Fletch

Fletch is a native macOS app for engineers who build real software with AI coding agents. Running more agents stopped being the hard part. Trusting what they produce is the hard part now.

Every agent works in a sealed workspace: its own clone of your repo with its own writable .git, inside a macOS Seatbelt sandbox or its own Docker container, so nothing an agent does can reach your checkout. Every agent also queries a shared index of your repo's symbols and call graph over MCP, so it navigates your codebase instead of grepping around in it. Repeatable work runs as a workflow where each step is done when a verifiable condition holds, not when an agent says so, and budgets for turns, tokens and wall-clock are enforced by the engine. Push and pull requests run host-side, so credentials never enter a sandbox.

Several agents at once, overseen rather than babysat. Free, AGPL, public beta.