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 agentmods add skills/hoavdc/codexkit/codexkit-repo-onboardingnpx skills add hoavdc/CodexKit --skill codexkit-repo-onboardinggit clone --depth 1 https://github.com/hoavdc/CodexKitWrote 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/hoavdc/codexkit/codexkit-repo-onboarding)<a href="https://agentmods.dev/skills/hoavdc/codexkit/codexkit-repo-onboarding"><img src="https://agentmods.dev/badge/skills/hoavdc/codexkit/codexkit-repo-onboarding.svg" alt="Measured on agentmods" 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 | $0.00031 | $0.00518 |
| Opus 5 | $0.00015 | $0.00259 |
| Sonnet 5 | $0.00006 | $0.00104 |
| Haiku 4.5 | $0.00003 | $0.00052 |
Grade A, and why
codexkit-repo-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 yesterday.
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 — 68 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Repo Onboarding
Use this skill when entering an unfamiliar repository and you need a dependable first-pass map before making changes.
Objectives
- identify the main runtime and package manager
- locate the actual app entrypoints instead of guessing
- surface tests, linting, build, and deployment hooks
- call out fragile areas, generated code, and secret-handling risk
Workflow
- Read the top-level manifest, README, and directory structure.
- Find the real execution path from entrypoint to key modules.
- Identify quality gates: lint, type-check, tests, e2e, build.
- Summarize the codebase in a compact architecture note.
- Propose the safest next step for the current task.
Deliverable
Produce a short onboarding brief with:
- stack summary
- critical directories
- commands worth running
- likely risk zones
- open questions that truly block execution
Avoid
- rewriting architecture docs before the repo is understood
- assuming the largest folder is the main app
- recommending broad refactors during onboarding
Quality Criteria
- Steps are executable in sequence without external context
- Decision points have clear if/then branching
- Rollback or abort procedures are documented for risky steps
- Expected duration or time-per-step is estimated
Verification (4C)
| Check | Question |
|---|---|
| Correctness | Do the steps execute correctly in the order specified? |
| Completeness | Are decision points, error handling, and escalation paths all documented? |
| Context-fit | Could someone with the right access but no prior context complete this runbook? |
| Consequence | If Step N fails and the operator skips to Step N+1, what breaks? |
Edge Cases
- Steps require access the operator doesn't have — Document exact access requirements upfront. Include escalation contact for emergency access.
- Environment differs from documented state — Add a pre-flight check as Step 0 to verify prerequisites before starting.
- Runbook is triggered during off-hours — Document who to contact and which steps can be safely deferred to business hours.
What ships with it
4 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- yesterday First seen · 68 lines · 31 tokens per session scan A 5fca05833691
codexkit-repo-onboarding is a skill published in the GitHub repository hoavdc/CodexKit (21 stars, last pushed 3mo ago), licensed MIT. It adds 31 tokens to every session and 518 once invoked, about $0.0002 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 2026-09-03.
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