Harness Bridge
SDK / ToolA local launcher that points Claude Code and seven other coding harnesses at any OpenAI-, Anthropic- or Responses-compatible endpoint — without editing a single config file.
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Anthropic Python SDK
Official Python client for the Anthropic API.
Official Python client for the Anthropic API — Messages, Batch, Files, Token Counting, and Vision. Idiomatic Python with sync / async / streaming; the canonical client for Claude in Python.
What it does
- Messages API with sync / async / streaming clients
- Built-in prompt caching via cache_control breakpoints
- Batch API for 50% off async workloads
- Token counting and cost estimation helpers
- Tool use with strict schema validation and tool_choice controls
When to use it
Best for Python services calling the Claude API directly, async backends doing batch processing, and notebooks / scripts that need streaming for UIs. Pairs naturally with FastAPI for serving, LangChain for orchestration, and any database for memory.
Getting started
pip install anthropic Set ANTHROPIC_API_KEY (and optionally ANTHROPIC_BASE_URL for Bedrock / Vertex) before importing.
Things to know
The SDK tracks prompt caching version differences carefully — pinning to a major version is recommended in production. For long-running batch workloads, use the AsyncAnthropic client; the sync client can hold the event loop.
Repository
anthropics/anthropic-sdk-pythonCharted
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