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

Annotations already declare readOnlyHint=true, idempotentHint=true, and destructiveHint=false, signaling a safe read operation. The description adds the requirement of the Scale plan or higher, which is valuable behavioral context beyond annotations. No contradictions with annotations.

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, succinct sentence that front-loads the core action ('Lists every theme in the workspace') and adds the critical requirement ('Requires the Scale plan or higher') immediately. No 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?

Given the tool's simplicity (zero parameters, no nested objects, read-only annotations), the description is largely complete. However, it doesn't clarify whether the result is paginated or what fields each theme includes, but the output schema likely covers that. Overall, it's adequate.

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?

There are zero parameters, so the description has no need to explain parameters. The schema is empty, so the description's contribution is minimal; however, since there are no params, the description fully covers what's needed. Baseline for 0 params is 4.

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 'lists every theme in the workspace,' with a specific verb and resource, and the scope is clear. It distinguishes from sibling 'get_theme' which retrieves a single theme, though it doesn't explicitly name that sibling.

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 doesn't explicitly state when to use this tool versus alternatives like 'get_theme.' However, the contrast is implied: 'list' for all themes, 'get' for a single one. Sibling names provide context, but no explicit when-not guidance is given.

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