QAmcp

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Directory / Deadbolt

Deadbolt

Q: Is Deadbolt MCP server safe?

QAmcp's test on 3 Nov 2026: None of the hidden-instruction wordings we know were found in its 2 tool descriptions. All 2 of its tools are labeled read-only. Overall it scored 95/100 on 3 Nov 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 deadbolt.clawhard.com · https://deadbolt.clawhard.com/mcp

Check Supabase SQL for who can read and write each table: RLS gaps, open policies, grants, fix SQL.

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

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95 /100

PASS · WITH NOTES

Partial: 10 of 12 checks · 3 Nov 2026

Test it now for current results

At a glance

Runs where: On their server. What you send to it goes to them.
What you need: Nothing: it answered without a login
Tools: 2 tools
Its own safety labels: 2 read-only
Memory it takes: About 660 tokens of your AI's memory, just for its tool descriptions
Largest answer: About 8 KB in our test
Speed: Average answer in our test: 67 ms

Tokens are an estimate: the characters in its tool names, descriptions and inputs, divided by 4. The exact number depends on your AI model. Safety labels are what the server says about itself. From our latest test, 3 Nov 2026.

Is Deadbolt MCP server safe?

None of the hidden-instruction wordings we know were found in its 2 tool descriptions.
All 2 of its tools are labeled read-only.
Overall it scored 95/100 on 3 Nov 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 this test does not check

Its source code and packages.
What a tool quietly does behind the scenes, such as writing a file or calling another service.
Instructions hidden inside live tool answers. We only look for those in tool descriptions.
Hidden instructions worded in a way our list doesn't know yet.
Tools that could change something. Those are read, never run.

What QAmcp can and can't see · How to tell if an MCP server is safe · Hidden instructions · Prompt injection

Known security advisories

It lists no public code, so there is nothing to look up in GitHub Security Advisories or OSV.dev. QAmcp tests how a server behaves. It does not scan source code.

What it can do

2 tools, in the server's own words.

deadbolt_check_supabase_accessread-only

Use when you write, review or are about to apply Supabase / PostgreSQL migration SQL (CREATE TABLE, RLS, CREATE POLICY, GRANT, views, SECURITY DEFINER function…

deadbolt_catalog_queryread-only

Use when you need to check a live Supabase project rather than migration files: returns a read-only SQL query that reads table RLS settings, grants for anon an…

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 (2025-11-25). It works today, but it isn't on the July 2026 version (2026-07-28) yet.
note
!
Follows MCP best practices (not scored yet)
1 tip (not scored)
- !deadbolt_check_supabase_access: Labeled read-only, but it takes a raw "sql" input. A read-only label can't promise much when the tool runs whatever it's sent; make the tool itself refuse changes (for example with a read-only database user), or drop the label. QAmcp doesn'
note
✓
ConnectsConnected in 428 ms
pass
✓
Lists its toolsFound 2 tools
pass
✓
Every tool is describedAll 2 tools and their inputs are described
pass
✓
Tools are labeled safe or dangerousEvery tool has a safety label
pass
✓
No known hidden instructionsNone of the hidden-instruction wordings we know were found in tool descriptions. New wordings can get past this check.
pass
✓
Tools work with good inputs
All good
- ✓deadbolt_catalog_query: Worked (67 ms)
- –deadbolt_check_supabase_access: Not run: labeled read-only, but it takes a raw "sql" input, so what it does depends on what it's sent. Skipped to be safe: if you own this server, test again with --owner
pass
✓
Fast enough
All good
- ✓Connecting took 428 ms
- ✓Listing tools took 67 ms
- ✓Average tool answer: 67 ms
- ✓deadbolt_catalog_query: Slowest tool: deadbolt_catalog_query (67 ms)
pass
✓
Resources and prompts work
All good (2 resources, 1 prompt)
- ✓Opened 2 of 2 resources
- ✓An address that does not exist gets a clean "not found" error
- ✓Opened 1 of 1 prompts
pass
–
Bad inputs give a clean errorNot tested
not tested
–
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
–
No secrets leakedNo error messages to check
not tested

Test it yourself

Free and open source. Same checks, same score.

npx qamcp-cli https://deadbolt.clawhard.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-clawhard-deadbolt.svg)](https://qamcp.dev/s/com-clawhard-deadbolt.html)

Score over time

3 Nov 202695

One test so far. New tests will show here.

Reviews

Coming soon: reviews from people who use Deadbolt, 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 tests it every hour and emails you when it goes down, the score drops, a tool changes or a secret leaks. Free for 1 server, no card.

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