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/usefulsoftwareco/executor/wrdn-effect-atom-reactivity-keysnpx skills add UsefulSoftwareCo/executor --skill wrdn-effect-atom-reactivity-keysgit clone --depth 1 https://github.com/UsefulSoftwareCo/executorWrote 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/usefulsoftwareco/executor/wrdn-effect-atom-reactivity-keys)<a href="https://agentmods.dev/skills/usefulsoftwareco/executor/wrdn-effect-atom-reactivity-keys"><img src="https://agentmods.dev/badge/skills/usefulsoftwareco/executor/wrdn-effect-atom-reactivity-keys.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 | $0.00042 | $0.00194 |
| Opus 5 | $0.00021 | $0.00097 |
| Sonnet 5 | $0.00008 | $0.00039 |
| Haiku 4.5 | $0.00004 | $0.00019 |
Grade A, and why
wrdn-effect-atom-reactivity-keys 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 4d 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.
Copies of this mod
1 near-identical copy found in the catalogue:
- wrdn-effect-atom-reactivity-keys — 100% identical, 0 lines differ
What it actually says
Effect-atom write mutations must say which reads they invalidate.
Fix Shape
- Find the
useAtomSet(...)write mutation call. - Add
reactivityKeysto the mutation payload at the call site. - Use the narrowest keys that cover the rows/lists affected by the write.
- Keep read-only probe/preview OAuth flows out of this pattern.
- If the mutation should update UI immediately, check whether
wrdn-effect-atom-optimisticalso applies.
Good
await updateSource({
params: { scopeId, sourceId },
payload,
reactivityKeys: [["sources", scopeId]],
});
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.
- 4d ago First seen · 26 lines · 42 tokens per session scan A 20d3b8e66f0a
wrdn-effect-atom-reactivity-keys is a skill published in the GitHub repository UsefulSoftwareCo/executor (3,494 stars, last pushed yesterday), licensed MIT. It adds 42 tokens to every session and 194 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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