Observed arrival · 2026-10-10
Sealmark checks what MCP servers actually do
A local CLI runs fixed behavioral probes against MCP servers and grades each test pack with supporting evidence.
○Open
⊠Login
$Paid
†Ads
✦Pretty
●Pro
◎Niche
◉Human
⚑Risk
ƒJS
- For
- MCP server builders and maintainers
- Worth noticing
- A critical row-level-security failure caps the grade at D; the illustrated test data is explicitly identified as invented.
Field notes
The documented workflow starts the server once for the core pack and once per database role for the database pack. The sample walks through a claimed-successful INSERT that is caught by a separate state read, and a tenant-isolation failure involving a row labeled T2-SECRET. Those servers and results are explicitly presented as invented examples; the methodology is marked 0.1-draft.
Observed signals
Read the marks
Editorial observations of this landing page, not a rating.
○OpenPublic substance visible
✦PrettyNotable craft visible
●ProPolished or operationally mature
◎NicheUnusually specific use
ƒJavaScriptBrowser-side code central
One card from the complete issue