Skills/npm/mcp-gateway

mcp-gateway@17.0.5

CAUTION· not started

Publisher claims: "MCP gateway for AI models (OpenAI, Grok, DeepSeek, Claude and other function-calling LLMs) and for web pages and apps: one authenticated, observable endpoint in front of your MCP servers with routing, scopes, rate limits and metrics." Observed in sandbox: no network, touches nothing outside the project, writes no memory.

Registry npm (MCP server)Publisher winstonsayno · publishing for 38 daysInstalls 18,022Last detonated 8d ago
What would fix thisWatchDispute verdict

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: Caution 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

Code inventory arrives with this version's next honeypot run.
It will ask for
unknown until the next run
Where it talks to
unknown until the next run
What the honeypot saw
no credential files read · no network
What we could not test
server startup · the tool list · tool behavior

Not enough was observed to say yet. Not started: dependency install failed; the server itself was not observed. This version's code has not been inventoried for credentials and hosts either; both arrive with its next honeypot run (popular servers first). `vet-skills try mcp-gateway` runs it now and prints the full answer.

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 2026-11-06 and scored it 73/100 (Caution). It is not known to be malicious, but it has behaviour or code a security policy should decide on before install. Notable findings: Access to sensitive file paths; Auto-update or dynamic fetch configuration; URL with embedded credentials. Summary: no network, touches nothing outside the project, writes no memory.

Behavior trace

Honeypot run · 1 s · 2 scenarios · 0 deviations
t+CategoryObserved action
0.0sprocessno install scripts in bundle
0.8sprocessdependency install exit 1
1.0sprocessexec /usr/bin/date
1.0sprocessexec /usr/bin/timeout
1.0sclaimedno tools/list reply (exit 0)
1.0sprocessscript backend runs setup only
1.0sprocessno install scripts to re-run

Static findings

HIGH
Access to sensitive file pathsdist/config/gitops.js:361 · Access to sensitive file paths — SSH keys, AWS credentials, env files, or system filesconst env = typeof m?.env === 'string' ? m.env : '';Fix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
AST05
MEDIUM
File type combined with upload actiondist/cli.js:459 · File type combined with upload action — agent may exfiltrate local data filesconsole.log(`Written to ${options.output}`);Fix: Remove the call, or declare the host in frontmatter and explain in the README what is sent and why.
AST07
MEDIUM
File type combined with upload actiondist/cli.js:180 · File type combined with upload action — agent may exfiltrate local data filesconsole.log(`Created ${options.output}\n\nPoint your desktop client at the gateway instead of the individual servers:\n`);Fix: Remove the call, or declare the host in frontmatter and explain in the README what is sent and why.
AST07
HIGH
Auto-update or dynamic fetch configurationdist/gateway/api.d.ts:23 · Auto-update or dynamic fetch configuration — agent may load new code at runtime* Apply hot-reloadable settings from a new config: auth (strategy, keys,Fix: Pin versions and sources; vendor anything fetched at install time.
AST06
MEDIUM
File type combined with upload actiondist/gateway/api.js:996 · File type combined with upload action — agent may exfiltrate local data filesres.set('Content-Type', 'text/csv; charset=utf-8').set('Content-Disposition', 'attachment; filename="mcp-gateway-usage.csv"').send(usageCsv(rows, group));Fix: Remove the call, or declare the host in frontmatter and explain in the README what is sent and why.
AST07
MEDIUM
MCP server using network transport (SSE/HTTP)dist/cli.js:181 · MCP server using network transport (SSE/HTTP) — data sent over networkconsole.log(JSON.stringify({ mcpServers: { gateway: { url: `http://127.0.0.1:${port}/mcp`, headers: { Authorization: `Bearer ${apiKey}` } } } }, null, 2));Fix: Namespace tool names and keep tool descriptions literal; no instructions to the agent inside them.
AST04
MEDIUM
File type combined with upload actiondist/cli.js:133 · File type combined with upload action — agent may exfiltrate local data filesconsole.log(` 1. Edit ${options.output} to configure your MCP servers`);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 packagedist/config/loader.js:1589 · npx invocation of non-well-known package — may execute untrusted codecommand: npxFix: Pin versions and sources; vendor anything fetched at install time.
AST06
MEDIUM
File type combined with upload actiondist/cli.js:182 · File type combined with upload action — agent may exfiltrate local data filesconsole.log(`\nThen run: mcp-gateway start -c ${options.output}\n`);Fix: Remove the call, or declare the host in frontmatter and explain in the README what is sent and why.
AST07
MEDIUM
File type combined with upload actiondist/features/k8s.js:238 · File type combined with upload action — agent may exfiltrate local data filesres.json({ items: manifests, notes: ['auth.apiKeys are not rendered: put them in a Secret (MCP_GATEWAY_API_KEYS) and pass ?secret=<name>'] });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 packagedist/config/loader.js:1598 · npx invocation of non-well-known package — may execute untrusted codecommand: npxFix: Pin versions and sources; vendor anything fetched at install time.
AST06
HIGH
URL with embedded credentialsdist/config/diff.js:34 · URL with embedded credentials — may be phishing or credential leaking// 10.2: credentials in URLs (`https://user:pass@…`, `?token=…`) — the whole URL is masked so a GET → PUT round trip restores it.Fix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
AST07
MEDIUM
File type combined with upload actiondist/cli.js:389 · File type combined with upload action — agent may exfiltrate local data filesconsole.log('\nGive the key to the client; put the hash in auth.apiKeys. The key is not shown again.');Fix: Remove the call, or declare the host in frontmatter and explain in the README what is sent and why.
AST07
HIGH
Access to sensitive file pathsdist/catalog/index.js:202 · Access to sensitive file paths — SSH keys, AWS credentials, env files, or system filescfg.env = { ...(t.env ?? {}), ...env };Fix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
AST05
MEDIUM
npx invocation of non-well-known packagedist/catalog/index.js:18 · npx invocation of non-well-known package — may execute untrusted codeconst npx = (pkg, ...extra) => ({Fix: Pin versions and sources; vendor anything fetched at install time.
AST06
MEDIUM
File type combined with upload actiondist/gateway/api.js:280 · File type combined with upload action — agent may exfiltrate local data filesres.status(403).json({ error: 'Forbidden', message: 'Scoped clients cannot read the security posture' });Fix: Remove the call, or declare the host in frontmatter and explain in the README what is sent and why.
AST07
HIGH
Auto-update or dynamic fetch configurationdist/mcp/endpoint.js:161 · Auto-update or dynamic fetch configuration — agent may load new code at runtime/** Apply hot-reloadable settings (everything except `enabled` and `path`). */Fix: Pin versions and sources; vendor anything fetched at install time.
AST06
MEDIUM
File type combined with upload actiondist/mcp/endpoint.js:387 · File type combined with upload action — agent may exfiltrate local data filesres.status(400).json(rpcError(null, { code: JSONRPC_INVALID_REQUEST, message: `Invalid Request: MCP ${MODERN_PROTOCOL_VERSION} takes one JSON-RPC message per POST` }));Fix: Remove the call, or declare the host in frontmatter and explain in the README what is sent and why.
AST07
MEDIUM
File type combined with upload actiondist/mcp/endpoint.js:392 · File type combined with upload action — agent may exfiltrate local data filesres.status(400).json(rpcError(msg.id, { code: JSONRPC_INVALID_REQUEST, message: `Invalid Request: clients do not send responses in MCP ${MODERN_PROTOCOL_VERSION}` }));Fix: Remove the call, or declare the host in frontmatter and explain in the README what is sent and why.
AST07

Cost to the agent

Instructions loaded
≈98 tok
1 file · 81 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 @winstonsayno/mcp-gateway@17.0.5 as of 8d ago. This is the package itself, not its dependencies.

What would make this Verified

7 points to 80 · weights: behavior 45%, static 25%, prompt 15%, publisher 15%
  1. Unclaimed publisher≈ +8 on the totalClaim winstonsayno: a verified publisher gets +50 on publisher trust. It is free and usually instant with GitHub sign-in.
  2. Access to sensitive file paths≈ +4 on the totalStop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
  3. Auto-update or dynamic fetch configuration≈ +4 on the totalPin versions and sources; vendor anything fetched at install time.
  4. URL with embedded credentials≈ +4 on the totalStop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
  5. File type combined with upload action≈ +2 on the totalRemove the call, or declare the host in frontmatter and explain in the README what is sent and why.
  6. MCP server using network transport (SSE/HTTP)≈ +2 on the totalNamespace tool names and keep tool descriptions literal; no instructions to the agent inside them.
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