Is langbot-mcp@0.3.0 safe to install?

langbot-mcp@0.3.0

VERIFIED

Publisher claims: "Langbot MCP server: every market on Kalshi and Polymarket, its history and replays against recorded order books, for Claude Code, Cursor, Claude Desktop and Codex." Observed in sandbox: no network, touches nothing outside the project, writes no memory.

Registry PyPI (MCP server)Publisher langbot-hello · joined 0 days agoInstalls 0Last detonated 2 h ago

$claude mcp add langbot-mcp -- uvx langbot-mcp

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KillerSkills ran it in the KillerSkills honeypot sandbox (2 scenarios) on 2026-11-05 and scored it 83/100 (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

0.2sprocessexec /usr/bin/date

0.2sprocessexec /usr/bin/timeout

0.2sprocessexec .venv/bin/langbot-mcp

0.2sclaimedno tools/list reply (exit 0)

0.2sprocessscript backend runs setup only

Static findings

HIGH

Outbound HTTP to raw IP addresssrc/langbot_mcp/server.py:69 · Outbound HTTP to raw IP address — may bypass domain-based monitoringFix: Replace encoded or assembled strings with plain literals and remove undeclared network calls.

AST07

MEDIUM

URL using raw IP addresssrc/langbot_mcp/server.py:69 · URL using raw IP address — may bypass domain-based filteringFix: Replace encoded or assembled strings with plain literals and remove undeclared network calls.

AST07

Cost to the agent

Instructions loaded

≈77 tok

1 file · 9 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.