Anthropic Python SDK v1.8.0
Anthropic Python SDK v1.8.0 introduces support for claude-opus-5-5, inline tool definitions, and MCP tool-list pinning (beta), alongside several bug fixes and documentation updates.
Why this signal matters
Anthropic Python SDK v1.8.0 introduces API support for the claude-opus-5-5 model, inline tool definitions, and beta MCP tool-list pinning. It addresses several issues, including a Python 3.13 crash when streams are left open on exit, immediate application of add tools(), sharing an evaluated permission enum across Managed Agents events, and removing reply-only params from compaction requests in tool runners. Client request param transformations were refactored to use the JSON encoder, and documentation updates were added across various API references (Dreams, User Profiles, Managed Agents).
Actionable summary
Anthropic Python SDK release v1.8.0 adds beta support for claude-opus-5-5, inline tool definitions, and MCP tool-list pinning. Fixes include resolving Python 3.13 streaming exit crashes, unifying evaluated permission enums in Managed Agents events, and ensuring tools() updates apply immediately.
- Agent usefulness
- 82/100
- Confidence
- 96%
- Canonical data
- JSON + Markdown
What builders should check
- Upgrade anthropic-sdk-python to v1.8.0 to use claude-opus-5-5, inline tool definitions, and MCP tool-list pinning.
- Verify stream-handling logic on Python 3.13 environments to ensure clean application exits.