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

With no annotations, the description must carry the full behavioral burden. It mentions selection criteria (observed public metadata, buyer policy) but does not state whether the tool is read-only, what it returns, whether it incurs cost, or what side effects occur.

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 front-loaded sentence with no wasted words. It is concise, though the brevity reflects under-specification rather than efficient completeness.

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?

Given the routing complexity, 0% schema description coverage, no annotations, and no output schema, the description is far too thin. It omits return behavior, selection mechanics, constraints, and parameter meaning that an agent 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% and the description adds no meaning to the three parameters. It never explains mode values (CHEAPEST, BALANCED, PROVEN, STRICT), capability values, or max_price_usdc, leaving the agent to infer entirely from names and enums.

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 verb (Select) and resource (provider), but 'using observed public metadata and buyer policy' is abstract and does not clarify that routing is for a capability request. It also gives no sibling differentiation from market_capabilities.

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 guidance on when to use this tool versus market_capabilities, nor any conditions or prerequisites. The description only says what it does, not when or why to choose it.

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