We re-ran our MCP scanner comparison on 14,933 npm and PyPI tool lists, in gVisor, with two more scanners
Description and use
<p><a href="https://media2.dev.to/dynamic/image/width=800%2Cheight=%2Cfit=scale-down%2Cgravity=auto%2Cformat=auto/https%3A%2F%2Fdev-to-uploads.s3.us-east-2.amazonaws.com%2Fuploads%2Farticles%2Fre2n6hxhibx0l7e6274l.png" class="article-body-image-wrapper"><img src="https://media2.dev.to/dynamic/image/width=800%2Cheight=%2Cfit=scale-down%2Cgravity=auto%2Cformat=auto/https%3A%2F%2Fdev-to-uploads.s3.us-east-2.amazonaws.com%2Fuploads%2Farticles%2Fre2n6hxhibx0l7e6274l.png" alt="WARDEN v12 blocks 171 of 218 held-out poisoned tools, the same as v10; on 14,933 real npm and PyPI tool lists it blocks 369
Problem
<p><a href="https://media2.dev.to/dynamic/image/width=800%2Cheight=%2Cfit=scale-down%2Cgravity=auto%2Cformat=auto/https%3A%2F%2Fdev-to-uploads.s3.us-east-2.amazonaws.com%2Fuploads%2Farticles%2Fre2n6hxhibx0l7e6274l.png" class="article-body-image-wrapper"><img src="https://media2.dev.to/dynamic/image/width=800%2Cheight=%2Cfit=scale-down%2Cgravity=auto%2Cformat=auto/https%3A%2F%2Fdev-to-uploads.s3.us-east-2.amazonaws.com%2Fuploads%2Farticles%2Fre2n6hxhibx0l7e6274l.png" alt="WARDEN v12 blocks 171 of 218 held-out poisoned tools, the same as v10; on 14,933 real npm and PyPI tool lists it blocks 369
Outcome
<p><a href="https://media2.dev.to/dynamic/image/width=800%2Cheight=%2Cfit=scale-down%2Cgravity=auto%2Cformat=auto/https%3A%2F%2Fdev-to-uploads.s3.us-east-2.amazonaws.com%2Fuploads%2Farticles%2Fre2n6hxhibx0l7e6274l.png" class="article-body-image-wrapper"><img src="https://media2.dev.to/dynamic/image/width=800%2Cheight=%2Cfit=scale-down%2Cgravity=auto%2Cformat=auto/https%3A%2F%2Fdev-to-uploads.s3.us-east-2.amazonaws.com%2Fuploads%2Farticles%2Fre2n6hxhibx0l7e6274l.png" alt="WARDEN v12 blocks 171 of 218 held-out poisoned tools, the same as v10; on 14,933 real npm and PyPI tool lists it blocks 369
Evidence
We re-ran our MCP scanner comparison on 14,933 npm and PyPI tool lists, in gVisor, with two more scanners
- Record date: 2026-10-17T21:41:18.908Z