How To Use Mentat
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What it is
Mentat is an open-source command-line coding assistant from AbanteAI that plans and applies multi-file edits directly from your terminal.
Install / sign up
Mentat predates the current wave of agent CLIs and is still a clean, scriptable option. You give it a set of files and a natural-language task; it proposes a diff covering all of them, shows you the patch, and applies it on confirmation. It’s BYO-API-key and works with OpenAI, Anthropic, or local models via LiteLLM.
First session
From your project root, run mentat with the files (or directories) you want in context. Type your request at the prompt, review the proposed diff, and approve.
Everyday workflows
Mentat respects .gitignore and will refuse to touch files outside the paths you pass, which is a nice safety default. For very large repos, combine it with a grep step to narrow context before invoking the agent.
Gotchas and tips
Because it produces unified diffs, merge conflicts with uncommitted work will abort the apply step cleanly — commit or stash first. Switch models mid-session with /model gpt-4o or /model claude-sonnet-4.
Who it’s for
Terminal-native developers who prefer a lean, diff-first workflow over heavyweight IDE integrations, and anyone who wants to scrip agent edits into a pipeline.