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

Annotations already cover the safety profile (readOnlyHint, idempotent, non-destructive, closed-world). Beyond that, the description discloses behavior the annotations cannot: only in-stock items are picked, exactly one pick per slot, each with a short reason and a variant_id, and shoes are included only when a size is supplied. This is useful context, especially since there is no output schema to describe the return payload.

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 tight sentences, front-loaded with what the tool produces and followed by the output contract. Every clause carries information — slots, conditional shoes, one pick per slot, reason, variant_id, next step. No filler or restatement of the title.

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 five optional params and no output schema, the description does the important work: it explains return contents (variant_id + reason per slot) and the in-stock constraint. Remaining gaps are minor but real — it does not say how budget_usd constrains picks or whether the racket itself is excluded from the response (only the schema notes the budget excludes the racket).

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 60%, so level, gender, and budget_usd are already documented; the description only reinforces the shoe_size gating condition ('shoes when a US shoe size is given'), which the schema itself states. It adds nothing about how level/gender influence picks or how budget_usd is applied, and racket_brand's matching role is left entirely to the schema description. Baseline 3 for a partially-covered schema.

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 names a specific verb+resource ('Completes a racket') and enumerates exactly what gets filled in: balls, overgrip, bag, and conditionally shoes. It also states the output shape (one in-stock pick per slot, short reason, variant_id). It stops short of naming the sibling it pairs with (find_racket) or contrasting with search_products, so sibling differentiation is implied rather than explicit.

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?

'ready for add_to_cart' and 'Completes a racket' imply the workflow position — call this after a racket is chosen, then hand variant_ids to add_to_cart. However there is no explicit when-to-use statement, no when-not to use it, and no named alternative (e.g. use search_products for single-item browsing). Usage is inferable but not spelled out.

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