Codebase Onboarding
FreeStreamline onboarding with automated documentation generation.
Free · Opens the source repo
What Codebase Onboarding does
The Codebase Onboarding skill is designed to assist teams in creating comprehensive onboarding documentation for new engineers, tech leads, and contractors. By analyzing a codebase, it gathers essential facts and generates repeatable outputs that can be tailored to different audiences. This ensures that new contributors have access to the information they need to get up to speed quickly and effectively.
At its core, the skill performs architecture and stack discovery, inventories key files and configurations, and generates guidance on local setup and common tasks. It focuses on audience-aware documentation, allowing teams to provide the right level of detail depending on the experience of the user. For example, junior developers may receive setup instructions and guardrails, while senior engineers might need more in-depth architectural insights.
The workflow is straightforward: users run a Python script against their target repository to collect vital signals such as file counts and detected languages. This information is then used to fill out a structured onboarding template, ensuring consistency and clarity in documentation. The skill also emphasizes best practices, such as validating setup commands and keeping documentation up-to-date with changes in the codebase.
This skill is particularly beneficial for teams looking to standardize their onboarding process, rebuild documentation after significant changes, or prepare internal handoff materials. By leveraging automated fact-gathering, it reduces the time and effort required to create high-quality onboarding documents, ultimately enhancing the developer experience and productivity.
When to use it
Use this skill when onboarding new team members, especially in complex codebases, or when updating documentation after significant changes.
When not to use it
This skill may not be suitable for projects with minimal documentation needs or for teams that prefer a highly customized onboarding process without automation.
What you can build with it
Onboarding New Engineers
Use this skill to quickly generate onboarding documentation for new hires, ensuring they have the necessary resources to start contributing.
Updating Stale Documentation
After significant changes in a project, run the skill to rebuild and refresh documentation, keeping it relevant and useful.
Preparing Handoff Materials
Create structured handoff documentation for internal transfers or contractor onboarding, ensuring clarity and consistency.
How to install Codebase Onboarding
View source1. Install with the skills CLI
npx skills add alirezarezvani/claude-skills/codebase-onboarding --agent claude-code2. Or install it manually
Download the skill folder and drop it into ~/.claude/skills/ for all projects, or .claude/skills/ to scope it to one repo. Restart Claude Code so it picks up the new skill.
Anthropic's agentic coding CLI, and the reference implementation of Agent Skills. Drop a skill folder into ~/.claude/skills and Claude Code loads it automatically whenever a task matches the skill's description. Claude Code docs
Inside SKILL.md
Written by alirezarezvaniCodebase Onboarding
Tier: POWERFUL
Category: Engineering
Domain: Documentation / Developer Experience
Overview
Analyze a codebase and generate onboarding documentation for engineers, tech leads, and contractors. This skill is optimized for fast fact-gathering and repeatable onboarding outputs.
Core Capabilities
- Architecture and stack discovery from repository signals
- Key file and config inventory for new contributors
- Local setup and common-task guidance generation
- Audience-aware documentation framing
- Debugging and contribution checklist scaffolding
When to Use
- Onboarding a new team member or contractor
- Rebuilding stale project docs after large refactors
- Preparing internal handoff documentation
- Creating a standardized onboarding packet for services
Quick Start
# 1) Gather codebase facts
python3 scripts/codebase_analyzer.py /path/to/repo
# 2) Export machine-readable output
python3 scripts/codebase_analyzer.py /path/to/repo --json
# 3) Use the template to draft onboarding docs
# See references/onboarding-template.md
Recommended Workflow
- Run
scripts/codebase_analyzer.pyagainst the target repository. - Capture key signals: file counts, detected languages, config files, top-level structure.
- Fill the onboarding template in
references/onboarding-template.md. - Tailor output depth by audience:
- Junior: setup + guardrails
- Senior: architecture + operational concerns
- Contractor: scoped ownership + integration boundaries
Onboarding Document Template
Detailed template and section examples live in:
references/onboarding-template.mdreferences/output-format-templates.md
Common Pitfalls
- Writing docs without validating setup commands on a clean environment
- Mixing architecture deep-dives into contractor-oriented docs
- Omitting troubleshooting and verification steps
- Letting onboarding docs drift from current repo state
Best Practices
- Keep setup instructions executable and time-bounded.
- Document the "why" for key architectural decisions.
- Update docs in the same PR as behavior changes.
- Treat onboarding docs as living operational assets, not one-time deliverables.
Frequently asked questions about Codebase Onboarding
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