What is local-lens CLAUDE.md?

Project instructions for Local Lens, a local development-monitoring tool that captures browser and server logs for analysis. The project includes a Chrome extension, a command-line log-capture tool, a local server, and a SQLite database, with the parts managed in a monorepo—a repository containing multiple related projects.

Use them when changing or reviewing Local Lens, especially its browser monitoring, backend log capture, local HTTP/MCP server, SQLite storage, or related subprojects.

They give an coding agent the project's structure and key components so it can work consistently across the extension, command-line tool, server, and database.

How aotakeda/local-lens configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to aotakeda/local-lens. 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/aotakeda/local-lens/main/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/aotakeda/local-lens

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/aotakeda/local-lens/claude-md/github.svg)](https://agentmods.dev/instructions/aotakeda/local-lens/claude-md)

Your own site

<a href="https://agentmods.dev/instructions/aotakeda/local-lens/claude-md"><img src="https://agentmods.dev/badge/instructions/aotakeda/local-lens/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/aotakeda/local-lens/claude-md"><img src="https://agentmods.dev/badge/instructions/aotakeda/local-lens/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 1,324 This file is loaded in full into every session.

When invoked 1,324 The same file — it is already loaded in full.

Security scan A 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.

Model	Per session	Once invoked
Fable 5.1	$0.01324	$0.01324
Opus 5.5	$0.00530	$0.00530
Sonnet 5.5	$0.00265	$0.00265
Haiku 4.5	$0.00132	$0.00132

Measured 2mo ago against content hash 3b4a7327909e, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

local-lens CLAUDE.md scanned grade A 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 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.

Runs shell commandslowCapability

Expected in a hook, worth knowing in a rule or an instructions file.

- **Process Spawn**: Uses Node.js child_process.spawn for reliable process management

CLAUDE.md · 151 lines

How it starts

The opening of the file, as written. The whole thing — 151 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.

Project Overview

Local Lens is a comprehensive 100% local development monitoring tool that captures both browser and server logs for LLM analysis. It consists of a Chrome extension for browser monitoring, a CLI tool for universal backend log capture, and an HTTP/MCP server for data access. The system is completely local with no external connections.

Architecture

High-Level Structure

Chrome Extension: Manifest v3 extension with service worker and content scripts for browser monitoring
CLI Tool: Universal process wrapper for backend log capture (any framework)
Local Server: HTTP/MCP server running on fixed port 27497
SQLite Database: Local persistence with intelligent filtering and circular buffer (10k entries)
Monorepo: Root workspace managing server, extension, and CLI subprojects

Key Components

cli/: Universal CLI tool for server log capture from any backend framework
extension/: Chrome extension with background service worker and dual content scripts
server/: Node.js/Express server with MCP integration and SQLite storage
server/src/storage/: Database layer with LogStorage class and schema management
server/src/mcp/: MCP server implementation for AI assistant access
server/src/routes/: HTTP API endpoints for log retrieval and filtering

Development Commands

Common Operations

# Install dependencies and build everything
npm install
npm run build

# Development mode (watches files, rebuilds automatically)
npm run dev

# Run tests
npm test

# Run linting
npm run lint

# Run single test file
npm test -- --testPathPattern=integration.test.ts

Server-Specific Commands

# Run server tests only
npm run test:server

# Start server in development mode
npm run dev:server

# Build server only
npm run build:server

# Build MCP server only
npm run build:mcp

# Build both HTTP and MCP servers
npm run build:all

# Build CLI tool only
npm run build:cli

Read the full file on GitHub · 151 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 · 151 lines · 1,324 tokens per session scan A 3b4a7327909e

Subscribe to this mod's changes

local-lens CLAUDE.md is an instructions file published in the GitHub repository aotakeda/local-lens (7 stars, last pushed 1y ago), licensed MIT. It adds 1,324 tokens to every session, about $0.0053 per session on Opus 5.5. A static security scan graded it A with 1 finding (runs shell commands). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

chrome chrome-extension console http mcp

local-lens CLAUDE.md next to 6 instructions from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
local-lens CLAUDE.mdaotakeda/local-lens	Instructions file	7	1y ago	MIT	A	1,324	Claude Code
vscode buildNext.instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	9,719	GitHub Copilot
next.js AGENTS.mdvercel/next.js	Instructions file	143k	yesterday	MIT	A	7,461	Codex, OpenCode
langchain AGENTS.mdlangchain-ai/langchain	Instructions file	149k	yesterday	MIT	A	4,680	Codex, OpenCode
vscode oss-third-party-notices.instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	5,516	GitHub Copilot
vscode copilot-instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	3,093	GitHub Copilot
deepseek-harness AGENTS.mddeepseek-ai/deepseek-harness	Instructions file	274k	2d ago	MIT	A	4,313	Codex, OpenCode

local-lens: Instructions file for Claude Code