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

Annotations already cover the safety profile (readOnlyHint, idempotentHint, destructiveHint=false, openWorldHint), which is the heavy lifting. The description adds valuable return-content context – that deprecation status, a release-notes link, vendor, and an optional migration guide come back – but says nothing about caching, rate limits, or behavior when a package is unknown.

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?

A single front-loaded sentence with no padding. It is a field list rather than a sentence about the action, but every clause conveys a real return dimension.

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?

With no output schema, the description carries the burden of describing the return shape, and it does name the key fields an agent would want. It doesn't specify version format or error behavior for unknown packages, but it is sufficient for this simple two-parameter lookup.

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 both parameters documented and examples given for 'package' and an enum for 'ecosystem'. The description adds no syntax or format detail beyond the schema, so the baseline 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?

States the specific resource (latest version of an npm/PyPI package) and enumerates the accompanying fields: deprecation flag, release-notes link, API vendor, and migration guide. Clear enough to select, but it does not contrast itself with siblings like get_migration_guide or list_migration_guides, so an agent must infer the boundary.

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?

There is no explicit when-to-use statement, no prerequisites, and no named alternative. An agent can only infer that this is the lookup for version/deprecation status rather than migration guides or dependency checks.

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