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

Annotations already declare readOnlyHint=true and openWorldHint=true, indicating a safe read operation. The description adds 'currently in the space' but does not disclose additional behavioral traits such as whether the list is ordered, how it handles empty spaces, or if it includes only visible players.

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 is appropriately sized for the tool's simplicity.

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?

Given the lack of parameter documentation and absence of an output schema, the description is minimally adequate for a simple list tool. However, it leaves uncertainty about the 'space' parameter and does not specify if the response includes counts or details.

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 0%, so the description should explain the 'space' parameter meaning. It does not. The parameter name implies a space identifier, but no format, examples, or constraints beyond the schema are provided. This is insufficient for an agent to know what to pass.

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 clearly states the verb (List), the resource (players in a space), and distinguishes it from siblings by specifying 'humans and agents' and 'currently in the space'. This is unique among siblings, many of which are for building or memory.

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 implies the tool is for checking current occupants of a space, but it does not provide explicit guidance on when to use it versus alternatives like 'look_around' or 'inspect_region'. No exclusion criteria or alternative tool mentions are included.

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