Gadriel AI Security Harness

Gadriel — AI Security Harness for GitHub Copilot

Security scanning for the code Copilot writes: SAST, secrets, dependencies (SCA/SBOM), containers and configuration, including AI-specific risks like prompt injection and the OWASP LLM Top 10 — 3,000+ rules, scanned on your machine. Gadriel plugs into Copilot as an MCP server plus repository instructions, prompts, and reviewer agents.

Product Overview · Documentation · MCP Tools Reference · SAST Benchmarks

Part of the Gadriel AI Security Harness, alongside VS Code, Claude Code, Codex, and Cursor.

Get it

Easiest — the VS Code extension. Install Gadriel AI Security Harness from the Marketplace. It registers the gadriel MCP server for Copilot automatically and adds a Gadriel: Scan Repository command — no config to edit.

Or add the MCP server yourself. The server is published to the GitHub MCP Registry as io.github.Gadriel-ai/gadriel, so it shows up in VS Code's MCP: Browse Servers and Copilot Chat's @mcp search — add it in a click. To wire it per-repo instead, drop this .vscode/mcp.json into your project (needs Node for npx, or npm install -g gadriel):

{ "servers": { "gadriel": { "type": "stdio", "command": "npx", "args": ["-y", "gadriel@1.7.0", "code", "mcp"] } } }

Add the Copilot guidance (optional). Copy the .github/ directory into your repo so Copilot knows how to use Gadriel:

Path	What
.github/copilot-instructions.md	repo-wide guidance, auto-applied
.github/instructions/*.instructions.md	17 topic rules, scoped by applyTo
.github/prompts/*.prompt.md	/gadriel-scan, /gadriel-fix, /gadriel-status, …
.github/agents/*.agent.md	8 reviewer agents

Use

In Copilot Chat (agent mode), just ask: "Run a Gadriel security scan on this repo and summarize the findings," or invoke a prompt like /gadriel-scan. The gadriel MCP tools — validate_file, findings_for_path, fix_finding, validate_buffer, and more — are available to Copilot directly.

Good to know

• No automatic edit guardrail here. Copilot/VS Code has no edit-time hook (Cursor and Codex do), so scanning runs on request via the MCP tools and prompts rather than blocking each edit.
• Enterprise: Copilot Business/Enterprise can allowlist the gadriel MCP server through managed MCP policy.
• Privacy: code is scanned locally and never uploaded. First run registers an anonymous device credential with app.gadriel.ai (a random device id — no hostname, username, or keys); set GADRIEL_NO_ANONYMOUS_AUTH=1 to skip. See the privacy policy.

Maintainers

The registry listing is (re)published by .github/workflows/publish-mcp.yml (GitHub OIDC — an org namespace can only be published from CI in a Gadriel-ai repo). After a new gadriel npm release, bump server.json and the .vscode/mcp.json pin, then re-run that workflow.

License

This repository is Apache-2.0. The gadriel scanner it runs is proprietary, under the Gadriel terms.