Composio SDKs add custom MCP toolkits and stop retrying writes (November 3, 2026)

What you get

On November 3, 2026 Composio released Python composio 0.31.0 and TypeScript @composio/core 0.28.0 (also @composio/slim 0.28.0 and @composio/anthropic 0.11.7; all 13 Python provider packages are at 0.31.0). Both SDKs now use Composio client 2.0.1.

• Custom MCP toolkits. Create one with composio.experimental.custom_toolkits.create() in Python or composio.experimental.customToolkits.create() in TypeScript. Set user_id / userId to one user's ID for a private toolkit, or to 'all' to share it across the project. Creation returns a generated slug (and, for a private toolkit, a connect link when available); pass that slug to update() to change the name, logo or API key input copy.
• Trigger delivery. Pass type to pick webhook or polling for triggers that support both, and polling_interval / pollingInterval for the minutes between polls.
• Anthropic provider. The TypeScript Anthropic provider accepts @anthropic-ai/sdk ^0.135.0.

Prerequisites

• A Composio API key in COMPOSIO_API_KEY
• An app on the Composio Python or TypeScript SDK

Steps

1. Upgrade:

npm install @composio/core@0.28.0

pip install composio==0.31.0