fill

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

No annotations provided, and the description does not disclose key behavioral traits such as whether the tool mutates state, requires permissions, or handles errors. It only describes the basic action without context on side effects or additional behavior beyond the input schema.

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 sentence, which is concise but lacks structure. For a tool with 26 parameters, a more structured description (e.g., listing key usage patterns) would improve usability. It is not verbose, but it does not earn its place with additional context.

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?

Despite 100% schema coverage, the description does not explain how the many device selection parameters interact, nor does it clarify the tool's output or behavior in different contexts. The absence of an output schema places additional burden on the description, which it fails to meet.

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 description coverage is 100%, so the description adds little beyond what's already documented. It mentions 'by ref, selector, or point' which duplicates the schema's target oneof. The baseline is 3 because the schema carries the burden.

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 action 'Fill text' and the resource 'semantic UI target', plus the three targeting methods (ref, selector, point). It is specific and distinguishes from siblings like 'type' by emphasizing target-based filling.

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 on when to use 'fill' versus alternatives like 'type'. The description does not mention prerequisites, platform considerations, or scenarios where this tool is inappropriate. Given many sibling tools, explicit usage guidance is missing.

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