WebCrypt MCP Server

WebCrypt v1.0.1

Zero-dependency Web Crypto & native AI Agent Tooling (MCP) for modern JavaScript.

[npm version] [npm downloads] [Node] [TypeScript] [MCP] [Tests] [Coverage] [PuterVision Triad] [License: MIT]

AES-256-GCM symmetric encryption, RSA-4096 hybrid public keys, ECDH key agreement, ECDSA/HMAC digital signatures, and Post-Quantum KEM (Kyber/Dilithium) — zero runtime dependencies, pure Web Crypto API.

⚡ Quickstart (15 Seconds)

1. Installation

# 📦 Install as project library (Node.js, TypeScript, Browser)npm install webcrypt
# 🌐 Install globally (CLI utilities & global MCP tools)npm install -g webcrypt

import { WebCrypt, WebCryptAsym } from "webcrypt";
// 🔒 Symmetric AES-256-GCM (600k PBKDF2 iterations)const wc = new WebCrypt();const encrypted = await wc.encryptText("Secret payload", "password");const decrypted = await wc.decryptText(encrypted, "password");
// 🔑 Asymmetric RSA-4096 Hybrid Encryptionconst wca = new WebCryptAsym();const keyPair = await wca.generateKeyPair(4096);const cipher = await wca.encryptText("Secret payload", keyPair.publicKey);const plain = await wca.decryptText(cipher, keyPair.privateKey);

2. Auto-Setup for AI Agents & IDEs (MCP Server)

# Initialize MCP server, agent skills, and rules across your projectnpx webcrypt init  # or `webcrypt init` if installed globally

Supports Google Antigravity, Cursor, Claude Desktop, VS Code / Copilot, Windsurf, Cline, and Zed.

🤖 Why AI Agents Need WebCrypt MCP

Equip autonomous coding agents with an authenticated cryptographic vault directly in their toolbelt:

• 🔐 Confidential Local Vaulting (encrypt_payload): Encrypt API keys and state memory before writing to disk to prevent prompt log leaks.
• 🛡️ Tamper-Proof Provenance (sign_verify): Cryptographically sign test evidence packs, release binaries, and code diffs with ECDSA or HMAC.
• 🤝 Inter-Agent Key Exchange (manage_keys): Ephemeral JWK keypairs (RSA-4096, ECDH P-256/P-384) for private agent-to-agent messaging.
• ⚛️ Post-Quantum Guardrails (pqc_kem_sign): Built-in Kyber KEM and Dilithium signatures future-proof long-term agent artifacts.
• ⚡ Zero Dependencies: 100% native crypto.subtle execution across Node.js 18+, Bun, browsers, and Edge runtimes.

┌───────────────────────────────────────────────────────────┐│              Autonomous AI Coding Agent                   ││     (Antigravity / Cursor / Claude / Copilot / Cline)     │└─────────┬───────────────────┬───────────────────┬─────────┘          │                   │                   │          ▼                   ▼                   ▼┌───────────────────┐┌───────────────────┐┌───────────────────┐│ state-memory-mcp  ││ vision-memory-mcp ││     webcrypt      ││  (Workflow State) ││  (Visual Cache)   ││  (Security Vault) ││  • Task Graph DAG ││  • UI Grounding   ││  • AES-256 Vault  ││  • Decisions & SDD││  • Layout Trees   ││  • RSA/ECDH Keys  ││  • Event Ledger   ││  • Visual History ││  • Digital Sigs   │└───────────────────┘└───────────────────┘└───────────────────┘

🛠️ MCP Tools Reference (6 Core Tools)

📚 Technical Documentation Directory

Explore dedicated guides in docs/ and examples/:

🌐 PuterVision Triad Standard

• 📊 @putervision/state-memory-mcp: Persistent SQLite graph for workflow states, task DAGs, and decision trails.
• 👁️ @putervision/vision-memory-mcp: Multimodal visual layout cache, AX grounding, and video replay analysis.
• 🔐 webcrypt: Zero-dependency cryptographic vault, payload encryption, key management, and digital signatures.

🧪 Testing & Diagnostics

# Run unit & integration test matrix (30 suites, 247 tests)npm test
# Run live MCP tool test runner (25 assertions, 100% verified)node .agents/skills/webcrypt-mcp/scripts/exercise_tools.js
# Audit environment & project configuration healthwebcrypt doctor

⚖️ License & Disclaimers

Developed and maintained by PuterVision. Released under the MIT License.

• 100% Local Execution Guarantee: All cryptographic operations execute locally in memory via standard W3C Web Crypto API (crypto.subtle). Zero external API calls, telemetry, or network transmissions.
• Trademarks & Non-Affiliation: Product names (Cursor, Claude, Google Antigravity, VS Code, GitHub Copilot, Windsurf, Cline, Zed) are property of their respective owners and used solely for compatibility identification.