What is beelzebub?
beelzebub is a MCP server by mariocandela that honeypot framework for building decoy MCP tools that an agent would never use in normal work, to detect prompt injection and malicious agent behavior. It is listed under Security and has 2,199 GitHub stars.
| Type | Mcp server |
|---|---|
| Author | mariocandela |
| Repository | mariocandela/beelzebub |
| Popularity | 2,199 GitHub stars |
| Category | Security |
| Security | Low risk (84/100) |
| Rank | #123 of 4,418 MCP servers; #5 in Security |
| License | GPL-3.0 |
| Last commit | 2026-10-16 |
| Stars this week | +5 |
| Runs | Cloud service |
Is beelzebub safe to install?
beelzebub scores 84/100 on the MCPMods security check: Low risk. Things to review: sends your data to a cloud service. It passed 4 of 6 checks.
MCP server results come from listing signals: who publishes it, where your data goes and what it can do. The code itself is not scanned yet.
| Check | Result |
|---|---|
| Community-built server | Note |
| Sends your data to a cloud service | Review |
| No credentials mentioned | Pass |
| Read-only by description | Pass |
| No code execution | Pass |
| Source on GitHub | Pass |
How do I install beelzebub?
- Find the launch command. The README says how the server starts (npx, uvx, docker or a remote URL) and which API keys it needs.
https://github.com/mariocandela/beelzebub
- Add it to Claude Code. Replace the part after -- with the command from the README. Remote servers use --transport http with a URL.
claude mcp add beelzebub -- <command from README> claude mcp add --transport http beelzebub <server-url>
- Check it connected. This lists your MCP servers and their status.
claude mcp list
Or ask Claude to set it up
Paste this into Claude Code and it installs beelzebub for you:
Add the "beelzebub" MCP server from https://github.com/mariocandela/beelzebub to Claude Code. Read its README for the launch command and any API keys I need, run claude mcp add, then check that it connects.