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MCP SSH transport closes immediately on Windows after "initialize" message

Status: Open.

#1822 In anthropics/anthropic-sdk-python;

· ramirocouce opened on Aug 11, 2026

output_config.format cannot take the pydantic model that output_format deprecates, and the dict workaround silently skips transform_schema

Status: Open.

#1819 In anthropics/anthropic-sdk-python;

· percymcn opened on Aug 10, 2026

transform_schema empties a patternProperties map: field can only ever be {}

Status: Open.

#1817 In anthropics/anthropic-sdk-python;

· percymcn opened on Aug 10, 2026

Streaming accumulator crashes when message_start omits usage as shown in thinking docs

Status: Open.

#1806 In anthropics/anthropic-sdk-python;

· zifeng-yw opened on Aug 6, 2026

Streaming: response pausing for a client tool while a code execution is pending never includes the container id — continuation then rejected as "container_id is required"

Status: Open.

#1801 In anthropics/anthropic-sdk-python;

· Joon-June opened on Aug 5, 2026

Self-hosted environments: outcome grader's tool results rejected with 400, so grading never completes

Status: Open.

#1790 In anthropics/anthropic-sdk-python;

· MattMencel opened on Jul 30, 2026

AsyncAnthropicBedrock blocks the event loop during AWS credential resolution or signing

Status: Open.

#1770 In anthropics/anthropic-sdk-python;

· jjurm opened on Jul 22, 2026

transform_schema raises AssertionError on valid list-form types, e.g. {"type": ["string", "null"]}

Status: Open.

#1764 In anthropics/anthropic-sdk-python;

· shamashel opened on Jul 16, 2026

First API request forks a subprocess via platform.platform() — child segfaults on macOS in long-running processes

Status: Open.

#1762 In anthropics/anthropic-sdk-python;

· ratpH1nk opened on Jul 16, 2026

Consider migrating from httpx to httpx2

Status: Open.

#1755 In anthropics/anthropic-sdk-python;

· peterlundberg opened on Jul 13, 2026

SessionToolRunner can re-execute a tool call after a stream reconnect if its result post failed

Status: Open.

#1749 In anthropics/anthropic-sdk-python;

· PranavMishra28 opened on Jul 11, 2026

[BUG] MCP connector: parallel mcp_tool_use calls stall ~300s per turn; one call per batch runs twice

Status: Open.

#1747 In anthropics/anthropic-sdk-python;

· Moosapoor opened on Jul 9, 2026