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.
npx skills add kumaran-is/claude-code-onboarding --skill codebase-onboardinggit clone --depth 1 https://github.com/kumaran-is/claude-code-onboardingWrote 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.
[](https://agentmods.dev/skills/kumaran-is/claude-code-onboarding/codebase-onboarding)<a href="https://agentmods.dev/skills/kumaran-is/claude-code-onboarding/codebase-onboarding"><img src="https://agentmods.dev/badge/skills/kumaran-is/claude-code-onboarding/codebase-onboarding/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.
<a href="https://agentmods.dev/skills/kumaran-is/claude-code-onboarding/codebase-onboarding"><img src="https://agentmods.dev/badge/skills/kumaran-is/claude-code-onboarding/codebase-onboarding.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00061 | $0.02180 |
| Opus 5.5 | $0.00024 | $0.00872 |
| Sonnet 5.5 | $0.00012 | $0.00436 |
| Haiku 4.5 | $0.00006 | $0.00218 |
Grade A, and why
codebase-onboarding 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 2mo 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.
How it starts
The opening of the file, as written. The whole thing — 229 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Iron Law: Read actual files before making any claims about the codebase. Never infer stack from directory names alone — read the config files. A wrong CLAUDE.md is worse than no CLAUDE.md.
Codebase Onboarding Skill
Systematically maps an unfamiliar codebase in 4 phases, then generates two artifacts: a structured Onboarding Guide and a tailored CLAUDE.md.
When to Use
- Opening a new client project with Claude Code for the first time
- Joining a new team repository
- User asks "onboard me", "analyze this codebase", "generate a CLAUDE.md"
- Updating an existing CLAUDE.md to reflect current project state
Four-Phase Analysis Workflow
Phase 1: Reconnaissance (read config files, not source)
Gather signals without reading all source files. Run these in sequence:
# 1. Package manifest detection
ls pom.xml package.json pyproject.toml pubspec.yaml angular.json go.mod Cargo.toml Gemfile 2>/dev/null
# 2. Framework fingerprinting — read the detected manifests
cat pom.xml 2>/dev/null | grep -E "<artifactId>spring-boot|webflux|r2dbc" | head -5
cat package.json 2>/dev/null | grep -E "@nestjs/core|@angular/core|fastify|prisma" | head -5
cat pyproject.toml 2>/dev/null | grep -E "fastapi|langchain|langgraph" | head -5
cat pubspec.yaml 2>/dev/null | grep -E "^name:|flutter:|riverpod|go_router" | head -5
# 3. Entry point identification
ls src/main/java 2>/dev/null || ls src/app 2>/dev/null || ls lib/main.dart 2>/dev/null || ls main.py 2>/dev/null
# 4. Directory snapshot (top 2 levels, ignore noise)
find . -maxdepth 2 -type d \
! -path "*/node_modules/*" ! -path "*/.git/*" ! -path "*/build/*" \
! -path "*/dist/*" ! -path "*/.dart_tool/*" ! -path "*/target/*" \
! -path "*/__pycache__/*" ! -path "*/.gradle/*" 2>/dev/null | sort
# 5. CI/CD and tooling detection
ls .github/workflows/ Dockerfile docker-compose*.yml .env.example 2>/dev/null
Stack fingerprint → skill mapping:
| Detected | Stack | Load Skill |
|---|---|---|
pom.xml + spring-boot |
Java 21 / Spring Boot 3.5.x WebFlux | java-spring-api |
package.json + @nestjs/core |
NestJS 11.x / Fastify / Prisma | nestjs-api |
pyproject.toml + fastapi |
Python 3.14 / FastAPI 0.135.2 | python-dev |
pyproject.toml + langchain/langgraph |
Agentic AI / LangGraph | agentic-ai-dev |
angular.json |
Angular 21.x / daisyUI | angular-spa |
pubspec.yaml + flutter: |
Flutter 3.41.x / Dart 3.10.9 | flutter-mobile |
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.
- 2mo ago First seen · 229 lines · 61 tokens per session scan A ed9ce5056398
codebase-onboarding is a skill published in the GitHub repository kumaran-is/claude-code-onboarding (36 stars, last pushed 4mo ago), licensed MIT. It adds 61 tokens to every session and 2,180 once invoked, about $0.0002 per session on Opus 5.5. 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 2026-09-03.
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