diff --git a/prisma/migrations/20260531000000_rls_phase1_agentpermissiongrant/migration.sql b/prisma/migrations/20260531000000_rls_phase1_agentpermissiongrant/migration.sql
new file mode 100644
index 00000000..af141129
--- /dev/null
+++ b/prisma/migrations/20260531000000_rls_phase1_agentpermissiongrant/migration.sql
@@ -0,0 +1,42 @@
+-- RLS Phase 1 #6 — AgentPermissionGrant (TENANT_DIRECT)
+-- Security-sensitive: governs A2A permission delegation between agents.
+
+-- 1. Composite index for RLS performance (CRITICAL)
+CREATE INDEX IF NOT EXISTS "AgentPermissionGrant_organizationId_id_idx"
+  ON "AgentPermissionGrant" ("organizationId", "id");
+
+-- 2. Enable RLS with FORCE (so table owner also obeys policies)
+ALTER TABLE "AgentPermissionGrant" ENABLE ROW LEVEL SECURITY;
+ALTER TABLE "AgentPermissionGrant" FORCE ROW LEVEL SECURITY;
+
+-- 3. Grants
+GRANT SELECT, INSERT, UPDATE, DELETE ON "AgentPermissionGrant" TO app_user;
+GRANT SELECT, INSERT, UPDATE, DELETE ON "AgentPermissionGrant" TO admin_user;
+
+-- 4. Policies (admin_user has BYPASSRLS — no policies needed for it)
+CREATE POLICY agentpermissiongrant_select ON "AgentPermissionGrant"
+  FOR SELECT TO app_user
+  USING ("organizationId" = current_setting('app.current_org_id', true));
+
+CREATE POLICY agentpermissiongrant_insert ON "AgentPermissionGrant"
+  FOR INSERT TO app_user
+  WITH CHECK ("organizationId" = current_setting('app.current_org_id', true));
+
+CREATE POLICY agentpermissiongrant_update ON "AgentPermissionGrant"
+  FOR UPDATE TO app_user
+  USING ("organizationId" = current_setting('app.current_org_id', true))
+  WITH CHECK ("organizationId" = current_setting('app.current_org_id', true));
+
+CREATE POLICY agentpermissiongrant_delete ON "AgentPermissionGrant"
+  FOR DELETE TO app_user
+  USING ("organizationId" = current_setting('app.current_org_id', true));
+
+-- =========================================================================
+-- Rollback (uncomment to revert)
+-- =========================================================================
+-- DROP POLICY IF EXISTS agentpermissiongrant_select ON "AgentPermissionGrant";
+-- DROP POLICY IF EXISTS agentpermissiongrant_insert ON "AgentPermissionGrant";
+-- DROP POLICY IF EXISTS agentpermissiongrant_update ON "AgentPermissionGrant";
+-- DROP POLICY IF EXISTS agentpermissiongrant_delete ON "AgentPermissionGrant";
+-- ALTER TABLE "AgentPermissionGrant" DISABLE ROW LEVEL SECURITY;
+-- DROP INDEX IF EXISTS "AgentPermissionGrant_organizationId_id_idx";
diff --git a/src/app/api/agents/[agentId]/permissions/route.ts b/src/app/api/agents/[agentId]/permissions/route.ts
index 08c03e16..9d46bb70 100644
--- a/src/app/api/agents/[agentId]/permissions/route.ts
+++ b/src/app/api/agents/[agentId]/permissions/route.ts
@@ -3,6 +3,7 @@ import { z } from "zod";
 import { requireAgentOwner, isAuthError } from "@/lib/api/auth-guard";
 import { parseBodyWithLimit } from "@/lib/api/body-limit";
 import { prisma } from "@/lib/prisma";
+import { withOrgContext } from "@/lib/db/rls-middleware";
 import { logger } from "@/lib/logger";
 import { grantPermission } from "@/lib/org-chart/hierarchy";
 
@@ -28,13 +29,21 @@ export async function GET(
   if (isAuthError(authResult)) return authResult;
 
   try {
-    const grants = await prisma.agentPermissionGrant.findMany({
-      where: { granteeAgentId: agentId },
-      orderBy: { createdAt: "desc" },
-      include: {
-        grantor: { select: { id: true, name: true } },
-      },
+    const agent = await prisma.agent.findUnique({
+      where: { id: agentId },
+      select: { organizationId: true },
     });
+    const orgId = agent?.organizationId ?? null;
+
+    const grants = await withOrgContext(prisma, orgId, (tx) =>
+      tx.agentPermissionGrant.findMany({
+        where: { granteeAgentId: agentId },
+        orderBy: { createdAt: "desc" },
+        include: {
+          grantor: { select: { id: true, name: true } },
+        },
+      })
+    );
 
     return NextResponse.json({ success: true, data: grants });
   } catch (error) {
diff --git a/src/lib/org-chart/hierarchy.ts b/src/lib/org-chart/hierarchy.ts
index 73b899d6..ba379398 100644
--- a/src/lib/org-chart/hierarchy.ts
+++ b/src/lib/org-chart/hierarchy.ts
@@ -1,4 +1,6 @@
 import { prisma } from "@/lib/prisma";
+import { withOrgContext } from "@/lib/db/rls-middleware";
+import { withAdminBypass } from "@/lib/api/tenant-context";
 import type { AgentPermissionGrant } from "@/generated/prisma";
 
 export async function getAgentAncestors(agentId: string, maxDepth = 10): Promise<string[]> {
@@ -55,18 +57,20 @@ export async function checkA2APermission(
     ? { OR: [{ scope: null as string | null }, { scope }] }
     : { scope: null as string | null };
 
-  const grant = await prisma.agentPermissionGrant.findFirst({
-    where: {
-      granteeAgentId: agentId,
-      grantorAgentId: { in: ancestors },
-      permission,
-      AND: [
-        scopeCondition,
-        { OR: [{ expiresAt: null }, { expiresAt: { gt: new Date() } }] },
-      ],
-    },
-    select: { grantorAgentId: true },
-  });
+  const grant = await withAdminBypass((db) =>
+    db.agentPermissionGrant.findFirst({
+      where: {
+        granteeAgentId: agentId,
+        grantorAgentId: { in: ancestors },
+        permission,
+        AND: [
+          scopeCondition,
+          { OR: [{ expiresAt: null }, { expiresAt: { gt: new Date() } }] },
+        ],
+      },
+      select: { grantorAgentId: true },
+    })
+  );
 
   if (grant) return { allowed: true, grantedBy: grant.grantorAgentId };
   return { allowed: false };
@@ -86,14 +90,16 @@ export async function grantPermission(
     throw new Error("Grantor must be an ancestor of grantee to delegate permissions");
   }
 
-  return prisma.agentPermissionGrant.create({
-    data: {
-      grantorAgentId,
-      granteeAgentId,
-      organizationId,
-      permission,
-      scope: scope ?? null,
-      expiresAt: expiresAt ?? null,
-    },
-  });
+  return withOrgContext(prisma, organizationId, (tx) =>
+    tx.agentPermissionGrant.create({
+      data: {
+        grantorAgentId,
+        granteeAgentId,
+        organizationId,
+        permission,
+        scope: scope ?? null,
+        expiresAt: expiresAt ?? null,
+      },
+    })
+  );
 }