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Preflight: MCP server security check
Check an MCP server for auth gaps before you connect
Preflight checks an MCP server for real security gaps before your agent connects: unauthenticated transport, capability grants with no scoping, known-bad description signatures, and a semantic pass reading tool descriptions for injected instructions aimed at the model. Free tier is real: 20 scans/minute, no signup. Tested against real production servers (Linear, Sentry, Atlassian) so it doesn't cry wolf on things already secured properly. Built by All the Possibles.
I kept seeing the same pattern: someone finds an MCP server on a registry, wires it into their agent, and only later notices it hands over a full tool list with zero auth, or grants shell/credential access with no scoping. Nobody actually reads a tool's description before granting it access, the same blind spot as clicking through a permissions dialog.
Built Preflight to check before connecting. It flags unauthenticated transport, unscoped capability grants, known-bad description signatures, and a semantic pass reading tool descriptions for injected instructions aimed at the model. Free tier is real, 20 scans/minute, no signup, MCP server or plain REST API.
Would genuinely like to hear about false positives or negatives if anyone tries it against their own servers.
About Preflight: MCP server security check on Product Hunt
“Check an MCP server for auth gaps before you connect”
Preflight: MCP server security check was submitted on Product Hunt and earned 0 upvotes and 1 comments, placing #9 on the daily leaderboard. Preflight checks an MCP server for real security gaps before your agent connects: unauthenticated transport, capability grants with no scoping, known-bad description signatures, and a semantic pass reading tool descriptions for injected instructions aimed at the model. Free tier is real: 20 scans/minute, no signup. Tested against real production servers (Linear, Sentry, Atlassian) so it doesn't cry wolf on things already secured properly. Built by All the Possibles.
On the analytics side, Preflight: MCP server security check competes within Developer Tools and Security — topics that collectively have 522.7k followers on Product Hunt. The dashboard above tracks how Preflight: MCP server security check performed against the three products that launched closest to it on the same day.
Who hunted Preflight: MCP server security check?
Preflight: MCP server security check was hunted by All The Possibles. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
For a complete overview of Preflight: MCP server security check including community comment highlights and product details, visit the product overview.
All The Possibles