> ## Documentation Index
> Fetch the complete documentation index at: https://docs.sentfrom.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Anthropic (Claude)

> Email tools for Claude via the Anthropic Messages API.

Give Claude email tools by declaring them in the `tools` parameter and handling `tool_use` blocks.

## Install

```bash theme={null}
pip install anthropic requests
```

## Define tools and run the loop

```python theme={null}
import os, requests, anthropic

API = "https://api.sentfrom.ai/v1"
H = {"Authorization": f"Bearer {os.environ['SENTFROMAI_API_KEY']}"}
client = anthropic.Anthropic()

TOOLS = [
    {
        "name": "send_email",
        "description": "Send an email from an inbox to a recipient.",
        "input_schema": {
            "type": "object",
            "properties": {
                "inbox_id": {"type": "string"},
                "to": {"type": "string"},
                "subject": {"type": "string"},
                "body": {"type": "string"},
            },
            "required": ["inbox_id", "to", "subject", "body"],
        },
    }
]

def run_tool(name, args):
    if name == "send_email":
        return requests.post(f"{API}/messages", headers=H, json={
            "inbox_id": args["inbox_id"], "to": [args["to"]],
            "subject": args["subject"], "text": args["body"],
        }).json()

messages = [{"role": "user", "content": "Email jane@acme.com from inbox inb_123 to say hi."}]
while True:
    resp = client.messages.create(model="claude-sonnet-4-6", max_tokens=1024, tools=TOOLS, messages=messages)
    messages.append({"role": "assistant", "content": resp.content})
    tool_uses = [b for b in resp.content if b.type == "tool_use"]
    if not tool_uses:
        print(resp.content[-1].text); break
    messages.append({"role": "user", "content": [
        {"type": "tool_result", "tool_use_id": b.id, "content": str(run_tool(b.name, b.input))}
        for b in tool_uses
    ]})
```

<Tip>
  Claude Desktop and other MCP hosts can use the [SentFromAI MCP server](/guides/mcp) directly — no tool
  schemas to maintain.
</Tip>