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Revocation requires client_secret to be present
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.#3508 In modelcontextprotocol/python-sdk;OAuth client: authorization URL is built with a second
?when the advertisedauthorization_endpointalready carries a query (RFC 6749 §3.1)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.#3505 In modelcontextprotocol/python-sdk;- Status: Open.#3504 In modelcontextprotocol/python-sdk;
streamable HTTP client: the standalone GET stream advertises Accept: application/json but can only read text/event-stream, then gives up silently
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.#3503 In modelcontextprotocol/python-sdk;Windows stdio resolves .ps1 then fails to spawn it
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.#3496 In modelcontextprotocol/python-sdk;Streamable HTTP: ASGI application returns before the full SSE body is sent
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.#3494 In modelcontextprotocol/python-sdk;MCPServer serves subscriptions/listen and advertises listChanged=true unconditionally — hold-open streams pin serverless invocations to the platform timeout
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.#3493 In modelcontextprotocol/python-sdk;Streamable HTTP stateless servers hang clients on the listen-mode GET (_handle_get_request opens a hold-open SSE stream)
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.#3492 In modelcontextprotocol/python-sdk;ClientSessionGroup: a rejected connect_to_server leaves its transport running — the session is established before its components are validated
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.#3490 In modelcontextprotocol/python-sdk;- Status: Open.#3488 In modelcontextprotocol/python-sdk;
pkg_version() in Server.create_initialization_options doesn't guard against importlib.metadata.version() returning None
v1Affects the v1.x maintenance lineAffects the v1.x maintenance lineStatus: Open.#3487 In modelcontextprotocol/python-sdk;- Status: Open.#3486 In modelcontextprotocol/python-sdk;