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- Status: Open.#3579 In modelcontextprotocol/python-sdk;
ClientSessionGroup raises KeyError when connecting a server that exposes no components
v1Affects the v1.x maintenance lineAffects the v1.x maintenance linev2Affects the v2 line (2.x on main)Affects the v2 line (2.x on main)Status: Open.#3578 In modelcontextprotocol/python-sdk;- Status: Open.#3576 In modelcontextprotocol/python-sdk;
func_metadata raises uncaught PydanticSchemaGenerationError for Iterator/AsyncIterator tool return annotations instead of the unstructured fallback
v1Affects the v1.x maintenance lineAffects the v1.x maintenance linev2Affects the v2 line (2.x on main)Affects the v2 line (2.x on main)Status: Open.#3573 In modelcontextprotocol/python-sdk;- Status: Open.#3572 In modelcontextprotocol/python-sdk;
- Status: Open.#3570 In modelcontextprotocol/python-sdk;
- Status: Open.#3569 In modelcontextprotocol/python-sdk;
OAuth client scope handling breaks on comma-separated scope strings
v2Affects the v2 line (2.x on main)Affects the v2 line (2.x on main)Status: Open.#3566 In modelcontextprotocol/python-sdk;Mcp-Param-* validation runs the full tools/list handler on every tools/call
spec-2026-07-28Concerns the SDK's implementation of the 2026-07-28 MCP spec revisionConcerns the SDK's implementation of the 2026-07-28 MCP spec revisionv2Affects the v2 line (2.x on main)Affects the v2 line (2.x on main)Status: Open.#3565 In modelcontextprotocol/python-sdk;OAuth HTTP routes set
CORSMiddleware(allow_origins="*")on token/register/metadata endpoints |v1Affects the v1.x maintenance lineAffects the v1.x maintenance linev2Affects the v2 line (2.x on main)Affects the v2 line (2.x on main)Status: Open.#3563 In modelcontextprotocol/python-sdk;DNS rebinding protection defaults off when
security_settingsis omitted (non-loopback binds stay unprotected) |v1Affects the v1.x maintenance lineAffects the v1.x maintenance linev2Affects the v2 line (2.x on main)Affects the v2 line (2.x on main)Status: Open.#3562 In modelcontextprotocol/python-sdk;POST failure identical to task cancellation in streamable HTTP client
v1Affects the v1.x maintenance lineAffects the v1.x maintenance linev2Affects the v2 line (2.x on main)Affects the v2 line (2.x on main)Status: Open.#3560 In modelcontextprotocol/python-sdk;