mcp-supply-guard

mcp-supply-guard

Enables supply-chain integrity for MCP tools by locking tool-definition hashes after review and detecting added, removed, modified, or risky tool definitions.

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README

🧬 mcp-supply-guard

Python License CI No Dependencies

MCP tool-definition supply-chain integrity. 2026 security data point: 43% of MCP servers have command injection vulnerabilities, and tool definitions can mutate after approval — a rug-pull vector. This library locks a baseline of tool-definition content hashes after review, then verifies later loads: flagging added / removed / modified tools, plus a risk scan for command-execution danger signals.

Zero dependencies. Pure Python stdlib.

Quick Start

pip install mcp-supply-guard

Usage

from mcp_supply_guard import load_tools, fingerprint, verify, scan_risk

baseline = [fingerprint(t) for t in load_tools("approved.json")]  # lock after review
report = verify(load_tools("current.json"), baseline)
print(report.clean)          # False if any tool added/modified
for f in report.findings:
    print(f.kind, f.tool, f.message)

risks = scan_risk(load_tools("current.json"))

CLI

mcp-supply-guard lock approved.json baseline.json
mcp-supply-guard verify current.json baseline.json --json    # CI exit 1 on added/modified
mcp-supply-guard risk current.json --json

tools.json

{"tools": [{"name": "search", "description": "Search the index",
            "inputSchema": {"type": "object", "properties": {"q": {"type": "string"}}}}]}

Findings

Kind Severity Meaning
added error tool added after baseline locked
modified error definition hash changed (rug-pull vector)
removed warning baseline tool missing now
risky error/warning command-execution danger signals in description/schema

License

MIT © wwb-bill

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