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webcrypt-mcp

Skill114 starsChanged 46 days agoMITView on GitHub

Teaches the agent to use the WebCrypt MCP server for AES-256-GCM symmetric encryption, RSA-4096 hybrid encryption, key generation, digital signatures, hashing, and post-quantum cryptography. Includes automated test scripts for exercising all MCP tools.

5 other projects use a version of this, 3 of them edited.

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The file

We split this skill into the rules it gives an agent

3 rules. 0 are common, 0 are distinctive, and 3 are very specific to this project.

  • 0

    Common

    Most of the 3 edited versions we read keep these.

  • 0

    Distinctive

    This author's own choices. Worth a look.

  • 3

    Very specific

    Tied to their project's names, files or tools. Probably skip.

  • Common
  • Distinctive
  • Very specific
  1. Very specific:

    Key Management: Use manage_keys(action: "generate", type: "rsa" | "ecdh" | "ecdsa" | "rsa-pss" | "hmac") to generate cryptographically …

    line 12
  2. Very specific:

    Integrity & Signatures: Before completing tasks that produce verifiable evidence (such as evidence packs or release binaries), compute …

    line 13
  3. Very specific:

    Add "command(webcrypt-mcp)" or "command(npx webcrypt mcp)" to global agent permission grants.

    line 38

“Common” is measured: kept by at least 6 in 10 of the 3 edited versions of this file we could read. “Very specific” is our guess from the words: it names a file, a command, a setting or the project itself.

Keep what fits and drop the rest. Your version, ready for your agents.
Files
SKILL.md

Cryptographic Memory & Vault Tooling (webcrypt-mcp)

This project provides webcrypt-mcp, a native Model Context Protocol server for zero-dependency AES-256-GCM encryption, RSA-4096 hybrid public-key encryption, digital signatures, cryptographic hashes, and post-quantum cryptography.

1. Mandatory Workflow & Priority

  1. Confidential Artifacts: Whenever saving sensitive credentials, tokens, or private workflow states, encrypt them using encrypt_payload(mode: "data", password: "...") or encrypt_payload(mode: "symmetric", password: "...").
  2. Key Management: Use manage_keys(action: "generate", type: "rsa" | "ecdh" | "ecdsa" | "rsa-pss" | "hmac") to generate cryptographically strong JWK-formatted keys for inter-agent communication.
  3. Integrity & Signatures: Before completing tasks that produce verifiable evidence (such as evidence packs or release binaries), compute signatures or HMAC tags using sign_verify(action: "sign", algorithm: "ECDSA" | "HMAC").
  4. Triple Memory Triad:
    • state-memory-mcp: Workflow state tracking.
    • vision-memory-mcp: Visual state caching.
    • webcrypt-mcp: Encryption of sensitive DAG nodes, visual cache database vaults, and signature verification.

2. Complete Tool Reference

Tool NameKey InputsDescription
encrypt_payloadmode ('symmetric' | 'asymmetric' | 'data'), data, password?, public_key_jwk?Encrypt plaintext, JSON object, or binary data.
decrypt_payloadmode ('symmetric' | 'asymmetric' | 'data'), ciphertext, password?, private_key_jwk?Decrypt ciphertext back to plaintext or structured JSON.
manage_keysaction ('generate' | 'generate_random_password'), type ('rsa' | 'ecdh' | 'ecdsa' | 'rsa-pss' | 'hmac'), modulusLength?, namedCurve?, length?Generate cryptographic keys (JWK format) or secure random passwords.
crypto_hashalgorithm ('SHA-256' | 'SHA-384' | 'SHA-512' | 'SHA3-256' | 'SHA3-512'), data, encoding ('hex' | 'base64')Compute cryptographic hash digests.
sign_verifyaction ('sign' | 'verify'), algorithm ('ECDSA' | 'RSA-PSS' | 'HMAC' | 'HMAC-SHA3'), data, signature?, password?, key_jwk?Sign or verify messages with ECDSA, RSA-PSS, or HMAC.
pqc_kem_signaction ('generate_kyber_keypair' | 'kyber_encapsulate' | 'kyber_decapsulate' | 'hybrid_encapsulate' | 'hybrid_decapsulate' | 'generate_dilithium_keypair' | 'dilithium_sign' | 'dilithium_verify'), level?, public_key_b64?, private_key_b64?, ...Post-quantum Kyber KEM, Dilithium signatures, and Hybrid KEM.

3. Automated MCP Tool Exercise & Verification

To verify that the MCP server and all 6 tools are operating correctly in the current environment:

node .agents/skills/webcrypt-mcp/scripts/exercise_tools.js

4. Agent Permissions & Auto-Run Configuration

To allow WebCrypt MCP tools to run seamlessly without interactive confirmation:

  • Add "command(webcrypt-mcp)" or "command(npx webcrypt mcp)" to global agent permission grants.

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