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The Anthropic Python SDK reads ANTHROPIC_API_KEY from the environment by default. Authsome can supply it through the proxy or through export.

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Add Anthropic as a custom provider

Anthropic isn’t in the bundled set today. Register it as a custom provider: 
cat > /tmp/anthropic.json <<EOF
{
  "schema_version": 1,
  "name": "anthropic",
  "display_name": "Anthropic",
  "auth_type": "api_key",
  "flow": "api_key",
  "api_url": "api.anthropic.com",
  "api_key": {
    "header_name": "x-api-key",
    "header_prefix": ""
  },
  "export": {
    "env": {
      "api_key": "ANTHROPIC_API_KEY"
    }
  }
}
EOF

authsome register /tmp/anthropic.json
authsome login anthropic
Get a key from console.anthropic.com/settings/keys. See Custom providers for the full template. 
authsome run -- python my_agent.py
The SDK initializes with ANTHROPIC_API_KEY=authsome-proxy-managed. Outbound requests to api.anthropic.com are intercepted and authenticated at the proxy layer.

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Alternative: pass the key explicitly

from authsome.server.dependencies import create_auth_service
from anthropic import Anthropic

auth = create_auth_service()
client = Anthropic(api_key=auth.get_access_token("anthropic"))

resp = client.messages.create(
    model="claude-sonnet-4-5",
    max_tokens=1024,
    messages=[{"role": "user", "content": "ping"}],
)
print(resp.content[0].text)

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Multi-account workflows

authsome login anthropic --connection personal
authsome login anthropic --connection team
In code: 
key = auth.get_access_token("anthropic", connection="team")
client = Anthropic(api_key=key)

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What’s next

Custom providers

The custom-provider walkthrough.

Run agents with the proxy

The injection model.