What is earth-agent-chrome-ext CLAUDE.md?

Project instructions for AI coding agents working on a Chrome extension and its server for Google Earth Engine, a platform for analysing satellite and geographic data.

Use them when building, formatting, testing, type-checking, versioning, or publishing this project.

They give agents the project’s structure, commands, version rules, and release steps in one place.

How wybert/earth-agent-chrome-ext configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to wybert/earth-agent-chrome-ext. 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/wybert/earth-agent-chrome-ext/main/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/wybert/earth-agent-chrome-ext

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/wybert/earth-agent-chrome-ext/claude-md/github.svg)](https://agentmods.dev/instructions/wybert/earth-agent-chrome-ext/claude-md)

Your own site

<a href="https://agentmods.dev/instructions/wybert/earth-agent-chrome-ext/claude-md"><img src="https://agentmods.dev/badge/instructions/wybert/earth-agent-chrome-ext/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/wybert/earth-agent-chrome-ext/claude-md"><img src="https://agentmods.dev/badge/instructions/wybert/earth-agent-chrome-ext/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 1,404 This file is loaded in full into every session.

When invoked 1,404 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	$0.01404	$0.01404
Opus 5.5	$0.00562	$0.00562
Sonnet 5.5	$0.00281	$0.00281
Haiku 4.5	$0.00140	$0.00140

Measured 8d ago against content hash d9d326c624c0, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

earth-agent-chrome-ext 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 8d 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 · 147 lines

How it starts

The opening of the file, as written. The whole thing — 147 lines — stays where its author put it; the contents beside it link to each section on GitHub.

CLAUDE.md

Guidance for Claude Code and other AI coding agents (Gemini, Cursor, Codex, etc.) working with this repository.

Project Overview

Earth Agent is a Chrome extension (Manifest V3) + MCP server for Google Earth Engine. It enables AI-powered GEE automation through chat - write code, run analysis, debug errors, explain maps. Works as a Chrome extension or via MCP with Claude Code/Cursor.

Quick Commands

npm run build          # Build extension to dist/
npm run format         # Format the code with Prettier
npm run dev            # Watch mode for development
npm run type-check     # TypeScript check
npm test               # Run Jest tests

Version Management

npm version patch      # Bump version (auto-syncs all files)
git push --follow-tags # Triggers GitHub Actions release
cd mcp-server && npm publish  # Publish MCP to npm

Version synced across: package.json, src/manifest.json, mcp-server/package.json

Project Structure

src/
├── background/        # Service worker, AI chat handler, MCP client
├── content/           # Earth Engine DOM manipulation
├── sidepanel/         # React UI
├── components/        # React components (Chat, Settings, Onboarding)
├── lib/tools/         # AI tools and services
├── lib/prompts/       # System prompts (Ask/Do modes)
└── manifest.json

mcp-server/            # MCP server (npm: earth-agent-mcp)
benchmark/             # UnivEARTH benchmark framework (Type 1 internal + Type 2 MCP)
scripts/               # version-sync.js, prepare-manifest-for-store.js
docs/                  # User docs, release notes
reference/             # Developer docs, deployment guides

MCP Server Architecture

AI Editor (Claude Code/Cursor/Zed)
    ↓ stdio (MCP Protocol)
MCP Server (earth-agent-mcp)
    ↓ WebSocket (port 3847)
Chrome Extension (Background Script)
    ↓ Chrome APIs
Google Earth Engine Code Editor

Key Files

File	Purpose
`src/background/chat-handler.ts`	AI provider integration, tool execution
`src/lib/tools/ai-tools.ts`	All AI SDK tool definitions
`src/lib/tools/services/`	Shared service layer (editor, GEE, browser)
`src/lib/prompts/gee-prompts.ts`	System prompts for Ask/Do modes

Read the full file on GitHub · 147 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.

8d ago Changed · +6 lines · +119 tokens per session d9d326c624c0
9d ago Changed · +24 lines · +324 tokens per session 09ff919fc276
2mo ago First seen · 117 lines · 961 tokens per session scan A 7101d85b86ee

Subscribe to this mod's changes

earth-agent-chrome-ext CLAUDE.md is an instructions file published in the GitHub repository wybert/earth-agent-chrome-ext (105 stars, last pushed 9d ago), licensed MIT. It adds 1,404 tokens to every session, about $0.0056 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.

earth-agent-chrome-ext CLAUDE.md next to 6 instructions from other repositories
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earth-agent-chrome-ext: Instructions file for Claude Code