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The Stall

The Stall

by thebrierfox
OverviewSchemaSourceRelated ServersDiscussionsAdmin
JavaScript
Remote

npm-lookup

Retrieve npm package metadata such as version, license, dependencies, and download statistics to verify package maintenance and assess risk before adding it as a dependency.

Instructions

Node.js / JavaScript package metadata from the npm registry. Returns latest version, description, license, keywords, direct dependencies, weekly download count, publish date, GitHub repository, and all recent versions. Also supports looking up a specific version. Use before adding an npm package as a dependency: verify it's maintained, check its license, assess how many dependencies it pulls in. Free upstream: npm registry API (no key, public).

Tool call template

This tool declares no required parameters. Add optional parameters from the input schema as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {},
    "name": "npm-lookup"
  }
}

Input Schema

NameRequiredDescriptionDefault
packageNonpm package name (e.g. 'express', 'react', '@anthropic-ai/sdk'). Scoped packages like '@scope/name' are supported.
versionNoSpecific version to look up (e.g. '4.18.2'). Defaults to latest stable.

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv1.0.0

TDQS

A4.3/5.0
Behavior4/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

No annotations provided, so description carries full burden. It discloses free upstream (no key, public), lists return fields (version, description, etc.), and mentions specific version lookup. Lacks details on rate limits or response size, but adequate for a read-only query tool.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Three sentences: purpose and return fields, usage guidance, and upstream info. No redundancy, front-loaded with key action. Every sentence adds value.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness5/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

No output schema, but description enumerates all return items (version, description, license, etc.) and mentions specific version support. Complete for a simple query tool with good parameter coverage.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema coverage is 100% with clear parameter descriptions. The description adds 'Also supports looking up a specific version' but doesn't provide new semantics beyond the schema. Baseline score of 3 is appropriate.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the tool retrieves Node.js/JavaScript package metadata from npm registry, listing specific fields like version, description, license, etc. It differentiates from siblings like pypi-lookup by explicitly targeting npm packages.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines4/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description provides explicit use case: 'Use before adding an npm package as a dependency'. It does not mention when not to use, but the context is clear for npm dependency evaluation.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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