composio-anthropic
Adapts Composio tools to the Claude Messages API tool format and executes the tool calls Claude returns.
Installation
pip install composio composio-anthropic anthropic
Set COMPOSIO_API_KEY (create one at https://dashboard.composio.dev/settings) and ANTHROPIC_API_KEY in your environment.
Quickstart
AnthropicProvider is non-agentic: Claude returns tool_use blocks, handle_tool_calls executes them, and you send the results back as tool_result blocks.
import json
import anthropic
from composio import Composio
from composio_anthropic import AnthropicProvider
composio = Composio(provider=AnthropicProvider())
client = anthropic.Anthropic()
# Create a session for your user
session = composio.create(user_id="user_123")
tools = session.tools()
messages = [
{"role": "user", "content": "Send an email to john@example.com with the subject 'Hello' and body 'Hello from Composio!'"}
]
response = client.messages.create(
model="claude-opus-4-6",
max_tokens=4096,
tools=tools,
messages=messages,
)
# Agentic loop: keep executing tool calls until the model responds with text
while response.stop_reason == "tool_use":
tool_use_blocks = [block for block in response.content if block.type == "tool_use"]
results = composio.provider.handle_tool_calls(session=session, response=response)
messages.append({"role": "assistant", "content": response.content})
messages.append({
"role": "user",
"content": [
{"type": "tool_result", "tool_use_id": tool_use_blocks[i].id, "content": json.dumps(result)}
for i, result in enumerate(results)
]
})
response = client.messages.create(
model="claude-opus-4-6",
max_tokens=4096,
tools=tools,
messages=messages,
)
# Print final response
for block in response.content:
if block.type == "text":
print(block.text)
handle_tool_calls extracts every tool_use block from the response, executes the matching Composio tools through the supplied session, and returns the raw results in order. Pass user_id instead for tools fetched with tools.get(). Claude occasionally emits tool input as a JSON string instead of an object; the provider normalizes this before execution.
Building on the Claude Agent SDK instead of the Messages API? Use composio-claude-agent-sdk.
Links
- Anthropic provider docs: https://docs.composio.dev/docs/providers/anthropic
- Composio docs: https://docs.composio.dev
Release files for composio-anthropic 0.21.0
For a detailed explanation of source distributions (sdists) and built distributions (wheels), please see the package formats documentation.
Source distribution (sdist)
| File | Size | Uploaded | |
|---|---|---|---|
| composio_anthropic-0.21.0.tar.gz | 4.1 kB | Details |
Built distribution (wheel)
| File | Interpreter | ABI | Platform | Reset |
|---|---|---|---|---|
| composio_anthropic-0.21.0-py3-none-any.whl | Python 3 | none | any | Details |
Total release size: 8.4 kB
Release files / composio_anthropic-0.21.0.tar.gz
| Download URL | composio_anthropic-0.21.0.tar.gz |
|---|---|
| Size | 4.1 kB |
| Tags | Source |
|
SHA-256 checksum How to use checksums |
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No |
| Uploaded via |
twine/7.0.0 CPython/3.13.14
|
Release files / composio_anthropic-0.21.0-py3-none-any.whl
| Download URL | composio_anthropic-0.21.0-py3-none-any.whl |
|---|---|
| Size | 4.4 kB |
| Tags | Python 3 |
|
SHA-256 checksum How to use checksums |
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No |
| Uploaded via |
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