improve(development-codebase-tools): rewrite pattern-learner agent with grounded, actionable instructions

[wkoutre]

Summary

• Rewrote pattern-learner-agent from 460+ lines of theoretical YAML templates to 110 lines of grounded, actionable instructions
• Removed non-standard frontmatter fields (version, capabilities, domain, priority) that Claude Code does not recognize
• Added model: sonnet for appropriate model selection
• Added "When to Use" section for better orchestrator routing
• Grounded the agent in actual Claude Code tools (file reading, grep, git history) instead of imaginary data sources (execution_data, agent_interactions)
• Added confidence classification system (strong/moderate/weak) and structured Pattern Report output format
• Bumped plugin version 2.1.1 → 2.1.2 (patch)

What changed

The previous pattern-learner-agent was aspirational — it described theoretical meta-learning algorithms, scoring frameworks, and data sources that don't exist in Claude Code. The rewrite makes it a practical codebase pattern extraction agent that:

1. Reads actual source files, configs, and git history
2. Identifies real naming, architecture, error-handling, testing, and import patterns
3. Requires 3+ examples before reporting a pattern (evidence over opinion)
4. Classifies patterns by confidence level (strong/moderate/weak)
5. Produces a structured Pattern Report with specific file:line citations

Test plan

• Plugin validation passes (node scripts/validate-plugin.cjs)
• Markdown linting passes (markdownlint-cli2)
• Nx format passes (nx format:write --uncommitted)
• All pre-commit hooks pass (format, lint, lint-markdown, test, typecheck)

AI-Generated Description

Summary

• Rewrote pattern-learner-agent from 460+ lines of theoretical YAML templates to 110 lines of grounded, actionable instructions
• Removed non-standard frontmatter fields (version, capabilities, domain, priority) that Claude Code does not recognize
• Added model: sonnet for appropriate model selection
• Added "When to Use" section for better orchestrator routing
• Grounded the agent in actual Claude Code tools (file reading, grep, git history) instead of imaginary data sources (execution_data, agent_interactions)
• Added confidence classification system (strong/moderate/weak) and structured Pattern Report output format
• Bumped plugin version 2.1.1 → 2.2.0 (minor, since agent behavior changed significantly)

What changed

The previous pattern-learner-agent was aspirational — it described theoretical meta-learning algorithms, scoring frameworks, and data sources that don't exist in Claude Code. The rewrite makes it a practical codebase pattern extraction agent that:

1. Reads actual source files, configs, and git history
2. Identifies real naming, architecture, error-handling, testing, and import patterns
3. Requires 3+ examples before reporting a pattern (evidence over opinion)
4. Classifies patterns by confidence level (strong/moderate/weak)
5. Produces a structured Pattern Report with specific file:line citations

Test plan

• Plugin validation passes (node scripts/validate-plugin.cjs)
• Markdown linting passes (markdownlint-cli2)
• Nx format passes (nx format:write --uncommitted)
• All pre-commit hooks pass (format, lint, lint-markdown, test, typecheck)

[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

Project	Deployment	Actions	Updated (UTC)
ai-toolkit-slack-oauth-backend	Ready	Preview, Comment	Apr 14, 2026 4:09pm

[github-actions]

🤖 Claude Code Review

✅ Review complete

Re-Review Summary

This PR rewrites the pattern-learner-agent from a theoretical meta-learning agent (focused on agent execution traces) into a practical codebase pattern extraction specialist. The new version is significantly more useful — it has clear inputs, a concrete process, evidence-based confidence levels, and a structured output template.

Changes Reviewed

1. pattern-learner.md: Complete rewrite from 466 lines of abstract YAML-heavy spec to 110 lines of focused, actionable agent instructions. The new agent analyzes source code for real conventions rather than analyzing agent execution traces.

2. Version bump: Updated from 2.1.1 → 2.2.0 in plugin.json and root CLAUDE.md version table. This correctly reflects the previous review feedback — this is a minor (behavioral) change, not a patch.

3. CLAUDE.md description update: Pattern-learner-agent description updated to match the new behavior.

Assessment

The rewrite is a clear improvement:

• The old agent was over-engineered with abstract YAML schemas for "execution trace analysis", "pattern learning algorithms", and "contextual similarity clustering" — none of which mapped to concrete tool use
• The new agent is grounded: it reads files, extracts patterns with 3+ examples, classifies confidence, and produces a structured report
• The model: sonnet addition is appropriate for this analysis-heavy, non-code-generating agent
• Version bump to 2.2.0 correctly addresses the prior review feedback

No bugs, security issues, or data concerns found.

---

_{💡 Want a fresh review? Add a comment containing @request-claude-review to trigger a new review at any time.}

[github-actions]

📚 Documentation Check ✅

Verdict: Passed

Plugin version was bumped (2.1.1 → 2.2.0), root CLAUDE.md version table updated, and plugin CLAUDE.md description updated. All required documentation changes are present.

---

Documentation Check Summary

PR #449 modifies 4 files in the development-codebase-tools plugin:

1. Root CLAUDE.md — Version table updated: development-codebase-tools 2.1.1 → 2.2.0 ✅
2. plugin.json — Version bumped: 2.1.1 → 2.2.0 ✅ (required, satisfies fail_on_missing_version)
3. Plugin CLAUDE.md — pattern-learner-agent description updated to reflect new purpose ✅
4. agents/pattern-learner.md — Major rewrite: changed from meta-learning agent (analyzing agent executions) to a codebase pattern extraction specialist (analyzing source code conventions)

All critical documentation requirements are met. A changelog entry could be added to document the significant behavioral change of the pattern-learner-agent, but this is informational only given fail_on_missing_docs: false.

Missing Updates

Type	File	Severity	Reason
📝 changelog	packages/plugins/development-codebase-tools/CHANGELOG.md	ℹ️ info	The pattern-learner-agent was significantly rewritten — its purpose changed from meta-learning (analyzing agent execution traces) to codebase pattern extraction (analyzing source code conventions). A changelog entry would help users understand this behavioral change when upgrading to 2.2.0.

✨ No Documentation Updates Needed

All documentation appears to be up to date with the code changes.

---

_{🤖 Generated by Claude Documentation Validator | Mode: suggest}

[github-actions]

📋 Review verdict: APPROVE

👆 The main review comment above is the source of truth for this PR review. It is automatically updated on each review cycle, so always refer to it for the most current feedback.

This formal review submission is for the verdict only. 2 inline comment(s) are attached below.

[github-actions]

Minor: the model: sonnet addition is a good practice for cost control on this analysis-heavy agent. Worth noting this is a new field not present in the old version.

[wkoutre]

Good catch — model: sonnet is indeed a new field introduced in this rewrite. It is a valid Claude Code agent frontmatter field (supported since the claude-agent spec added model selection), and was intentionally added here to constrain cost on this analysis-heavy agent. The old version did not include it because it predated this field.

[github-actions]

The author's explanation is clear and the model: sonnet addition is appropriate for this analysis-heavy agent. No further action needed.

[github-actions]

🤖 Claude PR Metadata Generation

Status: ❌ Error
Job: View workflow run

---

⚠️ Generation Failed

The automated PR title and description generation encountered an error.

Next Steps:

1. Check the workflow logs for details
2. Verify the GitHub Actions configuration
3. Ensure the Anthropic API key is valid

---

You can manually set the PR title and description, or re-trigger by pushing a new commit.

Superseded by new review after PR update

[github-actions]

📋 Review verdict: APPROVE

👆 The main review comment above is the source of truth for this PR review. It is automatically updated on each review cycle, so always refer to it for the most current feedback.

This formal review submission is for the verdict only.