Getting it into your agent
It runs from inside its repository, so the clone comes first — what it calls does not travel with the file alone.
git clone --depth 1 https://github.com/conorbronsdon/agent-skillsnpx agentmods add skills/conorbronsdon/agent-skills/ssot-checkWrote 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/conorbronsdon/agent-skills/ssot-check)<a href="https://agentmods.dev/skills/conorbronsdon/agent-skills/ssot-check"><img src="https://agentmods.dev/badge/skills/conorbronsdon/agent-skills/ssot-check/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/conorbronsdon/agent-skills/ssot-check"><img src="https://agentmods.dev/badge/skills/conorbronsdon/agent-skills/ssot-check.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 | $0.00072 | $0.04784 |
| Opus 5 | $0.00036 | $0.02392 |
| Sonnet 5 | $0.00014 | $0.00957 |
| Haiku 4.5 | $0.00007 | $0.00478 |
Grade A, and why
ssot-check 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 10d 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 — 227 lines — stays where its author put it; the contents beside it link to each section on GitHub.
/ssot-check — Fact-Copy Drift Auditor
Documentation-heavy repos repeat facts. An episode count lives in a README, then gets hand-copied into a media kit, a landing page, and a business plan. Someone updates the README. The copies drift. This skill finds those copies, records where the canonical value lives, and checks the copies against it on every run.
It complements /reconcile. Reconcile catches multi-session drift in state files. This skill catches fact-copy drift across documents: the same number or string living in several files, where exactly one file is allowed to be right.
Invocation: deliberately model-invocable — it belongs in pre-commit moments. No file is ever edited: fixes are proposed as diffs, never auto-applied. No repo being audited is ever modified — no pull, no rebase, no checkout, no commit, in this repo or a sibling.
Exactly one operation writes anything at all, and it is worth stating plainly rather than burying: git fetch in a sibling clone, which updates that clone's remote-tracking refs and FETCH_HEAD so a value can be compared against a live remote. It touches no working tree and no file. It is off by default and runs only on an explicit request from the user in that session. Absent that request, freshness comes from refs already on disk, or the fact is reported UNVERIFIED.
When to Use
- Discover mode: first run on a repo, or after adding a new doc surface (a media kit, a landing page, a pricing page)
- Check mode: before commits that touch docs, as a pre-commit habit, or any time a canonical number changed
- After a bulk find-and-replace, to confirm nothing was missed
- When a repo has a "grep for other files with the same number" rule that people forget to follow
When NOT to Use
What ships with it
5 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.
- 10d ago First seen · 227 lines · 72 tokens per session scan A a7eac0fad492
ssot-check is a skill published in the GitHub repository conorbronsdon/agent-skills (10 stars, last pushed 1mo ago), licensed MIT. It adds 72 tokens to every session and 4,784 once invoked, about $0.0004 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 2026-08-31.
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