# Geiger

> Updated 2026-09-09 · type: tool · category: mcp-agents · status: active · rev 1

Geiger is a read-only CLI that shows every AI agent, MCP server and plugin on your machine and what each can touch.

- Open source: yes (MIT)
- Self-hostable: yes
- Pricing model: free
- Best for: Engineers who want a fast, local, no-telemetry inventory of what their installed agents and MCP servers can access.
- Last verified: 2026-09-09

- **Canonical:** https://gtmstacker.com/registry/tool/geiger/
- **Source:** [github · Atomburstofficial/geiger](https://github.com/Atomburstofficial/geiger)
- **Tags:** mcp-agents, agent-security, observability, least-privilege, governance, cli
- **Repository:** https://github.com/Atomburstofficial/geiger

## Is Geiger open source?

Yes, Geiger is open source under the MIT license.

## How much does Geiger cost?

Geiger is free to use.

## Can I self-host Geiger?

Yes, Geiger can be self-hosted (the source is available under the MIT license).

## Alternatives & related

- [MagicVault](https://gtmstacker.com/registry/tool/magicvault/)


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Open-source, dependency-free CLI (JavaScript) that inventories every AI agent, MCP server, plugin and extension on a machine and reports what each can access — read-only, no install, no telemetry. Agent observability and least-privilege review for a local stack.

## Provenance

- MIT independently WebFetch-verified 2026-09-09 (26★, 10 commits; dependency-free JavaScript). Best HN traction of the pull (14 points). Surfaced via the 2026-09-09 daily pull agent-safety cluster.
- Curated from the GTM Stacker signal registry (2026-09-09 pass: daily pull + viral-posts brief); license independently WebFetch-verified 2026-09-09.