Aletheia MCP Server

by vikasny30io.github.vikasny30/aletheia-mcpv0.3.1

Deterministic pre-execution filter for agent tool calls that blocks scope creep (credential reads, SSRF, destructive shell/SQL) and prompt injection.

12Node.jsstdioofficial registry

context tax

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security

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cold start

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freshness

Active27d ago

Install Aletheia MCP server

claude mcp add aletheia -e ALETHEIA_OPERATOR_SECRET='<aletheia-operator-secret>' -- npx -y aletheia-mcp

{
  "mcpServers": {
    "aletheia": {
      "command": "npx",
      "args": [
        "-y",
        "aletheia-mcp"
      ],
      "env": {
        "ALETHEIA_OPERATOR_SECRET": "<aletheia-operator-secret>"
      }
    }
  }
}

Add to ~/.cursor/mcp.json (global) or .cursor/mcp.json (project).

{
  "mcpServers": {
    "aletheia": {
      "command": "npx",
      "args": [
        "-y",
        "aletheia-mcp"
      ],
      "env": {
        "ALETHEIA_OPERATOR_SECRET": "<aletheia-operator-secret>"
      }
    }
  }
}

Settings → Developer → Edit Config (claude_desktop_config.json), then restart.

{
  "servers": {
    "aletheia": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "aletheia-mcp"
      ],
      "env": {
        "ALETHEIA_OPERATOR_SECRET": "<aletheia-operator-secret>"
      }
    }
  }
}

Add to .vscode/mcp.json in your workspace.

{
  "mcpServers": {
    "aletheia": {
      "command": "npx",
      "args": [
        "-y",
        "aletheia-mcp"
      ],
      "env": {
        "ALETHEIA_OPERATOR_SECRET": "<aletheia-operator-secret>"
      }
    }
  }
}

Add to ~/.codeium/windsurf/mcp_config.json.

Configuration

Variable	Required	Secret	Description
ALETHEIA_ALLOW_WRITE	—	—	Set to "true" to authorize filesystem writes (equivalent to --allow-write).
ALETHEIA_ALLOW_NETWORK	—	—	Set to "true" to authorize outbound network requests (equivalent to --allow-network).
ALETHEIA_ALLOW_LOOPBACK	—	—	Set to "true" to authorize requests to localhost / 127.0.0.1 (equivalent to --allow-loopback).
ALETHEIA_OPERATOR_SECRET	—	yes	Operator token required to loosen an already-running session's mandate at runtime.

Freshness

Active — last maintenance signal 27d ago. The newest of the signals below sets the band.

Last commit (default branch)
2026-09-12 · 28d ago · GitHub
Latest release
2026-09-12 · 28d ago · GitHub · v0.3.1
Package published
no data · npm/PyPI
Registry entry updated
2026-09-13 · 27d ago · official registry · v0.3.1

FAQ

›How do I install the Aletheia MCP server in Claude Code?

Run: claude mcp add aletheia -e ALETHEIA_OPERATOR_SECRET='<aletheia-operator-secret>' -- npx -y aletheia-mcp. For Cursor, VS Code, Claude Desktop and Windsurf, use the install tabs above.

›Does Aletheia require an API key?

Yes. It expects ALETHEIA_OPERATOR_SECRET, of which 1 is a secret.

›Can I use Aletheia as a remote (hosted) MCP server?

No hosted endpoint is published; it runs locally over stdio.

›Is Aletheia in the official MCP registry?

Yes, as io.github.vikasny30/aletheia-mcp.