intent-layer

name	intent-layer
description	Set up hierarchical Intent Layer (AGENTS.md files) for codebases. Use when initializing a new project, adding context infrastructure to an existing repo, user asks to set up AGENTS.md, add intent layer, make agents understand the codebase, or scaffolding AI-friendly project documentation.
argument-hint	[/path/to/project]

Intent Layer

TL;DR: Create CLAUDE.md/AGENTS.md files that help AI agents navigate your codebase like senior engineers. Run detect_state.sh first to see what's needed.

Hierarchical AGENTS.md infrastructure so agents navigate codebases like senior engineers.

---

Sub-Skills

This skill includes specialized sub-skills that are automatically invoked when appropriate:

Sub-Skill	Location	Auto-Invoke When
git-history	git-history/SKILL.md	Creating nodes for existing code (extracts pitfalls from commits)
pr-review-mining	pr-review-mining/SKILL.md	Creating nodes for existing code (extracts pitfalls from PR discussions)
pr-review	pr-review/SKILL.md	Reviewing PRs that touch Intent Layer nodes

git-history (Auto-Invoked During Setup)

When creating nodes for directories with git history, automatically run git-history analysis to pre-populate:

• Pitfalls from bug fix commits
• Anti-patterns from revert commits
• Architecture Decisions from refactor commits
• Contracts from breaking change commits

Trigger: Creating AGENTS.md for directory with >50 commits
Action: Run git-history analysis before writing node

pr-review-mining (Auto-Invoked During Setup)

When creating nodes for directories with merged PRs, automatically run PR mining to pre-populate:

• Pitfalls from PR Risks sections and review warnings
• Contracts from Breaking Changes sections
• Architecture Decisions from Why sections and Alternatives Considered
• Anti-patterns from rejected approaches in reviews

Trigger: Creating AGENTS.md for directory with merged PRs
Action: Run pr-review-mining alongside git-history, merge findings

pr-review (Auto-Invoked for PRs)

When reviewing PRs that modify code covered by Intent Layer:

• Verify contracts are respected
• Check pitfalls are avoided
• Flag potential Intent Layer updates needed

Trigger: PR touches files under an AGENTS.md
Action: Run pr-review with --ai-generated if applicable

learning-loop (Auto-Invoked on Error Discovery)

When you discover a non-obvious gotcha during any work (not just Intent Layer setup):

• Find the nearest AGENTS.md to where the issue occurred
• Append to its Pitfalls section
• Keep the Intent Layer alive with real lessons

Trigger: Fix error caused by non-obvious behavior (API format, config quirk, etc.)
Action: Append pitfall to nearest AGENTS.md
Format:
  ### Short descriptive title
  **Problem**: What assumption failed
  **Symptom**: Error message or unexpected behavior
  **Solution**: Correct approach with code reference

Example: After fixing 'list' object has no attribute 'get' because Claude CLI output format varies:

### Claude CLI JSON output format varies

**Problem**: `claude --output-format json` can return dict or list
**Symptom**: `'list' object has no attribute 'get'`
**Solution**: Check `isinstance(data, list)` before `.get()`. See `lib/claude_runner.py:parse_claude_output()`

---

Quick Start

Step 0: Check State

scripts/detect_state.sh /path/to/project

State	Action
none	Create root file (continue below)
partial	Add Intent Layer section to existing root
complete	Use intent-layer-maintenance skill instead

Step 1: Measure

# Auto-discover all candidate directories
scripts/estimate_all_candidates.sh /path/to/project

# Or analyze structure first
scripts/analyze_structure.sh /path/to/project

Step 2: Create Root Node

Choose CLAUDE.md (Anthropic) or AGENTS.md (cross-tool). Pick template by size:

• Small (<50k tokens): references/templates.md → Small Project
• Medium (50-150k): references/templates.md → Medium Project
• Large (>150k/monorepo): references/templates.md → Large Project

Step 3: Create Child Nodes (if needed)

Signal	Action
Directory >20k tokens	Create AGENTS.md
Responsibility shift	Create AGENTS.md
Cross-cutting concern	Document at nearest common ancestor

Use child template from references/templates.md.

Step 4: Validate

scripts/validate_node.sh CLAUDE.md
scripts/validate_node.sh path/to/AGENTS.md

Checks: token count <4k, required sections, no absolute paths, no TODOs.

Step 5: Cross-Tool Compatibility

ln -s CLAUDE.md AGENTS.md  # If CLAUDE.md is primary

---

Interactive Wizard

Step-by-step guided setup with prompts at each decision point.

Step 1: Detect State

Run scripts/detect_state.sh, then based on result:

State	Action
none	Ask user: "Create CLAUDE.md or AGENTS.md as root?"
partial	Ask user: "What's the one-line TL;DR for this project?"
complete	Redirect to intent-layer-maintenance skill

Step 2: Measure & Decide

Run scripts/estimate_all_candidates.sh, then:

• Present candidates table to user
• Ask: "Which directories should get their own AGENTS.md?"

Step 3: Mine History (Auto-Invoked) — HIGHEST VALUE STEP

Before creating each node, automatically analyze both git history AND PR discussions using the mining scripts. Git-mined pitfalls are consistently the most valuable content in any node. Pitfalls discovered from real bugs (commit fixes, reverts, migrations) are far more useful than pitfalls guessed from reading code.

# Git commit analysis (extracts pitfalls, anti-patterns, decisions, contracts)
${CLAUDE_PLUGIN_ROOT}/scripts/mine_git_history.sh [directory]

# GitHub PR analysis (requires gh CLI)
${CLAUDE_PLUGIN_ROOT}/scripts/mine_pr_reviews.sh --limit 50

# Check for stale nodes (during maintenance)
${CLAUDE_PLUGIN_ROOT}/scripts/detect_staleness.sh --code-changes [directory]

mine_git_history.sh extracts from commits:

1. Bug fixes → Pre-populate Pitfalls
2. Reverts → Pre-populate Anti-patterns
3. Refactors → Pre-populate Architecture Decisions
4. Breaking changes → Pre-populate Contracts

mine_pr_reviews.sh extracts from PRs:

1. Risks sections → Pre-populate Pitfalls
2. Review warnings → Pre-populate Pitfalls
3. Breaking Changes → Pre-populate Contracts
4. Why/Alternatives → Pre-populate Architecture Decisions

Present merged findings to user: "History suggests these pitfalls: [list]. Include them?"

Step 4: Create Nodes

For root node:

• Ask user about project purpose
• Select template by size (Small/Medium/Large from references/templates.md)
• Include git-history findings in appropriate sections

For each child node:

• Ask user about directory's responsibility
• Use child template from references/templates.md
• Include git-history findings for that directory

Step 4b: Add Pre-flight Checks

For directories with history of mistakes or complex operations:

Ask: "What operations in this directory have caused problems before?"

For each risky operation identified:

1. Ask: "What would you check before doing [operation]?"
2. Convert answer to verifiable check format
3. Add to Pre-flight Checks section

Mine from history:

# Find reverts and fixes that suggest missing checks
${CLAUDE_PLUGIN_ROOT}/scripts/mine_git_history.sh [directory] | grep -i "fix\|revert"

Present findings: "These commits suggest potential checks: [list]. Add any?"

Step 5: Validate

Run scripts/validate_node.sh on all created nodes:

• Show validation results
• Offer to fix warnings/errors

Step 6: Symlink

Ask user: "Create symlink for cross-tool compatibility? (AGENTS.md → CLAUDE.md)"

If yes: ln -s CLAUDE.md AGENTS.md

---

Parallel Setup (Large Codebases)

For codebases >200k tokens, use parallel subagents to dramatically speed up exploration.

When to Use Parallel Mode

Codebase Size	Approach
<100k tokens	Sequential (standard workflow)
100-500k tokens	Parallel exploration, sequential synthesis
>500k tokens	Full parallel mode (explore + validate)

Step 1: Identify Subsystems

Run structure analysis first:

scripts/analyze_structure.sh /path/to/project

Identify 3-6 major subsystems from the output (e.g., src/api/, src/core/, src/db/).

Step 2: Parallel Exploration + History Mining

Spawn subagents for code exploration, git history, AND PR mining in parallel:

# Code exploration (one per subsystem)
Task 1: "Analyze src/api/ for Intent Layer setup. Find: code map (find-it-fast
         + key relationships), public API (exports used by others + core types),
         external dependencies, data flow, entry points, contracts, patterns,
         pitfalls. Return structured findings per section."

Task 2: "Analyze src/core/ for Intent Layer setup. Find: code map (find-it-fast
         + key relationships), public API (exports used by others + core types),
         external dependencies, data flow, entry points, contracts, patterns,
         pitfalls. Return structured findings per section."

Task 3: "Analyze src/db/ for Intent Layer setup. Find: code map (find-it-fast
         + key relationships), public API (exports used by others + core types),
         external dependencies, data flow, entry points, contracts, patterns,
         pitfalls. Return structured findings per section."

# Git history analysis (parallel with exploration)
Task 4: "Run git-history analysis on src/api/. Find bug fixes, reverts,
         refactors, and breaking changes. Return as Intent Layer findings."

Task 5: "Run git-history analysis on src/core/. Find bug fixes, reverts,
         refactors, and breaking changes. Return as Intent Layer findings."

Task 6: "Run git-history analysis on src/db/. Find bug fixes, reverts,
         refactors, and breaking changes. Return as Intent Layer findings."

# PR review mining (parallel with above)
Task 7: "Run pr-review-mining on src/api/. Extract from PR descriptions
         and review comments: pitfalls, contracts, architecture decisions.
         Return as Intent Layer findings with PR numbers."

Task 8: "Run pr-review-mining on src/core/. Extract from PR descriptions
         and review comments: pitfalls, contracts, architecture decisions.
         Return as Intent Layer findings with PR numbers."

Task 9: "Run pr-review-mining on src/db/. Extract from PR descriptions
         and review comments: pitfalls, contracts, architecture decisions.
         Return as Intent Layer findings with PR numbers."

Critical: Launch all agents in parallel (single message with multiple Task calls).

Step 3: Synthesize Results

Once all agents complete:

1. Merge code exploration + git history + PR mining findings per subsystem
2. Identify cross-cutting concerns (appear in multiple findings)
3. Place cross-cutting items in root node
4. Create child AGENTS.md for each subsystem with all sections:
   • Purpose + Design Rationale (the "why")
   • Code Map (find-it-fast + key relationships)
   • Public API (key exports + core types)
   • External Dependencies (services + failure modes)
   • Data Flow (request path)
   • Decisions (from git history + PR mining)
   • Entry Points, Contracts, Patterns
   • Pitfalls (from all sources)
   • Boundaries, Pre-flight Checks
5. Deduplicate where multiple sources found the same insight
6. Prefer PR-sourced rationale for Decisions (richer "why" context)

Step 4: Parallel Validation

Validate all nodes in parallel:

Task 1: "Run validate_node.sh on CLAUDE.md, report results"
Task 2: "Run validate_node.sh on src/api/AGENTS.md, report results"
Task 3: "Run validate_node.sh on src/core/AGENTS.md, report results"

Example Parallel Exploration Prompt

For each subsystem, use this structured prompt:

Explore [DIRECTORY] for Intent Layer documentation. Return:

## Design Rationale
[Why does this module exist? What problem does it solve? What's the core insight?]

## Code Map
### Find It Fast
| Looking for... | Go to |
[What common searches map to which files? Focus on non-obvious locations.]

### Key Relationships
[Import direction, layer rules, what depends on what]

## Public API
### Key Exports
| Export | Used By | Change Impact |
[What do OTHER modules import from here?]

### Core Types
[The 3-5 types needed to understand this area]

## External Dependencies
| Service | Used For | Failure Mode |
[External services and what happens when down]

## Data Flow
[How requests/data move through this area - simple diagram]

## Decisions
| Decision | Why | Rejected |
[Architectural choices with rationale]

## Entry Points
| Task | Start Here |
[Common tasks and where to start]

## Contracts
[Non-type-enforced invariants]

## Patterns
[How to do common tasks - sequence and non-obvious steps]

## Pitfalls
[What looks wrong but isn't? What looks fine but breaks?]

Keep findings specific to this directory. Note cross-cutting concerns separately.

Parallel Mode Benefits

Metric	Sequential	Parallel
500k token codebase	~30 min	~10 min
1M+ token codebase	~60 min	~15 min
Subsystem coverage	Variable	Consistent

---

Spec-First Workflow (Greenfield)

For projects WITHOUT existing code. Write Intent Nodes as specs, then scaffold.

Step 1: Define Scope

• What's the project vision?
• What are the major planned subsystems?
• Who are the stakeholders?

Step 2: Create Spec Root

Use "Spec Root Template" from references/templates.md:

• Vision statement (not TL;DR of existing code)
• Planned Subsystems (not discovered from code)
• Design Constraints (not extracted contracts)
• Implementation Targets (where to build first)

Step 3: Create Component Specs

For each planned subsystem, create AGENTS.md with:

• Responsibility Charter (what it will own)
• Interface Contracts (how others will call it)
• Acceptance Criteria (how we know it's done)

Step 4: AI Scaffolding

Ask Claude to scaffold against the specs:

• "Create directory structure matching the Planned Subsystems"
• "Generate interface stubs for the contracts defined"
• "Set up test fixtures based on acceptance criteria"

Step 5: Implementation Loop

Build incrementally:

1. Implement against spec
2. Update spec as requirements clarify
3. Spec nodes evolve into documentation nodes

Step 6: Transition to Maintenance

When implementation complete:

• Fill in discovered Pitfalls
• Add actual Entry Points
• Run validate_node.sh and transition to maintenance skill

---

Concepts

Why Intent Layers? (click to expand)

The Problem

AI agents reading raw code lack the tribal knowledge that experienced engineers have:

• Where to start for common tasks
• What patterns are expected
• What invariants must never be violated
• What pitfalls to avoid

The Solution

Intent Nodes (CLAUDE.md/AGENTS.md files) provide compressed, high-signal context that tells agents what matters without reading thousands of lines of code.

How It Works

• Ancestor-based loading: Reading a child node auto-loads all ancestors (T-shaped knowledge)
• Progressive disclosure: Start minimal, agents drill down when needed
• Compression: 200k tokens of code → 2k token node (100:1 ratio)

Core Rules (click to expand)

One Root Only

CLAUDE.md and AGENTS.md should NOT coexist at project root. Pick one and symlink the other for cross-tool compatibility.

Child Nodes Named AGENTS.md

Subdirectory nodes should be AGENTS.md (not CLAUDE.md) for cross-tool compatibility.

Token Budgets

• Each node: <4k tokens (prefer <3k)
• Target 100:1 compression
• If you can't compress, scope is too broad → split

What to Document

Keep: code map (non-obvious locations), public API (what others depend on), external dependencies, data flow, decisions with rationale, contracts, patterns (non-obvious steps), pitfalls Delete: obvious mappings (routes.ts → routes), type-enforced invariants, internal exports, standard patterns, tech stack lists

Effort Estimates (click to expand)

Codebase Size	Experienced	Newcomer
<50k tokens	1-2 hours	3-5 hours
50-150k tokens	3-5 hours	6-10 hours
>150k tokens	5-10 hours	10-20 hours

Budget additional time for SME interviews—tribal knowledge takes conversation to extract.

---

Resources

Scripts

Script	Purpose
detect_state.sh	Check Intent Layer state (none/partial/complete)
analyze_structure.sh	Find semantic boundaries
estimate_tokens.sh	Measure single directory
estimate_all_candidates.sh	Measure all candidates at once
validate_node.sh	Check node quality before committing
capture_pain_points.sh	Generate maintenance capture template
detect_changes.sh	Find affected nodes on merge/PR
show_status.sh	Health dashboard with metrics and recommendations
show_hierarchy.sh	Visual tree display of all nodes
review_pr.sh	Review PR against Intent Layer
capture_mistake.sh	Generate mistake report for check extraction

Sub-Skills

Sub-Skill	Location	Purpose
git-history	git-history/SKILL.md	Extract pitfalls/contracts from commit history
pr-review-mining	pr-review-mining/SKILL.md	Extract pitfalls/contracts from PR discussions
pr-review	pr-review/SKILL.md	Review PRs against Intent Layer contracts

References

File	Purpose
templates.md	Root (S/M/L) and child templates, three-tier boundaries
node-examples.md	Real-world examples
capture-protocol.md	SME interview questions
compression-techniques.md	How to achieve 100:1 compression, LCA placement
agent-feedback-protocol.md	Continuous improvement loop

---

Capture Questions

TL;DR: Ask these when documenting existing code. Focus on what agents can't infer from code itself.

Scope & Navigation

1. What does this area own? What's explicitly out of scope?
2. Where do developers commonly search? What's in non-obvious locations?
3. What are the key relationships between modules? (import direction, layers)

Public Interface

4. What exports do OTHER modules actually depend on?
5. What 3-5 types must someone understand to work here?

External Dependencies

6. What external services does this area use? What happens when they're down?

Design Rationale (the "why")

7. What problem drove the creation of this module? What pain point does it solve?
8. What's the core insight or philosophy? What would you lose if you removed it?
9. What constraints shaped the design? (performance, compatibility, team size, etc.)

Understanding & Debugging

10. How does data flow through this area? (request → response path)
11. Why were specific technical choices made? What alternatives were rejected?

Consistency & Safety

12. What invariants must hold that aren't enforced by types?
13. What patterns must be followed for common tasks?
14. What operations require verification before proceeding?

Pitfalls (highest value)

15. What repeatedly confuses new engineers?
16. What looks wrong but is correct? What looks correct but will break?

For full protocol: references/capture-protocol.md

---

When to Create Child Nodes

TL;DR: >20k tokens or responsibility shift → create. Simple utilities → don't.

Signal	Action
>20k tokens in directory	Create AGENTS.md
Responsibility shift (different owner/concern)	Create AGENTS.md
Hidden contracts/invariants	Document in nearest ancestor
Cross-cutting concern	Place at lowest common ancestor

Do NOT create for:

• Every directory
• Simple utilities or config-only directories
• Test folders (unless complex test infrastructure)
• Directories with <5 source files AND <2k tokens (too little to document meaningfully — a 54-line node for 4 markdown files is filler)

---

Pre-flight Checks

TL;DR: Testable verifications before risky operations. Add when mistakes reveal missing checks.

What They Are

Pre-flight checks are verifiable assertions an agent runs before modifying code. They catch "I thought I understood" mistakes.

When to Add

Signal	Action
Mistake happened	Write check that would have caught it
PR reviewer flagged missing step	Convert to check
Complex multi-step operation	Add checks for each step
Critical/irreversible operation	Add comprehension + human gate

When NOT to Add

• Every operation (over-checking slows agents down)
• Things covered by Boundaries section (use Always/Never instead)
• Awareness-only items (use Pitfalls instead)

Format

See references/templates.md → Writing Pre-flight Checks for the standard format.

Mining Checks from History

# Find commits suggesting missing verifications
scripts/mine_git_history.sh --since "6 months ago" [directory] | grep -E "fix|broke|forgot"

Look for patterns like "forgot to update X" or "broke Y because didn't check Z".

---

Capture Order (Leaf-First)

TL;DR: Start at leaves, work up to root. Clarity compounds upward.

Always capture leaf-first, easy-to-hard:

1. Start with deepest directories (most concrete)

   • Leaf nodes compress raw code—patterns are visible
   • Easier to identify contracts when you see the implementation

2. Work up to parent nodes (summarize children)

   • Parent nodes compress children's Intent Nodes, not raw code
   • Wait until children are stable before writing parent

3. Finish with root (summarize entire hierarchy)

   • Root references child nodes, provides navigation
   • Global invariants emerge from seeing all children

Why this order?

• Clarity compounds upward—parent nodes reference stable children
• Avoids rewriting parents when children change
• Natural: understand details before summarizing

Anti-pattern: Starting at root and working down leads to vague descriptions that need constant revision as you discover what's actually in the code.

---

Feedback Flywheel

TL;DR: Agents surface missing context during work → humans review → Intent Layer improves → future agents start better.

Continuous Improvement Loop

Agent works → Finds gap → Surfaces finding → Human reviews → Node updated → Future agents benefit

During Normal Work

When you encounter gaps while working, surface them using the format in references/agent-feedback-protocol.md:

### Intent Layer Feedback
| Type | Location | Finding |
|------|----------|---------|
| Missing pitfall | `src/api/AGENTS.md` | Rate limiter fails silently when Redis down |

On Merge/PR

Run change detection to identify which nodes need review:

scripts/detect_changes.sh main HEAD

This outputs affected nodes in leaf-first order for systematic review.

Full Protocol

See references/agent-feedback-protocol.md for:

• When to surface findings
• Structured feedback format
• Human review workflow (Accept/Reject/Defer)

Mistake → Check Pipeline

When agents surface mistakes, evaluate for check conversion:

Mistake surfaced → "Would a check have caught this?"
                            │
              ┌─────────────┴─────────────┐
              │                           │
             Yes                          No
              │                           │
              ▼                           ▼
    Write Pre-flight Check         Add to Pitfalls
              │                    (awareness only)
              ▼
    Add to AGENTS.md Pre-flight section

Check conversion template:

Mistake: [What happened]
Operation: [What agent was doing]
Check: Before [operation] → [verification that would have caught it]

Use scripts/capture_mistake.sh to generate structured mistake reports.

---

Maintenance Flywheel

TL;DR: Update nodes when behavior changes, not just when code changes.

When files change (e.g., on merge):

1. Identify affected nodes - Run scripts/detect_changes.sh base head
2. Check behavior change - Did contracts/invariants change, or just formatting?
3. Update if needed - Behavior change → update affected node
4. Consider new nodes - Patterns emerging → new node or LCA update?

For full maintenance workflow, use: intent-layer-maintenance skill

---

What's Next?

After completing initial setup (state = complete):

Immediate Actions

1. Create symlink for cross-tool compatibility
2. Test by asking an AI agent to perform a common task
3. Share with team (note in README or onboarding docs)

Ongoing Maintenance

Trigger	Action
Quarterly	Run intent-layer-maintenance skill
Post-incident	Update Pitfalls + Contracts
After refactor	Update Entry Points + Subsystem Boundaries
After new feature	Update Architecture Decisions + Patterns
PR Review	Auto-invoke pr-review sub-skill

PR Review Integration (Auto-Invoked)

When reviewing PRs that touch files covered by Intent Layer nodes:

# Automatically run pr-review
scripts/review_pr.sh main HEAD --ai-generated

The pr-review sub-skill will:

• Check PR against contracts in relevant AGENTS.md
• Flag if PR approaches documented pitfalls
• Suggest Intent Layer updates if contracts changed

Optional: CI Integration

- name: Check Intent Layer
  run: ${CLAUDE_PLUGIN_ROOT}/scripts/detect_state.sh .

- name: PR Review (if Intent Layer exists)
  if: github.event_name == 'pull_request'
  run: |
    ${CLAUDE_PLUGIN_ROOT}/scripts/review_pr.sh origin/main HEAD --exit-code

Related Skills

Skill	Use When
intent-layer-maintenance	Quarterly audits, post-incident updates
intent-layer-query	Asking questions about the codebase
intent-layer-onboarding	Orienting newcomers
git-history (sub-skill)	Mining commit history for insights
pr-review-mining (sub-skill)	Mining PR discussions for insights
pr-review (sub-skill)	Reviewing PRs against Intent Layer