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

With no annotations, the description carries the burden of disclosing behavior. It does mention it returns connection methods and discards task text, but it omits side effects, failure modes, cost implications, network access, or whether external calls are made. This is insufficient for a tool named 'agent-tool-index'.

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 two sentences and avoids redundant wording. It front-loads the main purpose and then adds a behavioral note. It could be slightly clearer, but it is concise and well-structured.

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 a rich schema, the description does not explain how the parameters map to the advertised task categories (weather, search, scrape, voice) nor what 'connection methods' looks like in the response. With no output schema and nine optional parameters, an agent cannot confidently determine what input to provide for a given intent.

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 coverage is 100% with each parameter having a description, so the baseline is 3. The tool description itself adds no extra parameter-level meaning, but the schema descriptions already convey that values are discarded after shape checks. No contradiction or enhancement provided.

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 states a clear action ('Find a public pay-per-call tool gateway') and a resource type, with examples of target tasks (weather, search, scrape, voice) and what it returns ('connection methods'). However, the phrase 'Task text discarded' introduces ambiguity about how the task is specified, preventing a perfect score.

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 suggests when to use it ('for a task such as weather, search, scrape, or voice') but does not contrast it with sibling tools or explain when NOT to use it. The 'Task text discarded' note implies it is not for processing actual task text, but this is not explicit.

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