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

Annotations already establish read-only, idempotent, non-destructive, open-world behavior, so the bar is lower, and the description adds genuinely new context: indexed docs versus upstream tags are distinguished, and upstream tags may lack usable documentation. That caveat materially affects how an agent interprets results. It stops short of describing response shape or ordering.

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?

Four compact sentences with the default behavior front-loaded and no filler. The telegraphic style ('Default: representative version preview') is efficient, though the density makes the mode-switch slightly harder to parse than plain prose would be.

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?

For a read-only list tool with no output schema, annotations cover safety and the description covers the preview-versus-paginated distinction and the docs/tag caveat. Still missing are any explanation of includePrerelease and any hint about result ordering or size, which an agent deciding how to paginate would want.

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 0%, so the description must carry parameter meaning. It explains limit/offset as a pagination pair that switches from preview to individual stable release tags (including patch versions), which adds real value. But includePrerelease goes entirely unexplained in both schema and description, and libraryId is undescribed, leaving one of four parameters undocumented.

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 specifies the resource (library versions) and the two operating modes: a representative preview by default, and a paginated listing of individual stable GitHub release tags. It is clear what the tool returns, though it never names or contrasts with siblings like resolve-library-id or query-docs, so differentiation is left to the agent.

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?

It gives one useful conditional: use the default for a preview, supply limit/offset to paginate the full stable tag list. However, it says nothing about prerequisites (e.g., resolving a libraryId first) or when to prefer a sibling tool such as fetch or search, so usage guidance is only partially implied.

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