelcontextprotocol/swift-sdk#187 · Opened Jan 27, 2026
Implement SEP-991: URL-based Client Registration (OAuth Client ID Metadata) Open

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

modelcontextprotocol/swift-sdk#186 · Opened Jan 27, 2026
Implement SEP-985: Align OAuth 2.0 Protected Resource Metadata with RFC Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

modelcontextprotocol/swift-sdk#185 · Opened Jan 27, 2026
Implement SEP-835: Enhanced Authorization Flows Open

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

modelcontextprotocol/swift-sdk#184 · Opened Jan 27, 2026
Convert Value to FoundationModels schema Open

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

modelcontextprotocol/swift-sdk#169 · 1 reaction · Opened Oct 31, 2025
HTTP Transport for servers Open

enhancement

Difficulty 4/5 3-5 days Newbie friendliness 25/100

modelcontextprotocol/swift-sdk#165 · 3 comments · 2 reactions · Opened Oct 8, 2025

A short digest of beginner-friendly GitHub issues.