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

Annotations already declare this is a non-idempotent, non-destructive write in a closed world. The description adds real behavioral value on top by naming the required authorization surface: sell scope, a seller account with a wallet, and an API key. It stops short of describing failure modes such as duplicate-bid rejection.

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?

Three short sentences, front-loaded with the action and then the preconditions. No filler, though the repetition of 'Requires an API key' after listing other auth needs is slightly redundant.

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 no output schema and no annotations covering errors, the description should say what a successful bid yields and what happens on failure (job closed, duplicate bid, insufficient wallet). Prerequisites are covered but the mutation's contract is not.

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 description coverage is 0% and the description explains none of the four required parameters. An agent gets no sense of what pitch should contain, whether price_usd must beat an existing bid, or how delivery_days is interpreted, despite the schema carrying only structural constraints.

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+resource ('Bid on an open job'), which an agent can distinguish from siblings like list_bids and award_bid. It doesn't explicitly name a sibling alternative, but the action is unambiguous.

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 description supplies prerequisites (sell scope, seller account with wallet, API key) rather than when-to-use-vs-alternatives guidance. It never says what to do if the job is already closed, has been awarded, or how this relates to list_open_jobs/get_gig.

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