What is fenestra?
fenestra is a MCP server by richer-richard that headless rendering and verification of native Rust GUIs: accessibility tree, semantic selectors, contrast and focus-order checks, and screenshot diffs. It is listed under Developer tools and has 13 GitHub stars.
| Type | Mcp server |
|---|---|
| Author | richer-richard |
| Repository | richer-richard/fenestra |
| Popularity | 13 GitHub stars |
| Category | Developer tools |
| Security | Low risk (96/100) |
| Rank | #1,557 of 4,418 MCP servers; #358 in Developer tools |
| License | Apache-2.0 |
| Last commit | 2026-09-19 |
| Runs | Locally |
| Language | Rust |
Is fenestra safe to install?
fenestra 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 fenestra?
- 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/richer-richard/fenestra/tree/main/fenestra-mcp
- 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 fenestra -- <command from README> claude mcp add --transport http fenestra <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 fenestra for you:
Add the "fenestra" MCP server from https://github.com/richer-richard/fenestra/tree/main/fenestra-mcp 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.