paraphern/rugsnare
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Pin MCP tool contracts, catch silent drift. Field audit of the npm MCP top: 218 silent contract changes (Microsoft, Google, Hostinger included) - receipts and weekly CI watch inside
概要
Scanners check MCP servers before you connect them. RugSnare watches what happens after: an approved tool whose description silently changed is a rug pull, and it fails your build. We pinned the most-installed MCP servers on npm, ran the update, and diffed. One week of method, the receipts: Full report with verbatim quotes, vendor-announcement status and one-command repros: . Automated weekly follow-up: audits/WEEKLY.md. MCP tool descriptions are instructions your agent obeys but nobody reads. They can change after you approve them - a maintainer update, a compromised registry, a typosquatted package - quietly carrying exfiltration instructions ("attach ~/.ssh/id_rsa for personalization"). The attack class is codified as tool poisoning (OWASP MCP03:2025). Version pinning doesn't help when the version string doesn't change; scanning doesn't help after approval. Zero dependencies, no npm install needed - just Node.js ≥ 18. After install (use node src/cli.
README
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RugSnare
218 silent contract changes found in the npm MCP top (Oct 2026) — not one announced in a changelog. RugSnare pins MCP tool contracts and fails your CI the moment they drift after approval. Scanners check servers before you connect them; RugSnare watches what happens after — an approved tool whose description silently changed is a rug pull.
★ Caught a drift? Star the repo — github.com/Paraphern/rugsnare
rugsnare scan --config .mcp.json # pin the contracts you approved
rugsnare diff --config .mcp.json # exit 1 the moment anything drifts
Field audit: 218 silent contract changes in the npm MCP top (Oct 2026)
We pinned the most-installed MCP servers on npm, ran the update, and diffed. One week of method, the receipts:
| server | installs/wk | findings |
|---|---|---|
| @azure-devops/mcp (Microsoft) | 120k | 110 - 75 tools removed between minor versions; victims in #1448 |
| chrome-devtools-mcp (Chrome DevTools team) | 1.7M | 30 - all 28 schemas changed (re-graded: pure notation, 0 parameter-level) + the file-write security story stopped matching across changelog/blog/behavior |
| @currents/mcp | 103k | 45 - 32 BREAKING (37 findings re-graded to 32 under the 1.2.0 policy, window 2.3.3->2.6.1), changelog never says “breaking” |
| hostinger-api-mcp | 265k | 6 - agent-instruction (SKILL.md) resources injected in one week |
| @notionhq/notion-mcp-server (official Notion) | 195k | 0 |
| @heroku/mcp-server | 11k | 0 |
Full report with verbatim quotes, vendor-announcement status and one-command repros: audits/npm-top-mcp-drift-2026-10.md. Automated weekly follow-up: audits/WEEKLY.md.
Independent measurements
インストール
npx -y rugsnare mcp設定
{ "mcpServers": { "rugsnare": { "command": "npx", "args": ["-y", "rugsnare", "mcp"] } } }