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

No annotations are provided, so the description carries full behavioral burden. It indicates these are analysis findings 'available for purchase', implying a commercial transaction, but does not disclose whether calling the tool triggers a purchase, requires payment, returns only metadata, or has any side effects. For a tool involving commerce, this is a significant transparency gap.

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, concise sentence with no fluff. It front-loads the primary verb and resource, and includes the key commercial aspect ('available for purchase'). It earns its place, though it could be slightly more structured by breaking out the purchase condition.

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 this is a marketplace tool with commercial implications, the description should clarify whether browsing is free, what happens when purchasing, and what the output looks like (especially with no output schema). The absence of any guidance on the purchase flow or result format leaves an agent uncertain about side effects and follow-up actions.

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 100%, so both 'limit' and 'category' are already documented with their types and constraints. The description adds no meaning beyond what the schema provides; it doesn't clarify valid category values or how category interacts with the results. Baseline 3 is appropriate since the schema does the heavy lifting.

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 uses a clear verb ('Browse') and resource ('marketplace insights'), and mentions they are for purchase. It distinguishes the tool as a marketplace listing/browsing operation, but doesn't explicitly contrast with siblings like search_products or soul_bounties, so it's clear but not fully differentiated.

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 phrase 'Browse marketplace insights' implies a read-only listing use case, and the category filter parameter suggests browsing by category. However, there is no explicit guidance on when to use this vs. a search tool like search_products, nor any mention of purchase flow prerequisites or auth requirements.

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