code-reviewer
Subagent OfficialUse this agent when you need to review code for adherence to project guidelines, style guides, and best practices. This agent should be used proactively after writing or modifying code, especially before committing changes or creating pull requests. It will check for style violations, potential issu
When Claude delegates to this
- Use this agent when you need to review code for adherence to project guidelines, style guides, and best practices.
What it does
This agent should be used proactively after writing or modifying code, especially before committing changes or creating pull requests. It will check for style violations, potential issues, and ensure code follows the established patterns in CLAUDE.md. Also the agent needs to know which files to focus on for the review. In most cases this will be recently completed work which is unstaged in git (can be retrieved by running git diff). However there can be cases where this is different, make sure to specify this as the agent input when calling the agent. Typical triggers include the user asking for a review of a feature they just implemented, the assistant proactively reviewing its own newly-written code before declaring a task done, and a final pre-PR check before opening a pull request. See "When to invoke" in the agent body for worked scenarios.
Opus
Pinned to the most capable model — slower and more expensive per delegation.
Default effort
No reasoning budget declared.
Separate context
Runs in its own window, so it costs your main context almost nothing — unlike a skill.
Its system prompt
49 linesThe instructions this subagent runs under, verbatim — this is the persona it adopts once delegated to.
Shipped by 3 plugins
Installing any of these installs this subagent.
What this can do
Capabilities declared in this component's own frontmatter — not inferred.
Inherit all session tools
Declares no tool restrictions — inherits every session tool
~243 tokens of context used while enabled, before you invoke anything
Trust
94/100 · Excellent1 factor scored below maximum
Reviews
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Stop
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PostToolUse (Bash)
Security guidance plugin — pattern-based warnings on edits, git-diff-based LLM review on stop