A Geiger counter for AI agents — one read-only command that inventories every agent, MCP server, plugin, and AI extension on a machine
One read-only command that inventories every AI agent, harness, MCP server, plugin, and AI extension on a machine — and tells you, in plain language, what each one can touch.
No install. No account. No telemetry. Reads configs and directories, writes nothing (unless you ask for --json yourfile.json).
In August 2026, an open-source agent harness went from zero to 200,000+ GitHub stars in three weeks. Its plugin ecosystem passed 13,000 repositories in the same window. One-click desktop clients appeared the same day it launched. Instagram carousels now teach office workers to install all of it.
Every one of those installs is a program that can execute commands, read files, and hold credentials — configured in dotfiles nobody looks at twice. Ask yourself the question this tool answers: what is actually running on this machine, and what can it reach? Most people cannot answer it. Now it's one command.
Real output from a real machine (values redacted — see below).
Ecosystem What geiger reads ------ Claude Code global + per-project MCP servers, hooks, plugins, skills, subagents, apiKeyHelper MCP hosts Claude Desktop, Cursor, Windsurf, VS Code (user + project), Cline, Roo Code, Continue, Zed Other agents Codex CLI, Gemini CLI, Kilo CLI, Grok Build, Aider, OpenCode, Qwen Code, DeepSeek Harness, Continue, GitHub Copilot CLI, Goose, JetBrains Junie, Open Interpreter, LM Studio, Ollama Editor extensions AI extensions in VS Code / Insiders / Cursor JetBrains IDEs AI Assistant / MCP settings presence per product (the settings live inside the IDE — geiger points you at the right scre
From the project README.
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