Purpose

You generate or update the skill registry — a catalog of all available skills (user-level and project-level) that the orchestrator reads once per session and uses to pass pre-resolved skill paths to sub-agents. Sub-agents do NOT read the registry themselves; the orchestrator resolves all paths and injects them into each sub-agent's launch prompt.

When to Run

• After installing or removing skills
• After setting up a new project
• When the user explicitly asks to update the registry
• As part of sdd-init (it calls this same logic)

What to Do

Step 1: Scan User Skills

1. Glob for */SKILL.md files across ALL known skill directories. Check every path below — scan ALL that exist, not just the first match:

   User-level (global skills):

   • ~/.claude/skills/ — Claude Code
   • ~/.config/opencode/skills/ — OpenCode
   • ~/.gemini/skills/ — Gemini CLI
   • ~/.cursor/skills/ — Cursor
   • ~/.copilot/skills/ — VS Code Copilot
   • The parent directory of this skill file (catch-all for any tool)

   Project-level (workspace skills):

   • {project-root}/.claude/skills/ — Claude Code
   • {project-root}/.gemini/skills/ — Gemini CLI
   • {project-root}/.agent/skills/ — Antigravity (workspace)
   • {project-root}/skills/ — Generic

2. SKIP sdd-* and _shared — those are SDD workflow skills, not coding/task skills

3. Also SKIP skill-registry — that's this skill

4. Deduplicate — if the same skill name appears in multiple locations, keep the project-level version (more specific). If both are user-level, keep the first found.

5. For each skill found, read only the frontmatter (first 10 lines) to extract:

   • name field
   • description field → extract the trigger text (after "Trigger:" in the description)

6. Build a table of: Trigger | Skill Name | Full Path

Step 2: Scan Project Conventions

1. Check the project root for convention files. Look for:
   • agents.md or AGENTS.md
   • CLAUDE.md (only project-level, not ~/.claude/CLAUDE.md)
   • .cursorrules
   • GEMINI.md
   • copilot-instructions.md
2. If an index file is found (e.g., agents.md, AGENTS.md): READ its contents and extract all referenced file paths. These index files typically list project conventions with paths — extract every referenced path and include it in the registry table alongside the index file itself.
3. For non-index files (.cursorrules, CLAUDE.md, etc.): record the file directly.
4. The final table should include the index file AND all paths it references — zero extra hops for sub-agents.

Step 3: Write the Registry

Build the registry markdown:

# Skill Registry

**Orchestrator use only.** Read this registry once per session to resolve skill paths, then pass pre-resolved paths directly to each sub-agent's launch prompt. Sub-agents receive the path and load the skill directly — they do NOT read this registry.

## User Skills

| Trigger | Skill | Path |
|---------|-------|------|
| {trigger from frontmatter} | {skill name} | {full path to SKILL.md} |
| ... | ... | ... |

## Project Conventions

| File | Path | Notes |
|------|------|-------|
| {index file} | {path} | Index — references files below |
| {referenced file} | {extracted path} | Referenced by {index file} |
| {standalone file} | {path} | |

Read the convention files listed above for project-specific patterns and rules. All referenced paths have been extracted — no need to read index files to discover more.

Step 4: Persist the Registry

This step is MANDATORY — do NOT skip it.

A. Always write the file (guaranteed availability):

Create the .atl/ directory in the project root if it doesn't exist, then write:

.atl/skill-registry.md

B. If engram is available, also save to engram (cross-session bonus):

mem_save(
  title: "skill-registry",
  topic_key: "skill-registry",
  type: "config",
  project: "{project}",
  content: "{registry markdown from Step 3}"
)

topic_key ensures upserts — running again updates the same observation.

Step 5: Return Summary

## Skill Registry Updated

**Project**: {project name}
**Location**: .atl/skill-registry.md
**Engram**: {saved / not available}

### User Skills Found
| Skill | Trigger |
|-------|---------|
| {name} | {trigger} |
| ... | ... |

### Project Conventions Found
| File | Path |
|------|------|
| {file} | {path} |

### Next Steps
The orchestrator reads this registry once per session and passes pre-resolved skill paths to sub-agents via their launch prompts.
To update after installing/removing skills, run this again.

Rules

• ALWAYS write .atl/skill-registry.md regardless of any SDD persistence mode
• ALWAYS save to engram if the mem_save tool is available
• SKIP sdd-*, _shared, and skill-registry directories when scanning
• Only read frontmatter (first 10 lines) — do NOT read full skill files
• Include ALL convention index files found (not just the first)
• If no skills or conventions are found, write an empty registry (so sub-agents don't waste time searching)
• Add .atl/ to the project's .gitignore if it exists and .atl is not already listed