diff --git a/plugins/ai-psychosis/hooks/scripts/prompt-analyzer.mjs b/plugins/ai-psychosis/hooks/scripts/prompt-analyzer.mjs
index 97bea9b..9d9afab 100644
--- a/plugins/ai-psychosis/hooks/scripts/prompt-analyzer.mjs
+++ b/plugins/ai-psychosis/hooks/scripts/prompt-analyzer.mjs
@@ -137,7 +137,19 @@ state.esc_flags = newEsc;
 state.fatigue_flags = newFat;
 state.val_flags = newVal;
 state.pushback_count = (Number(state.pushback_count) || 0) + pbReactiveHit + pbPreemptiveHit;
-if (domainHit === 1 && !state.domain_context) state.domain_context = 'relationship';
+
+// v1.2: domain_context is always an array. Coerce v1.1.0 string shape on read.
+if (domainHit === 1) {
+  if (typeof state.domain_context === 'string') {
+    state.domain_context = state.domain_context ? [state.domain_context] : [];
+  }
+  if (!Array.isArray(state.domain_context)) {
+    state.domain_context = [];
+  }
+  if (!state.domain_context.includes('relationship')) {
+    state.domain_context.push('relationship');
+  }
+}
 writeState(state);
 
 // Check if any thresholds crossed
diff --git a/plugins/ai-psychosis/hooks/scripts/report-reader.mjs b/plugins/ai-psychosis/hooks/scripts/report-reader.mjs
index b4579bc..83443a1 100644
--- a/plugins/ai-psychosis/hooks/scripts/report-reader.mjs
+++ b/plugins/ai-psychosis/hooks/scripts/report-reader.mjs
@@ -46,9 +46,11 @@ export function aggregateSessions(sessions) {
     total_fatigue += Number(flags.fatigue) || 0;
     total_validation += Number(flags.validation) || 0;
 
+    // v1.2: domain_context is array; v1.0/v1.1: null or string. Coerce on read.
     const dc = rec.domain_context;
-    if (dc === null || dc === undefined) null_domain_count += 1;
-    else if (dc === 'relationship') relationship_domain_count += 1;
+    const domains = Array.isArray(dc) ? dc : (dc ? [dc] : []);
+    if (domains.length === 0) null_domain_count += 1;
+    else if (domains.includes('relationship')) relationship_domain_count += 1;
     else other_domain_count += 1;
   }
 
diff --git a/plugins/ai-psychosis/hooks/scripts/session-end.mjs b/plugins/ai-psychosis/hooks/scripts/session-end.mjs
index 73c78be..cbba605 100644
--- a/plugins/ai-psychosis/hooks/scripts/session-end.mjs
+++ b/plugins/ai-psychosis/hooks/scripts/session-end.mjs
@@ -39,7 +39,11 @@ const escFlags = Number(state.esc_flags) || 0;
 const fatFlags = Number(state.fatigue_flags) || 0;
 const valFlags = Number(state.val_flags) || 0;
 const pushbackCount = Number(state.pushback_count) || 0;
-const domainContext = state.domain_context || null;
+// v1.2: domain_context is always written as array. Coerce v1.1.0 string shape.
+const domainContextRaw = state.domain_context;
+const domainContextArray = Array.isArray(domainContextRaw)
+  ? domainContextRaw
+  : (domainContextRaw ? [domainContextRaw] : []);
 const startIso = state.start_iso || '';
 
 // Compute duration
@@ -56,7 +60,7 @@ appendJsonl(SESSIONS_LOG, {
   duration_min: durationMin,
   tool_count: toolCount,
   edit_count: editCount,
-  domain_context: domainContext,
+  domain_context: domainContextArray,
   flags: {
     dependency: depFlags,
     escalation: escFlags,
diff --git a/plugins/ai-psychosis/tests/interaction-report.test.mjs b/plugins/ai-psychosis/tests/interaction-report.test.mjs
index a5c8615..1770a03 100644
--- a/plugins/ai-psychosis/tests/interaction-report.test.mjs
+++ b/plugins/ai-psychosis/tests/interaction-report.test.mjs
@@ -62,6 +62,29 @@ test('relationship_domain_count matches fixture count', () => {
   assert.equal(result.null_domain_count, 2);
 });
 
+test('v1.2 array domain_context aggregates correctly (relationship in array)', () => {
+  const fixture = [
+    // v1.2 — multi-domain array containing 'relationship'
+    { session_id: 'a', duration_min: 30, domain_context: ['relationship', 'health'],
+      flags: { dependency: 0, escalation: 0, fatigue: 0, validation: 0, pushback: 1 } },
+    // v1.2 — array without 'relationship'
+    { session_id: 'b', duration_min: 30, domain_context: ['legal'],
+      flags: { dependency: 0, escalation: 0, fatigue: 0, validation: 0, pushback: 0 } },
+    // v1.2 — empty array (no domain detected this session)
+    { session_id: 'c', duration_min: 30, domain_context: [],
+      flags: { dependency: 0, escalation: 0, fatigue: 0, validation: 0, pushback: 0 } },
+    // v1.1 — string shape (must still aggregate as relationship)
+    { session_id: 'd', duration_min: 30, domain_context: 'relationship',
+      flags: { dependency: 0, escalation: 0, fatigue: 0, validation: 0, pushback: 1 } },
+  ];
+  const jsonl = fixture.map(o => JSON.stringify(o)).join('\n') + '\n';
+  const result = runReader(jsonl);
+  assert.equal(result.relationship_domain_count, 2,
+    'v1.2 array containing relationship + v1.1 string both increment relationship counter');
+  assert.equal(result.other_domain_count, 1, 'v1.2 ["legal"] is "other" until Step 14 adds per-domain breakdown');
+  assert.equal(result.null_domain_count, 1, 'empty array counts as null');
+});
+
 test('backward-compat: v1.0.0 records without pushback/domain do not produce NaN', () => {
   const fixture = [
     // v1.0.0 — no pushback in flags, no domain_context at top level
diff --git a/plugins/ai-psychosis/tests/prompt-analyzer.test.mjs b/plugins/ai-psychosis/tests/prompt-analyzer.test.mjs
index 0122f35..2d26784 100644
--- a/plugins/ai-psychosis/tests/prompt-analyzer.test.mjs
+++ b/plugins/ai-psychosis/tests/prompt-analyzer.test.mjs
@@ -418,13 +418,14 @@ describe('pushback integration (state accumulation + same-invocation valence)',
     assert.equal(s.fatigue_flags, 1);
   });
 
-  it('sets domain_context to "relationship" on positive match', () => {
+  it('sets domain_context to ["relationship"] on positive match (v1.2 array shape)', () => {
     const s = runPrompt("my partner won't listen to me");
-    assert.equal(s.domain_context, 'relationship');
+    assert.deepEqual(s.domain_context, ['relationship']);
   });
 
   it('keeps domain_context null on technical "function relationship" (false-positive guard)', () => {
     const s = runPrompt('function relationship between input and output');
+    // No domainHit → state.domain_context stays as fresh-state null (untouched).
     assert.equal(s.domain_context, null);
   });
 });
diff --git a/plugins/ai-psychosis/tests/session-end.test.mjs b/plugins/ai-psychosis/tests/session-end.test.mjs
index ed6c110..e48f72a 100644
--- a/plugins/ai-psychosis/tests/session-end.test.mjs
+++ b/plugins/ai-psychosis/tests/session-end.test.mjs
@@ -64,13 +64,13 @@ describe('session-end', () => {
     assert.equal(records[0].note, 'no_state_file');
   });
 
-  it('persists pushback_count and domain_context (v1.1.0)', () => {
+  it('persists pushback_count and coerces v1.1.0 string domain to array', () => {
     dir = setupTestDir();
     createStateFile(dir, 's4', {
       start_epoch: Math.floor(Date.now() / 1000) - 120, start_iso: '2026-01-01T10:00:00Z',
       tool_count: 2, edit_count: 1,
       dep_flags: 0, esc_flags: 0, fatigue_flags: 0, val_flags: 0,
-      pushback_count: 3, domain_context: 'relationship',
+      pushback_count: 3, domain_context: 'relationship', // v1.1.0 string shape
       last_event_epoch: 0, burst_count: 0, last_warning_epoch: 0,
     });
     runHook('session-end.mjs', { session_id: 's4', cwd: '/tmp' }, dir);
@@ -78,7 +78,25 @@ describe('session-end', () => {
     const end = records.find(r => r.end);
     assert.ok(end);
     assert.equal(end.flags.pushback, 3);
-    assert.equal(end.domain_context, 'relationship');
+    // v1.2: end record always carries an array, even when state had a string.
+    assert.deepEqual(end.domain_context, ['relationship']);
+  });
+
+  it('writes v1.2 multi-domain array unchanged when state already has array', () => {
+    dir = setupTestDir();
+    createStateFile(dir, 's4b', {
+      start_epoch: Math.floor(Date.now() / 1000) - 120, start_iso: '2026-01-01T10:00:00Z',
+      tool_count: 2, edit_count: 1,
+      dep_flags: 0, esc_flags: 0, fatigue_flags: 0, val_flags: 0,
+      pushback_count: 1,
+      domain_context: ['relationship', 'health'],
+      last_event_epoch: 0, burst_count: 0, last_warning_epoch: 0,
+    });
+    runHook('session-end.mjs', { session_id: 's4b', cwd: '/tmp' }, dir);
+    const records = readJsonl(join(dir, 'sessions.jsonl'));
+    const end = records.find(r => r.end);
+    assert.ok(end);
+    assert.deepEqual(end.domain_context, ['relationship', 'health']);
   });
 
   it('backward-compat: state without pushback_count yields flags.pushback === 0 (not NaN/undefined)', () => {
@@ -97,6 +115,7 @@ describe('session-end', () => {
     assert.equal(end.flags.pushback, 0);
     assert.notEqual(end.flags.pushback, undefined);
     assert.ok(!Number.isNaN(end.flags.pushback));
-    assert.equal(end.domain_context, null);
+    // v1.2: empty domain becomes [] (not null) — always an array on disk.
+    assert.deepEqual(end.domain_context, []);
   });
 });