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How to audit a whole repo for safe simplification candidates with Simplify Codebase

Get a ranked list of simplification candidates with proof records, counterexamples and blind spots, with no file changes.

Who it is forA maintainer of a large existing codebase who suspects duplicated state, orphaned abstractions or dead compatibility paths and wants a read-only review first.

The problemStatic checks flag unused-looking code but cannot prove that deleting it is safe, so teams either skip cleanup or delete things that still have consumers.

The outcomeA read-only Survey report that covers the repo, lists ranked candidates with evidence for each, and names the open questions and the next evidence needed.

What you need first

  • An AI coding agent that loads SKILL.md skills, such as Codex
  • Git, to clone the skill into the Codex user skills folder
  • The target repository checked out locally
  • Node.js 18 or newer, only if you want the optional Cleanup Map visual report

Steps

  1. Clone the skill into your Codex user skills folder with git clone https://github.com/tt-a1i/simplify-codebase.git ~/.codex/skills/simplify-codebase (inferred, check the README)
  2. Start a new task so the skill directory reloads.
  3. Open the target repository and ask the agent to use $Simplify Codebase to audit it, list the safest high-value candidates, and not modify any files.
  4. Read each proof record and check the named production, test, dynamic and external consumers.
  5. Keep the candidates whose deletion boundary and minimal verification you can confirm.

Prompt for your agent

Use $simplify-codebase on the repository at <path to repo>. Run a broad read-only Survey and do not modify any files. Expected output: ranked proof records with coverage, counterexamples, open questions and the next evidence needed. Verify that every candidate names its consumers and its deletion boundary.

Caveat. The skill cannot replace product decisions, so any candidate that touches a reachable capability, supported interface or persisted format still needs your explicit approval.

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Disclaimer

Deduped lists open-source repositories that belong to other people. We do not own, maintain, audit, or vouch for any of them, and a repo appearing here is not an endorsement or a safety check. The use cases, steps, and prompts are written by AI and may be incomplete, outdated, or just wrong. Where a use case is marked "Seen in the wild", we link to public posts where someone described something similar, but we have not verified those posts and the use case itself is still our AI's own write-up. Use all of this at your own risk. Only run code, commands, or agents on systems and accounts you are authorized to use, and read the code and every command before you run it, especially anything that touches credentials, files, or the network. Nothing here is professional, security, legal, or financial advice. All trademarks and project names belong to their respective owners, and their use here does not imply affiliation. Content is provided as is, without warranties of any kind. Found a mistake, a safety problem, or something you want removed? Email [email protected] and we will look at it promptly. Full disclaimer page