QAmcp

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Directory / Preflight

Preflight

Q: Is Preflight MCP server safe?

QAmcp's test on 30 Oct 2026: No hidden instructions were found in its tool descriptions. Its error messages showed no secrets or internal details. All 4 of its tools are labeled read-only. Overall it scored 83/100 on 30 Oct 2026. A test can only see what the server shows from outside, not what it does with your data behind the scenes. Connect servers from makers you trust.

by preflight.allthepossibles.com · https://preflight.allthepossibles.com/mcp

Scans an MCP server for security gaps before your agent connects. Free tier, no signup.

4 tools✓ all read-only✓ no account neededPricing: not listed

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83 /100

PASS · WITH NOTES

11 of 11 checks · 30 Oct 2026

Is Preflight MCP server safe?

No hidden instructions were found in its tool descriptions.
Its error messages showed no secrets or internal details.
All 4 of its tools are labeled read-only.
Overall it scored 83/100 on 30 Oct 2026.

A test can only see what the server shows from outside, not what it does with your data behind the scenes. Connect servers from makers you trust.

What it can do

4 tools, in the server's own words.

scan_mcp_serverread-only

Check an MCP server for real risk signals before trusting it: unauthenticated transport, capability overreach (filesystem/shell/credential access with no scopi…

scan_contentread-only

Check a document or web page for hidden instructions before an agent reads, summarizes, or acts on it: invisible Unicode, obfuscated payloads, and (on Pro) a s…

scan_extensionread-only

Check a VS Code extension or a Claude Skill before installing or trusting it.

check_outputread-only

Check a structured output you're about to return or act on for degenerate-answer patterns a schema check can't see: invalid JSON, a placeholder value ('TBD', '…

Test results

Safe mode: only tools labeled read-only were run. How the test works

!
Ready for the newest MCP version
1 warning
- !Uses an older MCP version (2025-06-18). It works today, but it isn't on the July 2026 version (2026-07-28) yet.
note
!
Every tool is described
1 warning
- !scan_mcp_server: Inputs with no description: serverName
note
!
Bad inputs give a clean error
1 warning
- !check_output: Accepted wrong type for "expectedFields" without complaining
- and 4 more
note
!
Follows MCP best practices (not scored yet)
1 tip (not scored)
- !3 tools answer with structured data but don't declare its shape (outputSchema): scan_mcp_server, scan_content, check_output. If those answers change shape, nothing can catch it; with a schema, every answer is checked.
note
✓
ConnectsConnected in 191 ms
pass
✓
Lists its toolsFound 4 tools
pass
✓
Tools are labeled safe or dangerousEvery tool has a safety label
pass
✓
No hidden instructionsNo hidden instructions found in tool descriptions
pass
✓
Tools work with good inputs
All good
- ✓scan_mcp_server: Worked (361 ms)
- ✓scan_content: Worked (261 ms)
- ✓scan_extension: Answered with an error, probably because of our sample input: Marketplace query returned 400
- ✓check_output: Worked (192 ms)
pass
✓
Fast enough
All good
- ✓Connecting took 191 ms
- ✓Listing tools took 16 ms
- ✓Average tool answer: 269 ms
- ✓scan_mcp_server: Slowest tool: scan_mcp_server (361 ms)
pass
✓
No secrets leakedChecked 9 error messages: no secrets or internal details
pass
–
Tools work togetherNo tool's answer could be fed into another tool, so there were no chains to test (not counted either way)
not tested

Test it yourself

Free and open source. Same checks, same score.

npx qamcp-cli https://preflight.allthepossibles.com/mcp

Show this score on GitHub

Free for every server in the directory. Paste this into your README: the badge shows the score from our latest test.

[![QAmcp score](https://qamcp.dev/s/com-allthepossibles-preflight.svg)](https://qamcp.dev/s/com-allthepossibles-preflight.html)

Score over time

30 Oct 202683

One test so far. New tests will show here.

Reviews

Coming soon: reviews from people who use Preflight, signed in with GitHub, one per person. Reviews never change the score.

Is this your server? Get an alert the moment it breaks.

QAmcp Monitor (coming soon) tests it every hour and emails you when it goes down, the score drops, a tool changes or a secret leaks. You'll also be able to claim this page and get a verified owner mark. Founding price: $19/month for life for the first 50 teams.

Have a concern, or want it removed? Ask us and we'll take it off the list. How the directory works