gemini_compare_urls_tool

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

With no annotations, the description carries the full burden of disclosing behavior. It does not mention whether the tool performs network requests, has side effects, requires specific permissions, or what it returns. The user is left completely in the dark about the tool's runtime 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 concise, which is efficient, but over-trimming reduces usefulness. It lacks essential details that could be conveyed without bloat, such as a brief explanation of the comparison types. It is a single sentence, but not well-structured for informative purposes.

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?

While an output schema is present (as indicated by context), the description does not explain the return format, error conditions, or any side effects. There is no mention of required context, limitations, or how the 'model' and 'aspect' parameters affect the comparison. The tool feels incomplete for practical use.

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 schema provides descriptions for all parameters (url1, url2, model, aspect), achieving 100% coverage. The descriptions are concise but adequate for basic understanding. However, the description does not add any extra context beyond the schema, so it slightly misses full value.

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 'Compare two URLs.' is extremely vague. It does not specify what kind of comparison is performed (content, structure, performance, etc.) or what the output will be. It is distinguishable from sibling tools only by the verb 'Compare', but lacks enough detail to clearly convey the tool's purpose.

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 like 'analyze_url' or 'extract_from_url'. There is no mention of scenarios, prerequisites, or context in which comparison is appropriate.

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