Fetch Library Changelog

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

Annotations already declare readOnlyHint=true, destructiveHint=false, idempotentHint=true, openWorldHint=true. The description adds value by detailing the order of sources (GitHub Releases API first, then CHANGELOG.md, then docs site), which is beyond what annotations provide.

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 two paragraphs with three efficient sentences. It front-loads the purpose, then explains sources, then gives usage guidance, and ends with clear alternative. No superfluous content.

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 has 3 parameters (1 required) and no output schema, the description covers purpose, usage, and behavioral details. It could mention the return format (changelog content) but the annotations and simplicity make it adequately complete.

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%, so baseline is 3. The description does not add extra meaning beyond what the schema already provides for each parameter. It does not repeat schema info, which is appropriate, but also offers no additional guidance on parameter usage.

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 'Fetch recent release notes and changelog for a library' with specific verb 'fetch' and resource 'changelog'. It also lists the sources (GitHub Releases, CHANGELOG.md, docs site), distinguishing it from siblings like gt_migration which targets upgrade guides.

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?

Explicitly provides when to use: 'Use before upgrading' and 'for "what changed in version X" questions'. Clearly contrasts with gt_migration: 'For "how do I upgrade my code from vA to vB" — use gt_migration instead'.

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