version: "1.0.0" name: agent-boundaries description: | Run multiple AI coding agents in parallel without collisions. Use when setting up parallel-agent workflows: defines file boundaries, a written contract between agents, and conflict rules so agents stop overwriting each other's work.

Agent Boundaries — Run Many AI Agents Without Them Colliding

Run two or three AI coding agents in parallel and they start stepping on each other. One edits a file, another overwrites it, commits collide. The agents that were supposed to make you 3x faster make you slower — because now you're the traffic cop.

The fix is the same thing that fixes a human team that keeps colliding: clear boundaries, a written contract, and you stepping out of the bottleneck. This skill is the drop-in version of that.

The Problem

You open 3 terminals — backend, frontend, contracts — to work in parallel. Without structure:

• Agent A edits a shared file, Agent B overwrites it
• Two agents touch the same module, commits conflict
• You become the only one who knows what's where — every decision routes through you
• "3 agents" turns into "3 sources of chaos you manage manually"

This isn't an AI problem. It's a team structure problem — the same one Conway's Law, Domain-Driven Design, and Team Topologies describe for human teams. The concepts drop straight onto agents.

Setup: Find Your Boundaries (copy into your AI)

If your project is one big repo, have the AI map the domains before you split anything.

Drop-in prompt (Thai):

วิเคราะห์ repo นี้แล้วบอกหน่อยว่าควรแบ่งเป็นกี่ domain
- แต่ละ domain ควรเป็นเจ้าของโฟลเดอร์/ไฟล์ไหนบ้าง
- มีจุดไหนที่ logic พันกันข้าม domain (cross-cutting concern)
  ที่ควรดึงออกมาเป็นส่วนกลาง
- ตั้งชื่อสิ่งเดียวกันให้ตรงกันทุก domain (ubiquitous language)
  มีคำไหนที่เรียกไม่เหมือนกันบ้าง
คืนมาเป็น map: domain → โฟลเดอร์ที่มันเป็นเจ้าของ

Drop-in prompt (English):

Analyze this repo and tell me how to split it into bounded domains:
- Which folders/files should each domain own?
- Where is logic tangled across domains (cross-cutting concerns)
  that should be pulled into a shared layer?
- Are the same things named inconsistently (ubiquitous language)?
  List the mismatches.
Return a map: domain -> folders it owns.

The output is your boundary map. Each domain becomes one agent's territory.

Setup: Give Each Agent Its Contract

Each agent (terminal / repo) gets a CLAUDE.md that states its boundary. This is the team API — the agent reads it, so you don't have to police it every turn.

Drop-in CLAUDE.md block (per agent):

## Boundary (this agent)
-You own: <folders, e.g. /api>
-You do NOT touch: <other domains' folders>
-Shared/cross-cutting code lives in: <shared path> — propose changes, don't edit silently
-Hand off to another domain by: <interface, e.g. a typed API contract / a PR note>
 
## Ubiquitous language (same names everywhere)
-"user" = the account holder (NOT "member", NOT "account")
-<add your project's canonical terms>

The Three Moves (what the boundaries actually buy you)

1. One agent = one domain. Bounded context. They can't overwrite each other because they don't work in the same place.
2. The rules live in the file, not your head. CLAUDE.md is the contract. The agent reads its own boundary — you stop being the reminder.
3. You stop being the bottleneck. Agents communicate through the written interfaces (Conway's Law: your file structure becomes their communication path). You watch the whole board instead of refereeing every move — that's the platform role, not the traffic-cop role.

When to use

• Running 2+ AI agents / terminals in parallel on one project
• Agents keep overwriting each other or producing conflicting commits
• You're the only one who knows what's where, and every decision routes through you
• Splitting a monolith repo into domains before going multi-agent
• Onboarding a new agent and wanting it to stay in its lane

The concepts (drop these into your own CLAUDE.md)

• bounded context (DDD) — 1 agent owns 1 domain, no crossing
• ubiquitous language (DDD) — same name for the same thing everywhere; keep a glossary in CLAUDE.md so agents don't drift
• cross-cutting concern — logic that spans domains (auth, logging); pull it into a shared layer, don't let each agent reinvent it
• Conway's Law — your structure becomes their communication path; structure wrong = they coordinate wrong
• platform vs stream-aligned (Team Topologies) — agents do the feature work (stream); you + CLAUDE.md are the platform that lets them flow without asking you every step

Read deeper

• Team Topologies — Skelton & Pais (team shapes, flow, platform thinking)
• Domain-Driven Design — Eric Evans (bounded contexts, ubiquitous language)

Technical notes

• Tool-agnostic. Works with Claude Code, Cursor, Aider, Copilot — anything that reads a per-project instruction file.
• No new tooling. This is a structure + a contract file, not software to install. The leverage is the boundary, not a binary.
• Scales down too. Even one agent benefits from a written boundary map — it stops "helpful" edits outside the task.