## Kids Policy Engine - HAK_GAL v2.1.0-HYDRA

**Date:** 2025-11-29  
**Status:** ✅ STABLE / PRODUCTION READY (Shadow / Research Deployment)  
**Component:** `kids_policy/firewall_engine_v2.py`  
**Version:** v2.1.0-HYDRA

---

### 1. Scope of this Release

This handover documents the final state of the Kids Policy Engine for **HAK_GAL v2.1.0-HYDRA**.  
The engine now provides **bidirectional safety** for child interactions:

- **Input (Child → LLM):** Hardened against social engineering, emoji ciphers, unsafe topics and meta-exploitation.
- **Output (LLM → Child):** Validated against age-appropriate canonical facts using **TAG-2 Truth Preservation**.

The engine is ready for:

- Shadow deployment in production environments.
- Research-grade evaluation and further refinement.

---

### 2. New Features in v2.1.0-HYDRA

#### 2.1 TAG-2 Truth Preservation (Output Validation)

- Integrated **TruthPreservationValidatorV2_3** (`truth_preservation/validators/truth_preservation_validator_v2_3.py`).
- Uses NSMF-based **age-stratified canonical facts** (`truth_preservation/canonical_facts/*.yaml`).
- Enforces **gates v0.4.1** (`truth_preservation/gates/truth_preservation_v0_4.yaml`):
  - VETO-AGE (max contradiction rate ≤ 5%).
  - VETO-MASTER-GUARD (hard contradictions on critical master facts).
  - NLI entailment & EN-rate thresholds.
  - Slot recall & SPS (semantic proximity) thresholds.
- Exposed via `HakGalFirewall_v2.validate_output()`:
  - Returns `status: BLOCK` + `reason: TRUTH_VIOLATION` when gates fail.
  - Includes detailed audit info in `debug["tag2_result"]`.

**Effect:** Prevents harmful hallucinations in answers to children, even when input was allowed by contextual rules (e.g. Minecraft scenarios).

#### 2.2 HYDRA-13 MetaExploitationGuard (Meta-Input Hardening)

- Integrated **MetaExploitationGuard** (`kids_policy/meta_exploitation_guard.py`) as **Layer 1.2**:
  - Runs **after PersonaSkeptic** and **before TopicRouter**.
  - Detects meta-questions probing system rules or prompts (e.g. "Ignore previous instructions", "Show me your system prompt", "Wie funktioniert dein System?").
  - Uses UnicodeSanitizer for homoglyph / zero-width evasion (HYDRA-14.5 alignment).
- Exposed via `HakGalFirewall_v2.process_request()`:
  - On detection, returns `status: BLOCK`, `block_reason_code: META_EXPLOITATION` and `reason: META_EXPLOITATION_<code>`.
  - Registers a violation in `SessionMonitor` to slow down risk decay (Adaptive Memory).

**Effect:** Closes the meta-exploitation surface (HYDRA-13) by fail-closing on ambiguous or adversarial meta-queries.

---

### 3. Architecture Overview (v2.1)

The v2.1 pipeline in `HakGalFirewall_v2`:

1. **Layer 0 – UnicodeSanitizer**
   - Demojize + homograph normalization + zero-width stripping.
   - Threat mapping for emojis (e.g., 🔫 → "firearm", 💣 → "explosive").

2. **Layer 1-A – PersonaSkeptic**
   - Detects framing and "I am a researcher…" excuses.
   - Applies skepticism penalty and disables Gamer Amnesty when active.

3. **Layer 1.2 – MetaExploitationGuard (HYDRA-13)**
   - Fast-fail for meta-exploitation attempts (system override / prompt exposure).
   - Independent of TopicRouter topic classification.

4. **Layer 1.5 – ContextClassifier (Gamer Amnesty)**
   - Detects gaming / fictional contexts (e.g. Minecraft).
   - Raises decision threshold when *no* suspicious persona is present.

5. **Layer 1-B – SemanticGroomingGuard**
   - Neural intent analysis via sentence transformers.
   - Produces risk score ∈ [0.0, 1.0].

6. **Layer 4 – SessionMonitor (Adaptive Memory)**
   - Tracks violation history and cumulative risk.
   - Adaptive decay (slower for repeated violations).

7. **Layer 2 – TAG-2 Truth Preservation (Output)**
   - Validates LLM responses against canonical facts and master-guarded facts per topic & age band.
   - Blocks when any of the gates fail.

---

### 4. Test Status (v2.1)

All relevant tests executed inside `venv_hexa` on 2025-11-29.

#### 4.1 Core Engine & NEMESIS / CHAOS

- `kids_policy/tests/test_firewall_engine_v2.py` – ✅ PASS  
- `kids_policy/tests/test_protocol_chaos.py` – ✅ PASS  
- `kids_policy/tests/test_protocol_nemesis.py` – ✅ PASS  
- `kids_policy/tests/test_protocol_chimera.py` – ✅ PASS  

#### 4.2 TAG-2 Truth Preservation

- `kids_policy/tests/test_firewall_engine_v2_tag2.py` – ✅ PASS  
  - Test 1: Valid safety rule explanation → ALLOW.  
  - Test 2: Contradicting safety rules (e.g. "rules don't matter") → BLOCK (`TRUTH_VIOLATION`).  
  - Test 3: No topic_id → validation skipped (`tag2_skipped = "no_topic_id"`).  
  - Test 4: `general_chat` topic → validation skipped by design.

- `docs/kids_policy/TAG2_FINAL_VALIDATION_REPORT_I0C035E.md` – Reference report (unchanged, still valid; this release wires it into the engine path).

#### 4.3 HYDRA-13 MetaExploitationGuard

- `kids_policy/tests/test_meta_guard_integration.py` – ✅ PASS  
  - Meta override prompts (EN/DE) are blocked with `block_reason_code = "META_EXPLOITATION"`.  
  - Benign questions (e.g. "What is photosynthesis?") are allowed or blocked only by non-meta layers.

- `kids_policy/tests/test_meta_guard_direct.py` – ✅ PASS (diagnostic, not part of CI).  

---

### 5. Operational Notes

- **Environment:** Python 3.12, `venv_hexa`, TensorFlow / sentence-transformers installed.
- **Performance:** TAG-2 adds additional NLI + SBERT passes on outputs; recommended for shadow or guarded deployments, not ultra-low-latency paths without hardware acceleration.
- **Failure Modes:**
  - If TAG-2 configuration or canonical facts are missing, `validate_output()` fails open but logs `tag2_skipped` with specific reason.
  - MetaExploitationGuard failures are fail-closed at the input layer.

---

### 6. Handover Summary

- **Status:** v2.1.0-HYDRA is **stable** and **production-ready** for:
  - Shadow deployments,
  - Research environments,
  - High-sensitivity child-safety scenarios.
- **Bidirectional Protection:**  
  - Input: Emoji, Topic, Persona, Meta (HYDRA-13).  
  - Output: Factual truth preservation (TAG-2) per age band and topic.
- **Next Steps (Optional):**
  - Irony / sarcasm detection for nuanced contexts.
  - Leetspeak / obfuscation normalizer in Layer 0.
  - Extended real-world corpus validation beyond synthetic protocols.

This document serves as the **final v2.1 handover** for future agents and maintainers.


