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Subagent

Code Reviewer by owainlewis

Fresh-context adversarial code reviewer. Use for the fresh subagent review step in implement and task-to-pr, after any non-trivial change…

Type
Subagent
GitHub stars
404
License
MIT
Repo last updated
Sep 19, 2026
Source file
README.md

What Code Reviewer by owainlewis is

Code Reviewer by owainlewis is a subagent published in the owainlewis/blueprint repository on GitHub, which has about 404 stars. The repository describes itself as: “The best agent skills in the world for software development.”

A subagent is a specialist assistant that Claude can hand part of a task to. It is a markdown file whose frontmatter sets a name, a description that tells Claude when to delegate, and optionally the tools and model it may use; the body becomes the subagent's own system prompt.

Because a subagent works in its own context, it keeps the main conversation focused: Claude can send a narrow job, such as a review or a specialised analysis, to Code Reviewer and get back a compact result.

How to install Code Reviewer by owainlewis

Claude Code

  1. Download README.md from the repository.
  2. Save it to ~/.claude/agents/ to use it in every project, or to .claude/agents/ inside one project to share it through version control.
  3. Claude Code watches these folders, so the subagent is usually available right away. Ask Claude to use it by name, or @-mention it to make sure it runs.

Claude Cowork

  1. Cowork loads subagents through plugins. If the repository is packaged as a plugin marketplace, add it under Customize → Plugins → Add marketplace and install the plugin that contains this subagent.
  2. Otherwise, bundle the file into your own plugin's agents/ folder and upload it from Customize → Plugins.

New to extending Cowork? Our plugins guide and Customize guide explain how skills, plugins, and connectors fit together.

Inside the source file

An excerpt from README.md, shared under the repository's MIT license. Read the full file on GitHub.

Design. Plan. Build. Validate.

Why Blueprint · Install · Choose a skill · Read the guides · Contribute

Blueprint gives coding agents ten focused skills. They cover understanding existing code, deciding what to build, and delivering reviewed pull requests.

Why Blueprint

Capable agents do not need a script for every move. They need a clear outcome, the constraints that matter, and proof that the work is done.

Blueprint turns long-standing software engineering practice into a small set of skills: understand the system, make decisions before expensive changes, keep each task focused, test the result, and review the work. The skills say what good work looks like and what evidence is needed. They leave the mechanics to the agent.

The set is deliberately small. It contains the core skills its maintainer uses to make changes that another person can understand, test, and review. There is no agent framework to maintain. Install the skills and use only the ones the work needs.

Install

Install all ten skills with one command:

npx skills add \
  owainlewis/blueprint

That is the main installation path. Blueprint works through portable skill files, so the same repository can support Codex, Claude Code, and other compatible coding agents without separate plugin workflows.

Choose a skill

Most work starts in one of these places:

  • Document an implemented system. Use /architecture to create or update root ARCHITECTURE.md from verified code.
  • Decide how a meaningful change should work. Start with /design for a technical design ready for review.
  • Deliver a decided task. Start with /task-to-pr for a tested, independently reviewed pull request.

Use /plan when decided work needs splitting. Use /codex-issue-coordinator when one Codex task must coordinate a large batch of GitHub issues.

Small, clear changes can go straight to /task-to-pr. Blueprint asks for only as much process as the work needs.

Ten focused skills

  • Document: /architecture
  • Decide: /design, /architecture-review, /plan
  • Deliver: /task-to-pr, /codex-issue-coordinator
  • Check and improve: /test, /review, /improve
  • Present: /html-doc

Each skill owns one engineering phase or useful outcome. Repository policy stays in AGENTS.md. Writing code, branching, debugging, and committing remain normal agent abilities inside the delivery workflow.

Guides

  • Choosing the right skill explains where each skill starts and stops.
  • Common Blueprint workflows shows how the skills fit together for small changes, larger features, existing systems, and issue batches.
  • Examples contains reviewed designs and plans you can inspect or reuse.
  • Migration guide explains how to remove older Blueprint skills before upgrading.
  • Changelog records notable changes.

Project

Blueprint is deliberately small. It is not an issue tracker, an agent runtime, or a release system. It gives coding agents clear instructions for deciding, building, testing, and reviewing software.

Contributions are welcome. Read CONTRIBUTING.md before opening a pull request. Security problems should follow SECURITY.md.

Released under the MIT License.

Before you install

  • Read the whole file first. Skills, commands, and subagents are instructions Claude will follow, so make sure they match what you want.
  • Check which tools, scripts, or MCP servers it uses. Local servers and scripts run with your permissions.
  • Try it in a test project or a copy of your files before pointing it at real work.
  • Pin the version you tested, and review changes before updating.
  • Watch for instructions that fetch web content or run shell commands; those are where prompt injection risks start. See our prompt injection guide.

FAQ

What is Code Reviewer by owainlewis?

Code Reviewer by owainlewis is a subagent for Claude Code and Claude Cowork from the owainlewis/blueprint repository on GitHub. Fresh-context adversarial code reviewer. Use for the fresh subagent review step in implement and task-to-pr, after any non-trivial change…

How do I install Code Reviewer by owainlewis in Claude Code?

Download README.md from the repository. Save it to ~/.claude/agents/ to use it in every project, or to .claude/agents/ inside one project to share it through version control. Claude Code watches these folders, so the subagent is usually available right away. Ask Claude to use it by name, or @-mention it to make sure it runs.

Can I use Code Reviewer by owainlewis in Claude Cowork?

Cowork loads subagents through plugins. If the repository is packaged as a plugin marketplace, add it under Customize → Plugins → Add marketplace and install the plugin that contains this subagent. Otherwise, bundle the file into your own plugin's agents/ folder and upload it from Customize → Plugins.

Is Code Reviewer by owainlewis safe to install?

It is a third-party community resource, not reviewed by Anthropic or this site. Read the source file first, check which tools and connectors it uses, and install only from sources you trust.

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Listing data comes from the public GitHub repository and was last checked in September 2026. Excerpts are © their authors and shared under MIT. This directory is independent and not affiliated with Anthropic or the resource's authors.