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Silentfail

@decksaga

Repository

About Silentfail

Diagnose MCP servers — health checks, tool testing, token cost audits, conflict detection, and security scanning with 50+ prompt injection patterns. Works as CLI or MCP server inside Claude Desktop.

#mcp#diagnostics#security#token-audit#claude#prompt-injection#cli

Config

Add this server to your MCP-compatible client using the configuration below.

{
  "mcpServers": {
    "silentfail": {
      "command": "npx",
      "args": [
        "-y",
        "silentfail@latest",
        "--mcp"
      ]
    }
  }
}

Tools

No tools detected

Fetch the live tool list by running this server in a temporary sandbox using the button above.

Overview

What is SilentFail?

SilentFail is a diagnostic and security tool for MCP servers. It discovers all connected MCP servers across supported clients, tests their health, calculates token costs, and scans for security issues like prompt injection and data exfiltration.

How to use SilentFail?

Clone the repository, install dependencies, and build. Add SilentFail as an MCP server to Claude Desktop, or run the CLI directly with commands such as silentfail for a health check, silentfail --test for a full scan, or silentfail --dashboard for the web UI.

Key features of SilentFail

  • Discovers MCP configs from all major clients.
  • Spawns servers and measures startup time.
  • Tests each tool with smart inferred parameters.
  • Calculates exact token cost per server and tool.
  • Detects tool name conflicts across servers.
  • Scans for security threats like prompt injection.

Use cases of SilentFail

  • Diagnose which MCP servers are failing silently.
  • Audit token consumption across all connected servers.
  • Perform security scanning for prompt injection or data exfiltration.
  • Validate server health in CI/CD pipelines.
  • Optimize tool selection by comparing token costs.

FAQ from SilentFail

Does SilentFail scan itself?

No, when running as an MCP server, SilentFail automatically excludes itself from the scan to avoid recursion.

Is it safe to run tool tests?

Yes. SilentFail only calls tools with read-only, minimal test inputs (stock tickers, currency codes) and never sends destructive operations.

Can I use it in CI?

Yes, use silentfail --test --json for machine-readable

Frequently asked questions

Does SilentFail scan itself?

No, when running as an MCP server, SilentFail automatically excludes itself from the scan to avoid recursion.

Is it safe to run tool tests?

Yes. SilentFail only calls tools with read-only, minimal test inputs (stock tickers, currency codes) and never sends destructive operations.

Can I use it in CI?

Yes, use `silentfail --test --json` for machine-readable

Comments

Basic information

Category

Developer Tools

Transports

stdio

Author

decksaga

Submitted by

Santiago Gutierrez

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