Mistle

Mistle is an open-source platform for running background agents that work across repositories and business tools. Designed to help teams automate practical workflows while keeping people involved, Mistle can investigate bugs, review pull requests, prepare code changes, and create work for human review. Teams can connect services such as GitHub, Slack, OpenAI, Linear, and other integrations, then configure the agent harness, repositories, tools, and setup scripts for each session.

Features include reusable snapshots with scheduled refresh options, linked accounts that attribute agent activity to the right person, and the ability to inspect, steer, and review sessions. Agents can be triggered by webhooks, app mentions, or schedules. Beyond software engineering, Mistle supports workflows across product, marketing, sales, administration, HR, finance, legal, and customer support, drawing on connected tools to research questions, prepare briefs, identify follow-ups, and draft responses.

The project is available as open-source software on GitHub and can be run locally using Docker Compose, with a dashboard for managing sessions