What is mobius-mcp CLAUDE.md?

A project guide for the Mobius MCP repository, a codebase that includes a browser extension, server, client, and shared capture package. It explains setup, building, and watch mode for active development.

Use it when setting up the repository, building all or one workspace, or running the extension and server in watch mode.

It prevents common workspace mistakes, such as installing dependencies inside one package or using outdated shared-package code.

How Topman-14/mobius-mcp configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to Topman-14/mobius-mcp. 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/Topman-14/mobius-mcp/main/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/Topman-14/mobius-mcp

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/topman-14/mobius-mcp/claude-md/github.svg)](https://agentmods.dev/instructions/topman-14/mobius-mcp/claude-md)

Your own site

<a href="https://agentmods.dev/instructions/topman-14/mobius-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/topman-14/mobius-mcp/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/topman-14/mobius-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/topman-14/mobius-mcp/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 3,055 This file is loaded in full into every session.

When invoked 3,055 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	$0.03055	$0.03055
Opus 5.5	$0.01222	$0.01222
Sonnet 5.5	$0.00611	$0.00611
Haiku 4.5	$0.00305	$0.00305

Measured 2mo ago against content hash 19eeb6d50f16, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

mobius-mcp 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 · 111 lines

How it starts

The opening of the file, as written. The whole thing — 111 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 (claude.ai/code) when working with code in this repository.

Commands

Setup

npm install

Root-only. This is an npm workspaces monorepo (apps/*, packages/*) — installing inside an individual workspace folder fights the root's symlinked node_modules and is never necessary.

Build

npm run build

Builds every workspace in dependency order: packages/capture-core → apps/mcp-server / apps/npm-client / apps/browser-extension. The apps consume packages/capture-core's built dist/ output, not its TypeScript source — after editing it, rebuild before an app will see the change (or use watch mode).

Build one workspace:

npm run build -w packages/capture-core
npm run build -w apps/mcp-server

Watch mode (active development)

npm run watch

Does a one-time build of packages/capture-core, then runs three labeled watchers in parallel: [packages] (tsc -b --watch), the extension's Vite dev server + esbuild watcher for the standalone content-script/injected bundles, and apps/mcp-server's tsup --watch. Load the extension once via chrome://extensions → Developer Mode → Load unpacked → apps/browser-extension/dist; background/popup/options changes hot-reload via crxjs, but content-script.ts/injected.ts changes only take effect the next time they're injected (reload the target tab or toggle capture off/on).

If only the shared packages need rebuilding (e.g. working on apps/npm-client or apps/mcp-server without the extension watchers):

npm run watch -w packages/capture-core

Run the MCP server from source

npm run start --workspace=apps/mcp-server

Test / lint

npm run test and npm run lint exist at the root (--workspaces --if-present) and run in CI, but no workspace currently defines a test or lint script — there is no test suite or lint config in this repo yet.

Architecture

One shared package implements one pipeline: a browser client captures runtime events and streams them over a local WebSocket to a Node server, which exposes them to AI agents as MCP tools over stdio.

Read the full file on GitHub · 111 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.

2mo ago First seen · 111 lines · 3,055 tokens per session scan A 19eeb6d50f16

Subscribe to this mod's changes

mobius-mcp CLAUDE.md is an instructions file published in the GitHub repository Topman-14/mobius-mcp (19 stars, last pushed 2mo ago), licensed MIT. It adds 3,055 tokens to every session, about $0.0122 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.

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mobius-mcp: Instructions file for Claude Code