Skills/PyPI/mcp-gatehouse

mcp-gatehouse@0.6.0

VERIFIED· not started

Publisher claims: "Authorization as a runtime invariant for MCP servers: caller, policy and a decision on the record, checked in the server before every tool runs. Tiers, approval gates and an audit log around it." Observed in sandbox: no network, touches nothing outside the project, writes no memory.

Registry PyPI (MCP server)Publisher nickgeorgeseo · publishing for 125 daysInstalls 534Last detonated 25 min ago
$claude mcp add mcp-gatehouse -- uvx mcp-gatehouse
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Coverage

Not started: dependency install failed; the server itself was not observed.
Tested
the dependency install step · every file read, file written and host contacted by what ran
Not tested
server startup · the tool list · tool behavior

What this means for the label: Verified here covers what ran. The server's tools were not exercised with a real credential, so nothing about their behavior is asserted; the credential summary below says what to do with that.

Before you give it your token

It will ask for
no credential variables read in the code
Where it talks to
no vendor host named in the code
What the honeypot saw
no credential files read · no network
What we could not test
server startup · the tool list · tool behavior

Connect it under the guard. Not started: dependency install failed; the server itself was not observed. The code names no credential variable; the guard pins the network to what the honeypot saw and logs every call.

$vet-skills run --net declared -- uvx mcp-gatehouse

Never paste a credential into a chat, a ticket or a report, including ours. How the guard holds it.

Is [email protected] safe to install?

KillerSkills ran it in the KillerSkills honeypot sandbox (2 scenarios; not started: dependency install failed; the server itself was not observed) on 2026-11-15 and scored it 80/100 (Verified). In what ran, nothing we could detect went wrong: no undeclared network egress, no credential reads, no persistent instruction writes. What it does with a real credential was not observed; the static findings and the publisher carry the rest of the score. Summary: no network, touches nothing outside the project, writes no memory.

Behavior trace

Honeypot run · 0 s · 2 scenarios · 0 deviations
t+CategoryObserved action
0.0sprocessno install scripts in bundle
0.1sprocessdependency install exit 1 ·
0.1sclaimednot started: dependency install failed (exit 1); the server itself was not observed
0.1sprocessscript backend runs setup only
0.1sprocessno install scripts to re-run

Static findings

MEDIUM
Python subprocess execution detectedtests/test_buffered_sink.py:338 · Python subprocess execution detectedproc = subprocess.Popen([sys.executable, "-c", script, str(path)], stdout=subprocess.PIPE, stderr=subprocess.PIPE,Fix: Build commands from fixed arguments, never from interpolated strings; prefer an API client over shelling out.
AST05
MEDIUM
Python subprocess execution detectedtests/test_approval_load.py:510 · Python subprocess execution detectedshown = subprocess.run(Fix: Build commands from fixed arguments, never from interpolated strings; prefer an API client over shelling out.
AST05
MEDIUM
Bidirectional text override characters detectedtests/test_approver_answers.py:82 · Bidirectional text override characters detected — may hide content directionbad = [c for c in msg if c in "

\u0085‮\u009b"]Fix: Replace encoded or assembled strings with plain literals and remove undeclared network calls.
AST07
MEDIUM
Python subprocess execution detectedtests/test_approval_store.py:205 · Python subprocess execution detectedprocs = [subprocess.Popen(command, stdout=subprocess.PIPE, stderr=subprocess.PIPE, text=True) for _ in range(2)]Fix: Build commands from fixed arguments, never from interpolated strings; prefer an API client over shelling out.
AST05
MEDIUM
Python subprocess execution detectedtests/test_audit.py:62 · Python subprocess execution detectedrun = subprocess.run([sys.executable, "-c", _DISK_FILLS, str(path)], capture_output=True, text=True, check=True)Fix: Build commands from fixed arguments, never from interpolated strings; prefer an API client over shelling out.
AST05
MEDIUM
Python subprocess execution detectedtests/test_approval_store_postgres.py:124 · Python subprocess execution detectedprocs = [subprocess.Popen(command, stdout=subprocess.PIPE, stderr=subprocess.PIPE, text=True) for _ in range(2)]Fix: Build commands from fixed arguments, never from interpolated strings; prefer an API client over shelling out.
AST05
MEDIUM
Bidirectional text override characters detectedtests/test_caller.py:224 · Bidirectional text override characters detected — may hide content directionsneaky = Caller(client_id="app\x1b[2K\x7f", subject="mallory\r\x1b[1A‮\x9b")Fix: Replace encoded or assembled strings with plain literals and remove undeclared network calls.
AST07
MEDIUM
Python subprocess execution detectedtests/test_buffered_sink.py:264 · Python subprocess execution detectedproc = subprocess.Popen(Fix: Build commands from fixed arguments, never from interpolated strings; prefer an API client over shelling out.
AST05
MEDIUM
Bidirectional text override characters detectedtests/test_authorization.py:688 · Bidirectional text override characters detected — may hide content directionreason="over $500", resources=("order 4417\nApprove? yes", "‮evil"),Fix: Replace encoded or assembled strings with plain literals and remove undeclared network calls.
AST07
MEDIUM
Process kill commandtests/test_buffered_sink.py:290 · Process kill command — agent can terminate processesassert len(written) < 10 # the test did kill it mid-drainFix: Build commands from fixed arguments; do not interpolate untrusted strings into a shell.
AST05
MEDIUM
Python subprocess execution detectedtests/test_buffered_sink.py:190 · Python subprocess execution detecteddone = subprocess.run([sys.executable, "-c", script, str(out)], capture_output=True, text=True, timeout=30)Fix: Build commands from fixed arguments, never from interpolated strings; prefer an API client over shelling out.
AST05
HIGH
Image alt text carrying instructionsREADME.md:39 · Image alt text carrying instructionsClaude Code is asked to cancel order 4418; the server's approval form appears in Claude Code, naming who the call is for, the arguments, and the order as the seFix: Remove the text that addresses the agent rather than the reader; describe behavior, do not instruct.
AST01
MEDIUM
Python subprocess execution detectedtests/test_approval_load.py:482 · Python subprocess execution detectedCLIENT = "import subprocess, sys; subprocess.run([sys.executable, '-c', %r], start_new_session=%s, timeout=20)"Fix: Build commands from fixed arguments, never from interpolated strings; prefer an API client over shelling out.
AST05
MEDIUM
MCP server using network transport (SSE/HTTP)tests/test_authorization.py:1203 · MCP server using network transport (SSE/HTTP) — data sent over networkmcp = MCPServer("authz-http", token_verifier=Verifier(),Fix: Namespace tool names and keep tool descriptions literal; no instructions to the agent inside them.
AST04
MEDIUM
Bidirectional text override characters detectedtests/test_approver_answers.py:78 · Bidirectional text override characters detected — may hide content directionarguments={"order_id": "4417", "note": "x
on order 4418 · Piedmont Supply · $5.00
\u0085‮"},Fix: Replace encoded or assembled strings with plain literals and remove undeclared network calls.
AST07
MEDIUM
Python subprocess execution detectedtests/test_qol_030.py:262 · Python subprocess execution detectedout = subprocess.run(Fix: Build commands from fixed arguments, never from interpolated strings; prefer an API client over shelling out.
AST05
MEDIUM
Python subprocess execution detectedtests/test_qol_030.py:225 · Python subprocess execution detectedsubprocess.run(Fix: Build commands from fixed arguments, never from interpolated strings; prefer an API client over shelling out.
AST05
MEDIUM
Bidirectional text override characters detectedtests/test_caller.py:226 · Bidirectional text override characters detected — may hide content directionfor raw in ("\x1b", "\r", "‮", "\x9b", "\x7f"):Fix: Replace encoded or assembled strings with plain literals and remove undeclared network calls.
AST07

Cost to the agent

Instructions loaded
≈85 tok
1 file · 56 in bundle
Tool list per prompt
≈0 tok
0 tools · 0 per tool
Handshake
no reply
launch to tools/list, stdio
Undocumented tools
0
description under 20 chars · avg 0

Tokens estimated at four characters each. The tool list is re-read by the agent on every turn, so it is the number to compare between servers that do the same job: ranked across the index.

Known vulnerabilities

Not checked against OSV yet; the weekly check has not reached this version.