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

With no annotations, the description must fully disclose behavior, but it only states the resource. It does not specify whether the operation is read-only, what side effects occur, or how results are formatted. The phrase 'owns or was granted' hints at filtering but not behavior.

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 extremely short (one noun phrase), which is concise but lacks substance. It does not front-load any actionable details and provides no structure or context, making it under-specified rather than efficiently concise.

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 tool with one required parameter and no output schema, the description should explain what the 'owner' refers to, what the returned list contains, and any filtering semantics. It does none of this, so the agent cannot reliably invoke the tool.

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 single parameter 'owner' is undocumented in both schema and description. Schema description coverage is 0%, and the description makes no mention of the parameter, its format, or its meaning, leaving the agent with no clue how to fill it.

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 the resource (memory spaces) and scope (owned or granted), giving a clear subject. However, it lacks an explicit verb like 'list' or 'get,' making it more of a definition than an actionable instruction. It does distinguish from siblings like 'grant_space' by implying a read-only listing.

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?

No guidance is provided on when to use this tool versus alternatives such as 'open_space' or 'grant_space.' The description does not mention any conditions, prerequisites, or exclusions, leaving the agent to infer usage.

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