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

With no annotations, the description carries the full burden. It does disclose meaningful behavioral context — cost (+$0.02) and the payment rail (x402) — plus cross-requester scope, which is genuinely useful. But it omits the return format, result semantics, and any limits, so it only partially covers the load.

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?

It is short and front-loaded, which is good, but the raw '{brief}' template placeholder is an artifact rather than explanatory content, so the brevity comes at the cost of clarity. Sized fine for the sentence count but under-specified.

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 tool with a required nested-object input, no output schema, and no annotations, the description is too thin. It explains neither the structure/content of brief nor what a duplicate search returns, so an agent lacks what it needs to invoke it correctly.

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 0% on a single nested object parameter with eleven sub-fields, and the description only echoes the parameter name as the '{brief}' placeholder. It adds zero meaning about what brief must contain (goal, principal_id, tools, constraints, etc.), failing to compensate for the coverage gap.

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 (search) and resource (semantic duplicates) with a scope qualifier (cross-requester), which is fairly distinguishing. However, it does not explicitly differentiate itself from siblings like check_brief, leaving the boundary somewhat to inference.

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?

There is no when-to-use guidance, no exclusions, and no mention of alternatives such as check_brief. The description gives no signal about what conditions should prompt an agent to choose this over a sibling.

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