Add Signet - cryptographic action signing for MCP tool calls

[willamhou]

Add Signet to the Community Servers section.

What is Signet?

Signet signs every MCP tool call with Ed25519 and maintains a hash-chained audit log. It's a client-side SigningTransport that wraps any MCP transport — servers don't need to change.

import { generateKeypair } from "@signet-auth/core";
import { SigningTransport } from "@signet-auth/mcp";

const { secretKey } = generateKeypair();
const transport = new SigningTransport(innerTransport, secretKey, "my-agent");
// Every tools/call is now signed, receipt injected into params._meta._signet

Details

• Rust core (ed25519-dalek) compiled to WASM for Node.js
• npm: @signet-auth/mcp, @signet-auth/core
• crates.io: signet-core
• CLI for identity/sign/verify/audit
• 83 tests, Apache-2.0 / MIT