Code reviewer agent

npm install @agentskit/runtime @agentskit/adapters @agentskit/tools @agentskit/skills

import { createRuntime } from '@agentskit/runtime'
import { anthropic } from '@agentskit/adapters'
import { shell, filesystem } from '@agentskit/tools'
import type { SkillDefinition } from '@agentskit/core'

const reviewer: SkillDefinition = {
  name: 'code_reviewer',
  description: 'Reviews local diffs against main, focusing on bugs, missing tests, and style.',
  systemPrompt: `You are a senior TypeScript engineer reviewing a pull request.

Workflow:
1. Run \`git diff main\` and read the full diff
2. Identify changed files; read them in full when context matters
3. Run the test suite (\`pnpm test\`) and inspect failures
4. Produce a structured review with severity per comment

Output format (markdown):
## Verdict
APPROVE | REQUEST_CHANGES | COMMENT

## Comments
- **[severity]** file:line — Issue. Suggestion.

Severities: high (must fix), medium (should fix), low (nice to have).

Always:
- Flag missing tests as severity:high
- Flag any 'any' usage with a concrete refactor
- Verify the test runner output before approving
- Keep comments terse — quote-then-suggest`,
  tools: ['shell', 'filesystem_read'],
  temperature: 0.2,
}

const runtime = createRuntime({
  adapter: anthropic({ apiKey: KEY, model: 'claude-sonnet-4-6' }),
  tools: [shell({ allowedCommands: ['git', 'pnpm', 'cat'] }), ...filesystem({ basePath: '.' })],
  maxSteps: 20,
})

const result = await runtime.run('Review the current diff and produce a structured review.', {
  skill: reviewer,
})

console.log(result.content)
console.log(`\n— ${result.steps} steps, ${result.toolCalls.length} tool calls`)

git checkout my-branch
npx tsx review.ts

git clone https://github.com/EmersonBraun/agentskit
cd agentskit
git checkout some-pr-branch
npx tsx review.ts