Is longrun-mcp-proxy@1.7.3 safe to install?

Skills/PyPI/longrun-mcp-proxy

longrun-mcp-proxy@1.7.3

VERIFIED

Publisher claims: "MCP proxy with async wrapper for long-running tools and persistent SSE mode" Observed in sandbox: no network, touches nothing outside the project, writes no memory.

Registry PyPI (MCP server)Publisher pypi · joined 11 days agoInstalls 53Last detonated 2 h ago

$claude mcp add longrun-mcp-proxy -- uvx longrun-mcp-proxy

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KillerSkills ran it in the KillerSkills honeypot sandbox (2 scenarios) on 2026-11-06 and scored it 81/100 (Verified). It did what it claims and nothing else we could detect: no undeclared network egress, no credential reads, no persistent instruction writes. 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

0.1sprocessexec /usr/bin/date

0.1sprocessexec /usr/bin/timeout

0.1sprocessexec .venv/bin/longrun-mcp-proxy

0.1sclaimedno tools/list reply (exit 0)

0.1sprocessscript backend runs setup only

0.2sprocessno install scripts to re-run

Static findings

MEDIUM

npx invocation of non-well-known packagesrc/longrun_mcp_proxy/proxy_stdio.py:12 · npx invocation of non-well-known package — may execute untrusted codeFix: Pin versions and sources; vendor anything fetched at install time.

AST06

MEDIUM

npx invocation of non-well-known packagesrc/longrun_mcp_proxy/cli.py:11 · npx invocation of non-well-known package — may execute untrusted codeFix: Pin versions and sources; vendor anything fetched at install time.

AST06

MEDIUM

Python subprocess execution detectedsrc/longrun_mcp_proxy/extras/xcode_approver.py:64 · Python subprocess execution detectedFix: Build commands from fixed arguments, never from interpolated strings; prefer an API client over shelling out.

AST05

MEDIUM

Python subprocess execution detectedsrc/longrun_mcp_proxy/xcresult_recovery.py:48 · Python subprocess execution detectedFix: Build commands from fixed arguments, never from interpolated strings; prefer an API client over shelling out.

AST05

MEDIUM

Python subprocess execution detectedsrc/longrun_mcp_proxy/extras/xcode_defaults.py:52 · Python subprocess execution detectedFix: Build commands from fixed arguments, never from interpolated strings; prefer an API client over shelling out.

AST05

Cost to the agent

Instructions loaded

≈58 tok

1 file · 33 in bundle

Tool list per prompt

≈0 tok

0 tools · 0 per tool

Handshake

no reply

launch to tools/list, stdio

Undocumented tools

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.