Borrowing it
Nothing to install: this file belongs to merlinhu1/truthmark. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/merlinhu1/truthmark/main/.agents/skills/truthmark-sync/SKILL.mdgit clone --depth 1 https://github.com/merlinhu1/truthmarkWrote 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/merlinhu1/truthmark/truthmark-sync)<a href="https://agentmods.dev/skills/merlinhu1/truthmark/truthmark-sync"><img src="https://agentmods.dev/badge/skills/merlinhu1/truthmark/truthmark-sync/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/merlinhu1/truthmark/truthmark-sync"><img src="https://agentmods.dev/badge/skills/merlinhu1/truthmark/truthmark-sync.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 | $0.00076 | $0.00337 |
| Opus 5.5 | $0.00030 | $0.00135 |
| Sonnet 5.5 | $0.00015 | $0.00067 |
| Haiku 4.5 | $0.00008 | $0.00034 |
Grade A, and why
truthmark-sync 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 1mo 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
Truthmark Sync
Use this skill automatically before finishing when functional code changed since the last successful Truth Sync. Also run it immediately when the user explicitly invokes Truth Sync.
Quick procedure:
- Skip docs-only, formatting-only, behavior-preserving renames with no truth impact, missing config, and no-code changes.
- Inspect .truthmark/config.yml and configured route files (docs/truthmark/routes/areas.md; docs/truthmark/routes/areas/) only when they exist; then inspect relevant canonical docs directly.
- Direct checkout inspection is the canonical path; do not require the truthmark binary.
- May write canonical truth docs and truth routing files only; must not rewrite functional code.
Reference files:
- Procedure: core review questions; read before edits or detailed auditing. See procedure.md.
- Report template: read before writing the final report. See report-template.md.
- Subagents and leases: read only when using subagents, leases, or accepting worker output. See subagents-and-leases.md.
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.
- 1mo ago Changed · -1 lines · +12 tokens per session 86222cd7e9b4
- 2mo ago First seen · 23 lines · 64 tokens per session scan A cc5512148f55
truthmark-sync is a skill published in the GitHub repository merlinhu1/truthmark (91 stars, last pushed 1mo ago), licensed MIT. It adds 76 tokens to every session and 337 once invoked, about $0.0003 per session on Opus 5.5. 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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