multi-agent-collaboration-system: Skill for Claude Code

.agents/skills/onboard/SKILL.md

onboard is a skill for Claude Code, Codex from lxyer/multi-agent-collaboration-system. It costs 76 tokens per session (3,368 once invoked), scanned A, original, MIT.

An interactive introduction to the Trellis system, an AI-assisted development workflow for keeping project knowledge and coding rules organised. It explains the system's ideas, structure, skills, commands, examples, and customisation.

In plain words
What is it for?
Use it when a developer joins the project or needs to learn how Trellis skills, commands, workflow examples, and development guidelines fit together.
Why use it?
It gives a new team member the background needed to use the workflow correctly instead of following unexplained steps. It also helps identify and fill in project-specific guidelines.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one. Also seen: installed under .agents/ (shared by several agents); $skill-name invocation.

This is lxyer/multi-agent-collaboration-system's own configuration. It tells Claude Code and Codex how to work on multi-agent-collaboration-system itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything multi-agent-collaboration-system configures →

Needs its repository: it runs a file that does not travel with it, so clone the repository first. The line is python3 ./.trellis/scripts/task.py create "Fill spec guidelines" --slug fill-spec-guidelines.

Reuse

Borrowing it

Nothing to install: this file belongs to lxyer/multi-agent-collaboration-system. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/lxyer/multi-agent-collaboration-system/main/.agents/skills/onboard/SKILL.md
Clone the repo
git clone --depth 1 https://github.com/lxyer/multi-agent-collaboration-system

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for onboard

README.md
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Your own site
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Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for onboard

Your own site · 80×15
<a href="https://agentmods.dev/skills/lxyer/multi-agent-collaboration-system/onboard"><img src="https://agentmods.dev/badge/skills/lxyer/multi-agent-collaboration-system/onboard.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 76 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 3,368 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00076 $0.03368
Opus 5 $0.00038 $0.01684
Sonnet 5 $0.00015 $0.00674
Haiku 4.5 $0.00008 $0.00337

Measured 9d ago against content hash ec6db142f763, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade A, and why

onboard scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 9d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

.agents/skills/onboard/SKILL.md · 364 lines

How it starts

The opening of the file, as written. The whole thing — 364 lines — stays where its author put it; the contents beside it link to each section on GitHub.

You are a senior developer onboarding a new team member to this project's AI-assisted workflow system.

YOUR ROLE: Be a mentor and teacher. Don't just list steps - EXPLAIN the underlying principles, why each skill exists, what problem it solves at a fundamental level.

CRITICAL INSTRUCTION - YOU MUST COMPLETE ALL SECTIONS

This onboarding has THREE equally important parts:

PART 1: Core Concepts (Sections: CORE PHILOSOPHY, SYSTEM STRUCTURE, SKILL DEEP DIVE)

  • Explain WHY this workflow exists
  • Explain WHAT each skill does and WHY

PART 2: Real-World Examples (Section: REAL-WORLD WORKFLOW EXAMPLES)

  • Walk through ALL 5 examples in detail
  • For EACH step in EACH example, explain:
    • PRINCIPLE: Why this step exists
    • WHAT HAPPENS: What the skill actually does
    • IF SKIPPED: What goes wrong without it

PART 3: Customize Your Development Guidelines (Section: CUSTOMIZE YOUR DEVELOPMENT GUIDELINES)

  • Check if project guidelines are still empty templates
  • If empty, guide the developer to fill them with project-specific content
  • Explain the customization workflow

DO NOT skip any part. All three parts are essential:

  • Part 1 teaches the concepts
  • Part 2 shows how concepts work in practice
  • Part 3 ensures the project has proper guidelines for AI to follow

After completing ALL THREE parts, ask the developer about their first task.


CORE PHILOSOPHY: Why This Workflow Exists

AI-assisted development has three fundamental challenges:

Challenge 1: AI Has No Memory

Every AI session starts with a blank slate. Unlike human engineers who accumulate project knowledge over weeks/months, AI forgets everything when a session ends.

The Problem: Without memory, AI asks the same questions repeatedly, makes the same mistakes, and can't build on previous work.

The Solution: The .trellis/workspace/ system captures what happened in each session - what was done, what was learned, what problems were solved. The $start skill reads this history at session start, giving AI "artificial memory."

Read the full file on GitHub · 364 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 9d ago First seen · 364 lines · 76 tokens per session scan A ec6db142f763

Subscribe to this mod's changes

onboard is a skill published in the GitHub repository lxyer/multi-agent-collaboration-system (1 stars, last pushed 4mo ago), licensed MIT. It adds 76 tokens to every session and 3,368 once invoked, about $0.0004 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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