diff --git a/backend/tests/test_admin_ai_config.py b/backend/tests/test_admin_ai_config.py
new file mode 100644
index 0000000..2a99647
--- /dev/null
+++ b/backend/tests/test_admin_ai_config.py
@@ -0,0 +1,25 @@
+"""
+Wave 0 xfail stubs for Phase 7 admin AI config endpoint tests.
+
+Covers:
+  - T-07-01: GET /api/admin/ai-config never returns api_key_enc (D-05/D-08)
+  - D-08: PUT /api/admin/ai-config writes active provider (admin AI Providers panel)
+
+Each function is a placeholder to be promoted in Plan 07-05 once the admin
+AI config endpoints exist.
+
+Stub policy (STATE.md decision: xfail(strict=False) for Wave 0):
+  - Body is a single pytest.xfail() call — no assertion code.
+  - strict=False so unexpected passes (xpass) never break CI.
+"""
+import pytest
+
+
+@pytest.mark.xfail(strict=False, reason="Wave 0 stub — promoted in Plan 07-05")
+async def test_get_never_returns_key():
+    pytest.xfail("not implemented yet — Plan 07-05")
+
+
+@pytest.mark.xfail(strict=False, reason="Wave 0 stub — promoted in Plan 07-05")
+async def test_put_writes_active_provider():
+    pytest.xfail("not implemented yet — Plan 07-05")
diff --git a/backend/tests/test_ai_config.py b/backend/tests/test_ai_config.py
new file mode 100644
index 0000000..819a64e
--- /dev/null
+++ b/backend/tests/test_ai_config.py
@@ -0,0 +1,25 @@
+"""
+Wave 0 xfail stubs for Phase 7 AI config service tests.
+
+Covers:
+  - D-04: load_provider_config() reads from system_settings table
+  - D-05: API key HKDF encryption round-trip
+
+Each function is a placeholder to be promoted in Plan 07-01 (green gate) once
+the services/ai_config.py module and system_settings table exist.
+
+Stub policy (STATE.md decision: xfail(strict=False) for Wave 0):
+  - Body is a single pytest.xfail() call — no assertion code.
+  - strict=False so unexpected passes (xpass) never break CI.
+"""
+import pytest
+
+
+@pytest.mark.xfail(strict=False, reason="Wave 0 stub — promoted in Plan 07-01")
+async def test_load_provider_config():
+    pytest.xfail("not implemented yet — Plan 07-01")
+
+
+@pytest.mark.xfail(strict=False, reason="Wave 0 stub — promoted in Plan 07-01")
+async def test_api_key_encrypt_decrypt():
+    pytest.xfail("not implemented yet — Plan 07-01")
diff --git a/backend/tests/test_ai_providers.py b/backend/tests/test_ai_providers.py
new file mode 100644
index 0000000..9775c2a
--- /dev/null
+++ b/backend/tests/test_ai_providers.py
@@ -0,0 +1,46 @@
+"""
+Wave 0 xfail stubs for Phase 7 AI provider tests.
+
+Each function is a placeholder for a test that will be promoted to green
+in a later plan wave (per 07-VALIDATION.md per-task-verification map).
+
+Stub policy (STATE.md decision: xfail(strict=False) for Wave 0):
+  - Body is a single pytest.xfail() call — no assertion code.
+  - strict=False so unexpected passes (xpass) never break CI.
+"""
+import pytest
+
+
+@pytest.mark.xfail(strict=False, reason="Wave 0 stub — promoted in Plan 07-02")
+async def test_generic_openai_json_mode():
+    pytest.xfail("not implemented yet — Plan 07-02")
+
+
+@pytest.mark.xfail(strict=False, reason="Wave 0 stub — promoted in Plan 07-03")
+async def test_anthropic_structured_output():
+    pytest.xfail("not implemented yet — Plan 07-03")
+
+
+@pytest.mark.xfail(strict=False, reason="Wave 0 stub — promoted in Plan 07-02")
+async def test_get_provider_typed():
+    pytest.xfail("not implemented yet — Plan 07-02")
+
+
+@pytest.mark.xfail(strict=False, reason="Wave 0 stub — promoted in Plan 07-02")
+async def test_client_singleton():
+    pytest.xfail("not implemented yet — Plan 07-02")
+
+
+@pytest.mark.xfail(strict=False, reason="Wave 0 stub — promoted in Plan 07-03")
+async def test_context_chars_truncation():
+    pytest.xfail("not implemented yet — Plan 07-03")
+
+
+@pytest.mark.xfail(strict=False, reason="Wave 0 stub — promoted in Plan 07-03")
+async def test_smart_truncation():
+    pytest.xfail("not implemented yet — Plan 07-03")
+
+
+@pytest.mark.xfail(strict=False, reason="Wave 0 stub — promoted in Plan 07-02 Task 4 (D-02 Gemini fallback path)")
+async def test_gemini_fallback_to_parse_classification():
+    pytest.xfail("not implemented yet — Plan 07-02")
diff --git a/backend/tests/test_document_tasks.py b/backend/tests/test_document_tasks.py
new file mode 100644
index 0000000..3b5d632
--- /dev/null
+++ b/backend/tests/test_document_tasks.py
@@ -0,0 +1,25 @@
+"""
+Wave 0 xfail stubs for Phase 7 Celery document task tests.
+
+Covers:
+  - D-09: Celery retry with 30s/90s/270s exponential backoff
+  - D-10: After 3 retries doc.status = "classification_failed"
+
+Each function is a placeholder to be promoted in Plan 07-04 once the
+bind=True retry harness is implemented in document_tasks.py.
+
+Stub policy (STATE.md decision: xfail(strict=False) for Wave 0):
+  - Body is a single pytest.xfail() call — no assertion code.
+  - strict=False so unexpected passes (xpass) never break CI.
+"""
+import pytest
+
+
+@pytest.mark.xfail(strict=False, reason="Wave 0 stub — promoted in Plan 07-04")
+async def test_retry_backoff():
+    pytest.xfail("not implemented yet — Plan 07-04")
+
+
+@pytest.mark.xfail(strict=False, reason="Wave 0 stub — promoted in Plan 07-04")
+async def test_exhaustion_sets_failed_status():
+    pytest.xfail("not implemented yet — Plan 07-04")
diff --git a/backend/tests/test_documents.py b/backend/tests/test_documents.py
index 57c891a..6a76fee 100644
--- a/backend/tests/test_documents.py
+++ b/backend/tests/test_documents.py
@@ -923,3 +923,13 @@ async def test_delete_cloud_remove_only(async_client, auth_user, db_session):
     # DB row removed
     deleted = await db_session.get(Document, doc_id)
     assert deleted is None
+
+
+# ---------------------------------------------------------------------------
+# Phase 7 Wave 0 xfail stub — D-11 re-classify endpoint
+# ---------------------------------------------------------------------------
+
+
+@pytest.mark.xfail(strict=False, reason="Wave 0 stub — promoted in Plan 07-04")
+async def test_reclassify_requeues_celery():
+    pytest.xfail("not implemented yet — Plan 07-04")