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

No annotations are provided, so the description must disclose behavior. It mentions 'Bid' and 'virtual gift', hinting at a mutating, possibly irreversible action, but says nothing about required api_key authentication, cost/commitment of sparks, rate limits, or what happens if the bid fails or the lot closes.

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?

A single front-loaded sentence with no filler. It is efficient, though its brevity leaves it under-specified for a 5-parameter mutation tool.

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 five parameters (four required), no annotations, no output schema, and 40% schema description coverage, this one-line description is far from complete. An agent lacks auth requirements, return behavior, bid mechanics, and full parameter semantics.

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 40%, so the description must compensate. It loosely maps 'sparks' to amount and 'live lot' to lot, and 'for a match' hints at the 'for' parameter, but ignores 'parked' and 'api_key' entirely and gives no format, units, or validation details beyond the sparse 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?

States a specific verb ('Bid') and resource ('sparks on a live lot'), with the purpose of gifting a match. It distinguishes from siblings like buy_badge or send_message, though domain terms 'sparks' and 'live lot' are not defined and the recipient intent is slightly ambiguous.

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?

Implies usage context—on a live lot, as a virtual gift for a match—but gives no explicit when-to-use guidance, prerequisites, or alternatives. An agent must infer that this is the action for bidding during a live auction, with no exclusions.

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