The agent harness performance optimization system. Skills, instincts, memory, security, and research-first development for Claude Code, Codex, Opencode, Cursor and beyond.
Geiger
A Geiger counter for AI agents — one read-only command that inventories every agent, MCP server, plugin, and AI extension on a machine
Install
$
npx geiger-scanClaude Code
claude mcp add geiger -- npx geiger-scanCursor / Claude Desktop (mcp.json)
{
"mcpServers": {
"geiger": {
"command": "npx",
"args": [
"geiger-scan"
]
}
}
}Install command taken from the project's README or registry entry. Always review code before running it.
README excerpt
Read full README on GitHub →geiger
A Geiger counter for AI agents.
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.
npx geiger-scan
No install. No account. No telemetry. Reads configs and directories, writes
nothing (unless you ask for --json yourfile.json).
Why this exists
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.
What a scan looks like
GEIGER · a Geiger counter for AI agents
machine dev-laptop · 2026-09-06 12:24 UTC · read-only · no telemetry
──────────────────────────────────────────────────────────────
9 findings across 3 ecosystems · 7 can execute code · 1 credential in config files
claude-code (6)
Claude Code agent
[EXECUTES] [BROAD-FILESYSTEM] [NETWORK]
origin: registry · @anthropic-ai/claude-code
magic (Claude Code · global) MCP server
[EXECUTES] [HOLDS-SECRETS] [BROAD-FILESYSTEM]
origin: registry · @21st-dev/magic@latest
credential: "API_KEY" — opaque value under a credential-named key · ~/.claude.json
note: wrapped by a policy agent (domainguard-agent.exe) — enforcement layer in front of the server
hooks: UserPromptSubmit, PreToolUse hook
[EXECUTES]
note: hooks execute without a prompt each time their event fires
...
Real output from a real machine (values redacted — see below).
What it detects
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