Anthropic (Claude)

The native Messages API adapter: streaming, tool use, prompt caching, usage with cache reads and writes. Any Claude 5 or 4 model id.

LLM_CHAIN=anthropic,anthropic   # failover to a second endpoint is one more name
ANTHROPIC_API_KEY=sk-ant-…
ANTHROPIC_MODEL=claude-sonnet-5

Every endpoint takes the same knobs: LLM_<NAME>_TEMPERATURE (none omits it), LLM_<NAME>_BODY (JSON merged into every request), LLM_<NAME>_PRICE (input,cached,output per million, for the cost ledger), LLM_<NAME>_NOTES (a per-model notes file). Two models of one provider: LLM_FAST_PRESET=anthropic under another name. Environment has the full list.

Check it: npm run gateway, then curl localhost:8787/api/health — the llm.chain entry shows the endpoint, whether its key is set, and its state.

Provider docs: https://docs.anthropic.com

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Source: docs/providers/anthropic.md — edit it there; the site mirrors the repository.