Borrowing it
Nothing to install: this file belongs to receptron/mulmoclaude. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/receptron/mulmoclaude/main/CLAUDE.mdgit clone --depth 1 https://github.com/receptron/mulmoclaudeWrote 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.
[](https://agentmods.dev/instructions/receptron/mulmoclaude/claude-md)<a href="https://agentmods.dev/instructions/receptron/mulmoclaude/claude-md"><img src="https://agentmods.dev/badge/instructions/receptron/mulmoclaude/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.
<a href="https://agentmods.dev/instructions/receptron/mulmoclaude/claude-md"><img src="https://agentmods.dev/badge/instructions/receptron/mulmoclaude/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.04768 | $0.04768 |
| Opus 5.5 | $0.01907 | $0.01907 |
| Sonnet 5.5 | $0.00954 | $0.00954 |
| Haiku 4.5 | $0.00477 | $0.00477 |
Grade A, and why
mulmoclaude 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 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.
How it starts
The opening of the file, as written. The whole thing — 258 lines — stays where its author put it; the contents beside it link to each section on GitHub.
CLAUDE.md
This file provides guidance to Claude Code when working with the MulmoClaude repository.
Project Overview
MulmoClaude is a text/task-driven agent app with rich visual output. It uses Claude Code Agent SDK as the LLM core and gui-chat-protocol as the plugin layer. Shared code is published as @mulmobridge/* npm packages under packages/.
Core philosophy: The workspace is the database. Files are the source of truth. Claude is the intelligent interface.
Key Commands
- Dev server:
npm run dev(runs both client and server concurrently) - Lint:
yarn lint/ Format:yarn format/ Typecheck:yarn typecheck/ Build:yarn build - Lint findings report:
yarn lint:summary(the same reportyarn lintwrites to the Actions job summary) - Unit tests:
yarn test(node:test, server handlers + utils) - E2E tests:
yarn test:e2e(Playwright, browser UI tests — no backend needed)
IMPORTANT: After modifying any source code, always run yarn format, yarn build:packages, yarn typecheck, yarn lint, and yarn build before considering the task done.
build:packages comes first because typecheck reads the workspace packages' generated .d.ts. Skip it and you get a wall of TS7016: Could not find a declaration file for module '@mulmoclaude/*' — 150 of them on one measurement, 0 after building the packages — none of which are real. CI's own step is named "Build internal packages (required before typecheck)"; this order is the one it runs.
IMPORTANT: Always write error handling for all fetch calls. Handle both network errors (try/catch) and HTTP errors (!response.ok).
Key Rules (always apply)
Shared utilities — check before reinventing
Before writing a new helper, scan docs/shared-utils.md. If a similar helper exists, use it. When you add a new shared helper, append a 1-line entry to that catalog in the same PR. Skipping this is how truncate() ended up with 6 implementations (#1304).
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.
- 1mo ago Changed · +21 lines · +339 tokens per session 5361712dbde5
- 1mo ago Changed · +2 lines · +106 tokens per session 305b99a0a93a
- 1mo ago First seen · 235 lines · 4,323 tokens per session scan A a6a75c65ca35
mulmoclaude CLAUDE.md is an instructions file published in the GitHub repository receptron/mulmoclaude (386 stars, last pushed 2d ago), licensed MIT. It adds 4,768 tokens to every session, about $0.0191 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.
Other instructions, from other repositories
vscode buildNext.instructions.md
Working notes and architecture documentation for the new esbuild-based build system in build/next. Use when making changes to the new build pipeline (transpile/bundle commands, NLS plugin, source-map handling, resource copying, or self-hosting watch tasks).
next.js AGENTS.md
AGENTS.md instructions for vercel/next.js, covering next.js development guide, codebase structure, monorepo overview, core package: packages/next and other important packages.
vscode oss-third-party-notices.instructions.md
Instructions for microsoft/vscode, covering vs code oss third-party-notices pipeline, architecture, pipeline flow in ci, cache eligibility and rollout and applying the notice (cutover).
langchain AGENTS.md
AGENTS.md instructions for langchain-ai/langchain, covering global development guidelines for the langchain monorepo, corridor security analysis, project architecture and context, monorepo structure and development tools & commands.
vscode copilot-instructions.md
Copilot instructions for microsoft/vscode, covering vs code copilot instructions, project overview, root folders, core architecture (src/ folder) and built-in extensions (extensions/ folder).
vscode model-prompts.instructions.md
Model-specific prompt authoring and registry guidelines.