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

With no annotations, the description carries the full burden and does well: it explains the return contents, price lifecycle semantics, provenance fields, and a strict gap-handling policy. It stops short of explicitly confirming read-only behavior, auth requirements, or error cases, but the behavior described is substantial and non-obvious.

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 front-loaded with the core purpose, which is good, but it runs long and repeats concepts: source attribution and gap handling are each introduced and then revisited in later sentences. The content is useful, but some sentences could be tightened without losing meaning.

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?

There is no output schema and no annotations, so the description must explain return semantics, which it does: reviewed facts with source and page, price statements with kind and date, stage, licence details, and unresolved gaps. It is nearly complete for a read tool, with only error or empty-result behavior left implicit.

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?

There is one required parameter and schema description coverage is 100%, with the schema explaining that the slug is 'as returned by list_launches'. The description only echoes 'by slug' and adds no parameter details beyond the schema, so the baseline of 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?

The description opens with a specific verb and resource: 'Returns one launch by slug,' and then details the returned content. This clearly separates detail lookup from list-style tools, but the description itself does not explicitly name or contrast with the sibling list_launches.

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 by the need to provide a slug, and the schema note points to list_launches for slug discovery. However, the description gives no explicit guidance on when to use this tool versus list_launches or any other sibling, and no exclusions are stated.

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