Evaluate multiple NPM packages side-by-side using various metrics to identify the best fit for your project.
Compare multiple NPM packages based on various metrics
| Name | Required | Description | Default |
|---|---|---|---|
| packages | Yes | List of package names to compare | |
| ignoreCache | No | Force a fresh lookup, ignoring the cache |
| Name | Required | Description | Default |
|---|---|---|---|
| message | No | ||
| results | No | ||
| queryPackages | No |
Changes observed during successful MCP inspections.
v1.24.0v1.23.0v1.20.0Input schema / additionalPropertiesRemoved value: -falseInput schema / properties / ignoreCacheAdded value: +{
+ "description": "Force a fresh lookup, ignoring the cache",
+ "type": "boolean"
+}v1.0.0Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint, openWorldHint, and idempotentHint, so the safety profile is clear. The description adds minimal behavioral context beyond 'compare', which is adequate given the annotations.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Is the description appropriately sized, front-loaded, and free of redundancy?
Single sentence with no wasted words. Highly concise and front-loaded, stating the core purpose immediately.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
While the tool is simple and has an output schema, the description lacks detail on what exactly is compared (e.g., version, size, vulnerabilities). Given low complexity and presence of output schema, it is minimally complete but could be more informative.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema description coverage is 100% for both parameters (packages and ignoreCache). The description does not add additional meaning beyond the schema, so baseline score of 3 applies.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Does the description clearly state what the tool does and how it differs from similar tools?
The description clearly states the tool compares multiple NPM packages, which is a specific verb+resource. It distinguishes from sibling tools like npmSize or npmVersions that focus on single metrics, but 'various metrics' is somewhat vague.
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
Does the description explain when to use this tool, when not to, or what alternatives exist?
No explicit guidance on when to use this tool vs alternatives. The description implies use for comparison but provides no scenarios or exclusions, leaving the agent to infer usage.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.