composio-client for Python

composio-client replaces the Stainless-generated package without requiring you to rewrite existing 1.43.x calls.

from composio_client import Composio, ProjectAuth

client = Composio(auth=ProjectAuth("ak_..."))

session = client.tool_router.session.create(user_id="user@example.com")
result = client.tool_router.session.execute(
    session.session_id,
    tool_slug="GITHUB_CREATE_ISSUE",
    arguments={"owner": "composiohq", "repo": "composio", "title": "Example"},
)

The owned client preserves the public Python contract from composio-client==1.43.0 and adds the rest of the v3.1 API. You get all 113 operations, including the 64 operations published by Stainless and 49 additive operations generated from the checked-in OpenAPI document.

The September 2026 schema adds client.session_configs.list() and client.session_configs.retrieve(id), premium usage settings, workbench tool-execution controls, and trigger egress overrides. Generated public request and response types include new fields while retaining existing Stainless declarations.

Install the client

pip install composio-client

With uv:

uv add composio-client

Authenticate and scope the client

auth is required and says which Composio credential the client sends:

A fixed mode never consults the operation table. A request carries at most one credential, and only to the configured API origin.

A credential is a key or a function returning one. The function is called once per logical call and its key is reused across that call's retries and same-origin redirects. AsyncComposio also accepts an async function:

client = Composio(auth=UserAuth(lambda: vault.read("composio-user-key")))

scope routes every request to an organization, a project, or both, sent as x-org-id and x-project-id:

from composio_client import Composio, Scope, UserAuth

client = Composio(auth=UserAuth("uak_..."), scope=Scope(organization_id="org_...", project_id="pr_..."))

A header a configured owner writes cannot also come through generic headers: with auth other than NoAuth(), x-api-key, x-user-api-key and x-org-api-key are refused in default_headers, COMPOSIO_CUSTOM_HEADERS, a raw call's headers= and request_options headers; with scope set, so are x-org-id and x-project-id. Use with_options(auth=...) or with_options(scope=...) to derive a client that sends something else. with_options re-runs every constructor check; scope=None there clears the scope.

The few operations that declare x-user-api-key or x-org-id as a parameter (for example client.org.consumer.project.resolve(x_user_api_key=..., x_org_id=...)) keep their keywords. The key you pass replaces the configured auth for that call, and an x_org_id that disagrees with the configured scope fails before anything is sent.

client.auth_mode and client.scope say how a client is configured. api_key, user_api_key and org_api_key still read back a string key until 2.0.0-rc.19, and can no longer be assigned.

Configure from the environment

The constructor reads nothing from the process. from_env reads the mapping you hand it:

import os

client = Composio.from_env(os.environ, environment="staging")

A keyword argument replaces the whole field it names: auth=NoAuth() means no credential whatever the mapping holds, and default_headers= replaces COMPOSIO_CUSTOM_HEADERS rather than merging into it.

Identify the calling product

A product built on the client passes a ClientIdentity instead of setting headers by hand:

from composio_client import ClientIdentity, Composio, ProjectAuth

client = Composio(
    auth=ProjectAuth("ak_..."),
    identity=ClientIdentity(product="composio", version="0.9.0", source="PYTHON_SDK", framework="openai"),
)

product and version are sent as x-client-provenance and x-client-version (version also as x-sdk-version); source, framework and runtime as x-source, x-framework and x-runtime. The library headers (x-client-library, x-client-library-version, x-client-language) are the package's own and are refused in default_headers, COMPOSIO_CUSTOM_HEADERS and request_options headers; once identity is set, so is every identity header. A refused name raises ComposioError. ClientIdentity is frozen and validates that every value is non-empty printable ASCII.

Use the async client

import asyncio

from composio_client import AsyncComposio, ProjectAuth


async def main() -> None:
    async with AsyncComposio(auth=ProjectAuth("ak_...")) as client:
        session = await client.tool_router.session.create(user_id="user@example.com")
        print(session.session_id)


asyncio.run(main())

Read raw response metadata

Every released resource keeps the Stainless raw and streaming accessors:

from composio_client import Composio, ProjectAuth

client = Composio(auth=ProjectAuth("ak_..."))

response = client.tool_router.session.with_raw_response.retrieve("sess_123")
print(response.status_code)
session = response.parse()

with client.tool_router.session.with_streaming_response.retrieve("sess_123") as response:
    print(response.headers)

The async resource exposes the corresponding async response objects and context managers.

Handle API errors

The exception hierarchy matches the Stainless package. Existing except blocks keep working:

from composio_client import Composio, NotFoundError, ProjectAuth

client = Composio(auth=ProjectAuth("ak_..."))

try:
    client.tool_router.session.retrieve("missing")
except NotFoundError as error:
    print(error.status_code)

Migrate pre-release owned-client calls

Earlier owned-client builds accepted aggregate body, query, and headers values. Those calls remain valid during the transition:

client.tool_router.session.create({"user_id": "user@example.com"})
client.tool_router.session.config_history("sess_123", query={"limit": 25})

Prefer the flat Stainless form in new code:

client.tool_router.session.create(user_id="user@example.com")
client.tool_router.session.config_history("sess_123", limit=25)

See the Python migration guide for compatibility details and the stricter credential transport rules.

Removed in 2.0.0-rc.18

Each row is a deliberate removal of this release. The TypeScript twins are declared in packages/codegen/assignability-ledger.json; on this side the Stainless compatibility check carves out the api_key keyword by name (scripts/check_stainless_compatibility.py).

Develop the Python package

Generate from the repository root:

pnpm generate:python
pnpm codegen:check

Run Python checks from python/:

uv run ruff check
uv run ruff format --check
uv run mypy src scripts
uv run pytest
uv run python scripts/check_stainless_compatibility.py
uv build
uv run python scripts/check_stainless_compatibility.py --wheel dist/*.whl

The normal compatibility check is offline. It reads the committed 1.43.0 fixture and does not install or call the Stainless client.