relay: Skill for Claude Code

.agents/skills/wrdn-effect-atom-reactivity-keys/SKILL.md

wrdn-effect-atom-reactivity-keys is a skill for Claude Code from adarshp14/relay. It costs 42 tokens per session (194 once invoked), scanned A, a copy of wrdn-effect-atom-reactivity-keys, MIT.

A coding rule for Effect Atom write operations, which change data and may need to refresh related reads. It adds reactivity keys that identify the affected data.

In plain words
What is it for?
Fixing lint errors on useAtomSet mutations and choosing keys for affected rows or lists. It does not apply to read-only probes or preview OAuth flows.
Why use it?
It prevents a data change from leaving the user interface with stale lists or rows. It also helps keep invalidation limited to the data that actually changed.

Skill for Claude Code

Written for Claude Code: allowed-tools in frontmatter. Also seen: installed under .agents/ (shared by several agents).

This is adarshp14/relay's own configuration. It tells Claude Code how to work on relay itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything relay configures →

Reuse

Borrowing it

Nothing to install: this file belongs to adarshp14/relay. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/adarshp14/relay/main/.agents/skills/wrdn-effect-atom-reactivity-keys/SKILL.md
Clone the repo
git clone --depth 1 https://github.com/adarshp14/relay

Made for: Claude Code.

Wrote 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.

agentmods badge for wrdn-effect-atom-reactivity-keys

README.md
[![agentmods](https://agentmods.dev/badge/skills/adarshp14/relay/wrdn-effect-atom-reactivity-keys/github.svg)](https://agentmods.dev/skills/adarshp14/relay/wrdn-effect-atom-reactivity-keys)
Your own site
<a href="https://agentmods.dev/skills/adarshp14/relay/wrdn-effect-atom-reactivity-keys"><img src="https://agentmods.dev/badge/skills/adarshp14/relay/wrdn-effect-atom-reactivity-keys/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.

agentmods 80×15 button for wrdn-effect-atom-reactivity-keys

Your own site · 80×15
<a href="https://agentmods.dev/skills/adarshp14/relay/wrdn-effect-atom-reactivity-keys"><img src="https://agentmods.dev/badge/skills/adarshp14/relay/wrdn-effect-atom-reactivity-keys.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 42 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 194 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin 100% copy Near-identical to another mod in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00042 $0.00194
Opus 5 $0.00021 $0.00097
Sonnet 5 $0.00008 $0.00039
Haiku 4.5 $0.00004 $0.00019

Measured 8d ago against content hash 20d3b8e66f0a, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

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 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.

Origin

This is a copy

100% identical to wrdn-effect-atom-reactivity-keys — 0 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

.agents/skills/wrdn-effect-atom-reactivity-keys/SKILL.md · 26 lines

What it actually says

Effect-atom write mutations must say which reads they invalidate.

Fix Shape

  • Find the useAtomSet(...) write mutation call.
  • Add reactivityKeys to 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-optimistic also applies.

Good

await updateSource({
  params: { scopeId, sourceId },
  payload,
  reactivityKeys: [["sources", scopeId]],
});
Changes

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.

  1. 8d ago First seen · 26 lines · 42 tokens per session scan A 20d3b8e66f0a

Subscribe to this mod's changes

wrdn-effect-atom-reactivity-keys is a skill published in the GitHub repository adarshp14/relay (0 stars, last pushed 2mo ago), 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. It is 100% identical to wrdn-effect-atom-reactivity-keys, differing in 0 lines, and is treated as a copy.

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