{
      "tool_id": "art-130-signature-directory-validator",
      "tool_version": "1.0.0",
      "display_name": "HTTP Signatures Directory Validator",
      "mcp_name": "validate_signature_directory",
      "mandate_type": "compliance_mandate",
      "wave": 24,
      "gpu": false,
      "url": "https://ainumbers.co/chaingraph/art-130-signature-directory-validator.html",
      "description": "Validate the /.well-known/http-message-signatures-directory JWKS: well-formed, keys are OKP/Ed25519, the keyid from Signature-Input resolves to a key in the directory, well-known path correct. Agent fetches the directory once and passes the JSON. Consumes art-129, feeds art-131.",
      "input_schema_ref": "chaingraph/art-130-signature-directory-validator.html#manifest",
      "consumes": [
        "art-129-webbotauth-signature-verifier"
      ],
      "feeds": [
        "art-131-signature-agent-card-validator"
      ],
      "status": "live",
      "conformance_fixtures": true,
      "compute_capability": "server",
      "compute_images": [{"system":"sha256-source","image_id":"sha256:77d084f5d2d837ac21a389f2d1b651d8e3fe5faca6b43a737b22be0bfeaf6532","valid_from":"2026-07-10"},{"system":"risc0","image_id":"sha256:a1a0bc89b5b1febaeda3519f6dbade0fa5ac16beeb143c4e1b01689573567bc6","valid_from":"2026-06-28"}],
      "compute_proof": {
    "type": "ZkVmReceipt",
    "system": "risc0",
    "receiptFormat": "groth16-bn254",
    "imageId": "sha256:a1a0bc89b5b1febaeda3519f6dbade0fa5ac16beeb143c4e1b01689573567bc6",
    "seal": "E0eB+n/pz0hl0ajQG3qm9qsqSUB3Rn91CEAY+GMNCekCwL+toxInMZubtXgZ/TJBPf5E1oL3n/FF+4yw//M/JQLHIJtZfzKyB9tWdIsouhM1bLBdrWq6Rld3xFIzyCyzL1FECjknORAp1lwpPeg4JWPXL5bKm/g872F5Wk3hggcC9fm3zFZAIG0ZLqg3nukbYJhWmoL4xXad4tfpA8QYfgLbSXwljMOypLrwJst/c/kbNcRUdpU9Vw9mn0OiSdT1A5hXQxlxI9WVUd6Bo8i4M2AQnoT3HFISGho7QzveSvoNQ2/7QSuEqZ83e/KU3xhl4M4sJVkzNNHSCbYexJL2vQ==",
    "journal": {
      "chaingraph_version": "0.4.0",
      "kernel_digest": "sha256:77d084f5d2d837ac21a389f2d1b651d8e3fe5faca6b43a737b22be0bfeaf6532",
      "output": {
        "algorithm_ok": true,
        "directory_valid": true,
        "key_count": 1,
        "key_found": true,
        "path_ok": true
      }
    }
  },
      "export_capability": [
        "json",
        "vc"
      ]
    }