Agentic Repo Scaffold

agentic-repo-scaffold

Turns the agentic-repo-architecture framework into committed, executable artifacts in a target repo.

Core principle: instruction files are context, not enforcement. Every architecture rule this skill writes into AGENTS.md must have a matching deterministic check in tools/verify/ and CI, or it will be violated under context pressure.

When to use / not use

• Use for: a new repo, or hardening an existing one toward agent-safe boundaries; adding the verify harness; wiring make verify; standing up .agent/ ledgers for a long refactor.
• Don't use for: writing a codebase-walkthrough doc (that's /init), or a one-file change. This is repo-infrastructure scaffolding.

Procedure

Create a todo per step.

1. Detect stack and existing surface

• Read package.json / go.mod / pyproject.toml / Cargo.toml, the build scripts, and the top-level tree.
• Classify: frontend/full-stack (Next.js/React), backend/service (API/worker/RPC/events), or general (CLI/SDK/lib/monorepo/infra). Monorepo → classify per package.
• Inventory what already exists: AGENTS.md, CLAUDE.md, any tools/verify or check scripts, .agent/, .cursor/rules, a verify command, CI workflow. Never clobber a richer existing file — extend it, or write a .proposed sibling and diff.
• Load the matching stack reference (bundled in this skill) for the authoritative layer rules / contract tables / acceptance matrix:
  • frontend → references/frontend.md
  • backend → references/backend.md
  • general → references/general.md

2. Write AGENTS.md (the architecture contract)

• Start from templates/AGENTS.template.md. Fill in: real architecture map (use the ACTUAL directory names in this repo — don't impose core/application/ports/adapters names if the repo already has a working, legible convention; map the roles onto its real paths), import rules, contract rules, file limits, the verify command, and the done-definition.
• Enrich the stack-specific sections (layer table, boundary rules, backend contract list) from the matching reference file's §6/§8. Keep it a routing map, not a knowledge dump — link to deeper docs rather than inlining them.
• If CLAUDE.md is absent, drop the thin pointer from templates/CLAUDE.pointer.md. If it exists and is substantive, leave it; just ensure it references AGENTS.md.

3. Install the verification harness

• Copy from templates/, adapting globs/paths to the repo:
  • check-giant-files.mjs (language-agnostic LOC gate; or check-giant-files.py for non-JS repos)
  • check-boundaries.mjs (forbidden-import / purity check — set the layer regexes to the repo's real paths)
  • check-generated-clean.sh (regenerate + git diff --quiet; skip if the repo has no generated code)
• Wire ONE canonical command running the full gate set. Match the repo's runner:
  • JS/TS → a verify script in package.json (typecheck → lint → unit → contract → e2e/visual where present → architecture checks).
  • Go → a make verify target (go vet → golangci-lint → go test ./... → arch/giant-file checks).
  • Python → make verify (ruff/mypy → pytest → checks).
• Use templates/Makefile.fragment or templates/package.verify.json as the starting shape.

4. Stand up .agent/ ledgers (only for genuine long-horizon work)

• Create .agent/PROGRESS.md, .agent/EVIDENCE.md, .agent/DECISIONS.md from templates/agent-ledgers/.
• These are repo-committed ledgers for multi-session refactors — not session-handoff scratch files. Name them PROGRESS/EVIDENCE/DECISIONS, commit them, and skip this step for a fresh repo with no active long refactor.

5. Optional: Cursor rules

• If the repo uses Cursor, drop the scoped .cursor/rules/*.mdc from the matching reference §8 (boundaries rule + verification rule). Skip otherwise.

6. Optional: CI gate

• If a CI workflow exists, add a job that runs the canonical verify command. If not, offer templates/ci-verify.yml (GitHub Actions). A check that isn't in CI is advisory only.

7. Verify the harness actually runs

• Run each new check script and the verify command. They must execute (even if they report pre-existing violations — that's signal, surface it). A scaffold that doesn't run is not done.
• Report: what was created/extended, which checks pass vs. flag existing debt, and the exact verify command. Do not mark done from inspection — show command output.

Notes

• Templates and the references/ blueprint ship inside this skill, so the package is self-contained.
• Be surgical: in an existing repo, adapt to its conventions rather than imposing the reference's directory names. The roles (pure core, orchestration, ports, adapters, isolated generated, thin transport) are the invariant; the names are the repo's.