GuardianShield
Universal AI security layer — an open-source MCP server for code scanning, PII detection, prompt injection defense, secret detection, dependency auditing, and audit logging.
Zero dependencies · 27 MCP tools · 5 safety profiles · 108+ detection patterns
Features
- Code Vulnerability Scanning — SQL injection, XSS, command injection, path traversal with CWE IDs and auto-fix remediation
- Cross-line Data Flow Analysis — DeepEngine tracks tainted data from sources to sinks across multiple lines using AST-based taint propagation (Python) and regex (JS/TS)
- Dependency Security — Version-aware CVE matching against OSV.dev for PyPI, npm, Go, and Packagist ecosystems
- Manifest Parsing — Auto-detects 11 formats (requirements.txt, package.json, yarn.lock, go.mod, composer.json, and more)
- Prompt Injection Defense — 9+ detection patterns for instruction override, role hijacking, ChatML injection
- PII Detection — Email, SSN, credit card, phone, IP — with automatic redaction in findings
- Secret Detection — AWS keys, GitHub tokens, Stripe keys, JWTs, passwords, connection strings
- Safety Profiles — 5 built-in profiles (general, education, healthcare, finance, children)
- Audit Logging — SQLite-backed scan history with finding retrieval and filtering
Install
pip install guardianshield
Quick Start
# Register with Claude Code
claude mcp add guardianshield -- guardianshield-mcp
# Or run directly
guardianshield-mcp
Editor Integration
# Claude Code
claude mcp add guardianshield -- guardianshield-mcp
# VS Code (.vscode/mcp.json)
{"servers": {"guardianshield": {"type": "stdio", "command": "guardianshield-mcp"}}}
# Cursor (.cursor/mcp.json)
{"mcpServers": {"guardianshield": {"command": "guardianshield-mcp"}}}
# Claude Desktop (claude_desktop_config.json)
{"mcpServers": {"guardianshield": {"command": "guardianshield-mcp"}}}
MCP Tools
Scanning
| Tool | Description |
|---|---|
scan_code |
Scan source code for vulnerabilities and hardcoded secrets |
scan_file |
Scan a single file (auto-detects language from extension) |
scan_directory |
Recursively scan a directory with filtering and progress streaming |
scan_input |
Check user/agent input for prompt injection attempts |
scan_output |
Check AI output for PII leaks and content violations |
check_secrets |
Detect hardcoded secrets and credentials |
scan_files |
Scan multiple files in one call |
scan_diff |
Parse unified diff and scan only added lines |
Dependency Security
| Tool | Description |
|---|---|
check_dependencies |
Check packages for known CVEs via OSV.dev (PyPI, npm, Go, Packagist) |
sync_vulnerabilities |
Sync the local OSV vulnerability database |
parse_manifest |
Parse any supported manifest file (11 formats) into dependency objects |
scan_dependencies |
Scan a directory for manifest files and check all deps for vulnerabilities |
False Positive Management
| Tool | Description |
|---|---|
mark_false_positive |
Mark a finding as false positive (flags future matches) |
list_false_positives |
List active false positive records with optional filter |
unmark_false_positive |
Remove a false positive record by fingerprint |
Engine Management
| Tool | Description |
|---|---|
list_engines |
List available analysis engines with capabilities |
set_engine |
Set active analysis engines for code scanning |
Three engines ship built-in: regex (line-by-line pattern matching, enabled by default), deep (cross-line taint tracking), and semantic (structure-aware confidence adjustment).
CI & Developer Workflow
| Tool | Description |
|---|---|
export_sarif |
Export findings as SARIF 2.1.0 JSON for GitHub Code Scanning and CI |
save_baseline |
Save current findings as a baseline for delta scanning |
scan_with_baseline |
Scan code and report only new findings vs. baseline |
check_quality_gate |
Evaluate findings against severity thresholds (pass/fail/warn) |
scan_files |
Scan multiple files in one call |
scan_diff |
Parse unified diff and scan only added lines |
Configuration & Utilities
| Tool | Description |
|---|---|
get_profile |
Get current safety profile configuration |
set_profile |
Switch safety profile (general, education, healthcare, finance, children) |
test_pattern |
Test a regex pattern against sample code for custom pattern development |
audit_log |
Query the security audit log |
get_findings |
Retrieve past findings with filters |
shield_status |
Get health, configuration, and OSV cache statistics |
Configuration
Set environment variables to customize behavior:
| Variable | Description | Default |
|---|---|---|
GUARDIANSHIELD_PROFILE |
Default safety profile | general |
GUARDIANSHIELD_AUDIT_PATH |
Path to SQLite audit database | ~/.guardianshield/audit.db |
GUARDIANSHIELD_DEBUG |
Enable debug logging (1) |
disabled |
Documentation
Full documentation: sparkvibe-io.github.io/GuardianShield
License
Apache 2.0
1 maintainer
Metadata
1 maintainer
Release files for guardianshield 1.2.1
For a detailed explanation of source distributions (sdists) and built distributions (wheels), please see the package formats documentation.
Source distribution (sdist)
| File | Size | Uploaded | |
|---|---|---|---|
| guardianshield-1.2.1.tar.gz | 280.4 kB | Details |
Built distribution (wheel)
| File | Interpreter | ABI | Platform | Reset |
|---|---|---|---|---|
| guardianshield-1.2.1-py3-none-any.whl | Python 3 | none | any | Details |
Total release size: 410.4 kB
Release files / guardianshield-1.2.1.tar.gz
| Download URL | guardianshield-1.2.1.tar.gz |
|---|---|
| Size | 280.4 kB |
| Tags | Source |
|
SHA-256 checksum How to use checksums |
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BLAKE2b-256 checksum How to use checksums |
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Transparency logRelease files / guardianshield-1.2.1-py3-none-any.whl
| Download URL | guardianshield-1.2.1-py3-none-any.whl |
|---|---|
| Size | 130.1 kB |
| Tags | Python 3 |
|
SHA-256 checksum How to use checksums |
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Uploaded using Trusted Publishing? What is trusted publishing? |
Yes |
| Uploaded via |
twine/6.1.0 CPython/3.13.7
|
Provenance
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PyPI Publish Attestation
PyPI verified that this artifact, at this checksum, originated from the publisher listed below.
Signed by GitHub Actions, verified by PyPI on Mar 3, 2026.
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