Skills/npm/cds-mcp-server

cds-mcp-server@9.30.1

VERIFIED

Publisher claims: "Coinbase Design System - MCP Server" Observed in sandbox: calls api.developer.coinbase.com only, touches nothing outside the project, writes no memory.

Registry npm (MCP server)Publisher coinbase · publishing for 410 daysInstalls 15,584Last detonated 4d ago
$claude mcp add cds-mcp-server -- npx -y @coinbase/cds-mcp-server
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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
coinbase.com (its own)
What the honeypot saw
no credential files read · reached only api.developer.coinbase.com (its own)
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 93/100 (Verified). It did what it claims and nothing else we could detect: no undeclared network egress, no credential reads, no persistent instruction writes. Summary: calls api.developer.coinbase.com only, touches nothing outside the project, writes no memory.

Behavior trace

Honeypot run · 27 s · 2 scenarios · 0 deviations
t+CategoryObserved action
0.0sprocessno install scripts in bundle
6.8sprocessdependency install exit 0
27snetworkCONNECT tcp://api.developer.coinbase.com:443
27sclaimed2 tools: list-cds-routes, get-cds-doc
27sprocessscript backend runs setup only
27sprocessno install scripts to re-run

Static findings

MEDIUM
File type combined with upload actionesm/setup.js:101 · File type combined with upload action — agent may exfiltrate local data filesconsole.log("\u2705 Copied CDS rules to ".concat(outputFile));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 actionesm/setup.js:85 · File type combined with upload action — agent may exfiltrate local data filesconsole.log("\u2705 Copied CDS rules to ".concat(outputFile));Fix: Remove the call, or declare the host in frontmatter and explain in the README what is sent and why.
AST07
LOW
Instructs the agent to modify its persistent memory or instruction filesesm/setup.js:103 · Instructs the agent to modify its persistent memory or instruction files · informational: not an instruction file// Update or create CLAUDE.md with reference to the rules fileFix: Remove the text that addresses the agent rather than the reader; describe behavior, do not instruct.
AST01

Cost to the agent

Instructions loaded
≈49 tok
1 file · 81 in bundle
Tool list per prompt
≈208 tok
2 tools · 104 per tool
Handshake
332 ms
launch to tools/list, stdio
Undocumented tools
0
description under 20 chars · avg 49

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 @coinbase/cds-mcp-server@9.30.1 as of 4d ago. This is the package itself, not its dependencies.