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 agentmods add skills/analyticalmonk/explain-this/fact-checking-explainersnpx skills add analyticalmonk/explain-this --skill fact-checking-explainersgit clone --depth 1 https://github.com/analyticalmonk/explain-thisWhat 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 | $0.00084 | $0.01609 |
| Opus 5 | $0.00042 | $0.00805 |
| Sonnet 5 | $0.00017 | $0.00322 |
| Haiku 4.5 | $0.00008 | $0.00161 |
Grade A, and why
fact-checking-explainers 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 2d 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 — 121 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Fact-Checking Explainers
Overview
An explainer's authority comes from being right. A reader who catches one confident, wrong claim stops trusting the rest of the piece, figures and all. This skill makes claim verification enforceable by tying every checkable claim to evidence you can point to, correcting it, or cutting it. It is not a proofreading pass and not advisory: it is the gate an explainer passes before it is delivered.
The Iron Law
NO EXPLAINER SHIPS WITH AN UNVERIFIED FACTUAL CLAIM.
Every checkable claim either traces to a source that supports it, gets corrected to match the source, or gets cut.
Apply the same resolution loop to every factual claim:
- Support it with an actual source passage you can point to.
- Correct it until it matches the source.
- Cut it when no source supports it.
Treat memory, plausibility, background knowledge, and deadline pressure as signals to run the loop, not reasons to skip it. "Verify" means checking an actual source in this session.
When to Use
Run this skill:
- At research-time, over the sources gathered for an explainer, before any drafting.
- Post-draft, over the finished article, before delivery. This is a blocking gate.
- On request, whenever asked to fact-check, verify, or audit an explainer or article.
creating-explainers and explaining-codebases both call this skill at the gates above. When they do, interactive explainer delivery waits for a PASS report.
When NOT to use: content that is not an explainer, or a pure opinion or editorial piece that makes no factual claims. (Most explainers make many factual claims. Default to running it.)
What Counts as a Checkable Claim
A checkable claim is a specific factual or empirical assertion:
- numbers, dates, measurements, percentages
- names, attributions, who-did-what, who-built-what
- direct quotes
- historical events and their order
- performance results and benchmarks
- mechanism claims: "X uses Y", "X causes Y", "X is faster than Y because Z"
What ships with it
2 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.
- 2d ago First seen · 121 lines · 84 tokens per session scan A a660efc471ba
fact-checking-explainers is a skill published in the GitHub repository analyticalmonk/explain-this (19 stars, last pushed 1mo ago), licensed MIT. It adds 84 tokens to every session and 1,609 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 2026-08-30.
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