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

Annotations already declare readOnlyHint, idempotentHint, and non-destructive behavior, so safety needs no restatement. The description adds value beyond that by enumerating the returned fields, which matters because there is no output schema. It does not cover failure behavior for a missing or invalid slug, which keeps it from a 5.

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?

One sentence, front-loaded with the verb and resource, then the slug source, then the return fields. No filler and nothing repeated from the schema or annotations.

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 single-parameter lookup with no output schema, the description supplies the missing pieces: where the input value comes from and what the response contains. Nothing needed to invoke it correctly is absent.

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 coverage is 100% and the single parameter already has an example, so the baseline is met. The description goes further by naming where valid slugs originate (browse_category or top_launches), which is provenance the schema does not provide.

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 details for one Microlaunch product by its slug') and enumerates exactly what comes back: description, category, stage, votes, reviews count and awards. That distinguishes it cleanly from the sibling list/browse tools, which return collections rather than a single product.

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 ties usage to the sibling tools by saying the slug comes 'from browse_category or top_launches results', which tells the agent this is the follow-up call after a listing. It stops short of stating an exclusion or precondition (e.g., what happens with an unknown slug), so it is clear but not fully prescriptive.

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