ucai_list_tools

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

With no annotations provided, the description carries the full burden of behavioral disclosure. It indicates a read-only listing operation and mentions that it includes pricing, but it does not disclose whether authentication is required, how results are paginated or ordered, or if any rate limits apply. For a simple listing tool, this is minimally acceptable but lacks richness.

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, well-structured sentence that front-loads the main purpose and includes key details (all available, UCAI x402 premium tools, pricing). There is no wasted wording or redundancy.

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 zero-parameter listing tool with no output schema, the description is reasonably complete: it states what is listed and that pricing is included. It does not explain the return format, but the simplicity of the tool makes that less critical. The presence of many sibling list tools could warrant more context, but the specific scope ('UCAI x402 premium tools') helps disambiguate.

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 adds no parameter-specific information because none is needed; the empty input schema covers this completely. The description's mention of 'pricing' is relevant to the tool's purpose but not to parameter semantics.

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 tool's purpose: 'List all available UCAI x402 premium tools and their pricing.' It has a specific verb ('List') and resource ('UCAI x402 premium tools'), and it distinguishes itself from sibling tools like 'server_list_tools' and 'marketplace_discover_tools' by focusing specifically on UCAI x402 premium tools.

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 provides no guidance on when to use this tool versus alternatives. While it clarifies it lists UCAI x402 premium tools, it does not contrast itself with similar listing tools such as 'server_list_tools' or 'marketplace_discover_tools', leaving the agent without clear selection criteria.

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