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 UCSC-VLAA/VisualClaw --skill exec-check-schema-fidelitygit clone --depth 1 https://github.com/UCSC-VLAA/VisualClawWrote 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/ucsc-vlaa/visualclaw/exec-check-schema-fidelity)<a href="https://agentmods.dev/skills/ucsc-vlaa/visualclaw/exec-check-schema-fidelity"><img src="https://agentmods.dev/badge/skills/ucsc-vlaa/visualclaw/exec-check-schema-fidelity.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 5.1 | $0.00040 | $0.00215 |
| Opus 5 | $0.00020 | $0.00108 |
| Sonnet 5 | $0.00008 | $0.00043 |
| Haiku 4.5 | $0.00004 | $0.00021 |
Grade A, and why
exec-check-schema-fidelity 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.
What it actually says
Match the Specified Schema Exactly
- Find the schema: The task, or a referenced schema file, defines the exact structure. Read it before writing.
- Use exact key names: Do not rename, pluralize, or invent fields. Missing or extra keys fail schema checks.
- Match value formats: Honor stated formats — currency strings, date formats, enumerated statuses, units.
- Write to the exact path: Produce the file at the path the task names, and only that file.
Example: A schema listing {item, sellable_count, damaged_count} requires those exact keys — not {name, count}.
Anti-pattern: Producing a well-intentioned file with differently-named fields the checker does not recognize.
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 · 17 lines · 40 tokens per session scan A f571b0c2765f
exec-check-schema-fidelity is a skill published in the GitHub repository UCSC-VLAA/VisualClaw (55 stars, last pushed 2mo ago), licensed MIT. It adds 40 tokens to every session and 215 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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