Skill: APM Migration (apm-migration)

Follow this 6-phase procedure when migrating a consumer project to APM. The procedure was validated across 11 project migrations during the May 2026 APM transition.

Phase 1 — Detect

Determine whether the project is greenfield (no pre-existing AI context files) or brownfield (has AGENTS.md or GEMINI.md).

Run: ls AGENTS.md GEMINI.md 2>/dev/null
Run: git ls-files AGENTS.md GEMINI.md 2>/dev/null

• Both absent (greenfield): Skip to Phase 3.
• Either present (brownfield): Proceed to Phase 2.

Phase 2 — Recover (brownfield only)

Recover pre-existing tribal knowledge before scaffolding replaces the generated files.

1. Locate commit history:

   git log --oneline -- AGENTS.md GEMINI.md

1. Extract content from the most recent commit that contains the file:

   git show <sha>:<file> > /tmp/<file>.recovered

1. If the file was never committed (untracked, in .gitignore, or working-tree only):

• Migrate-in-place: copy the file directly into .apm/instructions/<project>.instructions.md.

1. Wrap extracted content in YAML frontmatter and write to .apm/instructions/<project>.instructions.md:

   ---
   description: <project> project conventions
   applyTo: "**"
   ---
   # <project> Tribal Knowledge
   ## Hierarchy (Rule 0)
   - This file overrides global mandates for this project.

   <original content here>

1. If multiple files exist (e.g. both AGENTS.md and GEMINI.md), merge their content into one instructions file with clear section boundaries. Do not create duplicate instructions.

Phase 3 — Scaffold

Create the APM manifest and project-level instructions. This phase applies to both greenfield and brownfield paths from this point onward.

3.1 Create apm.yml

name: <project-name>
targets:
  - opencode
  - copilot
dependencies:
  apm: []
includes: auto

• <project-name> must be the repository name in kebab-case.
• Leave dependencies.apm empty — packages are installed in Phase 4.
• If the project uses additional target harnesses, add them (e.g. claude, gemini, codex).

3.2 Create .apm/instructions/<project>.instructions.md (if not already present from Phase 2)

---
description: <project> project conventions
applyTo: "**"
---
# <project> Tribal Knowledge
## Hierarchy (Rule 0)
- This file overrides global mandates for this project.

3.3 Append APM entries to .gitignore

Read the existing .gitignore first to preserve all original entries. Then append:

apm_modules/
.agents/
.opencode/
.github/instructions/
.github/prompts/
.github/agents/
.github/hooks/
.github/copilot-instructions.md
AGENTS.md
GEMINI.md

If .gitignore does not exist, create it with only the APM block. If the project already has some of these entries, do not duplicate them.

Phase 4 — Install & Compile

4.1 Determine packages

Ask the user which packages to install. If the user defers, detect from project type:

4.2 Install

apm install <package>@<marketplace> <package>@<marketplace> ...

If apm install exits with code 128 — a known APM bug caused by --shared flag on shallow clones (affects APM internals with certain git versions) — use the local-path fallback:

git clone https://github.com/pngdeity/apm-user-repository /tmp/apm-marketplace
apm install /tmp/apm-marketplace/packages/<package> /tmp/apm-marketplace/packages/<other-package>
rm -rf /tmp/apm-marketplace

4.3 Compile

apm compile --target opencode,copilot

Add additional --target flags for any harnesses declared in apm.yml.

If apm compile fails, verify that all packages installed successfully and that apm.yml targets match the compile flags.

Phase 5 — Git

5.1 Untrack generated files from version control

If AGENTS.md or GEMINI.md were previously tracked by git:

git rm --cached AGENTS.md GEMINI.md

These files are now generated by apm compile and must not be committed.

5.2 Stage only source files

git add apm.yml apm.lock.yaml .gitignore .apm/instructions/

Never stage generated files (AGENTS.md, GEMINI.md, .github/copilot-instructions.md, .github/instructions/, .github/prompts/, .github/agents/).

5.3 Commit

git commit -m "Add APM manifest with <package-list>"

Sign the commit if the project requires signed commits (git commit -S).

Phase 6 — Verify

Run each check and report the result as [✓] or [✗] with details for any failures.

1. git show --stat HEAD            — only source files committed
2. cat apm.yml                     — correct targets, includes: auto
3. cat .gitignore                  — all original entries preserved + APM block
4. head -30 AGENTS.md              — tribal knowledge present, APM sections present
5. apm compile --target ...        — exits 0
6. git status --short              — clean

Expected results:

[✓] git show --stat HEAD            — apm.yml, apm.lock.yaml, .gitignore, .apm/instructions/
[✓] apm.yml                         — targets opencode, copilot
[✓] .gitignore                      — original entries preserved + APM block
[✓] AGENTS.md                       — tribal knowledge + APM sections
[✓] apm compile --target opencode,copilot — exits 0
[✓] git status --short              — clean

If any check fails:

• Check 1 fails: Staged generated files. Unstage them with git reset HEAD <file>.
• Check 2 fails: Fix apm.yml targets and recompile.
• Check 3 fails: Re-append missing APM entries to .gitignore.
• Check 4 fails: Verify .apm/instructions/<project>.instructions.md contains original content and recompile.
• Check 5 fails: Inspect error output. Common causes: missing dependencies, target mismatch, or malformed apm.yml.
• Check 6 fails: Untracked generated files exist. Add them to .gitignore or clean with git clean -fd --exclude=!apm_modules --exclude=!.agents.