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

Annotations already declare readOnlyHint=true, idempotentHint=true, destructiveHint=false, and openWorldHint=false, so the safety profile is well covered. The description adds leaderboard ranking semantics and time-scope options, but does not describe return format, pagination, or ranking criteria. With annotations carrying the main behavioral disclosure, a 3 is appropriate.

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 compact and front-loaded, moving directly from the leaderboard definition to scope and category filtering, then to usage guidance. Every sentence contributes to selecting or scoping the tool.

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 simple read-only leaderboard tool with two optional parameters and no output schema, the description covers purpose, scopes, filtering, and usage context sufficiently. It leaves return shape implicit, but the leaderboard framing gives the agent enough to call it correctly.

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 both parameters are already documented in the schema. The description restates the scope options and provides additional category slug examples (ai, marketing, dev-tools, productivity, seo), but these largely extend rather than meaningfully deepen the schema. Baseline 3 is correct when schema coverage is high.

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 gives a specific verb and resource: 'Get the current Microlaunch leaderboard: top-ranked launches.' It also states the time scopes and optional category filter, so an agent can understand the operation without opening the schema. It does not explicitly distinguish this tool from sibling tools such as browse_category, which keeps it from a 5.

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 provides a clear usage context: "Use for 'what's new/trending in indie products' questions." This helps select the tool over unrelated siblings. However, it does not explicitly name alternatives or state when another sibling like browse_category would be preferred.

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