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

With no annotations, the description carries the full behavioral burden. It usefully discloses the confirm gate and that no payment is processed, but says nothing about required permissions/ownership, what happens to the price or existing buyers when unlisted, or whether the action is reversible — significant gaps for a marketplace-visibility mutation.

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 with no filler; the action scope is front-loaded and the clarifying negative constraint follows it. Nothing repeats the name or wastes space.

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 5-param, no-annotation, no-output-schema mutation tool, the description is thin: it omits currency semantics, price-isMarketplace interaction, and any preview response expectation beyond the schema's own confirm text. Adequate for calling it, but an agent lacks the context to invoke it confidently in edge cases.

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 only 20% (just confirm is documented), so the description needs to compensate. It adds intent for confirm ("confirm-gated"), price ("set its price"), and isMarketplace ("list or unlist"), but leaves currency unexplained and never says whether price is required when listing versus optional.

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 set (list/unlist, set price) on a specific resource (diet plan template on the Trainzilla marketplace), which cleanly separates it from set_workout_plan_template_marketplace. The closing sentence clarifies a negative scope — no payment processing — so an agent won't confuse this with a billing tool.

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?

"(confirm-gated)" implies the two-step preview/execute flow and the description hints the tool is only for the availability+price aspect, but it never names when to use it versus update_diet_plan_template (which edits content) or list_diet_plan_templates. Usage is inferable rather than stated.

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