KAI Router

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

With no annotations, the description carries the full burden. It usefully discloses that results are ranked and include price, recent demand and a callable URL, and that the search itself is free (no payment/auth implied). It omits pagination, ranking methodology, rate limits, and what happens on zero matches.

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?

Two compact sentences, front-loaded with the verb and resource, followed by return contents and cost. No filler, no 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?

With no output schema and no annotations, the description compensates by naming the returned fields (price, demand, URL) and the cost profile, which is what an agent needs to decide to call it. Minor gaps remain around pagination/limit behavior and empty-result handling for a 3-parameter search tool.

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 67%, with query and max_price_usdc documented in the schema while limit is not. The description adds only that the query is 'for a task', which roughly aligns with the schema example but does not explain the limit parameter or clarify the price ceiling 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?

States a specific verb (Find) and resource (pay-per-call tools), and qualifies the domain precisely with protocol and settlement details (x402, USDC on Base). An agent immediately knows this is a discovery/search tool for paid endpoints, not a tool that calls 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?

'for a task' frames the input context, and 'Free' tells the agent that searching costs nothing, which is useful before committing to paid calls. However, there is no explicit when-to-use statement, no mention of what to do with the results, and no exclusions or alternatives described.

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