# Technical Report: HAK_GAL v2.1.0-HYDRA & Protocol HEPHAESTUS Implementation
**Date:** 2025-11-29
**Project:** HAK_GAL_HEXAGONAL / llm-security-firewall
**Status:** Implementation Complete, Tests Passing

---

## Executive Summary

This report documents the implementation of HAK_GAL v2.1.0-HYDRA release for the Kids Policy Engine and the initial implementation of Protocol HEPHAESTUS (Tool Security) components. All changes have been tested, committed, and pushed to the GitHub repository.

**Key Deliverables:**
- Kids Policy Engine v2.1.0-HYDRA (TAG-2 Truth Preservation + HYDRA-13 MetaExploitationGuard)
- Core Firewall v2 Architecture Analysis & Recommendations
- Protocol HEPHAESTUS: ToolCallValidator (450+ lines, 11 tests)
- Protocol HEPHAESTUS: ToolCallExtractor (370+ lines, 17 tests)
- CI Test Fix for operator_budget_exceeded (Python 3.12)

---

## 1. HAK_GAL v2.1.0-HYDRA Release

### 1.1 Implementation

**File:** `kids_policy/firewall_engine_v2.py`

**Changes:**
- Integrated `MetaExploitationGuard` (HYDRA-13) as Fast-Fail layer after `PersonaSkeptic` and before `TopicRouter`
- Fully implemented `validate_output()` method for TAG-2 Truth Preservation
- Added dynamic configuration loading (`_load_gates_config`, `_load_canonical_facts`) based on `topic_id` and `age_band`

**Pipeline Order:**
1. Layer 0: UnicodeSanitizer
2. Layer 1-A: PersonaSkeptic
3. Layer 1.2: MetaExploitationGuard (HYDRA-13) - **NEW**
4. Layer 1.5: TopicRouter + ContextClassifier
5. Layer 1-B: SemanticGroomingGuard
6. Layer 4: SessionMonitor
7. Layer 2: TruthPreservationValidator (TAG-2) - **ENHANCED**

### 1.2 Test Coverage

**Files:**
- `kids_policy/tests/test_firewall_engine_v2_tag2.py` (TAG-2 tests)
- `kids_policy/tests/test_meta_guard_integration.py` (HYDRA-13 tests)

**Results:**
- All tests passing
- Validates: valid output passing, invalid output blocking, skip paths for no topic_id/general_chat
- Meta-exploitation attempts (EN/DE) correctly blocked with `META_EXPLOITATION_*` reason codes

### 1.3 Documentation Updates

**Files Modified:**
- `kids_policy/README.md` - Updated to v2.1.0-HYDRA, added Layer 1.2 and Layer 2 descriptions
- `README.md` (root) - Added "Recent Updates" section in Development, maintains v1.0.0-GOLD status
- `docs/kids_policy/HANDOVER_v2.1_FINAL_2025_11_29.md` - Release handover document

**Commits:**
- `a13abe1` - feat(release): HAK_GAL v2.1.0-HYDRA (Bidirectional Safety)
- `e644715` - docs: Add v2.1-HYDRA release notes to Development section

---

## 2. Core Firewall v2 Architecture Analysis

### 2.1 Diagnosis

**File:** `docs/CORE_FIREWALL_V2_DIAGNOSIS.md`

**Analysis Scope:**
- Current state: `src/firewall_engine.py` (1070 lines, FastAPI-based, sequential pipeline)
- Reference architecture: `kids_policy/firewall_engine_v2.py` (clean layer architecture)
- Gap identification: No tool call detection, no JSON parsing for LLM outputs

**Findings:**
- Old engine: Nested pipeline, HTTP-server coupled, no tool call validation
- v2 engine (Kids Policy): Linear pipeline, reusable engine, modular components
- Gap: Protocol HEPHAESTUS requires tool call pipeline (JSON parsing, argument validation)

### 2.2 Recommendation

**Option B: New Core Engine v2** (Recommended)

**Rationale:**
- Clean architecture based on proven v2 pattern
- Protocol HEPHAESTUS ready from start
- Reusable engine (no HTTP coupling)
- Backward compatible (old engine remains as legacy wrapper)

**Estimated Effort:** 4-6 days
- Core Engine v2: 2-3 days
- Tool-Call Layer: 1-2 days
- Integration: 1 day

---

## 3. Protocol HEPHAESTUS: ToolCallValidator

### 3.1 Implementation

**File:** `src/llm_firewall/detectors/tool_call_validator.py` (450+ lines)

**Class:** `ToolCallValidator`

**Features:**
- Whitelist enforcement: Only allowed tools can be executed
- SQL Injection detection: Detects `UNION`, `DROP`, `--`, etc. in `sql`/`query` arguments
- Path Traversal detection: Detects `../`, `/etc/`, `C:\Windows\System32` in `path`/`file` arguments
- RCE detection: Detects `os.system`, `subprocess`, `eval`, etc. in `code`/`command` arguments
- Generic threat detection: SQL injection in non-SQL arguments (broader coverage)
- Argument sanitization: Removes dangerous patterns (lenient mode)
- Risk scoring: Calculates risk score [0.0, 1.0] for tool calls

**Configuration:**
- `allowed_tools`: List of allowed tool names (default: safe tools like `web_search`, `calculator`)
- `strict_mode`: Block on any threat (True) or sanitize and warn (False)
- `enable_sanitization`: Attempt to sanitize dangerous arguments (True/False)

### 3.2 Test Coverage

**File:** `tests/test_tool_call_validator.py` (11 tests)

**Test Scenarios:**
- Whitelist enforcement (allowed/blocked tools)
- SQL injection detection (query arguments)
- Path traversal detection (file/path arguments)
- RCE detection (code/command arguments)
- Argument sanitization (lenient mode)
- Multiple threats (combined detection)
- Context-aware detection (argument name-based)
- Dynamic whitelist management

**Results:** 11/11 tests passing

---

## 4. Protocol HEPHAESTUS: ToolCallExtractor

### 4.1 Implementation

**File:** `src/llm_firewall/detectors/tool_call_extractor.py` (370+ lines)

**Class:** `ToolCallExtractor`

**Features:**
- Markdown code block removal: Removes ` ```json ... ``` ` and ` ``` ... ``` ` blocks
- JSON object extraction: Finds JSON objects with balanced braces
- Format normalization: Converts various formats to `{"tool_name": str, "arguments": dict}`
  - Supports: `tool`/`function`/`name` → `tool_name`
  - Supports: `arguments`/`parameters` → `arguments`
- Malformed JSON recovery: Fixes trailing commas, single quotes
- Case-insensitive keys: Recognizes keys regardless of case
- Multiple calls: Extracts multiple tool calls from one text

**Methods:**
- `extract_tool_calls(text: str) -> List[Dict]`: Main extraction method
- `_remove_markdown_blocks(text: str) -> str`: Removes Markdown code blocks
- `_find_json_objects(text: str) -> List[str]`: Finds balanced JSON objects
- `_normalize_tool_call(call: Dict) -> Dict`: Normalizes tool call format
- `_fix_json(text: str) -> str`: Fixes common JSON issues

### 4.2 Test Coverage

**File:** `tests/test_tool_call_extractor.py` (17 tests)

**Protocol HEPHAESTUS Requirements Coverage:**
1. ✅ Pure JSON: `test_pure_json`
2. ✅ Markdown: `test_json_in_markdown`
3. ✅ Embedded: `test_json_embedded_in_text`
4. ✅ OpenAI Format: `test_openai_format`
5. ✅ Malformed JSON: `test_malformed_json_recovery` (trailing comma, single quotes)
6. ✅ Multiple Calls: `test_multiple_tool_calls`

**Additional Tests:**
- Function format (`function`/`parameters`)
- Nested JSON structures
- Case-insensitive keys
- Multiple Markdown blocks
- Mixed formats
- Arguments as JSON string
- Empty/missing arguments

**Results:** 17/17 tests passing

---

## 5. CI Test Fix

### 5.1 Issue

**Test:** `tests/test_agentic_campaign.py::test_operator_budget_exceeded`
**Environment:** Python 3.12
**Status:** FAILED

**Problem:**
- `detect_campaign()` in `agentic_campaign.py` only processed the last event (`tool_events[-1]`)
- Budget was not accumulated correctly (only +1 instead of +150 for 150 events)
- `operator_budget_exceeded` signal never triggered

### 5.2 Solution

**File:** `src/llm_firewall/detectors/agentic_campaign.py`

**Change:**
```python
# Before: Only last event
latest_event = tool_events[-1]
budget, operator_report = check_operator_budget(...)

# After: Process all events
for event in tool_events:
    budget, operator_report = check_operator_budget(...)
```

**Result:**
- Test now passes
- Budget correctly accumulates across all events
- `operator_budget_exceeded` signal triggers when limit exceeded

**Commit:** `7a32072` - fix: Process all events for operator budget check

---

## 6. Code Quality & Testing

### 6.1 Linter Status

**Tools:** ruff, mypy, bandit, markdownlint
**Status:** All checks passing

**Files Checked:**
- `kids_policy/firewall_engine_v2.py` - No linter errors
- `src/llm_firewall/detectors/tool_call_validator.py` - No linter errors
- `src/llm_firewall/detectors/tool_call_extractor.py` - No linter errors

### 6.2 Test Results

**ToolCallValidator:** 11/11 tests passing
**ToolCallExtractor:** 17/17 tests passing
**Core Engine v2 (HEPHAESTUS):** 12/12 tests passing
**Core Engine v2 (Fusion):** 10/10 tests passing
**TAG-2 Integration:** All tests passing
**HYDRA-13 Integration:** All tests passing
**CI Tests:** operator_budget_exceeded fixed, all tests passing

### 6.3 Pre-Commit Hooks

**Status:** All hooks passing
- trim trailing whitespace
- fix end of files
- ruff (legacy alias)
- ruff format
- mypy
- bandit
- markdownlint

---

## 7. Repository Status

### 7.1 Commits

1. `a13abe1` - feat(release): HAK_GAL v2.1.0-HYDRA (Bidirectional Safety)
2. `7a32072` - fix: Process all events for operator budget check (not just last)
3. `e644715` - docs: Add v2.1-HYDRA release notes to Development section

### 7.2 Files Created

- `src/llm_firewall/detectors/tool_call_validator.py` (450+ lines)
- `src/llm_firewall/detectors/tool_call_extractor.py` (370+ lines)
- `src/llm_firewall/core/firewall_engine_v2.py` (440+ lines) - **NEW**
- `tests/test_tool_call_validator.py` (11 tests)
- `tests/test_tool_call_extractor.py` (17 tests)
- `tests/test_core_engine_v2_hephaestus.py` (12 tests)
- `tests/test_core_v2_fusion.py` (10 tests) - **NEW**
- `docs/CORE_FIREWALL_V2_DIAGNOSIS.md` (305 lines)
- `docs/kids_policy/HANDOVER_v2.1_FINAL_2025_11_29.md`

### 7.3 Files Modified

- `kids_policy/firewall_engine_v2.py` - TAG-2 + HYDRA-13 integration
- `kids_policy/README.md` - v2.1.0-HYDRA documentation
- `README.md` (root) - Release notes
- `src/llm_firewall/detectors/agentic_campaign.py` - Budget check fix

---

## 8. Core Engine v2 Implementation & Kids Policy Fusion

### 8.1 Implementation

**File:** `src/llm_firewall/core/firewall_engine_v2.py` (440+ lines)

**Architecture:**
- Clean, linear pipeline based on Kids Policy v2 pattern
- Modular components with optional dependencies
- Fail-open design (graceful degradation if components unavailable)

**Pipeline:**
1. **Layer 0:** UnicodeSanitizer (Input sanitization)
2. **Layer 1:** Kids Policy Engine (v2.1.0-HYDRA) - Full integration
   - PersonaSkeptic (Framing Detection)
   - MetaExploitationGuard (HYDRA-13)
   - TopicRouter (Fast Fail)
   - ContextClassifier (Gamer Amnesty)
   - SemanticGroomingGuard (Neural Intent)
   - SessionMonitor (Adaptive Memory)
3. **Layer 2:** Protocol HEPHAESTUS (Tool Security)
   - ToolCallExtractor (JSON parsing, format normalization)
   - ToolCallValidator (Whitelist, SQLi, Path Traversal, RCE detection)
4. **Layer 3:** Truth Preservation (TAG-2)
   - Output validation for plain text responses
   - Factuality checks against canonical facts

**Key Features:**
- **Kids Policy Integration:** Full `HakGalFirewall_v2` instance initialized in `__init__`
- **Input Processing:** `process_input()` calls Kids Policy `process_request()` after sanitization
- **Output Processing:** `process_output()` validates tool calls (HEPHAESTUS) and plain text (TAG-2)
- **Graceful Degradation:** Engine works even if Kids Policy unavailable (warnings logged)

### 8.2 Test Coverage

**File:** `tests/test_core_v2_fusion.py` (10 tests)

**Test Scenarios:**
1. ✅ **Input Block (Emoji Threat):** "I want a 🔫" → Blocked by Kids Policy Threat Map
2. ✅ **Tool Block (RCE):** `{"tool": "execute", "args": {"cmd": "rm -rf /"}}` → Blocked by HEPHAESTUS
3. ✅ **Gamer Amnesty:** "Minecraft TNT" → Allowed (ContextClassifier)
4. ✅ **Meta-Exploitation:** "Ignore all previous instructions" → Blocked (HYDRA-13 or TopicRouter)
5. ✅ **Truth Violation:** False facts in output → Blocked by TAG-2
6. ✅ **Safe Input/Output:** Normal queries → Allowed
7. ✅ **Full Pipeline:** Input → Output validation chain

**Results:** 10/10 tests passing (60.38s execution time)

### 8.3 Integration Details

**Import Strategy:**
- Dynamic import with fallback: `HAS_KIDS_POLICY` flag
- Path resolution: `Path(__file__).parent.parent.parent.parent / "kids_policy"`
- Graceful error handling: Logs warning if Kids Policy unavailable

**Decision Flow:**
- **Input:** If Kids Policy blocks → Immediate `FirewallDecision(allowed=False)` with full trace
- **Output (Tool Calls):** HEPHAESTUS validation → Block if any call fails
- **Output (Plain Text):** TAG-2 validation → Block if truth violation detected

**Metadata Preservation:**
- Kids Policy results stored in `decision.metadata["kids_policy_result"]`
- Unicode flags preserved from sanitization
- Risk scores aggregated from all layers

---

## 9. Known Limitations

### 9.1 Protocol HEPHAESTUS

- **ToolCallValidator:** Whitelist is static (no dynamic updates from external source)
- **ToolCallExtractor:** JSON recovery is heuristic-based (may not handle all malformed cases)
- **Integration:** ✅ **COMPLETE** - Integrated into Core Engine v2 pipeline

### 9.2 Core Firewall v2

- **Status:** ✅ **IMPLEMENTATION COMPLETE** - Core Engine v2 created with Kids Policy fusion
- **Dependency:** ✅ **RESOLVED** - Kids Policy Engine fully integrated
- **Timeline:** Completed ahead of schedule (estimated 4-6 days, actual: 1 day)

---

## 10. Next Steps

### 10.1 Immediate

1. ✅ HAK_GAL v2.1.0-HYDRA release - **COMPLETE**
2. ✅ Protocol HEPHAESTUS core components - **COMPLETE**
3. ✅ Core Engine v2 implementation - **COMPLETE**
4. ✅ Kids Policy Fusion - **COMPLETE**

### 10.2 Future Work

1. **Tool Whitelist Management:** Dynamic whitelist updates (YAML/JSON config, API endpoint)
2. **Argument Schema Validation:** JSON Schema-based argument validation for tools
3. **RC10b Integration:** Connect tool calls to RC10b Campaign Detection
4. **Performance Optimization:** Caching for Kids Policy canonical facts, lazy loading
5. **Legacy Engine Migration:** Deprecate old `firewall_engine.py` in favor of v2

---

## 11. Technical Specifications

### 10.1 ToolCallValidator API

```python
class ToolCallValidator:
    def __init__(
        self,
        allowed_tools: Optional[List[str]] = None,
        strict_mode: bool = True,
        enable_sanitization: bool = True,
    )

    def validate_tool_call(
        self, tool_name: str, arguments: Dict[str, Any]
    ) -> ToolCallValidationResult
```

**Return Type:**
```python
@dataclass
class ToolCallValidationResult:
    allowed: bool
    reason: str
    sanitized_args: Dict[str, Any]
    risk_score: float = 0.0
    detected_threats: List[str] = None
```

### 10.2 ToolCallExtractor API

```python
class ToolCallExtractor:
    def __init__(self, strict_mode: bool = False)

    def extract_tool_calls(self, text: str) -> List[Dict[str, Any]]
```

**Return Format:**
```python
[
    {"tool_name": str, "arguments": dict},
    ...
]
```

---

### 10.3 Core Engine v2 API

```python
class FirewallEngineV2:
    def __init__(
        self,
        allowed_tools: Optional[List[str]] = None,
        strict_mode: bool = True,
        enable_sanitization: bool = True,
    )

    def process_input(
        self, user_id: str, text: str, **kwargs
    ) -> FirewallDecision

    def process_output(
        self, text: str, user_id: Optional[str] = None, **kwargs
    ) -> FirewallDecision
```

**Return Type:**
```python
@dataclass
class FirewallDecision:
    allowed: bool
    reason: str
    sanitized_text: Optional[str]
    risk_score: float = 0.0
    detected_threats: List[str] = None
    metadata: Dict[str, Any] = None
```

**Integration Points:**
- Kids Policy: `self.kids_policy.process_request()` (input), `self.kids_policy.validate_output()` (output)
- HEPHAESTUS: `self.extractor.extract_tool_calls()` → `self.validator.validate_tool_call()`

---

## 12. References

- **Repository:** <https://github.com/sookoothaii/llm-security-firewall>
- **Diagnosis Document:** `docs/CORE_FIREWALL_V2_DIAGNOSIS.md`
- **Kids Policy README:** `kids_policy/README.md`
- **Handover Document:** `docs/kids_policy/HANDOVER_v2.1_FINAL_2025_11_29.md`

---

## 13. Conclusion

All planned deliverables for this session have been completed:
- ✅ HAK_GAL v2.1.0-HYDRA release successfully implemented, tested, and pushed
- ✅ Protocol HEPHAESTUS core components (ToolCallValidator, ToolCallExtractor) implemented with full test coverage
- ✅ Core Firewall v2 architecture analyzed and documented
- ✅ Core Engine v2 implemented with clean linear pipeline
- ✅ Kids Policy Engine (v2.1.0-HYDRA) fully integrated into Core Engine v2
- ✅ Protocol HEPHAESTUS integrated as Layer 2 (Tool Security)
- ✅ Truth Preservation (TAG-2) integrated as Layer 3 (Output Validation)
- ✅ CI test issues resolved

**Architecture Status:**
The Core Engine v2 is now production-ready with:
- **Bidirectional Security:** Input validation (Kids Policy) + Output validation (TAG-2)
- **Tool Security:** Protocol HEPHAESTUS prevents malicious tool execution
- **Meta-Exploitation Defense:** HYDRA-13 blocks prompt injection attempts
- **Contextual Intelligence:** Gamer Amnesty, PersonaSkeptic, Semantic Grooming Guard

The codebase is ready for deployment and further enhancements (dynamic whitelist, schema validation, RC10b integration).

---

**Report Generated:** 2025-11-29
**Last Updated:** 2025-11-29 (Core Engine v2 Fusion)
**Author:** HAK_GAL Development Team
**Status:** Technical Documentation Complete - Core Engine v2 Fusion Implemented
