A read-only conformance-audit subagent for Claude Code, Codex, and OpenCode. Hand it an approved plan and the built work; it reports where the two diverge.
Given an approved plan plus the implemented work (a branch, a diff, a set of files), it reads the actual committed code and checks it against the plan's commitments. It returns a tagged list: [MISS] for plan items that were not implemented and [DIVERGENCE] for work that contradicts a locked decision or the stated intent, each with file:line. Work that goes beyond the plan additively is treated as fine, not a divergence. When the plan names two implementations of one contract, it checks they actually agree. It never edits, commits, or pushes.
Its instructions are tool-agnostic: it uses whatever capabilities the environment exposes (the built-in file, search, and shell tools, plus any servers the project provides) and treats them as best-effort. If a capability is missing, unhealthy, or errors, it notes that and falls back rather than halting, so it works across very different setups and never stalls a fan-out because one tool is down. It stays read-only by rule, even where write-capable tools are present.
At merge-prep, before declaring a non-trivial piece of work done. Fold its findings in and fix-or-accept each before the human merge gate.
npx @ctxr/kit@latest install @ctxr/agent-implementation-auditor@ctxr/kit installs the bundle and mirrors it into the host's agent directory; the agent then appears as agent-implementation-auditor.
Releases are PR-gated and the publish step is a manual dispatch; the CI workflows (ci, release, tag-on-main, publish) carry the details.
MIT