arch

arch is a skill for Claude Code from qGolem/orc. It costs 24 tokens per session (4,599 once invoked), scanned B, original, MIT.

A guided workflow for turning Rust project requirements into a tested implementation. It covers architecture, coding, review, and fuzzing, which tests programs with many generated inputs.

In plain words
What is it for?
Use it to gather requirements, design a pure Rust project, implement it, and run parallel review and fuzzing work. It does not handle frontend or browser work.
Why use it?
It gives a Rust project a fixed order of work and checkpoints for user approval. It also stops when a step fails, making problems visible before later work continues.

Skill for Claude Code

Written for Claude Code: allowed-tools in frontmatter. Also seen: model in frontmatter; reads .claude/ paths; mentions CLAUDE.md.

Part of the orc plugin — 28 skills, 27 agents shipped together

Good fit Use it to gather requirements, design a pure Rust project, implement it, and run parallel review and fuzzing work. It does not handle frontend or browser work.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/qgolem/orc/arch
View source ↗ qGolem/orc
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 qGolem/orc --skill arch
Clone the repo
git clone --depth 1 https://github.com/qGolem/orc

Made for: Claude Code.

Or install orc, the plugin that ships this one along with the rest of its 28 skills, 27 agents.

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 arch

README.md
[![agentmods](https://agentmods.dev/badge/skills/qgolem/orc/arch/github.svg)](https://agentmods.dev/skills/qgolem/orc/arch)
Your own site
<a href="https://agentmods.dev/skills/qgolem/orc/arch"><img src="https://agentmods.dev/badge/skills/qgolem/orc/arch/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 arch

Your own site · 80×15
<a href="https://agentmods.dev/skills/qgolem/orc/arch"><img src="https://agentmods.dev/badge/skills/qgolem/orc/arch.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 24 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 4,599 The whole file, excluding the scripts and references it only reads on demand.
Security scan B 1 finding. 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 $0.00024 $0.04599
Opus 5.5 $0.00010 $0.01840
Sonnet 5.5 $0.00005 $0.00920
Haiku 4.5 $0.00002 $0.00460

Measured 1mo ago against content hash c9bd48e9b1ee, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade B, and why

arch scanned grade B with 1 finding 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.

Strips warnings and disclaimersmediumAnti-refusal

Omitting safety caveats hides risk from the user and is a common jailbreak preamble.

- [ ] Compiles without warnings
skills/arch/SKILL.md · 569 lines

How it starts

The opening of the file, as written. The whole thing — 569 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Arch — Rust Project Orchestrator

Multi-phase Rust project architect. Gathers requirements interactively, designs architecture using rust-architect patterns, implements with rust-expert knowledge, then spawns a parallel review wave with rust-skills + cargo-fuzz. No frontend — pure Rust.

Skill dependencies: This skill expects rust-architect, rust-skills, cargo-fuzz, property-based-testing, and zeroize-audit installed at .claude/skills/, and rust-expert at .claude/agents/. Install via /orc:install. If installed globally at ~/.claude/ instead, adjust paths accordingly.

CRITICAL RULES

  1. Execute steps in order. Do NOT skip, reorder, or merge steps.
  2. Write output files. Each step produces its file in .arch/ before the next begins.
  3. Stop at checkpoints. PHASE CHECKPOINTs require explicit user approval via AskUserQuestion.
  4. Halt on failure. If any step fails, STOP and present the error.
  5. Never enter plan mode. This skill IS the plan — execute it.
  6. No frontend. Skip any UI/browser/component work. Pure Rust.
  7. Team only for Step 5. TeamCreate/TeamDelete scoped to the review wave only.

Pre-flight

Check for existing session

If .arch/state.json exists with status: "in_progress":

Found an in-progress arch session:
Feature: [name]
Current step: [step]

Ask via AskUserQuestion:

  • Resume — continue from saved step
  • Start fresh — archive to .arch-archived-{date}/, create new .arch/

Initialize

mkdir -p .arch

Write .arch/state.json:

{
  "feature": "$ARGUMENTS",
  "status": "in_progress",
  "crate_type": "auto-detect",
  "async_runtime": "auto-detect",
  "current_step": 1,
  "current_phase": 1,
  "completed_steps": [],
  "files_created": []
}

Detect from project:

  • Cargo.toml → crate type (bin/lib/workspace from [package] or [workspace])
  • tokio in deps → async runtime
  • Parse --crate and --async flags from $ARGUMENTS as overrides

Phase 1: Design (Steps 1-2) — Interactive

Read the full file on GitHub · 569 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 · 569 lines · 24 tokens per session scan B c9bd48e9b1ee

Subscribe to this mod's changes

arch is a skill published in the GitHub repository qGolem/orc (5 stars, last pushed 7mo ago), licensed MIT. It adds 24 tokens to every session and 4,599 once invoked, about $0.0001 per session on Opus 5.5. A static security scan graded it B with 1 finding (strips warnings and disclaimers). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

Related

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