What is effectfence?
effectfence is a MCP server by aurumflux20 that prevents double charges and duplicate side effects from agent tool calls: concurrent races elect one winner, late duplicates replay a sealed receipt. It is listed under Developer tools and has no public popularity data yet.
| Type | Mcp server |
|---|---|
| Author | aurumflux20 |
| Repository | aurumflux20/effectfence |
| Popularity | no public popularity data yet |
| Category | Developer tools |
| Security | Low risk (96/100) |
| Rank | #3,888 of 4,418 MCP servers; #687 in Developer tools |
| License | MIT |
| Last commit | 2026-09-08 |
| Runs | Locally |
| Language | Rust |
| Platforms | macOS, Windows, Linux |
Is effectfence safe to install?
effectfence 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 effectfence?
- 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/aurumflux20/effectfence
- 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 effectfence -- <command from README> claude mcp add --transport http effectfence <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 effectfence for you:
Add the "effectfence" MCP server from https://github.com/aurumflux20/effectfence 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.