Issues

• ClientCapabilities.experimental fails to decode object-valued capabilities

  modelcontextprotocol/swift-sdk#287 · Filter by author djwhelan opened on Sep 14, 2026
  1

• StatefulHTTPServerTransport: a terminated session 404s every subsequent request, including a session-less InitializeRequest — the endpoint cannot recover

  modelcontextprotocol/swift-sdk#286 · Filter by author ianegordon opened on 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

  modelcontextprotocol/swift-sdk#285 · Filter by author ianegordon opened on Sep 10, 2026

• Feature request: a static (pre-shared) Bearer token validator for local servers, without OAuth resource metadata

  modelcontextprotocol/swift-sdk#284 · Filter by author ianegordon opened on Sep 8, 2026

• NetworkTransport leaks the underlying socket (CLOSE_WAIT) when reconnection is disabled and the receive loop terminates

  modelcontextprotocol/swift-sdk#282 · Filter by author skirrellyjones opened on Sep 8, 2026

• HTTPClientTransport shares one lastEventID between all SSE streams, so the standalone GET can resume a POST stream

  modelcontextprotocol/swift-sdk#281 · Filter by author wballard opened on Aug 29, 2026

• Value decoding changes data-URL-looking JSON strings into Value.data

  bug
  modelcontextprotocol/swift-sdk#277 · Filter by author bitbemol opened on Aug 29, 2026

• Remove package.resolved which prevents consumers from using newer versions of libraries like swift log

  enhancement
  modelcontextprotocol/swift-sdk#274 · Filter by author edorphy opened on Aug 15, 2026

• Add support for custom scheme redirect URIs

  enhancement
  modelcontextprotocol/swift-sdk#272 · Filter by author balazserd opened on 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)

  modelcontextprotocol/swift-sdk#265 · Filter by author vectory-eric opened on Jul 27, 2026
  1

• StdioTransport.send() still interleaves concurrent sends under EAGAIN backpressure — #252 was closed without a merged fix

  bug
  modelcontextprotocol/swift-sdk#263 · Filter by author onetamer opened on Jul 24, 2026

• Server fails to decode ChatGPT's initialize (experimental typed [String: String], extensions unmodeled); error is returned inside an HTTP 200

  bug
  modelcontextprotocol/swift-sdk#262 · Filter by author nstrm opened on Jul 24, 2026
  1

• HTTPClientTransport fails to build on Windows: #if !os(Linux) guards no longer match the EventSource platform condition

  modelcontextprotocol/swift-sdk#261 · Filter by author ArmanS201 opened on Jul 22, 2026

• Client.connect busy-loops at 100% CPU when the transport reaches EOF before initialize completes

  modelcontextprotocol/swift-sdk#256 · Filter by author magicnight opened on Jul 11, 2026

• StatelessHTTPServerTransport: notifications/cancelled leaves the original POST hanging (HTTP exchange never completed)

  modelcontextprotocol/swift-sdk#255 · Filter by author ianegordon opened on Jul 6, 2026
  3

• StatelessHTTPServerTransport: concurrent requests sharing a JSON-RPC id overwrite each other's response waiter (hang + continuation leak)

  modelcontextprotocol/swift-sdk#254 · Filter by author ianegordon opened on Jul 6, 2026
  2

• Implement SEP-2577: Deprecate Roots, Sampling, and Logging

  modelcontextprotocol/swift-sdk#246 · Filter by author localden opened on Jun 6, 2026

• Implement SEP-2663: Tasks Extension

  modelcontextprotocol/swift-sdk#247 · Filter by author localden opened on Jun 6, 2026

• Implement SEP-2575: Make MCP Stateless

  modelcontextprotocol/swift-sdk#245 · Filter by author localden opened on Jun 6, 2026
  2

• Implement SEP-2567: Sessionless MCP via Explicit State Handles

  modelcontextprotocol/swift-sdk#244 · Filter by author localden opened on Jun 6, 2026
  1

• Implement SEP-2549: TTL for List Results

  modelcontextprotocol/swift-sdk#243 · Filter by author localden opened on Jun 6, 2026

• Implement SEP-2352: Clarify authorization server binding and migration

  modelcontextprotocol/swift-sdk#241 · Filter by author localden opened on Jun 6, 2026

• Implement SEP-2468: Recommend Issuer (iss) Parameter in MCP Auth Responses

  modelcontextprotocol/swift-sdk#242 · Filter by author localden opened on Jun 6, 2026

• Implement SEP-2351: Explicitly specify RFC 8414 well-known URI suffix for MCP

  modelcontextprotocol/swift-sdk#240 · Filter by author localden opened on Jun 6, 2026

• Implement SEP-2350: Clarify client-side scope accumulation in step-up authorization

  modelcontextprotocol/swift-sdk#239 · Filter by author localden opened on Jun 6, 2026