execute-one

execute-one is a skill for Claude Code from a554b554/Reactant. It costs 45 tokens per session (1,824 once invoked), scanned A, original, MIT.

A document router that reads Reactant annotations and runs only the first actionable tag it finds. Reactant is a system where special tags in a document request particular actions.

In plain words
What is it for?
Use it to process one annotated file action at a time, such as handing an exact tag to the worker meant to handle it.
Why use it?
It supports step-by-step document processing and avoids running tags that are not the next actionable instruction.

Skill for Claude Code

Written for Claude Code: shipped in a Claude Code plugin. Also seen: mentions subagents.

Part of the reactant plugin — 12 skills shipped together

Good fit Use it to process one annotated file action at a time, such as handing an exact tag to the worker meant to handle it.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/a554b554/reactant/execute-one
Install

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.

Any agent
npx skills add a554b554/Reactant --skill execute-one
Clone the repo
git clone --depth 1 https://github.com/a554b554/Reactant

Made for: Claude Code.

Or install reactant, the plugin that ships this one along with the rest of its 12 skills.

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 execute-one

README.md
[![agentmods](https://agentmods.dev/badge/skills/a554b554/reactant/execute-one/github.svg)](https://agentmods.dev/skills/a554b554/reactant/execute-one)
Your own site
<a href="https://agentmods.dev/skills/a554b554/reactant/execute-one"><img src="https://agentmods.dev/badge/skills/a554b554/reactant/execute-one/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 execute-one

Your own site · 80×15
<a href="https://agentmods.dev/skills/a554b554/reactant/execute-one"><img src="https://agentmods.dev/badge/skills/a554b554/reactant/execute-one.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 45 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,824 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 original No closer match found 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 $0.00045 $0.01824
Opus 5.5 $0.00018 $0.00730
Sonnet 5.5 $0.00009 $0.00365
Haiku 4.5 $0.00005 $0.00182

Measured 1mo ago against content hash 19478479e64e, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

execute-one 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.

skills/execute-one/SKILL.md · 174 lines

How it starts

The opening of the file, as written. The whole thing — 174 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Execute One

Execute exactly one Reactant annotation: the first actionable tag in source order. The host agent is the parser. Do not call or rely on a programmatic tag scanner, parser, AST, or dispatch classifier.

Entry and Dispatch Boundary

Reactant has three direct entry skills: execute, execute-one, and skill-generator. The first two are document routers. skill-generator is a direct project-authoring utility, has no inline tag form, and is never dispatched by a router. All remaining Reactant skills are tag-only workers. Invoke a worker only after this router has selected its exact actionable annotation from the target document. Never invoke a worker because ordinary chat, authored prose, or another skill merely resembles its capability.

Usage

/execute-one <file>

Resolve a relative file path against the current working directory.

Annotation Interpretation

Read the whole document and use its structure and meaning to interpret <@skill-name> / <@skill-name: prompt> annotations. Prompts may wrap across lines.

  • Skip <@comment: ...> and paired <@chat-model> response data.
  • Skip a chat-user turn already followed by its model response.
  • Do not execute tags that are being shown as documentation, quoted examples, or code samples. A leading backslash is an optional explicit hint, not a required escape grammar.
  • Leave ambiguous, malformed-looking, and unknown tags unchanged; report them instead of guessing.
  • execute, execute-one, and skill-generator are entry skills, not inline operations. Preserve and report an apparent annotation using any of those names; never dispatch it.

Skill Discovery

For the selected annotation, look for the matching SKILL.md in project-local .reactant/skills/, configured skill_roots in order, and then the bundled Reactant skills available in the current host/install. Project-local skills may not shadow execute, execute-one, skill-generator, chat-user, resolve, chat-model, or comment. Report ambiguous collisions and do not dispatch them.

Read the full file on GitHub · 174 lines

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. 1mo ago First seen · 174 lines · 45 tokens per session scan A 19478479e64e

Subscribe to this mod's changes

execute-one is a skill published in the GitHub repository a554b554/Reactant (54 stars, last pushed 1mo ago), licensed MIT. It adds 45 tokens to every session and 1,824 once invoked, about $0.0002 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 2026-09-10.

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