diff --git a/docs/prompt-architecture-improvement-plan.md b/docs/prompt-architecture-improvement-plan.md
index cdbcc81..305f372 100644
--- a/docs/prompt-architecture-improvement-plan.md
+++ b/docs/prompt-architecture-improvement-plan.md
@@ -209,7 +209,8 @@ Improve later:
 Near-term:
 
 - Add final row hygiene already done through `prompt_hygiene.py`.
-- Add a metadata invariant checker for rows before return.
+- Add a metadata smoke checker for representative rows through
+  `tools/prompt_smoke.py`.
 - Normalize every row with one function before JSON serialization.
 
 Medium-term:
@@ -224,6 +225,8 @@ Near-term:
 - Normalize pair metadata with one helper.
 - Confirm pair prompts, captions, and soft/hard rows carry the same sanitized
   scene/camera/clothing fields.
+- Keep same-room pair continuity synchronized in both assembled prompt text and
+  `hardcore_row.scene_text`; `tools/prompt_smoke.py` covers this drift case.
 
 Medium-term:
 
@@ -236,8 +239,10 @@ Medium-term:
 Near-term:
 
 - Add final prose hygiene already done through `prompt_hygiene.py`.
-- Add tests for close foreplay, POV oral, POV penetration, aftercare, manual
-  stimulation, and camera-scene preservation.
+- Add smoke coverage through `tools/prompt_smoke.py` for metadata-driven Krea2
+  formatting across built-in rows, hardcore rows, same-cast pairs, and POV
+  pairs. Expand it next for close foreplay, POV penetration, and camera-scene
+  preservation.
 
 Medium-term:
 
@@ -249,7 +254,8 @@ Medium-term:
 Near-term:
 
 - Add final tag hygiene already done through `prompt_hygiene.py`.
-- Add smoke tests for trigger preservation and duplicate tag removal.
+- Add smoke tests for trigger preservation and duplicate tag removal through
+  `tools/prompt_smoke.py`.
 
 Medium-term:
 
@@ -260,7 +266,8 @@ Medium-term:
 Near-term:
 
 - Add final prose hygiene already done through `prompt_hygiene.py`.
-- Verify training captions keep trigger exactly once.
+- Verify training captions keep trigger exactly once through
+  `tools/prompt_smoke.py`.
 
 Medium-term:
 
@@ -293,7 +300,8 @@ Medium-term:
 
 ## Recommended Next Passes
 
-1. Add metadata invariant checks and small smoke fixtures.
+1. Expand `tools/prompt_smoke.py` with camera-scene, explicit nude, and
+   different-camera pair fixtures.
 2. Split Krea action/POV/clothing helpers into separate modules.
 3. Add category JSON pool reference validation to `tools/prompt_map_audit.py`.
 4. Extract scene-camera adapters from `prompt_builder.py`.
diff --git a/docs/prompt-pool-routing-map.md b/docs/prompt-pool-routing-map.md
index af7dbc1..67d5245 100644
--- a/docs/prompt-pool-routing-map.md
+++ b/docs/prompt-pool-routing-map.md
@@ -655,6 +655,28 @@ The script does not import ComfyUI. It parses the repo and prints:
 Use its output to spot doc drift after adding a new node or pool. If a new node
 or pool appears there but not in this map, update the relevant route table.
 
+## Behavioral Smoke Helper
+
+Route behavior should be checked when changing prompt generation, pair assembly,
+formatter metadata parsing, trigger handling, expression disabling, or scene
+continuity. Run:
+
+```bash
+python tools/prompt_smoke.py
+```
+
+The script does not import ComfyUI. It builds representative metadata rows and
+pair metadata through the core Python APIs, then verifies:
+
+- generated rows keep prompt, negative prompt, scene, composition, action item,
+  and role graph metadata populated;
+- Krea2, SDXL, and natural caption routes use metadata instead of text fallback;
+- SDXL and caption trigger handling keeps one trigger;
+- negative prompts do not duplicate comma-list items;
+- same-room Insta/OF continuity keeps prompt text and `hardcore_row.scene_text`
+  synchronized;
+- expression-disabled rows do not fall back to generated expression text.
+
 ## Editing Cheatsheet
 
 | Symptom | First file/function to inspect |
diff --git a/prompt_builder.py b/prompt_builder.py
index 60a99d6..87747e0 100644
--- a/prompt_builder.py
+++ b/prompt_builder.py
@@ -8661,6 +8661,9 @@ def build_insta_of_pair(
     soft_row = _apply_coworking_composition(soft_row, soft_subject_kind)
     hard_row = _apply_coworking_composition(hard_row, hard_subject_kind)
     hard_scene = soft_row["scene_text"] if options["continuity"] == "same_creator_same_room" else hard_row["scene_text"]
+    if hard_scene != hard_row.get("scene_text"):
+        hard_row["source_scene_text"] = hard_row.get("source_scene_text") or hard_row.get("scene_text", "")
+        hard_row["scene_text"] = hard_scene
     hard_composition = _coworking_composition_prompt(hard_scene, hard_row["composition"], hard_subject_kind)
     if hard_composition != hard_row["composition"]:
         hard_row["source_composition"] = hard_row.get("source_composition") or hard_row["composition"]
@@ -8758,7 +8761,7 @@ def build_insta_of_pair(
     if "body is fully exposed" in hard_clothing_state.lower() or "bare skin unobstructed" in hard_clothing_state.lower():
         hard_scene = _body_exposure_scene_text(hard_scene)
         hard_row["source_scene_text"] = hard_row.get("source_scene_text") or hard_row.get("scene_text", "")
-        hard_row["scene_text"] = _body_exposure_scene_text(hard_row.get("scene_text", ""))
+        hard_row["scene_text"] = hard_scene
     hard_detail_density = options["hardcore_detail_density"]
     hard_detail_directive = {
         "compact": "Use one compact position-first sexual action sentence; avoid repeated aftermath wording. ",
diff --git a/tools/prompt_smoke.py b/tools/prompt_smoke.py
new file mode 100644
index 0000000..e6703e4
--- /dev/null
+++ b/tools/prompt_smoke.py
@@ -0,0 +1,395 @@
+#!/usr/bin/env python3
+"""Smoke-test core prompt routes without importing ComfyUI.
+
+The checks here are intentionally lightweight invariants, not golden prompt
+snapshots. They prove that representative rows still carry structured metadata
+and that the Krea2, SDXL, and caption formatter paths consume metadata instead
+of silently falling back to raw text parsing.
+"""
+
+from __future__ import annotations
+
+import argparse
+import json
+import re
+import sys
+from dataclasses import dataclass, field
+from pathlib import Path
+from typing import Any, Callable
+
+
+ROOT = Path(__file__).resolve().parents[1]
+if str(ROOT) not in sys.path:
+    sys.path.insert(0, str(ROOT))
+
+import caption_naturalizer  # noqa: E402
+import krea_formatter  # noqa: E402
+import prompt_builder as pb  # noqa: E402
+import sdxl_formatter  # noqa: E402
+
+
+Trigger = "sxcppnl7"
+SdxlTrigger = "mythp0rt"
+
+
+@dataclass
+class SmokeReport:
+    passed: list[str] = field(default_factory=list)
+    failed: list[str] = field(default_factory=list)
+
+    def ok(self, name: str) -> None:
+        self.passed.append(name)
+        print(f"PASS {name}")
+
+    def fail(self, name: str, message: str) -> None:
+        detail = f"{name}: {message}"
+        self.failed.append(detail)
+        print(f"FAIL {detail}")
+
+
+def _clean_key(value: str) -> str:
+    return re.sub(r"[^a-z0-9]+", " ", str(value or "").lower()).strip()
+
+
+def _json(value: Any) -> str:
+    return json.dumps(value, ensure_ascii=True, sort_keys=True)
+
+
+def _expect(condition: bool, message: str) -> None:
+    if not condition:
+        raise AssertionError(message)
+
+
+def _expect_text(name: str, value: Any, min_len: int = 8) -> str:
+    text = str(value or "").strip()
+    _expect(len(text) >= min_len, f"{name} is empty or too short")
+    _expect("None" not in text, f"{name} leaked None")
+    _expect("  " not in text, f"{name} has repeated spaces")
+    _expect(" ," not in text and " ." not in text, f"{name} has bad punctuation spacing")
+    return text
+
+
+def _expect_no_duplicate_comma_items(name: str, value: Any) -> None:
+    items = [_clean_key(part) for part in str(value or "").split(",")]
+    items = [part for part in items if part]
+    duplicates = sorted({part for part in items if items.count(part) > 1})
+    _expect(not duplicates, f"{name} has duplicate comma items: {duplicates[:5]}")
+
+
+def _trigger_count(text: str, trigger: str) -> int:
+    return len(re.findall(rf"(?<![a-z0-9_]){re.escape(trigger)}(?![a-z0-9_])", text, flags=re.IGNORECASE))
+
+
+def _expect_trigger_once(name: str, value: Any, trigger: str) -> None:
+    text = str(value or "")
+    count = _trigger_count(text, trigger)
+    _expect(count == 1, f"{name} should contain trigger {trigger!r} exactly once, got {count}")
+
+
+def _expect_row_base(row: dict[str, Any], name: str) -> None:
+    _expect(isinstance(row, dict), f"{name} did not return a metadata row")
+    _expect_text(f"{name}.prompt", row.get("prompt"), 20)
+    _expect_text(f"{name}.negative_prompt", row.get("negative_prompt"), 8)
+    _expect_no_duplicate_comma_items(f"{name}.negative_prompt", row.get("negative_prompt"))
+    _expect(json.loads(_json(row)) == row, f"{name} is not JSON-stable")
+
+
+def _expect_custom_row(row: dict[str, Any], name: str) -> None:
+    _expect_row_base(row, name)
+    _expect(row.get("source") == "json_category", f"{name}.source should be json_category")
+    _expect_text(f"{name}.item", row.get("item"), 8)
+    _expect_text(f"{name}.scene_text", row.get("scene_text"), 8)
+    _expect_text(f"{name}.composition", row.get("composition"), 8)
+    _expect_text(f"{name}.role_graph", row.get("source_role_graph") or row.get("role_graph"), 8)
+    _expect(isinstance(row.get("item_axis_values"), dict), f"{name}.item_axis_values missing")
+
+
+def _expect_formatter_outputs(row: dict[str, Any], name: str, *, target: str = "auto") -> None:
+    metadata = _json(row)
+    krea = krea_formatter.format_krea2_prompt("", metadata_json=metadata, target=target)
+    _expect("metadata" in krea.get("method", ""), f"{name}.krea did not use metadata: {krea.get('method')}")
+    _expect_text(f"{name}.krea_prompt", krea.get("krea_prompt"), 20)
+    _expect_no_duplicate_comma_items(f"{name}.krea_negative", krea.get("negative_prompt"))
+
+    sdxl = sdxl_formatter.format_sdxl_prompt(
+        "",
+        metadata_json=metadata,
+        target=target,
+        trigger=SdxlTrigger,
+        prepend_trigger=True,
+    )
+    _expect("metadata" in sdxl.get("method", ""), f"{name}.sdxl did not use metadata: {sdxl.get('method')}")
+    _expect_text(f"{name}.sdxl_prompt", sdxl.get("sdxl_prompt"), 20)
+    _expect_trigger_once(f"{name}.sdxl_prompt", sdxl.get("sdxl_prompt"), SdxlTrigger)
+    _expect_no_duplicate_comma_items(f"{name}.sdxl_negative", sdxl.get("negative_prompt"))
+
+    caption, method = caption_naturalizer.naturalize_caption(
+        "",
+        metadata_json=metadata,
+        trigger=Trigger,
+        include_trigger=True,
+    )
+    _expect("metadata" in method, f"{name}.caption did not use metadata: {method}")
+    _expect_text(f"{name}.caption", caption, 20)
+    _expect_trigger_once(f"{name}.caption", caption, Trigger)
+
+
+def _character_cast(*, pov_man: bool = False) -> str:
+    cast = pb.build_character_slot_json(
+        subject_type="woman",
+        label="A",
+        age="25-year-old adult",
+        ethnicity="western_european",
+        figure="balanced",
+        body="slim",
+        descriptor_detail="full",
+        expression_intensity=0.65,
+        softcore_expression_intensity=0.45,
+        hardcore_expression_intensity=0.85,
+    )["character_cast"]
+    return pb.build_character_slot_json(
+        subject_type="man",
+        label="A",
+        age="40-year-old adult",
+        ethnicity="western_european",
+        figure="balanced",
+        body="average",
+        descriptor_detail="compact",
+        expression_intensity=0.55,
+        softcore_expression_intensity=0.35,
+        hardcore_expression_intensity=0.75,
+        presence_mode="pov" if pov_man else "visible",
+        character_cast=cast,
+    )["character_cast"]
+
+
+def _action_filter(focus: str) -> str:
+    kwargs = {
+        "allow_toys": False,
+        "allow_double": False,
+        "allow_penetration": focus in ("penetration_only", "keep_pool"),
+        "allow_foreplay": focus in ("foreplay_only", "keep_pool"),
+        "allow_interaction": focus in ("interaction_only", "keep_pool"),
+        "allow_manual": focus in ("manual_only", "keep_pool"),
+        "allow_oral": focus in ("oral_only", "keep_pool"),
+        "allow_outercourse": focus in ("outercourse_only", "keep_pool"),
+        "allow_anal": focus in ("anal_only", "keep_pool"),
+        "allow_climax": focus in ("climax_only", "keep_pool"),
+    }
+    return pb.build_hardcore_action_filter_json(focus=focus, **kwargs)
+
+
+def _prompt_row(
+    *,
+    name: str,
+    category: str,
+    subcategory: str,
+    seed: int,
+    character_cast: str = "",
+    women_count: int = 1,
+    men_count: int = 1,
+    hardcore_position_config: str = "",
+) -> dict[str, Any]:
+    row = pb.build_prompt(
+        category=category,
+        subcategory=subcategory,
+        row_number=1,
+        start_index=1,
+        seed=seed,
+        clothing="random",
+        ethnicity="any",
+        poses="random",
+        backside_bias=0.35,
+        figure="random",
+        no_plus_women=False,
+        no_black=False,
+        minimal_clothing_ratio=0.5,
+        standard_pose_ratio=0.5,
+        trigger=Trigger,
+        prepend_trigger_to_prompt=True,
+        extra_positive="",
+        extra_negative="",
+        character_cast=character_cast,
+        women_count=women_count,
+        men_count=men_count,
+        expression_enabled=True,
+        expression_intensity=0.6,
+        hardcore_position_config=hardcore_position_config,
+    )
+    _expect_row_base(row, name)
+    return row
+
+
+def smoke_builtin_single() -> None:
+    row = _prompt_row(name="builtin_single_woman", category="woman", subcategory="random", seed=1001, men_count=0)
+    _expect(row.get("source") == "built_in_generator", "builtin row should come from built-in generator")
+    _expect_trigger_once("builtin_single_woman.prompt", row.get("prompt"), Trigger)
+    _expect_formatter_outputs(row, "builtin_single_woman", target="single")
+
+
+def smoke_hardcore_category_routes() -> None:
+    cast = _character_cast()
+    cases = [
+        ("hardcore_penetration", "Penetrative sex", "penetration_only"),
+        ("hardcore_oral", "Oral sex", "oral_only"),
+        ("hardcore_manual", "Manual stimulation", "manual_only"),
+        ("hardcore_outercourse", "Outercourse and genital teasing", "outercourse_only"),
+        ("hardcore_foreplay", "Foreplay and teasing", "foreplay_only"),
+        ("hardcore_aftercare", "Aftercare and cleanup", "interaction_only"),
+    ]
+    for index, (name, subcategory, focus) in enumerate(cases, start=1101):
+        row = _prompt_row(
+            name=name,
+            category="Hardcore sexual poses",
+            subcategory=subcategory,
+            seed=index,
+            character_cast=cast,
+            women_count=1,
+            men_count=1,
+            hardcore_position_config=_action_filter(focus),
+        )
+        _expect_custom_row(row, name)
+        _expect(row.get("subject_type") == "configured_cast", f"{name} should use configured cast")
+        _expect_formatter_outputs(row, name, target="single")
+
+
+def _insta_options(**overrides: Any) -> str:
+    options = pb.build_insta_of_options_json(
+        softcore_cast="same_as_hardcore",
+        hardcore_cast="couple",
+        hardcore_women_count=1,
+        hardcore_men_count=1,
+        softcore_level="lingerie_tease",
+        hardcore_level="hardcore",
+        platform_style="hybrid",
+        continuity="same_creator_same_room",
+        hardcore_clothing_continuity="explicit_nude",
+        softcore_camera_mode="standard",
+        hardcore_camera_mode="standard",
+        camera_detail="compact",
+        hardcore_detail_density="balanced",
+    )
+    data = json.loads(options)
+    data.update(overrides)
+    return _json(data)
+
+
+def _expect_pair(pair: dict[str, Any], name: str) -> None:
+    _expect(pair.get("mode") == "Insta/OF", f"{name}.mode should be Insta/OF")
+    _expect_row_base(pair.get("softcore_row") or {}, f"{name}.softcore_row")
+    _expect_custom_row(pair.get("hardcore_row") or {}, f"{name}.hardcore_row")
+    _expect_text(f"{name}.softcore_prompt", pair.get("softcore_prompt"), 20)
+    _expect_text(f"{name}.hardcore_prompt", pair.get("hardcore_prompt"), 20)
+    _expect_no_duplicate_comma_items(f"{name}.softcore_negative", pair.get("softcore_negative_prompt"))
+    _expect_no_duplicate_comma_items(f"{name}.hardcore_negative", pair.get("hardcore_negative_prompt"))
+    _expect_formatter_outputs(pair, name, target="softcore")
+    _expect_formatter_outputs(pair, f"{name}.hardcore", target="hardcore")
+
+
+def smoke_insta_pair() -> None:
+    pair = pb.build_insta_of_pair(
+        row_number=1,
+        start_index=1,
+        seed=2101,
+        ethnicity="any",
+        figure="random",
+        no_plus_women=False,
+        no_black=False,
+        trigger=Trigger,
+        prepend_trigger_to_prompt=True,
+        options_json=_insta_options(),
+        character_cast=_character_cast(),
+        hardcore_position_config=_action_filter("penetration_only"),
+    )
+    _expect_pair(pair, "insta_pair_same_cast")
+    _expect(pair["softcore_row"].get("scene_text") == pair["hardcore_row"].get("scene_text"), "pair scene continuity broke")
+
+
+def smoke_insta_pair_pov() -> None:
+    pair = pb.build_insta_of_pair(
+        row_number=1,
+        start_index=1,
+        seed=2201,
+        ethnicity="any",
+        figure="random",
+        no_plus_women=False,
+        no_black=False,
+        trigger=Trigger,
+        prepend_trigger_to_prompt=True,
+        options_json=_insta_options(),
+        character_cast=_character_cast(pov_man=True),
+        hardcore_position_config=_action_filter("oral_only"),
+    )
+    _expect_pair(pair, "insta_pair_pov_man")
+    pov_labels = pair.get("pov_character_labels") or []
+    _expect("Man A" in pov_labels, "pair POV labels should include Man A")
+    hard_row = pair.get("hardcore_row") or {}
+    _expect("Man A" in (hard_row.get("pov_character_labels") or []), "hard row POV labels should include Man A")
+    krea = krea_formatter.format_krea2_prompt("", metadata_json=_json(pair), target="hardcore")
+    prompt = krea.get("krea_prompt") or ""
+    _expect("viewer" in prompt.lower(), "POV Krea prompt should mention viewer perspective")
+
+
+def smoke_no_expression_fallback() -> None:
+    cast = pb.build_character_slot_json(
+        subject_type="woman",
+        label="A",
+        age="25-year-old adult",
+        ethnicity="western_european",
+        body="slim",
+        descriptor_detail="full",
+        expression_enabled=False,
+    )["character_cast"]
+    row = _prompt_row(
+        name="hardcore_expression_disabled",
+        category="Hardcore sexual poses",
+        subcategory="Penetrative sex",
+        seed=2301,
+        character_cast=cast,
+        women_count=1,
+        men_count=1,
+        hardcore_position_config=_action_filter("penetration_only"),
+    )
+    _expect_custom_row(row, "hardcore_expression_disabled")
+    _expect(not row.get("expression"), "expression should stay disabled without fallback")
+    _expect("Facial expressions:" not in row.get("prompt", ""), "disabled expression leaked into prompt")
+    _expect_formatter_outputs(row, "hardcore_expression_disabled", target="single")
+
+
+SMOKE_CASES: list[tuple[str, Callable[[], None]]] = [
+    ("builtin_single_woman", smoke_builtin_single),
+    ("hardcore_category_routes", smoke_hardcore_category_routes),
+    ("insta_pair_same_cast", smoke_insta_pair),
+    ("insta_pair_pov_man", smoke_insta_pair_pov),
+    ("expression_disabled", smoke_no_expression_fallback),
+]
+
+
+def main(argv: list[str] | None = None) -> int:
+    parser = argparse.ArgumentParser(description=__doc__)
+    parser.add_argument(
+        "--case",
+        choices=[name for name, _func in SMOKE_CASES],
+        action="append",
+        help="Run only the named smoke case. Can be passed multiple times.",
+    )
+    args = parser.parse_args(argv)
+    selected = set(args.case or [])
+    report = SmokeReport()
+    for name, func in SMOKE_CASES:
+        if selected and name not in selected:
+            continue
+        try:
+            func()
+        except Exception as exc:  # noqa: BLE001 - report all smoke failures uniformly.
+            report.fail(name, str(exc))
+        else:
+            report.ok(name)
+    print(f"\nSummary: {len(report.passed)} passed, {len(report.failed)} failed")
+    if report.failed:
+        return 1
+    return 0
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())