Search results

Add ClientSession.register_tool_schema() for dynamic tool discovery patterns

Status: Open.

#3145 In modelcontextprotocol/python-sdk;

· steditt opened on Jul 22, 2026

serverInfo should be within Meta instead of serverDiscover result

P0Broken core functionality, security issues, critical missing featureBroken core functionality, security issues, critical missing feature

v2Ideas, requests and plans for v2 of the SDK which will incorporate major changes and fixesIdeas, requests and plans for v2 of the SDK which will incorporate major changes and fixes

Status: Open.

#3144 In modelcontextprotocol/python-sdk;

· Yuan325 opened on Jul 22, 2026

[v1.x] Backport #2257 and cut a release: the stateless Streamable HTTP client-disconnect fix (#2064) ships only in 2.0.0 pre-releases; latest stable v1.28.1 still carries the crashing send_log_message call

Status: Open.

#3142 In modelcontextprotocol/python-sdk;

· alex-feel opened on Jul 21, 2026

OAuth client sends client_id in token body under client_secret_basic (strict servers reject as multiple auth methods)

Status: Open.

#3138 In modelcontextprotocol/python-sdk;

· benmiller-SC opened on Jul 21, 2026

Concurrent requests sharing a JSON-RPC id on one session receive each other's responses

Status: Open.

#3137 In modelcontextprotocol/python-sdk;

· touchedtone opened on Jul 19, 2026

perf: JSONRPCMessage smart union scores all four branches on every inbound message

Status: Open.

#3136 In modelcontextprotocol/python-sdk;

· sandole opened on Jul 19, 2026

Client revalidates tool results with one-shot jsonschema.validate(), recompiling the validator on every call

Status: Open.

#3133 In modelcontextprotocol/python-sdk;

· jlowin opened on Jul 19, 2026

Fix case-insensitive handling of text MIME types for FileResource

Status: Open.

#3131 In modelcontextprotocol/python-sdk;

· dchou1618 opened on Jul 19, 2026

Dispatcher mints a request id already used by a completed caller-supplied request (spec: ids MUST NOT be reused in a session)

Status: Open.

#3126 In modelcontextprotocol/python-sdk;

· ayaangazali opened on Jul 18, 2026

Image content blocks >99 bytes fail with "illegal base64 at byte 0"

Status: Open.

#3123 In modelcontextprotocol/python-sdk;

· PeeperFrog opened on Jul 18, 2026

Server._handle_message can loop forever re-logging warnings when a log handler itself emits a warning (v1.x)

Status: Open.

#3122 In modelcontextprotocol/python-sdk;

· fas89 opened on Jul 17, 2026

Recommended deployment pattern for FastMCP on AWS Lambda using Mangum

questionFurther information is requestedFurther information is requested

Status: Open.

#3121 In modelcontextprotocol/python-sdk;

· shoaib1207k opened on Jul 17, 2026