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

Annotations already declare readOnlyHint=true and openWorldHint=true, so the safety profile is covered. The description adds the useful detail that the feed returns every update with per-update fields, but says nothing about pagination, rate limits, or whether a private/canceled campaign is fetchable.

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?

Two tight sentences: the purpose and the full field list come first, then the parameter mapping. No filler, though the field enumeration could be considered slightly verbose given an output schema exists.

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 both parameters documented and an output schema present, the description covers what an agent needs to call it correctly; the only gap is the absence of sibling differentiation among kickstarter_project, kickstarter_comments, and kickstarter_discover.

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%, and the schema itself already carries the identical URL-segment example (lookingglass/musubi). The description therefore adds no meaning 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 a specific verb and resource: 'Get one Kickstarter campaign's full updates feed', and enumerates the returned fields. It is clearly distinguishable from kickstarter_project and kickstarter_comments by the 'updates feed' framing, though it never names those siblings explicitly.

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?

Usage is implied — you fetch the update feed for a campaign whose creator and slug you already know. There is no explicit when-to-use guidance, no statement of when to prefer kickstarter_comments or kickstarter_project instead, and no prerequisites.

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