palisade-scanner 0.1.1

Scan web content for prompt injection, hidden instructions, and adversarial content targeting AI agents

Palisade Scanner 🔍

Try it live on HuggingFace Spaces — scan any URL without installing anything.

Scan web content for prompt injection, hidden instructions, and adversarial content targeting AI agents.

AI agents browse the web, read documents, and consume external content. Adversaries hide instructions in invisible text, HTML metadata, encoded payloads, and zero-width characters — Palisade finds them all.

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What makes Palisade unique

Capability	Palisade Scanner	Manual review	Generic scrapers
Hidden text detection	✅ 20+ CSS/HTML techniques	❌	❌
Injection pattern matching	✅ 100+ regexes, 5 categories	❌	❌
LLM-as-judge classifier	✅ understands adversarial intent	N/A	❌
Metadata analysis	✅ comments, JSON-LD, meta, data attrs	❌	❌
Exfiltration detection	✅ URLs, eval(), fetch(), redirects	❌	❌
MCPGuard policy generation	✅ auto-generate rules	❌	❌
CI/CD mode	✅ --ci --threshold high	❌	❌
Zero-width character detection	✅	❌	❌

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Why

AI agents browse the web, read documents, and consume external content. Adversaries can hide instructions in:

• Invisible text (white-on-white, zero font size, off-screen positioning)
• HTML comments and metadata
• Base64 encoded payloads
• Zero-width character injections
• Instructions disguised as product descriptions or reviews

This scanner finds them all and tells you what to do about it.

Quick Start

# Install
pip install palisade-scanner

# CLI: scan a URL
pis scan https://example.com
# or
palisade scan https://example.com

# Web UI: open the dashboard
pis web

# Docker
docker compose up
# → http://localhost:8000

Usage

CLI

# Scan a URL
pis scan https://example.com

# Scan a local file
pis scan --file suspicious.html

# Scan pasted text
pis scan --paste "<!-- ignore instructions -->"

# JSON output
pis scan https://example.com --format json

# CI/CD mode (exit code reflects risk)
pis scan https://example.com --ci --threshold high

# Generate MCPGuard policy rules
pis policies https://evil-site.com

API

# Scan via REST API
curl "http://localhost:8000/api/scan?url=https://example.com"

# HTML report
curl "http://localhost:8000/api/scan/https://example.com"

How It Works

Detection Layers

Layer	What It Detects
Hidden Text Detector	20+ CSS/HTML hiding techniques (display:none, visibility, opacity, color matching, off-screen, zero-width chars, HTML comments)
Injection Pattern Matcher	100+ regex patterns across 5 categories (jailbreak, role override, exfiltration, tool manipulation, impersonation)
Instruction Classifier	LLM-as-judge that understands adversarial intent (requires API key)
Metadata Analyzer	HTML comments, JSON-LD, meta tags, data attributes, <noscript>, <template>
Exfiltration Detector	URLs, endpoints, eval() patterns, redirect attempts, fetch() calls

Scoring

Risk Score: 0-100

Weighted formula:
  base = 100
  - critical * 25
  - high * 10
  - medium * 3
  - low * 1

Categories: none (0-5) → low (6-20) → medium (21-50) → high (51-80) → critical (81-100)

Architecture

User (CLI / Web / API)
        │
        ▼
PipelineOrchestrator
        │
        ├── Loader (URL / File / Paste / PDF)
        │
        ├── Detector Pipeline (parallel)
        │   ├── HiddenTextDetector
        │   ├── InjectionPatternMatcher
        │   ├── MetadataAnalyzer
        │   ├── ExfiltrationDetector
        │   └── InstructionClassifier (LLM)
        │
        ├── ScoringEngine
        │
        └── Reporters
            ├── JSON / Markdown / Simple
            ├── Policy Generator (MCPGuard)
            └── Web UI (HTMX)

Project Structure

src/scanner/
├── cli.py              # Typer CLI
├── api.py              # FastAPI web app
├── config.py           # Settings (env vars)
├── domain/
│   ├── models.py       # Pydantic models
│   └── scoring.py      # Risk score engine
├── loaders/
│   ├── url.py          # HTTP URL fetcher
│   ├── pdf.py          # PDF extractor
│   └── paste.py        # Raw text
├── detectors/
│   ├── hidden_text.py       # CSS/HTML hiding
│   ├── injection_patterns.py # 100+ regex patterns
│   ├── instruction_classifier.py  # LLM-as-judge
│   ├── metadata_analyzer.py # Comments/meta/tags
│   └── exfiltration.py     # Data theft patterns
├── pipeline/
│   └── orchestrator.py # Scan pipeline
├── reporters/          # JSON/MD/Simple output
├── policies/           # MCPGuard rule generation
└── utils/              # DOM helpers

Integration

MCPGuard

Generate rules compatible with MCPGuard:

pis scan https://evil-site.com --format mcpguard > rules.yaml
mcpguard load-rules rules.yaml

CI/CD

# .github/workflows/check-urls.yml
- name: Scan for prompt injection
  run: |
    pis scan ${{ matrix.url }} --ci --threshold medium

Roadmap

• v0.1 — Scanner core: CLI, 5 detectors, scoring, policy generation
• v0.2 — Live Monitor: scheduled re-scans, webhook alerts, diff detection
• v0.3 — Agent Validator: Browser Use agent tests pages in real time
• v0.4 — Content Safety Proxy: reverse proxy that strips injections
• v0.5 — Reputation Engine: web of trust for agent-safe URLs
• v0.6 — Red Team Lab: adversarial page generator + benchmark suite
• v0.7 — Certification Pipeline: verified AgentSafe badges

Related Projects

• MCPGuard — Runtime security proxy for MCP
• MCPwn — Offensive security testing for MCP
• MCPscop — Unified security dashboard

License

MIT