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cratis-arc-command-typescript

cratis-arc-command-typescript is a skill for Claude Code, Codex from Cratis/AI. It costs 161 tokens per session (3,781 once invoked), scanned A, original, MIT.

A guide for defining commands in a Node.js TypeScript server with Cratis Arc. A command represents an operation with inputs; Arc supplies the route, input binding, validation, authorization, and result format.

In plain words
What is it for?
Use it to create commands, handle their inputs, inject services, apply authorization, and return events or other outcomes.
Why use it?
It removes the need to write a separate controller and route for each command. It also clarifies the difference between Arc's server preview packages and its published client package.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

Needs its repository: it reads a path above its own folder, which exists only inside the repository. The line is import { TaskId } from '../TaskId.js';.

not rated 4repo changed 7d ago A scan 161 tokens original MIT

Good fit Use it to create commands, handle their inputs, inject services, apply authorization, and return events or other outcomes.

Compare 6 skills from other repositories ↓
View source ↗ Cratis/AI cratis.io
Install

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.

Clone the repo
git clone --depth 1 https://github.com/Cratis/AI
agentmods
npx agentmods add skills/cratis/ai/cratis-arc-command-typescript

Made for: Claude Code, Codex.

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 cratis-arc-command-typescript

README.md
[![agentmods](https://agentmods.dev/badge/skills/cratis/ai/cratis-arc-command-typescript/github.svg)](https://agentmods.dev/skills/cratis/ai/cratis-arc-command-typescript)
Your own site
<a href="https://agentmods.dev/skills/cratis/ai/cratis-arc-command-typescript"><img src="https://agentmods.dev/badge/skills/cratis/ai/cratis-arc-command-typescript/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.

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Your own site · 80×15
<a href="https://agentmods.dev/skills/cratis/ai/cratis-arc-command-typescript"><img src="https://agentmods.dev/badge/skills/cratis/ai/cratis-arc-command-typescript.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 161 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 3,781 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 $0.00161 $0.03781
Opus 5.5 $0.00064 $0.01512
Sonnet 5.5 $0.00032 $0.00756
Haiku 4.5 $0.00016 $0.00378

Measured 7d ago against content hash 89b046331283, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

cratis-arc-command-typescript 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 7d 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.

.cratis/ai/skills/cratis-arc-command-typescript/SKILL.md · 330 lines

How it starts

The opening of the file, as written. The whole thing — 330 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Define an Arc command in TypeScript (Node.js server)

Arc for TypeScript (Cratis/Arc.TypeScript) is the Node.js server implementation of Arc. A command is a decorated class that carries the input and handles itself; Arc supplies the route, body binding, validation, authorization, and the CommandResult envelope. There is no controller and no route to write.

Source preview — read this first

  • None of the server packages is published to npm. @cratis/arc.core, @cratis/arc.express, @cratis/arc.fastify, @cratis/arc.hono, @cratis/arc.testing, @cratis/arc.mongodb, @cratis/arc.drizzle, @cratis/arc.chronicle, @cratis/cratis, @cratis/arc.proxygenerator and @cratis/eslint-plugin-arc-core are an unpublished source preview (0.x manifests, GitHub pre-releases). The API may still change. npm install @cratis/arc.core fails.
  • @cratis/arc is a different package. @cratis/arc, @cratis/arc.react and @cratis/arc.react.mvvm are the published client runtime, built from Cratis/Arc. Generated proxies import them in the frontend. The server packages never depend on them. Never tell a user to install @cratis/arc to get a server.
  • @cratis/arc.chronicle and @cratis/cratis are additionally marked experimental.

Verified product sources

Source: Cratis/Arc.TypeScript (source preview), reading package exports, Documentation/**, and Samples/Tasks / Samples/Library. Behavior on the development branch is excluded.

Requires the Chronicle SDK peer ^6.29.0, Fundamentals peer ^7.19.6, @opentelemetry/api ^1.9.0 and (optional, for RxJS observable queries) rxjs ^7.8.2.

The Chronicle integration needs Node 22.19+, zod ^4.1, rxjs ^7.8.2, and an optional @cratis/arc.testing peer for scenarios.

Read references/hosting-and-storage.md when hosting or wiring storage. Read references/chronicle-events.md when returning or specifying Chronicle events.

Read the full file on GitHub · 330 lines

Files

What ships with it

12 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.

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. 7d ago Changed · -98 lines 89b046331283
  2. 9d ago Changed · +20 lines 4a2791862eff
  3. 12d ago Changed · -96 lines a46e78768874
  4. 15d ago Changed · +8 lines 2b95819b9d95
  5. 20d ago First seen · 496 lines · 161 tokens per session scan A 0d1cee2eec0c

Subscribe to this mod's changes

cratis-arc-command-typescript is a skill published in the GitHub repository Cratis/AI (4 stars, last pushed yesterday), licensed MIT. It adds 161 tokens to every session and 3,781 once invoked, about $0.0006 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 2026-10-02.

Backend and APIsLanguagesTypeScriptagent-skillsaicqrscratisdotnetevent-sourcing
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