What is shield?
shield is a MCP server by AperionAI that local guardrail proxy for MCP servers: blocks destructive tool calls, pins tool catalogs against rug pulls and scans for tool poisoning and prompt injection. It is listed under Security and has 11 GitHub stars.
| Type | Mcp server |
|---|---|
| Author | AperionAI |
| Repository | AperionAI/shield |
| Popularity | 11 GitHub stars |
| Category | Security |
| Security | Low risk (96/100) |
| Rank | #1,676 of 4,418 MCP servers; #84 in Security |
| Last commit | 2026-10-04 |
| Runs | Locally |
| Language | Rust |
| Platforms | macOS, Windows, Linux |
Is shield safe to install?
shield scores 96/100 on the MCPMods security check: Low risk. No checks raised a concern. It passed 5 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 |
| Runs on your machine only | Pass |
| No credentials mentioned | Pass |
| Read-only by description | Pass |
| No code execution | Pass |
| Source on GitHub | Pass |
How do I install shield?
- 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/AperionAI/shield
- 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 shield -- <command from README> claude mcp add --transport http shield <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 shield for you:
Add the "shield" MCP server from https://github.com/AperionAI/shield 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.