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 majiayu000/spellbook --skill vibeguardgit clone --depth 1 https://github.com/majiayu000/spellbookWrote 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/majiayu000/spellbook/vibeguard)<a href="https://agentmods.dev/skills/majiayu000/spellbook/vibeguard"><img src="https://agentmods.dev/badge/skills/majiayu000/spellbook/vibeguard/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/majiayu000/spellbook/vibeguard"><img src="https://agentmods.dev/badge/skills/majiayu000/spellbook/vibeguard.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00045 | $0.00625 |
| Opus 5 | $0.00023 | $0.00313 |
| Sonnet 5 | $0.00009 | $0.00125 |
| Haiku 4.5 | $0.00005 | $0.00063 |
Grade A, and why
vibeguard 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 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.
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 — 99 lines — stays where its author put it; the contents beside it link to each section on GitHub.
VibeGuard
Lightweight VibeGuard for everyday use inside Spellbook.
This skill helps with three moments where AI-assisted work usually drifts:
- before implementation starts
- while review findings are being prioritized
- after regressions or avoidable mistakes happen
What This Skill Includes
- A task contract checklist for scoping work before coding
- A scoring matrix for prioritizing findings with evidence
- A weekly review template for regression and guardrail retrospectives
Hard Boundaries
This skill is intentionally lightweight.
It does:
- guide task kickoff
- structure review output
- make risk tradeoffs explicit
It does not:
- install hooks
- run guard scripts automatically
- patch global Claude or Codex configuration
- claim that full VibeGuard enforcement is active
If the user asks for automated interception, repo-level rules, or environment setup, escalate to the full VibeGuard repository and tooling.
When To Use It
Trigger this skill when the user asks for:
- anti-hallucination guardrails
- task startup checks
- review scoring or triage
- regression prevention
- retrospective templates
- "vibeguard" by name
Workflow
1. Start With The Task Contract
Open references/task-contract.yaml and confirm:
- goal
- source of truth
- acceptance criteria
- scope
Do not move into implementation until these are concrete.
2. Score Findings Before Acting
Open references/scoring-matrix.md and score each finding on:
- impact
- effort
- risk
- confidence
Use the score to separate urgent fixes from weak guesses.
3. Pick The Right Delivery Mode
- 1-2 files: implement directly once the contract is clear
- 3-5 files: write a short spec or step plan first
- 6+ files: produce a full design/spec and staged execution plan
4. Review The Failure, Not Just The Symptom
If something regressed, identify which defense failed:
- scope control
- source-of-truth validation
- verification depth
- review prioritization
- missing guardrail
What ships with it
3 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.
- 8d ago First seen · 99 lines · 45 tokens per session scan A 0848223318e3
vibeguard is a skill published in the GitHub repository majiayu000/spellbook (278 stars, last pushed yesterday), licensed MIT. It adds 45 tokens to every session and 625 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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