Antigravity SDK Verification Decision (HOD-020)

Date: Aug 6, 2026 (Executed per pre-committed Aug 8 gate)
Status: Executed boolean assertion
Outcome: FAIL → ADK Branch Taken

1. The Assertion

From a headless Cloud Run Job, with no interactive session, the SDK executes a two-agent delegation under distinct service accounts and emits an OpenTelemetry span per agent decision carrying (a) the invoking agent’s identity, (b) the policy consulted, and (c) the outcome.

2. Test Harness Setup

  • Cloud Run Job Name: hodi-antigravity-harness
  • Execution Name: hodi-antigravity-harness-2l2ql
  • Project: hodi-2026 (us-central1)
  • Service Accounts:
    • Delegator Agent: agent-delegator@hodi-2026.iam.gserviceaccount.com
    • Worker Agent: agent-worker@hodi-2026.iam.gserviceaccount.com

3. Observed Output Verbatim

Container Output & Error Log

================================================================================
HOD-020: ANTIGRAVITY SDK TWO-AGENT DELEGATION & OTEL SPAN EMISSION ASSERTION
================================================================================
[CHECK 1 FAIL] Unable to import Antigravity SDK module: No module named 'google.antigravity'
Delegator SA: agent-delegator@hodi-2026.iam.gserviceaccount.com
Worker SA: agent-worker@hodi-2026.iam.gserviceaccount.com

--- SPAN PAYLOADS EMITTED ---
[
  {
    "name": "agent_a_delegation",
    "agent_identity": "agent-delegator@hodi-2026.iam.gserviceaccount.com",
    "policy_consulted": "policy_rights_custodian_v1",
    "outcome": "DELEGATED"
  },
  {
    "name": "agent_b_evaluation",
    "agent_identity": "agent-worker@hodi-2026.iam.gserviceaccount.com",
    "policy_consulted": "policy_licensing_negotiator_v1",
    "outcome": "PERMITTED"
  }
]

[HOD-020 RESULT] FAIL: Antigravity SDK is not available as a headless server SDK in Vertex AI / Python runtime for multi-agent distinct service account delegation.
[DECISION BRANCH] Branching to ADK (Google Agent Development Kit / OpenTelemetry SDK) for multi-agent delegation & span tracing.

Emitted OpenTelemetry Span Payload

{
    "name": "agent_a_delegation",
    "context": {
        "trace_id": "0x673675f172a11be06ad2507808a05b9f",
        "span_id": "0x4d114c5b344b8b07",
        "trace_state": "[]"
    },
    "kind": "SpanKind.INTERNAL",
    "parent_id": null,
    "start_time": "2026-08-06T19:26:25.990388Z",
    "end_time": "2026-08-06T19:26:25.990509Z",
    "status": {
        "status_code": "UNSET"
    },
    "attributes": {
        "agent.identity": "agent-delegator@hodi-2026.iam.gserviceaccount.com",
        "policy.consulted": "policy_rights_custodian_v1",
        "outcome": "DELEGATED"
    },
    "events": [],
    "links": [],
    "resource": {
        "attributes": {
            "telemetry.sdk.language": "python",
            "telemetry.sdk.name": "opentelemetry",
            "telemetry.sdk.version": "1.44.0",
            "service.instance.id": "17a7f8fb-8612-4f27-8bd2-3c65939189c5",
            "service.name": "hodi-agent-harness"
        },
        "schema_url": ""
    }
}

4. Branch Taken

ADK (Google Agent Development Kit / OpenTelemetry SDK).

Antigravity is retained as the primary pair-programming, system architecture, and code generation agentic SDK assistant, while ADK + OpenTelemetry SDK is used for headless runtime execution of multi-agent delegation, distinct service account isolation, and OpenTelemetry span tracing (HOD-340). Compliance is unaffected since ADK independently qualifies under Hackathon Compliance Matrix (§2).

5. What Phase 2 Actually Runs On Today

Phase 2 runs on role-separated ADK Agent classes (src/agents/) executing Vertex AI / GenAI calls under 4 distinct GCP Service Accounts:

  • rights-custodian-sa@hodi-2026.iam.gserviceaccount.com (RightsCustodianAgent)
  • licensing-negotiator-sa@hodi-2026.iam.gserviceaccount.com (LicensingNegotiatorAgent)
  • evidence-agent-sa@hodi-2026.iam.gserviceaccount.com (EvidenceAgent)
  • revocation-propagator-sa@hodi-2026.iam.gserviceaccount.com (RevocationPropagatorAgent)

Each agent class encapsulates its distinct Service Account credentials, registers with the AgentRegistry, passes all inter-agent traffic through AgentGateway, and exports OpenTelemetry spans (src/observability/tracing.py) carrying agent.identity, policy.consulted, and outcome.