Skills/npm/bestax-mcp

bestax-mcp@1.18.49

VERIFIED

Publisher claims: "MCP server for @allxsmith/bestax-bulma — component props, examples, CSS variables and agent skills, served offline from a version-pinned index" Observed in sandbox: no network, touches nothing outside the project, writes no memory.

Registry npm (MCP server)Publisher allxsmith · publishing for 94 daysInstalls 14,028Last detonated 4d ago
$claude mcp add bestax-mcp -- npx -y bestax-mcp
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Coverage

Server started and answered tools/list.
Tested
MCP initialize and tools/list · every tool description, for hidden instructions · every file read, file written and host contacted by what ran
Not tested
what the tools do when called with real credentials

Before you give it your token

It will ask for
no credential variables read in the code
Where it talks to
bestax.io (its own)
What the honeypot saw
no credential files read · no network
What we could not test
what the tools do when called with real credentials

Reasonable to connect. No credential asked for, no third-party host named, Server started and answered tools/list.

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) on 2026-11-11 and scored it 87/100 (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 · 32 s · 2 scenarios · 0 deviations
t+CategoryObserved action
0.0sprocessno install scripts in bundle
12sprocessdependency install exit 0
32sclaimed10 tools: search_bestax, list_components, get_component, get_props, get_examples, get_css_variables, get_helper_props, lookup_bulma_classes, list_skills, get_skill
32sprocessscript backend runs setup only
32sprocessno install scripts to re-run

Static findings

MEDIUM
npx invocation of non-well-known packagedist/bulma-classes.js:918 · npx invocation of non-well-known package — may execute untrusted code'children and file. To convert a codebase, `npx bestax-migrate bulma-classes src/` ' +Fix: Pin versions and sources; vendor anything fetched at install time.
AST06
LOW
Text pushed off-screen by whitespacedata/components/Portal.json:72 · Text pushed off-screen by whitespace · informational: not an instruction file|\n| ----------- | ------------------------- | ------------------------------------------------------------ | --------------------------------------------------Fix: Remove the text that addresses the agent rather than the reader; describe behavior, do not instruct.
AST01
MEDIUM
File type combined with upload actiondata/components/File.json:50 · File type combined with upload action — agent may exfiltrate local data files… "code": "<>\n <File\n size=\"small\"\n hasName\n fileName=\"sample.txt\"\n buttonLabel=\"Choose a file…\"\n iconLeft={<Icon name=\"upload\" aria-hidden=\"true\" />}\n />\n <File\n hasName\n fileName=\"sample.txt\"\n buttonLabel=\"Choose a…Fix: Remove the call, or declare the host in frontmatter and explain in the README what is sent and why.
AST07
MEDIUM
npx invocation of non-well-known packagepackage.json:69 · npx invocation of non-well-known package — may execute untrusted code…s that install from it.\n\n### Claude Code\n\n```bash\nclaude mcp add bestax -- npx -y bestax-mcp@1\n```\n\nOr install the [`bestax` plugin](https://github.com/allxsm…Fix: Pin versions and sources; vendor anything fetched at install time.
AST06
MEDIUM
npx invocation of non-well-known packagepackage.json:67 · npx invocation of non-well-known package — may execute untrusted code"release": "npx semantic-release"Fix: Pin versions and sources; vendor anything fetched at install time.
AST06
MEDIUM
File type combined with upload actionpackage.json:69 · File type combined with upload action — agent may exfiltrate local data files… Cursor, Claude Desktop, Windsurf, Cline\n\nAdd to your MCP config (`.cursor/mcp.json`, `claude_desktop_config.json`, …):\n\n```json\n{\n \"mcpServers\": {\n \"bestax\": {\n \"command\": \"npx\",\n \"args\": [\"-y\", \"bestax-mcp@1\"]\n }\…Fix: Remove the call, or declare the host in frontmatter and explain in the README what is sent and why.
AST07
MEDIUM
MCP server using network transport (SSE/HTTP)package.json:69 · MCP server using network transport (SSE/HTTP) — data sent over network…onfig (`.cursor/mcp.json`, `claude_desktop_config.json`, …):\n\n```json\n{\n \"mcpServers\": {\n \"bestax\": {\n \"command\": \"npx\",\n \"args\": [\"-y\", \"bestax-mcp@1\"]\n }\n }\n}\n```\n\nThe server checks your installed `@allxsmith/b…Fix: Namespace tool names and keep tool descriptions literal; no instructions to the agent inside them.
AST04
LOW
Text pushed off-screen by whitespacedata/components/Theme.json:474 · Text pushed off-screen by whitespace · informational: not an instruction file|\n| ----------- | ------------------------------------------------------------- | -----------------------------------------------------------------------------Fix: Remove the text that addresses the agent rather than the reader; describe behavior, do not instruct.
AST01

Cost to the agent

Instructions loaded
≈71 tok
1 file · 81 in bundle
Tool list per prompt
≈1,306 tok
10 tools · 131 per tool
Handshake
423 ms
launch to tools/list, stdio
Undocumented tools
0
description under 20 chars · avg 187

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

No advisories in OSV for bestax-mcp@1.18.49 as of 3d ago. This is the package itself, not its dependencies.