# Keystone (ChatGPT Plugin)

> Plan, build, review, and ship

- Type: plugin
- Publisher: static-var
- Categories: Development
- Website: https://chatgpt.com/plugins/plugins_6a512fae91f881918208460aae465ff9
- Open in ChatGPT: https://chatgpt.com/plugins/plugins_6a512fae91f881918208460aae465ff9
- Version: 2.0.4
- Listed: 2026-10-15

## About

Keystone helps developers move from ambiguity to verified delivery with 9 focused skills for understanding codebases, planning changes, implementing and refactoring safely, diagnosing failures, reviewing work, and shipping with evidence. Each skill keeps the current phase explicit, protects user-owned work, and requires proof before completion claims.

## Install

1. **Add it in ChatGPT** Open Plugins in the ChatGPT sidebar (web or desktop), search for “Keystone” and select +. You'll be asked to sign in to any connected service on first use. Then type @ in a chat to call it.

## Skills

- **change-review**: Project change review for a concrete diff, branch, PR, patch, migration, fix, implementation result, or project plan that needs a new evidence-backed readiness verdict, or when another Keystone skill needs the Review Gate evaluated.
- **context-survey**: Project context survey for repository reconnaissance or project decisions that require evidence from existing code, project documentation, or project-specific external sources before planning or changing the project.
- **implementation**: Executable-software implementation in an identified software project for features, diagnosed fixes, migrations, integrations, and build or release automation. Select only when the requested change alters runtime, API, data, build, or release behavior and requires project-specific verification of integrated effects.
- **product-planning**: Software product planning for a concrete software or digital-product initiative whose behavior, UX, user-facing copy, technical direction, scope, or acceptance criteria must be shaped before implementation, or whose approved direction must become a specification.
- **project-audit**: Project health audit for a concrete software repository or product subsystem. Use when its tooling, CI, dependencies, configuration, tests, documentation, packaging, architecture, or agent instructions need a whole-system condition and risk assessment.
- **refactoring**: Program source-code refactoring for an explicit structural code improvement to structure, ownership, types, or duplication that preserves identified executable behavior. Select only when the request requires a structural code change with project-specific invariant proof, or enters through a canonical handoff from another Keystone skill.
- **root-cause-analysis**: Project debugging for a concrete failure in a software or product system. Use for a reproducible or evidence-bearing regression, failing test/build, runtime or integration defect, flake, data corruption, or performance anomaly, or when another Keystone skill needs the cause proven.
- **shipping**: Project shipping is authorized immediate delivery execution for identified, already-completed software work. Select only when the user explicitly authorizes an immediate concrete action to commit, push, prepare or create a PR, merge, tag, package, publish, release, deploy, perform an exact repository handoff, or perform destructive cleanup of an exact named completed-delivery target. A canonical handoff qualifies only when it carries the verbatim explicit delivery request and a non-empty exact authorized action set. Context Survey owns pre-authorization cleanup-target reconnaissance while approval is pending.
- **task-creation**: Project delivery breakdown for a concrete software or product goal. Use when that goal needs implementation slices, milestones, dependencies, verification gates, or agent-ready work, or when another Keystone skill hands off a shaped goal for sequencing.

## Example prompts

- "Survey this repository and explain what is true before we decide what to change."
- "Reproduce this failing test and prove the root cause before proposing a fix."
- "Review this branch for correctness, regressions, security risks, and missing tests without editing it."

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Source: https://chatgptplugins.directory/plugins/keystone · Index: https://chatgptplugins.directory/llms.txt · Independent and community-run. Not affiliated with or endorsed by OpenAI. ChatGPT is a trademark of OpenAI.