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

Annotations already declare this is a non-readonly, non-idempotent, non-destructive, closed-world mutation. The description adds essentially nothing beyond that: it does not say whether sparks are deducted, whether a bid can be outbid or withdrawn, or what happens on failure.

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?

One front-loaded sentence with no filler or redundancy. It is efficient, though its brevity contributes to the gaps elsewhere rather than being a model of complete structure.

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 five-parameter mutation tool with no output schema, the description omits critical behavior: whether sparks are spent, whether the bid is final, and what a successful or failed bid returns. Annotations cover only the safety profile, leaving the agent under-informed for correct invocation.

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 lot, amount, for, parked, and api_key are all documented in the schema, setting the baseline at 3. The description contributes no additional meaning about any parameter, so it neither helps nor hurts beyond that baseline.

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 gives a specific verb (bid), resource (sparks on a live lot), and motivation (virtual gift for a match), which distinguishes it from siblings like buy_badge or like_agent. It is not fully precise because 'live lot', 'match', and 'sparks' are domain jargon the tool itself never grounds.

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 statement of when to use this tool versus alternatives such as buy_badge or like_agent, nor any prerequisite such as needing a live lot id or having sufficient sparks. The agent is left to infer the entire usage context.

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