Skill Molt

Create and improve agent skills by reflecting on sessions. Extract only what you could NOT have known before this session.

Core Principles

1. Non-inferable only: If you could discover it by reading the codebase, do not put it in a skill. Only include tooling gotchas, non-obvious conventions, and lessons from failure.
2. Procedures, not documentation: Write step-by-step actions. Never explain what something is — show what to do.
3. Human decides: Generate or update SKILL.md files but do NOT save without user approval. Present changes for review.

Routing

Determine which phase to execute:

• "What did we learn?" or session involved trial-and-error, error recovery, or non-obvious workarounds → Read references/observe-phase.md, then references/generate-phase.md
• "Improve skills" or existing skill feels outdated → Read references/observe-phase.md, then references/improve-phase.md
• "Shrink skills" or skill feels bloated or agent follows a skill instruction that leads to a wrong outcome → Read references/decay-phase.md

After generating, improving, or applying decay, always run references/validate-phase.md before presenting to the user.

When NOT to Create a Skill

Stop if ANY apply:

• The task was a one-off with no reusable pattern
• The knowledge is discoverable from the codebase (README, config files, code comments — you do NOT need to read every file; check the obvious sources first)
• An existing skill already covers 80%+ of the use case — update it instead
• The lesson is specific to one file, not a recurring pattern

Workflow Overview

Observe → Generate or Improve → Validate → Present to user
Decay → Validate → Present to user

Each phase has detailed instructions in references/. Load them only when you reach that phase.