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

Annotations already declare readOnlyHint=true, destructiveHint=false, and openWorldHint=false, so the safety profile is clear. The description adds the useful scoping detail that only public synthetic Spaces visible to the caller are returned, but says nothing about pagination, authentication requirements, or return format.

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 a single front-loaded sentence with no wasted words. It immediately states the action and scope.

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 list tool, the description covers the core purpose and scope, and annotations handle safety. However, it leaves the sole parameter undocumented and provides no usage context, which is a meaningful gap even at low complexity.

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 parameter, 'token', with 0% schema description coverage, and the description does not mention or explain it at all. The phrase 'visible to the caller' gives slight contextual hint about caller scoping, but does not clarify what the token is for or whether it is required.

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 states a specific verb ('List') and resource ('public synthetic Spaces'), with scope limited to what is visible to the caller. It distinguishes this from mutating siblings like spaces_create_draft, though it does not explicitly name alternatives such as spaces_get.

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 explains what the tool does but not when to use it versus alternatives, nor any exclusions or prerequisites. An agent can infer it is for listing public Spaces, but no explicit usage guidance is provided.

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