Show HN: Geiger – See every AI agent on your machine and what it can touch (github.com)

Geiger, a tool described as a "Geiger counter for AI agents," allows users to generate a comprehensive inventory of all AI agents and their permissions on a machine with a single command. Using the command `npx geiger-scan`, users can see what each agent can execute, read, or access, while ensuring no data leaves the machine. The tool is significant for the AI/ML community as it addresses the growing complexity and potential security risks associated with the explosion of AI agents and their plugin ecosystems, which surged from zero to over 200,000 GitHub stars in just three weeks in August 2026. Geiger offers detailed insight into the capabilities of each AI agent, including their origins and the level of access they possess. It scans commonly used directories and configuration files, highlighting any potential security issues by flagging agents that can execute code or hold sensitive credentials. Importantly, Geiger respects user privacy by not collecting any telemetry data, while also providing essential remediation guidance for any findings. This emphasis on transparency and security makes Geiger a vital tool for developers and organizations seeking to maintain control over their machine's AI configurations and prevent unauthorized access.