What is umbra?
umbra is a MCP server by elberacasa that trust scores and guardrails for AI-generated code: static security rules, Docker-verified build/boot checks and receipts that catch agents lying about tests. It is listed under Security and has no public popularity data yet.
| Type | Mcp server |
|---|---|
| Author | elberacasa |
| Repository | elberacasa/umbra |
| Popularity | no public popularity data yet |
| Category | Security |
| Security | Low risk (96/100) |
| Rank | #4,289 of 4,418 MCP servers; #236 in Security |
| License | MIT |
| Last commit | 2026-08-05 |
| Runs | Locally |
| Language | TypeScript |
| Platforms | macOS, Windows, Linux |
Is umbra safe to install?
umbra 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 umbra?
- 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/elberacasa/umbra
- 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 umbra -- <command from README> claude mcp add --transport http umbra <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 umbra for you:
Add the "umbra" MCP server from https://github.com/elberacasa/umbra 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.