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 maksutovic/joycraft --skill joycraft-verifygit clone --depth 1 https://github.com/maksutovic/joycraftWrote 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/maksutovic/joycraft/joycraft-verify)<a href="https://agentmods.dev/skills/maksutovic/joycraft/joycraft-verify"><img src="https://agentmods.dev/badge/skills/maksutovic/joycraft/joycraft-verify.svg" alt="Measured on agentmods" 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 | $0.00031 | $0.02188 |
| Opus 5 | $0.00015 | $0.01094 |
| Sonnet 5 | $0.00006 | $0.00438 |
| Haiku 4.5 | $0.00003 | $0.00219 |
Grade A, and why
joycraft-verify 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 today.
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 — 177 lines — stays where its author put it; the contents beside it link to each section on GitHub.
At skill entry, run node docs/.joycraft/check.mjs check --json --session <session-id> once, reusing JOYCRAFT_SESSION_ID if supplied or one ID chosen for this conversation. If the checker is missing or fails, continue the requested skill quietly without retrying setup. Offer updates only for display: true; current, postponed, off, and unknown stay quiet. If automaticUpdate is present, finish this skill, then run its exact command once from the project root: the candidate must verify every safety gate before applying. Other updates require approval. After an offer or automatic attempt, record it with node docs/.joycraft/check.mjs acknowledge <available-version> --session <session-id>. Apply updates only at this workflow boundary; after success, reinvoke the skill or restart the session to load changed instructions.
Verify Implementation Against Spec
The user wants independent verification of an implementation. Your job is to find the relevant spec, extract its acceptance criteria and test plan, then spawn a separate verifier subagent that checks each criterion and produces a structured verdict.
Why a separate subagent? Research found that agents reliably skew positive when grading their own work. Separating the agent doing the work from the agent judging it consistently outperforms self-evaluation. The verifier gets a clean context window with no implementation bias.
Step 1: Find the Spec
If the user provided a spec path (e.g., $joycraft-verify docs/features/<slug>/specs/add-widget.md), use that path directly.
If no path was provided, scan docs/features/*/specs/ recursively for spec files (and docs/bugfixes/<area>/ for bugfixes). Pick the most recently modified .md file. If no specs exist, tell the user:
No specs found under
docs/features/*/specs/ordocs/bugfixes/. Please provide a spec path:$joycraft-verify path/to/spec.md
Step 2: Read and Parse the Spec
Read the spec file and extract:
- Spec name -- from the H1 title
- Acceptance Criteria -- the checklist under the
## Acceptance Criteriasection - Test Plan -- the table under the
## Test Plansection, including any test commands - Constraints -- the
## Constraintssection if present
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.
- today Changed · +2 lines 3dd8dbf14314
- 8d ago First seen · 175 lines · 31 tokens per session scan A 800a2891c66e
joycraft-verify is a skill published in the GitHub repository maksutovic/joycraft (15 stars, last pushed today), licensed MIT. It adds 31 tokens to every session and 2,188 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 2026-08-30.
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