NPM Sentinel MCP

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

Annotations already indicate this is a read-only, open-world, and idempotent operation, covering safety and reliability. The description adds value by specifying the tool checks compatibility 'between multiple packages,' which clarifies the scope beyond what annotations provide. However, it doesn't detail behavioral aspects like rate limits, error handling, or output format.

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?

The description is a single, efficient sentence that directly states the tool's purpose without any redundant information. It is front-loaded and appropriately sized, making it easy for an AI agent to quickly understand the core functionality.

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?

Given the tool's moderate complexity (license compatibility check), annotations cover safety and reliability well, but there is no output schema to explain return values. The description is minimal and doesn't address potential outputs, error cases, or detailed usage context, leaving gaps for an AI agent to fully leverage the tool effectively.

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%, with the 'packages' parameter clearly documented as a list of package names. The description adds minimal semantics by mentioning 'multiple packages,' aligning with the array parameter, but doesn't provide additional context like package format examples or compatibility criteria beyond what the schema already covers.

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 specific action ('Check license compatibility') and the resource ('between multiple packages'), using a precise verb. It distinguishes this tool from all sibling tools, which focus on different aspects like alternatives, vulnerabilities, or trends rather than license compatibility analysis.

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?

The description implies usage when needing to verify license compatibility among packages, but provides no explicit guidance on when to use this tool versus alternatives (e.g., other npm tools for different purposes) or any exclusions. It lacks context about prerequisites or specific scenarios where this check is most relevant.

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