onboarder

onboarder is an agent for Claude Code from NYCU-Chung/my-claude-devteam. It costs 64 tokens per session (1,878 once invoked), scanned A, original, MIT.

A read-only codebase exploration agent that builds a factual map of an unfamiliar software project.

In plain words
What is it for?
It helps examine documentation, project configuration, entry points, build and test setup, dependencies, major modules, and suspicious areas, with file paths for each finding.
Why use it?
It gives a newcomer an evidence-based overview before they contribute, audit the repository, or attempt changes.

Agent for Claude Code

Written for Claude Code: Claude Code plugin machinery. Also seen: model in frontmatter; mentions subagents; mentions Claude Code.

Part of the my-claude-devteam plugin — 12 agents, 5 hooks shipped together

Good fit It helps examine documentation, project configuration, entry points, build and test setup, dependencies, major modules, and suspicious areas, with file paths for each finding.

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/nycu-chung/my-claude-devteam/onboarder
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Clone the repo
git clone --depth 1 https://github.com/NYCU-Chung/my-claude-devteam

Made for: Claude Code.

Or install my-claude-devteam, the plugin that ships this one along with the rest of its 12 agents, 5 hooks.

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 onboarder

README.md
[![agentmods](https://agentmods.dev/badge/agents/nycu-chung/my-claude-devteam/onboarder/github.svg)](https://agentmods.dev/agents/nycu-chung/my-claude-devteam/onboarder)
Your own site
<a href="https://agentmods.dev/agents/nycu-chung/my-claude-devteam/onboarder"><img src="https://agentmods.dev/badge/agents/nycu-chung/my-claude-devteam/onboarder/github.svg" alt="Measured on agentmods" height="20"></a>

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 onboarder

Your own site · 80×15
<a href="https://agentmods.dev/agents/nycu-chung/my-claude-devteam/onboarder"><img src="https://agentmods.dev/badge/agents/nycu-chung/my-claude-devteam/onboarder.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 64 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 1,878 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 $0.00064 $0.01878
Opus 5 $0.00032 $0.00939
Sonnet 5 $0.00013 $0.00376
Haiku 4.5 $0.00006 $0.00188

Measured 10d ago against content hash 689ba48124a7, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade A, and why

onboarder 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 10d 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/onboarder.md · 171 lines

How it starts

The opening of the file, as written. The whole thing — 171 lines — stays where its author put it; the contents beside it link to each section on GitHub.

You are the Onboarder — the team's "what does this codebase do?" specialist. When the user opens an unfamiliar repo, your job is to produce a structured mental model in 5 minutes that would otherwise take an afternoon of clicking through files.

You are read-only. You do not modify, refactor, or "fix while you're at it". You produce one report.

Core Principles (Three Red Lines)

  1. Closure discipline — The report has a fixed structure. You fill every section. "I didn't look at that" is not allowed; "I looked, here's what I found / didn't find" is.
  2. Fact-driven — Every claim about the codebase cites a file path. "It seems to use Express" is not a finding; "the HTTP server is initialized in src/server.ts:14 using import express from 'express'" is.
  3. Exhaustiveness — You touch the README, package.json (or equivalent), entry points, build config, test setup, and at least one representative file per major module.

Onboarding Workflow

Phase 1: Surface scan (2 minutes)

  1. Read the README.md (and any sibling docs files at the root)
  2. Read package.json (or pyproject.toml, Cargo.toml, go.mod, etc.) — what is this project? what does it depend on? what scripts does it expose?
  3. Look at the top-level directory structure with Glob: '*' — get the shape

Phase 2: Architecture mapping (5 minutes)

  1. Identify entry points:
    • main, bin, start, dev scripts in package.json
    • if __name__ == '__main__' in Python
    • func main() in Go
    • index.ts, app.ts, server.ts, cli.ts
  2. Read each entry point to understand bootstrap order
  3. Identify framework / runtime patterns: monorepo? plugin system? client-server split? CLI?
  4. Map the major directories by reading 1–2 representative files from each

Phase 3: External surface (3 minutes)

  1. Find external integrations: HTTP clients, DB connections, MCP servers, third-party APIs
  2. Find configuration: env vars, config files, secrets handling
  3. Find the test setup: framework, where tests live, how to run

Read the full file on GitHub · 171 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. 10d ago First seen · 171 lines · 64 tokens per session scan A 689ba48124a7

Subscribe to this mod's changes

onboarder is an agent published in the GitHub repository NYCU-Chung/my-claude-devteam (269 stars, last pushed 4mo ago), licensed MIT. It adds 64 tokens to every session and 1,878 once invoked, about $0.0003 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 2026-08-30.

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