Skills/npm/mcp-server

mcp-server@0.0.0-build-28af6d3-20261110230627

VERIFIED· startup only

Publisher claims: "MCP server for an API definition: streamable HTTP (stateful or stateless) and stdio" Observed in sandbox: no network, touches nothing outside the project, writes no memory.

Registry npm (MCP server)Publisher xyd-js · publishing for 410 daysInstalls 5,129Last detonated 3d ago
$claude mcp add mcp-server -- npx -y @xyd-js/mcp-server
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Coverage

Startup only; authenticated tool behavior not tested.
Tested
server startup over stdio (initialize sent) · every file read, file written and host contacted by what ran
Not tested
the tool list (the server exited before answering) · what the tools do when called with real credentials
Needs
OPENAI_API_KEY, XYD_API_TOKEN — give it to the server where it runs, through vet-skills run --secrets, so the value never enters the server's environment. Never paste a credential into a chat, a ticket or a report.

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
DEFAULT_TOKEN_ENVOPENAI_API_KEY
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
the tool list (the server exited before answering) · what the tools do when called with real credentials

Connect it with a scoped credential, under the guard. It asks for DEFAULT_TOKEN_ENV, OPENAI_API_KEY and talks to its vendor. Give the credential to the guard, not the server: the value never enters the server's environment and only travels to the host you bind. What the tools do with a real credential was not observed.

$vet-skills run --net declared -- npx -y @xyd-js/mcp-server

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; startup only; authenticated tool behavior not tested) on 2026-11-11 and scored it 92/100 (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 (it asks for OPENAI_API_KEY, XYD_API_TOKEN); 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 · 75 s · 2 scenarios · 0 deviations
t+CategoryObserved action
0.0sprocessno install scripts in bundle
34sprocessdependency install exit 0
54sprocessrelaunched with a decoy OPENAI_API_KEY, XYD_API_TOKEN (tagged; nothing real)
74sclaimedstartup only: exited before answering, asking for OPENAI_API_KEY, XYD_API_TOKEN (a decoy value was refused)
74sprocessscript backend runs setup only
74sprocessno install scripts to re-run

Static findings

MEDIUM
MCP server using network transport (SSE/HTTP)dist/http.d.ts:72 · MCP server using network transport (SSE/HTTP) — data sent over networkconstructor(prepared: PreparedMcpServer, options?: Pick<McpHttpOptions, "sessionIdleMs" | "maxSessions">);Fix: Namespace tool names and keep tool descriptions literal; no instructions to the agent inside them.
AST04
MEDIUM
MCP server using network transport (SSE/HTTP)dist/cli.d.ts:28 · MCP server using network transport (SSE/HTTP) — data sent over network/** Runs the command line: `xyd-mcp-server [http|stdio] <source> [llms-source] [options]`. */Fix: Namespace tool names and keep tool descriptions literal; no instructions to the agent inside them.
AST04
MEDIUM
MCP server using network transport (SSE/HTTP)dist/http.d.ts:46 · MCP server using network transport (SSE/HTTP) — data sent over networkexport declare function createMcpHttpApp(prepared: PreparedMcpServer, options?: McpHttpOptions): express.Express;Fix: Namespace tool names and keep tool descriptions literal; no instructions to the agent inside them.
AST04
MEDIUM
MCP server using network transport (SSE/HTTP)dist/chunk-G6OLJU2G.js:36 · MCP server using network transport (SSE/HTTP) — data sent over networkxyd-mcp-server [http] <source> [llms-source] [options] serve over streamable HTTPFix: Namespace tool names and keep tool descriptions literal; no instructions to the agent inside them.
AST04

Cost to the agent

Instructions loaded
≈72 tok
1 file · 18 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

No advisories in OSV for @xyd-js/mcp-server@0.0.0-build-28af6d3-20261110230627 as of 3d ago. This is the package itself, not its dependencies.