agentmods.dev

umm: Instructions file for Claude Code

CLAUDE.md

umm CLAUDE.md is an instructions file for Claude Code from hexxt-git/umm. It costs 2,582 tokens per session, scanned A, original, MIT.

Repository instructions for umm, a command-line tool that sends questions and a skill to a configured coding agent, then prints the returned Markdown. The skill text is embedded into the program rather than loaded while it runs.

In plain words
What is it for?
Use it when changing umm's prompt behavior, CLI-only instructions, build process, or tests.
Why use it?
It identifies the two Markdown files as the main product and explains the boundary between the standalone skill and the command-line wrapper.

Instructions file for Claude Code

Written for Claude Code: the file is CLAUDE.md. Also seen: mentions CLAUDE.md; mentions Codex; mentions OpenCode.

This is hexxt-git/umm's own configuration. It tells Claude Code how to work on umm 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 umm configures →

not rated 22repo 3mo ago A scan 2,582 tokens original MIT
View source ↗ hexxt-git/umm umm.hexxt.dwv
Reuse

Borrowing it

Nothing to install: this file belongs to hexxt-git/umm. 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/hexxt-git/umm/main/CLAUDE.md
Clone the repo
git clone --depth 1 https://github.com/hexxt-git/umm

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 umm CLAUDE.md

README.md
[![agentmods](https://agentmods.dev/badge/instructions/hexxt-git/umm/claude-md/github.svg)](https://agentmods.dev/instructions/hexxt-git/umm/claude-md)
Your own site
<a href="https://agentmods.dev/instructions/hexxt-git/umm/claude-md"><img src="https://agentmods.dev/badge/instructions/hexxt-git/umm/claude-md/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 umm CLAUDE.md

Your own site · 80×15
<a href="https://agentmods.dev/instructions/hexxt-git/umm/claude-md"><img src="https://agentmods.dev/badge/instructions/hexxt-git/umm/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 2,582 This file is loaded in full into every session.
When invoked 2,582 The same file — it is already loaded in full.
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 $0.02582 $0.02582
Opus 5.5 $0.01033 $0.01033
Sonnet 5.5 $0.00516 $0.00516
Haiku 4.5 $0.00258 $0.00258

Measured 2mo ago against content hash 85a305c29567, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

umm CLAUDE.md 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 2mo 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.

CLAUDE.md · 165 lines

How it starts

The opening of the file, as written. The whole thing — 165 lines — stays where its author put it; the contents beside it link to each section on GitHub.

CLAUDE.md

What umm is

A CLI that answers a question in a compact, terminal-shaped way instead of conversational prose. It does almost nothing itself: it hands the question plus a skill (a big prompt) to whichever coding agent the user configured, then renders the markdown that comes back. The product is the skill, not the code.

The two markdown files are the real source of truth

  • SKILL.md (repo root) — the portable "brain". Defines the entire output shape and behavior. It is validated prompt content: reword it deliberately, not casually, and re-test against real queries after changing it. Root placement is intentional — it makes the repo installable as a standalone agent skill (npx skills add <owner>/umm).
  • cli.md — a CLI-only addendum bolted on at prompt-build time. It tells the agent it has no edit permissions and to redirect the user (usually: run the agent directly instead of through umm). It is deliberately not part of the standalone skill, so a npx skills install never sees it.

Both are excluded from Prettier (.prettierignore) because their exact wording/whitespace is functional.

Build model: the skill is embedded, not read at runtime

scripts/embed-skill.ts reads SKILL.md + cli.md, strips frontmatter, and writes src/skill.generated.ts (exports SKILL, CLI_ADDENDUM).

  • src/skill.generated.ts is generated and gitignored. A fresh clone must run npm run build:skill (or build / typecheck, which do it) before the CLI will run.
  • Editing SKILL.md/cli.md requires a rebuild to take effect.

Imports use .js, but the source is .ts

Relative imports are written with .js specifiers (./agents.js) even though the files are .ts. This is the tsc ESM convention (tsc resolves .js → .ts source and emits real .js). Consequence:

  • node src/index.ts does NOT work (Node won't rewrite .js → .ts).
  • Dev runs through Bun: bun src/index.ts <question> (or npm run dev).
  • npm ships the compiled dist-npm/, not the source.

Read the full file on GitHub · 165 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. 2mo ago First seen · 165 lines · 2,582 tokens per session scan A 85a305c29567

Subscribe to this mod's changes

umm CLAUDE.md is an instructions file published in the GitHub repository hexxt-git/umm (22 stars, last pushed 3mo ago), licensed MIT. It adds 2,582 tokens to every session, about $0.0103 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 2026-08-30.

Related

umm CLAUDE.md compared with instructions from other repositories

umm CLAUDE.md next to 6 instructions from other repositories
ModTypeStarsLast pushLicenceScanTokensWorks with
umm CLAUDE.mdhexxt-git/ummInstructions file223mo agoMITA2,582Claude Code
vscode buildNext.instructions.mdmicrosoft/vscodeInstructions file195kyesterdayMITA9,719GitHub Copilot
next.js AGENTS.mdvercel/next.jsInstructions file143kyesterdayMITA7,461Codex, OpenCode
langchain AGENTS.mdlangchain-ai/langchainInstructions file149kyesterdayMITA4,680Codex, OpenCode
vscode oss-third-party-notices.instructions.mdmicrosoft/vscodeInstructions file195kyesterdayMITA5,516GitHub Copilot
vscode copilot-instructions.mdmicrosoft/vscodeInstructions file195kyesterdayMITA3,093GitHub Copilot
deepseek-harness AGENTS.mddeepseek-ai/deepseek-harnessInstructions file274k2d agoMITA4,313Codex, OpenCode