{
  "name": "MUJ428 External Verified Effect Conformance Sandbox",
  "positioning": "Bind approved intent to verified effect.",
  "environment": "TESTNET_CONFORMANCE",
  "purpose": "Let an external agent/runtime prove it can obtain, carry, and consume an authenticated MUJ428 action-bound receipt and receive a Verified Effect without spending money or touching a real-world target.",
  "authorize": {
    "method": "POST",
    "url": "https://agents.muj428.com/v1/integration-sandbox/authorize",
    "input": {
      "action_ref": "unique caller action reference",
      "external_caller_ref": "caller-controlled URL, URI, or stable identifier",
      "payload": { "any_json_safe_value": true }
    }
  },
  "execute": {
    "method": "POST",
    "url": "https://agents.muj428.com/v1/integration-sandbox/execute",
    "input": {
      "receipt": "exact receipt returned by authorize",
      "current": "exact current-premise object returned by authorize",
      "payload": "exact payload authorized in step 1"
    }
  },
  "scope": {
    "target": "muj428://integration-sandbox/echo",
    "executor": "MUJ428 Integration Sandbox Executor",
    "assurance_level": "SANDBOX_CONFORMANCE",
    "execution_authority": "SANDBOX_ONLY",
    "production_authority": false,
    "forbidden_effects": ["payment", "fund_transfer", "wallet_signing", "external_write"],
    "moves_money": false
  },
  "verified_effect": {
    "production_effect": false,
    "production_adoption_countable": false,
    "testnet_external_countable_only_with_independent_caller_evidence": true
  },
  "example": "https://agents.muj428.com/examples/external-verified-effect.mjs",
  "auto_spend": false
}