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

With no annotations provided, the description carries the full burden. It discloses the behavioral effect of setting visibility to public or private, and the ownership requirement, adding meaningful context beyond the tool name and schema. It could still mention potential side effects or error behavior, but for a simple setter this is adequate.

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 concise sentence that front-loads the action and includes the essential details (public/private semantics and owner restriction) without wasted words.

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 two-parameter tool with no output schema and no annotations, the description covers the action, the meaning of the visibility values, and the authorization constraint. It is complete enough for an agent to select and invoke the tool correctly, though it could explicitly associate 'slug' with the space.

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 0%, so the description must compensate. It explains the possible values for visibility ('public' and 'private') and their meanings, but it does not explicitly clarify that 'slug' is the space identifier or provide details about the slug format. This is a partial compensation for the lack of schema descriptions.

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 uses a specific verb ('set') with a clear resource ('space visibility') and explains the two states ('public' with anonymous read access, 'private' for members only), distinguishing it from sibling tools like brainkb_create_space and brainkb_read_space.

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?

It clearly indicates the intended use (setting visibility) and adds an explicit usage constraint with 'Owner only', which informs the agent when this tool is appropriate. However, it does not explicitly compare against alternatives or state when not to use it, so it is slightly below a perfect score.

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