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

With no annotations, the description carries the full burden and does substantial work: it discloses that every answer carries provenance (source, review date, stage, agent licence details) and that unresolved items come back as explicit gaps with the question to ask rather than guesses. That is meaningful behavioral context an agent could not get from the empty schema, though it says nothing about result volume, ordering, or freshness limits.

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 most important information — what is listed and which fields it contains — is front-loaded, and the caveat about trial coverage follows. The provenance and gap-handling sentences are slightly repetitive in phrasing but each conveys distinct guarantees, so little is wasted.

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 zero-parameter, no-annotation, no-output-schema tool, the description supplies both the record shape and the reliability contract (sourced, dated, gaps flagged). The remaining omission is that it never mentions the singular get_launch alternative, leaving an agent to infer where to go for detail on one project.

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?

The tool takes zero parameters, so there is nothing for the description to disambiguate; the baseline applies. The enumerated field list instead documents the output shape, which is a reasonable substitute given there is no output schema.

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 ("Lists the new launches this service covers") and enumerates the fields returned, so an agent knows exactly what the tool produces. It does not explicitly name the singular sibling get_launch or contrast scope with it, so differentiation is inferable rather than stated.

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 verb "lists" plus the caveat that it covers only "a selection of launches during the trial," which tells the agent the output is not exhaustive. However, no explicit routing guidance is given, such as using get_launch for a specific project or search_floor_plans for unit-level detail.

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