PCI DSS v4.0.1 Compliance Checker

pci-dss-mcp

Static analysis MCP server for Go payment service codebases. Every detected PCI DSS v4.0.1 violation in a Go payment service codebase is mapped to the specific requirement number before the code ships.

What it does

pci-dss-mcp is a stdio MCP server that runs 12 scanners, an orchestrator, and an AI triage engine over a Go payment service codebase. Each finding carries a requirement_id mapped to a specific PCI DSS v4.0.1 line item; see docs/requirement-mapping.md for the canonical rule-to-requirement table and testdata/vulnerable-payment-service/EXPECTED-FINDINGS.md for live golden output.

What pci-dss-mcp catches today

• HTTP framework input flow into log / error / panic sinks. Tier 1 frameworks (gin, chi, gorilla/mux, net/http (Go 1.22+), echo v4, fiber v2) and Tier 1 loggers (log/slog, logrus, zap, zerolog, logr, klog, hclog) ship in v0.7. Tier 2 (kratos, apex/log, charmbracelet/log) lands in v0.8. Tier 3 (fasthttp, beego, iris, httprouter, project-internal) is user-configurable via Phase 25 YAML once shipped. See docs/http_input_taint.md.

What pci-dss-mcp is NOT

• Not a replacement for broad SAST. Use Semgrep, CodeQL, or gosec for OWASP Top-10 and language-agnostic vulnerabilities.
• Not a replacement for LLM-based code review. pci-dss-mcp maps payment-specific issues to PCI DSS requirement IDs; LLM agents catch broad bugs via reasoning. The two layers compose.
• Not Go-agnostic. Go-specific AST patterns and taint flow tracing are what make the precision possible.
• Not a QSA replacement. Static analysis covers ~6% of PCI DSS v4.0.1 requirements. A Qualified Security Assessor must sign off on the rest.

Install

Go install (primary)

Requires Go 1.25+; use Go 1.26.9 or newer, because Go 1.25 is past end of life:

go install github.com/shyshlakov/pci-dss-mcp@latest

The binary lands at $(go env GOPATH)/bin/pci-dss-mcp. See docs/install-from-source.md for PATH resolution, the macOS codesign provenance fix, cosign verification, and the MCP client JSON config.

Docker (alternative)

docker pull ghcr.io/shyshlakov/pci-dss-mcp:v0.6.2

Useful for CI pipelines, QSA auditors who do not develop Go locally, or any environment without a host Go toolchain.

MCP Registry

Listed as io.github.shyshlakov/pci-dss-mcp at registry.modelcontextprotocol.io. Auto-published on every tag.

Usage

Add to your MCP client config (Claude Desktop claude_desktop_config.json, Cursor .cursor/mcp.json, or claude mcp add for Claude Code):

{
  "mcpServers": {
    "pci-dss-mcp": {
      "command": "docker",
      "args": ["run", "-i", "--rm",
        "--mount", "type=bind,src=/Users/you/go/src,dst=/Users/you/go/src,readonly",
        "ghcr.io/shyshlakov/pci-dss-mcp:v0.6.2"]
    }
  }
}

src= and dst= mirror the same absolute path so the container sees your code at the same path your host uses; prompts pass the normal host path with no translation. For the go install variant and per-client examples, see docs/usage.md.

Two prompts to paste into your MCP client:

1. Run pci-dss-mcp triage on /Users/you/payments-service. Use min_severity=MEDIUM and group findings by PCI DSS requirement.
2. Generate a PCI DSS compliance report for /Users/you/payments-service in JSON format. Show requirement-level pass/fail status and severity counts.

Tools

All tools declare typed OutputSchema. See docs/tools.md for the catalog index and migration history.

Documentation

• docs/usage.md, client setup, prompt templates, suppressing findings
• docs/severity.md, severity model and rule-to-severity mapping
• docs/taint.md, taint analysis defaults and toggles
• docs/scoping.md, package exclusion and CDE scope
• docs/comparison.md, pci-dss-mcp vs Semgrep / CodeQL / gosec / Snyk Code
• docs/ci-cd.md, GitHub Actions and GitLab CI integration
• docs/pci-coverage.md, PCI DSS v4.0.1 requirement coverage matrix
• docs/install-from-source.md, source build, cosign verification, reload
• docs/requirement-mapping.md, canonical rule_id to requirement_id table
• CONTRIBUTING.md, development setup, fuzz targets
• ROADMAP.md, planned features
• CHANGELOG.md, version history

Status

Active development, pre v1.0. See ROADMAP.md and CHANGELOG.md.

License

MIT, see LICENSE.

pci-dss-mcp is a static analysis tool. It cannot replace a Qualified Security Assessor. Use its output as input to your compliance process, not as the compliance itself.