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Windows MCP SSH stdio transport closes after initialize when PROGRAMDATA is missing from inherited environment
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.#3335 In modelcontextprotocol/python-sdk;Add add_resource_template() to MCPServer
v2Affects the v2 line (2.x on main)Affects the v2 line (2.x on main)Status: Open.#3333 In modelcontextprotocol/python-sdk;[v2] Expose the SSE max_event_size setting in Streamable HTTP clients
v2Affects the v2 line (2.x on main)Affects the v2 line (2.x on main)Status: Open.#3332 In modelcontextprotocol/python-sdk;streamable-http client: no size bound before JSONRPCMessage.model_validate_json — one large server message can OOM the 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.#3330 In modelcontextprotocol/python-sdk;docs: no guidance for supporting SDK 1.x and 2.x at the same time
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.#3309 In modelcontextprotocol/python-sdk;Streamable HTTP clean EOF reconnects can exceed the request retry budget
bugSomething isn't workingSomething isn't workingneeds confirmationNeeds confirmation that the PR is actually required or needed.Needs confirmation that the PR is actually required or needed.P2Moderate issues affecting some users, edge cases, potentially valuable featureModerate issues affecting some users, edge cases, potentially valuable featurev1Affects 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.#3307 In modelcontextprotocol/python-sdk;A tool returning an empty list produces a CallToolResult with zero content blocks
enhancementRequest for a new feature that's not currently supportedRequest for a new feature that's not currently supportedneeds decisionIssue is actionable, needs maintainer decision on whether to implementIssue is actionable, needs maintainer decision on whether to implementP2Moderate issues affecting some users, edge cases, potentially valuable featureModerate issues affecting some users, edge cases, potentially valuable featurev1Affects 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.#3305 In modelcontextprotocol/python-sdk;check_resource_allowed(): path matching skips dot-segment/percent-encoding normalization (auth-boundary bypass)
authIssues and PRs related to Authentication / OAuthIssues and PRs related to Authentication / OAuthbugSomething isn't workingSomething isn't workingneeds confirmationNeeds confirmation that the PR is actually required or needed.Needs confirmation that the PR is actually required or needed.P2Moderate issues affecting some users, edge cases, potentially valuable featureModerate issues affecting some users, edge cases, potentially valuable featurev1Affects 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.#3303 In modelcontextprotocol/python-sdk;Cleanly terminated streamable-HTTP sessions are never deregistered: the DELETE path skips its own cleanup
bugSomething isn't workingSomething isn't workingneeds confirmationNeeds confirmation that the PR is actually required or needed.Needs confirmation that the PR is actually required or needed.P3Nice to haves, rare edge casesNice to haves, rare edge casesv1Affects 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.#3300 In modelcontextprotocol/python-sdk;find_context_parameter treats a Context return annotation as a parameter
P3Nice to haves, rare edge casesNice to haves, rare edge casesv1Affects 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.#3298 In modelcontextprotocol/python-sdk;resource_url_from_server_url preserves explicit default ports
P3Nice to haves, rare edge casesNice to haves, rare edge casesv1Affects 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.#3297 In modelcontextprotocol/python-sdk;docs: clarify when Client(raise_exceptions=True) actually raises
P3Nice to haves, rare edge casesNice to haves, rare edge casesv1Affects 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.#3287 In modelcontextprotocol/python-sdk;