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

With readOnlyHint=true and openWorldHint=true, the safety profile is covered by annotations. The description adds behavioral context beyond the annotations: it promises an exhaustive listing ('every tool'), categorizes the catalog by media type, and discloses that prices are included. This is useful but does not go into gotchas like pagination or formatting.

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?

A single, front-loaded sentence that contains only essential information: what is listed, the scope, and what fields are included. No filler or redundant restatement of the tool name.

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?

For a no-parameter listing tool with no output schema, the description fully conveys what the agent should expect: a list of tools with inputs and prices. There are no extra parameters, side effects, or complex return structures to document. The description is complete.

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 tool has zero parameters, so the baseline is 4. The description correctly implies no inputs are needed by saying 'List every...', and the input schema confirms an empty object. Nothing more is needed here.

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 verb ('List'), a clear resource ('every RegiAI tool'), and the exact scope ('image, video, audio') plus the fields returned ('inputs and price'). The title reinforces this. It is instantly distinguishable from the sibling tools, which are individual operations rather than a catalog.

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 use case is implicitly clear: call this tool when you need to discover the available RegiAI tools and their pricing. It does not explicitly name alternatives or state when not to use it, but there is no close sibling that competes with this listing behavior, so the context is sufficient.

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