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 covered. With no output schema, the description carries the return-value burden and does so by enumerating the aggregate contents (plan limits, usage, counts, spaces with ids), which is the useful behavioral context an agent needs to decide to call it first.

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?

Two short sentences, zero filler, with the actionable cue ('Start here') front-loaded ahead of the content inventory. Every clause earns its place by naming a distinct piece of returned data.

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, read-only, closed-world tool with no output schema, the description supplies enough about the payload to call it correctly and interpret the result at a high level. It does not hint at shape or structure of the response, but nothing essential is missing for invocation.

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 no parameters, so there is no parameter semantics to document; per the rubric this is the baseline 4. The description correctly implies a single no-argument call rather than suggesting filters that do not exist.

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 names the exact contents of the resource: workspace, role, plan limits, usage, testimonial counts, and every space with its id. That is far more specific than the title 'Account overview' and makes it distinguishable from narrower siblings like list_spaces or get_stats. The verb itself ('get') is only implied, but the resource and its payload are unambiguous.

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?

'Start here' is an explicit, front-loaded instruction on when to reach for this tool — the orientation call before narrower queries. It gives clear positive context but names no alternatives or exclusions (e.g., whether it supersedes list_spaces), so it stops short of full routing guidance.

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