Direct to `api.anthropic.com` with full tool_use block support. When Helm runs in auto mode, this path gives you the cleanest streaming experience because the Anthropic SSE protocol is the adapter we support natively. Swap with `cf-ai-gateway` if you prefer BYOK through Cloudflare.

Install

1 · Config

Append to ENABLED_PLUGINS in wrangler.toml:

anthropic

Append to ALLOWED_HOSTS:

api.anthropic.com

2 · Secrets

Run each from your Worker project:

• wrangler secret put ANTHROPIC_API_KEY console.anthropic.com/settings/keys · must match ^sk-ant-

ANTHROPIC_API_KEY=console.anthropic.com/settings/keys

Tags

Related

• Cloudflare AI Gateway — Many providers behind one plugin with BYOK via Secrets Store.
• Codex / ChatGPT subscription — Use your ChatGPT Plus/Pro subscription instead of a separate API bill.
• OpenAI-compatible (direct) — Groq, Together, Ollama, vLLM, or anything speaking the OpenAI schema.