Countersign

Overview

Countersign is a Model Context Protocol server that provides independent, signed verification of AI-generated work including math, quotes, sources, links, and code. Any MCP-compatible AI assistant can call Countersign's tools directly during conversation or agent runs, with results logged publicly and verifiably.

It runs as a hosted remote service at https://countersign.llpro.ai/mcp with no local installation needed and no authentication required. The latest release is v1.0.0, available from https://countersign.llpro.ai/llms.txt.

Countersign is listed in the AI & Agents category and works with all MCP clients including Claude Desktop, Claude Code, Cursor, VS Code, Windsurf, and Zed. If you maintain Countersign, claim this listing to verify ownership and keep information current.

Installation

Settings → Connectors → Add custom connector
Name: Countersign
URL:  https://countersign.llpro.ai/mcp