Preloop

Open-source gateway that tracks spend, sets budgets and requires approvals for AI coding agents and their tool calls.

preloop.ai · Free

Visit preloop.ai ↗would rather buy than build

Details

What it does: Security and passwords, Developer tools
Who it’s for: Developers, Software companies
Pricing: Free
Works on: Mac, Windows, Linux
Extras: Open source, Can self-host
Works with: claude code, codex cli, cursor, gemini cli, slack, mattermost
Tags: ai agents, mcp firewall, ai gateway, cost control, audit trail, approvals

AgentKey
Gives AI agents API keys only after a person approves the request, stores them encrypted and logs every access.
Security and passwords · Developers
Alpacon
Checks and approves each command AI agents run on production servers and keeps an audit trail, for engineering teams.
Security and passwords · Developers
Kastra
Checks each AI agent action, like a shell command or API call, against policy and logs why it was allowed or blocked.
Since 2026
Free trial · Security and passwords · Developers
SigmaShake
Checks each tool call from AI coding agents against your rules and blocks or rewrites risky ones before they run.
Subscription · Security and passwords · Developers