Mistle
Mistle is an open-source platform for running background engineering agents that review pull requests, investigate bugs, and prepare code changes for human review. The platform uses credential-less sandboxes with brokered access to external services, scheduled snapshots for fast session startup, and 50+ integrations including GitHub, Slack, OpenAI, and Linear. Agent work is attributed to the initiating human via linked GitHub and Slack accounts.
- Developer Tools
- AI Agents
- Artificial Intelligence
- Software Only
Funding
Raised to date
$500KRaised to date based on public sources. This may differ from the amount the company actually raised and is based only on what is publicly available on the internet.
Founders
Founder details are not available yet.
Product
Problem
Engineering teams spend significant time on repetitive tasks such as investigating bugs, reviewing pull requests, and preparing code changes, which slows down development cycles. Running automated agents for these tasks typically requires complex infrastructure setup, secure credential management, and careful sandboxing to prevent unauthorized access or system damage.
Solution
Mistle provides an open-source platform for running background engineering agents that work asynchronously across repositories, review pull requests, investigate bugs, and prepare code changes for human review. The platform uses secure sandboxes with brokered credentials, allowing agents to call external HTTP services without storing sensitive credentials inside the sandbox environment. Teams can configure agent sandboxes with specific harnesses, repositories, and tools, plus setup scripts that create and refresh reusable snapshots for fast session startup. All agent work is attributed to the human who initiated it through linked GitHub and Slack accounts, and sessions are fully inspectable so engineers can review artifacts before taking action.
Target Audience
Primary users are engineering teams and developers who need to automate code review, bug investigation, and change preparation workflows while maintaining security and human oversight.
Features
- Credential-less sandbox architecture that brokers access to external HTTP services without storing secrets inside the sandbox
- Scheduled snapshots that refresh tools and dependencies, enabling quick session startup from pre-configured environments
- 50+ integrations including GitHub, Slack, OpenAI, Linear, Jira, Datadog, Sentry, Stripe, and Google Workspace
- Support for multiple sandbox providers including E2B, Modal, and OpenComputer with organization API keys
- Model flexibility with support for OpenAI, Anthropic, DeepSeek, Fireworks AI, Kimi, MiniMax, and OpenRouter
- Account linking between GitHub and Slack so agent work maps back to the initiating human
- Local Docker Compose installer for self-hosted deployment with config preserved under `~/.mistle/local`