What is mulmoclaude CLAUDE.md?

Development guidance for MulmoClaude, a text-and-task agent application with a visual interface, shared npm packages, and browser and server tests.

Use it when developing MulmoClaude, running its development server, changing shared packages, or verifying changes with unit, end-to-end, and quality checks.

It documents the main development commands and the checks required after source changes, including formatting, linting, type checking, building, and tests.

How receptron/mulmoclaude configures Claude Code

Reuse

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.

Copy the file

curl -O https://raw.githubusercontent.com/receptron/mulmoclaude/main/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/receptron/mulmoclaude

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.

README.md

[![agentmods](https://agentmods.dev/badge/instructions/receptron/mulmoclaude/claude-md/github.svg)](https://agentmods.dev/instructions/receptron/mulmoclaude/claude-md)

Your own site

<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.

Your own site · 80×15

<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>

Per session 4,323 This file is loaded in full into every session.

When invoked 4,323 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.

Model	Per session	Once invoked
Fable 5.1	$0.04323	$0.04323
Opus 5	$0.02161	$0.02161
Sonnet 5	$0.00865	$0.00865
Haiku 4.5	$0.00432	$0.00432

Measured 9d ago against content hash a6a75c65ca35, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-08, from the pricing page.

Security

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 9d 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 · 235 lines

How it starts

The opening of the file, as written. The whole thing — 235 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 report yarn lint writes 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 lint, yarn typecheck, and yarn build before considering the task done.

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).

Constants — no magic literals

Time: NEVER use raw numbers (1000, 60000, 3600000). Import from server/utils/time.ts
Strings: scheduler types, event types, API routes, tool names — use existing as const objects
Paths: use WORKSPACE_PATHS / WORKSPACE_DIRS / WORKSPACE_FILES — never hardcode

File I/O — domain modules only

NEVER use raw fs.readFile / fs.writeFile in route handlers. Use server/utils/files/<domain>-io.ts. All writes go through writeFileAtomic.

Read the full file on GitHub · 235 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.

9d ago First seen · 235 lines · 4,323 tokens per session scan A a6a75c65ca35

Subscribe to this mod's changes

mulmoclaude CLAUDE.md is an instructions file published in the GitHub repository receptron/mulmoclaude (346 stars, last pushed today), licensed MIT. It adds 4,323 tokens to every session, about $0.0216 per session on Opus 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.

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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).

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mulmoclaude: Instructions file for Claude Code