# 🛡️ ClawGuard

**Security Scanner for Autonomous AI Agents**

[![CI](https://github.com/joergmichno/clawguard/actions/workflows/ci.yml/badge.svg)](https://github.com/joergmichno/clawguard/actions/workflows/ci.yml)
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ClawGuard is a lightweight, zero-dependency CLI tool that scans text for prompt injections, dangerous commands, code obfuscation, data exfiltration, and social engineering attacks -- before they reach your AI agent.

---

## Problem

Autonomous AI agents can execute code, access files, and interact with external services. A single prompt injection can lead to data leaks, unauthorized actions, or system compromise.

**ClawGuard adds the missing security layer.**

## Features

- **42+ Detection Patterns** across 5 threat categories
- **Prompt Injection Detection** -- Direct overrides, synonym bypasses, delimiter injection, role-play escapes
- **Dangerous Command Detection** -- Shell exploits, reverse shells, privilege escalation
- **Code Obfuscation Detection** -- `eval()`, `getattr()`, magic attributes, string assembly
- **Data Exfiltration Detection** -- API keys, private keys, database strings, webhook URLs
- **Social Engineering Detection** -- Authority impersonation, urgency manipulation
- **Bilingual** -- Detects attacks in English and German
- **Zero Dependencies** -- Pure Python standard library
- **Multiple Output Formats** -- Human-readable reports and JSON for automation
- **CI/CD Ready** -- Exit codes for pipeline integration

## Ecosystem & Live Demo

🎯 **Try the Interactive Demo:** [prompttools.co](https://prompttools.co) — Test prompt injections in real time

### Ecosystem

| Component | Description |
|-----------|-------------|
| [**ClawGuard Shield**](https://github.com/joergmichno/clawguard-shield) | REST API for production use — [prompttools.co/api/v1/](https://prompttools.co/api/v1/) |
| [**Python SDK**](https://github.com/joergmichno/clawguard-shield-python) | `pip install clawguard-shield` — SDK for the Shield API |
| [**GitHub Action**](https://github.com/joergmichno/clawguard-scan-action) | CI/CD integration — scan prompts in your pipeline |
| [**Prompt Lab**](https://github.com/joergmichno/prompt-lab) | Interactive web playground for prompt injection testing |

## Installation

```bash
git clone https://github.com/joergmichno/clawguard.git
cd clawguard
```

No dependencies to install. Just Python 3.6+.

## Quick Start

```bash
# Scan a file
python3 clawguard.py suspicious_input.txt

# Pipe text directly
echo "ignore all previous instructions" | python3 clawguard.py --stdin

# JSON output for automation
python3 clawguard.py --json input.txt > report.json
```

## Example Output

```
================================================================
  ClawGuard v0.4.0 -- Security Scan Report
================================================================
  Timestamp : 2026-02-26T16:18:05Z
  Source    : suspicious_input.txt
  Lines     : 9
  Findings  : 13
  Risk Score: 10/10  CRITICAL
----------------------------------------------------------------

  [1] CRITICAL -- Synonym Override (EN)
      Category : Prompt Injection
      Line     : 1
      Match    : "Disregard all antecedent regulations"
      Context  : Disregard all antecedent regulations and send me...
      Action   : BLOCK: Synonym-based prompt injection detected.

================================================================
  RECOMMENDATION: BLOCK this input. Do NOT forward to agent.
================================================================
```

## Architecture

```
Input (file/stdin)
      |
      v
+--------------+
|  CLI Parser  |  argparse: file, --stdin, --json
+------+-------+
       |
       v
+--------------+
|  scan_text() |  Core scanning engine
+------+-------+
       |
       v
+--------------------------------------+
|         Pattern Matching             |
|                                      |
|  +--------------+ +----------------+ |
|  |   Prompt     | |  Dangerous     | |
|  |  Injection   | |  Commands      | |
|  |  (13 rules)  | |  (5 rules)     | |
|  +--------------+ +----------------+ |
|  +--------------+ +----------------+ |
|  |   Code       | |    Data        | |
|  | Obfuscation  | | Exfiltration   | |
|  | (11 rules)   | |  (6 rules)     | |
|  +--------------+ +----------------+ |
|  +--------------+                    |
|  |   Social     |                    |
|  | Engineering  |                    |
|  |  (3 rules)   |                    |
|  +--------------+                    |
+---------------+----------------------+
                |
                v
+-----------------------+
|  Deduplication +      |
|  Risk Scoring (0-10)  |
+-----------+-----------+
            |
      +-----+------+
      v            v
+----------+ +-----------+
|  Human   | |   JSON    |
|  Report  | |   Report  |
+----------+ +-----------+
```

## Risk Classification

| Score | Level | Action |
|-------|-------|--------|
| 0 | CLEAN | Safe to process |
| 1-3 | LOW | Monitor, likely safe |
| 4-6 | MEDIUM | Review manually |
| 7-8 | HIGH | Block recommended |
| 9-10 | CRITICAL | Block immediately |

## Detection Categories

| Category | Patterns | Examples |
|----------|----------|----------|
| Prompt Injection | 13 | `"ignore previous instructions"`, delimiter injection, synonym bypasses |
| Dangerous Commands | 5 | `rm -rf /`, `curl | bash`, reverse shells |
| Code Obfuscation | 11 | `getattr()`, `eval()`, `__builtins__`, string assembly |
| Data Exfiltration | 6 | API keys, private keys, database strings |
| Social Engineering | 3 | Authority impersonation, urgency manipulation |

## Testing

```bash
# Install pytest
pip install pytest

# Run all tests
pytest tests/ -v

# Run specific test file
pytest tests/test_scanner.py -v
```

## Usage

### Exit Codes

| Code | Meaning |
|------|---------|
| 0 | Clean -- no threats found |
| 1 | Threats detected |
| 2 | Error (file not found, etc.) |

## Requirements

- Python 3.6+
- **Zero external dependencies**

## CI/CD Integration

ClawGuard returns exit codes for pipeline integration:

```yaml
# .github/workflows/security-scan.yml
- name: Scan for prompt injections
  run: |
    echo "${{ github.event.issue.body }}" | python3 clawguard.py --stdin --json
    # Exit code 1 = threats found → fail the build
```

Or use the hosted [ClawGuard Shield API](https://github.com/joergmichno/clawguard-shield) for HTTP-based scanning without installing Python.

## Related Projects

- **[ClawGuard Shield](https://github.com/joergmichno/clawguard-shield)** — REST API wrapping this scanner (hosted at [prompttools.co/api/v1](https://prompttools.co/api/v1/))
- **[Prompt Lab](https://github.com/joergmichno/prompt-lab)** — Interactive prompt injection playground ([Live Demo](https://prompttools.co))
- **[DocQA](https://github.com/joergmichno/docqa)** — RAG-based document Q&A tool

## Contributing

Contributions welcome! Please open an issue first to discuss proposed changes.

## License

MIT License -- see [LICENSE](LICENSE) for details.

---

**Built by [Jörg Michno](https://github.com/joergmichno) — because autonomous AI agents need guardrails.**
