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

Annotations already declare readOnlyHint, idempotentHint, and destructiveHint=false, so safety is covered. The description adds a genuinely useful output quirk not present in any structured field: unlimited plan limits are returned as the literal string "unlimited", which prevents a type-parsing mistake. It stops short of describing other return shapes.

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 sentences, zero waste, with the returned fields front-loaded and the edge-case caveat placed last where it belongs.

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?

With no parameters, no output schema, and annotations carrying the safety profile, the description is nearly sufficient: it names the returned fields and flags the 'unlimited' sentinel value. Only the relationship to get_billing_url remains unaddressed.

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 zero parameters, so the baseline is 4. There is nothing for the description to disambiguate, and it correctly avoids inventing parameter details.

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?

States a specific verb+resource ('Read workspace identity, plan limits, live project count, and the in-app billing URL') and enumerates exactly what comes back, so the agent knows what the tool returns. It does not differentiate from the sibling get_billing_url, which also concerns billing URL retrieval — a missed opportunity given the overlap.

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?

There is no when-to-use guidance and no alternatives named. The overlap with the sibling get_billing_url (the description mentions an 'in-app billing URL') is left unresolved, so the agent must infer which tool to call for billing information.

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