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Cairn is a verification substrate for AI coding agents, published by ProductOfAmerica and distributed as a small Go binary. The software falls within the developer tooling category, specifically the emerging space of infrastructure designed to support autonomous and semi-autonomous AI-assisted software development. Its purpose is to supply the foundational primitives that AI coding agents need in order to actually finish work without requiring that every claim they make be re-checked by an outside party. To accomplish this, cairn provides four core capabilities: durable memory, append-only verdicts, content-addressed evidence, and safe concurrency. Durable memory allows agents to retain state across work sessions, while the append-only verdict mechanism ensures that judgments recorded during a task cannot be silently altered after the fact. Content-addressed evidence ties claims to verifiable artifacts, and safe concurrency permits multiple agent processes to operate without corrupting shared state. Together these features produce a verdict-backed audit trail for agent work, making it possible to trace what an agent did, what it concluded, and what evidence supports those conclusions. The tool is designed to compose with Superpowers, or with any other methodology layer, rather than replacing such frameworks; it sits beneath them as the substrate that gives their workflows verifiable integrity. Typical use cases therefore include teams and individuals running AI coding agents who need trustworthy records of agent activity, auditable outputs from automated development pipelines, and a reliable foundation for methodologies that orchestrate agent behavior. The current version of cairn is 0.5.0, and the catalog lists a single published version to date, indicating an early-stage release whose pre-1.0 version number reflects ongoing development. As a compact Go binary, it is intended to be lightweight to deploy alongside existing agent tooling.
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