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

With no annotations, the description carries the behavioral burden. It discloses useful behaviors: what it returns and that task text is discarded. However, it does not state side effects, authorization needs, external call behavior, or rate limits; 'Find' only implies a read-only operation.

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 three short sentences with no filler. It front-loads the core purpose, then lists outputs, then adds a relevant data-handling note. Every sentence earns its place.

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?

The tool has 9 optional parameters, no required parameters, no output schema, and no annotations, but the description does not explain what input to supply, how the parameters relate to finding a Monid gateway, or what 'remote MCP hops' means. An agent would likely be unsure whether to pass url, query, or no arguments at all.

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 baseline is 3. The description adds no parameter-level meaning beyond the schema, and the schema's own descriptions are often discard-oriented, but the tool description is not required to compensate when coverage is already high.

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 specific action ('Find a public pay-per-call tool gateway (Monid)') and lists what it returns: CLI setup, how-it-works, skill file, and remote MCP hops. This goes beyond a tautology and generally distinguishes it from the sibling utility/checker tools, though it does not explicitly contrast with any of them.

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 given for when to use this tool versus alternatives. The siblings include many URL/shape/validation tools, but the description never says when agent-tool-index should be preferred or what scenarios it is not for.

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