Evolution Skill

This skill enables Pi Agent to self-improve continuously during development by capturing learnings, correcting errors, and validating skills.

Quick Navigation

Topic	Description
Hooks Integration	Auto-trigger evolution with Pi Agent hooks
When to Evolve	Triggers and classification
Evolution Process	Step-by-step guide
Self-Correction	Auto-fix skill errors
Self-Validation	Verify skill accuracy
Workhub Integration	Issue/PR management

---

Hooks Integration

Evolution uses Pi Agent's hooks system to automatically detect opportunities for improvement.

Hook Installation

Create or edit ~/.pi/hooks/evolution.ts:

import type { HookAPI } from "@mariozechner/pi-coding-agent/hooks";

export default function (api: HookAPI) {
  // Monitor tool results for error detection
  api.on("tool_result", async (event, ctx) => {
    if (event.tool === "bash") {
      await detectErrorPatterns(event, ctx);
    }
  });

  // Monitor session end for learning capture
  api.on("session", async (event, ctx) => {
    if (event.reason === "shutdown") {
      await promptLearningCapture(ctx);
    }
  });

  // Monitor context for new patterns
  api.on("context", async (event, ctx) => {
    await detectNewPatterns(event, ctx);
  });
}

What Hooks Do

Hook Event	Trigger	Action
tool_result	After bash command	Detect compilation errors, suggest fixes
session (shutdown)	Session ends	Prompt to capture learnings
context	Context transformation	Analyze for new patterns

---

When to Evolve

Trigger skill evolution when any of these occur during development:

Trigger	Target Skill	Priority
New coding pattern discovered	Relevant skill	High
Error/debug solution found	troubleshooting skill	High
API usage pattern learned	core/reference skill	High
Build/packaging issue resolved	deployment skill	Medium
Project structure insight	getting-started skill	Low
Core concept clarified	core skill	Low

---

Evolution Process

Step 1: Identify Knowledge Worth Capturing

Ask yourself:

• Is this a reusable pattern? (not project-specific)
• Did it take significant effort to figure out?
• Would it help other developers using Pi Agent?
• Is it not already documented in existing skills?

Step 2: Classify the Knowledge

Coding Pattern           → relevant skill (e.g., typescript, patterns)
Error/Debug Solution     → troubleshooting skill
API Usage Pattern        → core/reference skill
Build/Deploy Issue       → deployment skill
Project Structure        → getting-started skill
Core Concept/API         → core skill

Step 3: Use Workhub to Create Issue

# From project root directory
cd /path/to/project
bun ~/.pi/agent/skills/workhub/lib.ts create issue "evolution: add new pattern" [category]

Step 4: Format the Contribution

For Patterns:

## Pattern N: [Pattern Name]

Brief description of what this pattern solves.

### Implementation
\`\`\`typescript
// TypeScript code
\`\`\`

### Usage
\`\`\`typescript
// Example usage
\`\`\`

For Troubleshooting:

### [Error Type/Message]

**Symptom**: What the developer sees

**Cause**: Why this happens

**Solution**:
\`\`\`typescript
// Fixed code
\`\`\`

Step 5: Mark Evolution

Add an evolution marker above new content:

<!-- Evolution: YYYY-MM-DD | source: project-name | author: @user -->

Step 6: Submit via Workhub PR

# Create PR for your contribution
bun ~/.pi/agent/skills/workhub/lib.ts create pr "evolution: add new pattern" [category]

---

Self-Correction

When skill content causes errors, automatically correct it.

Trigger Conditions

User follows skill advice → Code fails to compile/run
                      ↓
                 Detect error
                      ↓
         Suggest correction to user
                      ↓
         Create workhub issue with fix

Correction Flow

1. Detect - Skill advice led to an error
2. Verify - Confirm the skill content is wrong
3. Suggest - Propose fix to user
4. Create Issue - Document in workhub

Correction Marker Format

<!-- Correction: YYYY-MM-DD | was: [old advice] | reason: [why it was wrong] -->

---

Self-Validation

Periodically verify skill content is still accurate.

Validation Checklist

## Validation Report

### Code Examples
- [ ] All TypeScript code compiles
- [ ] All patterns work as documented
- [ ] All examples are up-to-date

### API Accuracy
- [ ] API references are correct
- [ ] Method signatures are accurate
- [ ] Dependencies are current

### Documentation
- [ ] Instructions are clear
- [ ] Examples are complete
- [ ] Links are valid

Validation Prompt

"Please validate skills against current Pi Agent version and dependencies"

---

Workhub Integration

Evolution skill extends workhub for documentation management.

Creating Evolution Issues

# From project root
bun ~/.pi/agent/skills/workhub/lib.ts create issue "evolution: [description]" "evolution"

Issue Template

# Evolution: [Title]

## Type
- [ ] New pattern
- [ ] Error fix
- [ ] API update
- [ ] Documentation improvement

## Source
- Project: [project-name]
- File: [file-path]
- Context: [brief description]

## Content
[Detailed content to add]

## Target Skill
[Which skill should this be added to?]

## Validation
- [ ] Code tested
- [ ] Documentation updated
- [ ] Examples verified

Creating Evolution PRs

# From project root
bun ~/.pi/agent/skills/workhub/lib.ts create pr "evolution: [description]" "evolution"

PR Template

# Evolution: [Title]

## Related Issue
#issue-number

## Changes
- [ ] Added new content
- [ ] Updated existing content
- [ ] Fixed errors
- [ ] Updated examples

## Files Changed
- [file1.md]
- [file2.md]

## Testing
- [ ] Tested locally
- [ ] Verified accuracy
- [ ] Checked for side effects

---

Auto-Evolution Prompts

Use these prompts to trigger self-evolution:

After Solving a Problem

"This solution should be added to skills for future reference. Use workhub to create an evolution issue."

After Creating a Pattern

"This pattern is reusable. Let me create an evolution issue to document it."

After Debugging

"This error and its fix should be documented. Create an evolution issue in workhub."

After Completing a Feature

"Review what I learned and create evolution issues if applicable."

---

Quality Guidelines

DO Add

• Generic, reusable patterns
• Common errors with clear solutions
• Well-tested code examples
• Platform-specific gotchas
• Performance optimizations
• TypeScript/JavaScript best practices

DON'T Add

• Project-specific code
• Unverified solutions
• Duplicate content
• Incomplete examples
• Personal preferences without rationale

---

Continuous Improvement Checklist

After each development session, consider:

• Did I discover a new coding pattern?
• Did I solve a tricky error?
• Did I find a better way to structure code?
• Did I learn something about TypeScript/JavaScript?
• Did I encounter and fix a confusing issue?
• Would any of this help other developers?

If yes to any, use workhub to create an evolution issue!

---

References

• Workhub Skill
• Pi Agent Hooks
• Pi Agent Skills