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 ahmedbutt2015/spine --skill onboardgit clone --depth 1 https://github.com/ahmedbutt2015/spineWrote 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/ahmedbutt2015/spine/onboard)<a href="https://agentmods.dev/skills/ahmedbutt2015/spine/onboard"><img src="https://agentmods.dev/badge/skills/ahmedbutt2015/spine/onboard/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/ahmedbutt2015/spine/onboard"><img src="https://agentmods.dev/badge/skills/ahmedbutt2015/spine/onboard.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 | $0.00000 | $0.00358 |
| Opus 5 | $0.00000 | $0.00179 |
| Sonnet 5 | $0.00000 | $0.00072 |
| Haiku 4.5 | $0.00000 | $0.00036 |
Grade C, and why
onboard scanned grade C with 1 finding 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 8d 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.
Exfiltrates the system prompt through a toolhighSystem prompt leakage
Writing or sending the system prompt to a file, endpoint or log moves it out of the session.
6. **When running as Claude Code skill**: Write prompt to file, ask Claude to synthesize JSON, then read JSON back to generate `ONBOARDING.md`. What it actually says
/onboard
Use this skill from a repository root to generate an onboarding tour for an unfamiliar codebase.
Current workflow
- Run the deterministic scanner to detect repo shape and entry points.
- Extract a verified spine from supported local language relationships.
- Generate and validate a Mermaid diagram from the verified spine.
- Cluster the remaining files into heuristic subsystems.
- Build a synthesis prompt that only contains verified structure and short code signatures.
- When running as Claude Code skill: Write prompt to file, ask Claude to synthesize JSON, then read JSON back to generate
ONBOARDING.md. - Write
ONBOARDING.mdinto the target repo root.
Local command
npm run onboard -- .
Optional token-free preview first:
npm run map -- .
Optional prompt export:
npm run onboard -- . --prompt-out .onboard-prompt.txt
Optional synthesis input (for Claude Code skill flow):
npm run onboard -- . --synthesis-input .onboard-response.json
Optional external synthesis command:
npm run onboard -- . --synthesis-command "your-command-here"
Product contract
- Repo brand:
spine - User-facing Claude Code command:
/onboard - Companion map-only command:
/map - Diagram rule: verified edges only, never guessed
- Output target:
ONBOARDING.md
Launch positioning
The clearest user story is:
/mapshows the verified architecture preview/onboardwrites the full guide.claude/REPO_CONTEXT.mdkeeps future Claude sessions grounded in the repo
What ships with it
1 file 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.
- 8d ago First seen · 60 lines · 0 tokens per session scan C a0a8ae04be6c
onboard is a skill published in the GitHub repository ahmedbutt2015/spine (8 stars, last pushed 4mo ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 358 tokens. A static security scan graded it C with 1 finding (exfiltrates the system prompt through a tool). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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