# 0015 — AGENTS.md refactor (prerequisite)

**Type:** HITL  
**Parent PRD:** `docs/prd/chunk-3-skills-library.md`

## What to build

Implement ADR-0012: create two AGENTS.md files and slim both CLAUDE.md files to thin adapters. As much provider-agnostic content as possible migrates to each respective AGENTS.md; only Claude Code-specific syntax (`@import`, inline `@file` directives) stays in the adapters.

**Repo-level** `AGENTS.md` (new, at repo root):
- Receives all provider-agnostic content from repo-level `CLAUDE.md`: working context, structure description, key rules (provider-agnostic core, sync model, edit discipline), the key documents list expressed in plain prose (no `@import` syntax)
- Repo-level `CLAUDE.md` becomes: `@AGENTS.md` + Claude Code-specific additions (`@CONTEXT.md` auto-load, any `@import` directives)

**Global** `core/AGENTS.md` (new, deployed to `~/.agents/AGENTS.md` via `install.sh`):
- Receives all provider-agnostic content from `providers/claude-code/CLAUDE.md`: Communication rules, Behavior rules
- `providers/claude-code/CLAUDE.md` becomes: `@~/.agents/AGENTS.md` + Claude Code-specific additions (`@import` for `governance.md`, content index `@import` directives)

AGENTS.md files must be self-contained — no `@import` syntax. Where a file was previously auto-loaded via `@file` in CLAUDE.md, the AGENTS.md equivalent states the same instruction in plain prose.

`docs/spec/architecture.md` is updated in this PR (per "updated in same PR as structural change" convention).

HITL gate: human reviews both content splits, runs a fresh-session behavioral test to confirm all previously always-on rules still apply, and approves before committing.

## Acceptance criteria

- [ ] `AGENTS.md` exists at repo root; contains all provider-agnostic content from repo-level `CLAUDE.md`; no `@import` syntax
- [ ] Repo-level `CLAUDE.md` contains `@AGENTS.md` + Claude Code-specific additions only; no duplicated always-on content
- [ ] `core/AGENTS.md` exists; contains Communication and Behavior rules from `providers/claude-code/CLAUDE.md`; no `@import` syntax
- [ ] `providers/claude-code/CLAUDE.md` contains `@~/.agents/AGENTS.md` + `@import` directives only; no duplicated always-on content
- [ ] `install.sh` deploys `core/AGENTS.md` → `~/.agents/AGENTS.md`
- [ ] `docs/spec/architecture.md` updated with AGENTS.md entries in the file structure
- [ ] **HITL:** human confirms no always-on rule was lost or duplicated across the split
- [ ] **HITL:** human runs fresh-session behavioral test confirming governance, communication, and behavior rules all apply without any manual load step

## Blocked by

None — can start immediately.