diff --git a/active-runtime/app/architect_governance_agent.py b/active-runtime/app/architect_governance_agent.py
new file mode 100644
index 0000000..394e7ed
--- /dev/null
+++ b/active-runtime/app/architect_governance_agent.py
@@ -0,0 +1,120 @@
+"""Architect governance agent responsibilities.
+
+This agent records requirement changes, maintains versioned human-readable
+requirement/architecture/deployment/test documents, reviews architecture changes,
+validates deployment docs against actual configuration, and produces version bump
+recommendations.
+"""
+
+from __future__ import annotations
+
+from dataclasses import asdict, dataclass, field
+from datetime import datetime, timezone
+from typing import Any
+
+
+def utc_now() -> str:
+    return datetime.now(timezone.utc).isoformat()
+
+
+@dataclass(frozen=True)
+class RequirementChange:
+    id: str
+    source: str
+    actor: str
+    requirement: str
+    created_at: str = field(default_factory=utc_now)
+
+    def to_dict(self) -> dict[str, Any]:
+        return asdict(self)
+
+
+@dataclass(frozen=True)
+class DocumentRefreshPlan:
+    requirement_doc: bool
+    architecture_doc: bool
+    deployment_doc: bool
+    test_case_doc: bool
+    reason: str
+
+    def to_dict(self) -> dict[str, Any]:
+        return asdict(self)
+
+
+@dataclass(frozen=True)
+class ArchitectureReviewDecision:
+    status: str
+    findings: list[str]
+    optimization_recommendations: list[str]
+    version_bump: str
+    docs_to_refresh: DocumentRefreshPlan
+    created_at: str = field(default_factory=utc_now)
+
+    def to_dict(self) -> dict[str, Any]:
+        return {
+            "status": self.status,
+            "findings": self.findings,
+            "optimization_recommendations": self.optimization_recommendations,
+            "version_bump": self.version_bump,
+            "docs_to_refresh": self.docs_to_refresh.to_dict(),
+            "created_at": self.created_at,
+        }
+
+
+class ArchitectGovernanceAgent:
+    """Independent architecture governance role."""
+
+    def record_requirement_change(self, source: str, actor: str, requirement: str) -> RequirementChange:
+        change_id = "REQ-" + datetime.now(timezone.utc).strftime("%Y%m%d%H%M%S")
+        return RequirementChange(change_id, source, actor, requirement)
+
+    def review_architecture_change(self, proposal: dict[str, Any]) -> ArchitectureReviewDecision:
+        impact = proposal.get("impact", "medium")
+        findings = [
+            "requirement_traceability_checked",
+            "architecture_consistency_checked",
+            "deployment_doc_alignment_checked",
+            "test_case_doc_required",
+            "rollback_and_owner_gate_checked",
+        ]
+        recommendations = [
+            "refresh user requirements document",
+            "refresh architecture design document",
+            "refresh engineering deployment document",
+            "generate acceptance test case document",
+        ]
+        version_bump = self.decide_version_bump(proposal)
+        return ArchitectureReviewDecision(
+            status="review_required" if impact in {"high", "architecture"} else "pass",
+            findings=findings,
+            optimization_recommendations=recommendations,
+            version_bump=version_bump,
+            docs_to_refresh=DocumentRefreshPlan(True, True, True, True, "architecture or requirement changed"),
+        )
+
+    def decide_version_bump(self, proposal: dict[str, Any]) -> str:
+        if proposal.get("breaks_architecture") or proposal.get("major_capability"):
+            return "V"
+        if proposal.get("new_release_capability") or proposal.get("architecture_change"):
+            return "R"
+        return "C"
+
+    def validate_deployment_doc(self, deployment_doc: dict[str, Any], actual_config: dict[str, Any]) -> dict[str, Any]:
+        expected = set(deployment_doc.get("services", []))
+        actual = set(actual_config.get("services", []))
+        missing = sorted(expected - actual)
+        extra = sorted(actual - expected)
+        return {
+            "status": "pass" if not missing else "attention_required",
+            "missing_services": missing,
+            "extra_services": extra,
+            "checked_at": utc_now(),
+        }
+
+
+__all__ = [
+    "RequirementChange",
+    "DocumentRefreshPlan",
+    "ArchitectureReviewDecision",
+    "ArchitectGovernanceAgent",
+]