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

Annotations only cover the safety profile (readOnlyHint=false, destructiveHint=false). The description adds meaningful state semantics: only pending bids can be withdrawn, the poster's accept ability is removed, and re-bidding remains possible. It stops short of mentioning permissions/auth or the response, so a 4 rather than 5.

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 tight sentences, front-loaded with the trigger and effect, then the state restriction. Every sentence carries distinct information with no filler.

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 two-param mutation with no output schema, the description covers the key precondition (bid must be pending) that an agent needs to avoid a failed call. It omits any mention of response or self-only ownership semantics, but the essentials are present.

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 100% (bid_id points to place_bid/list_bids, bounty_id is the bounty). The description adds no parameter-level meaning beyond what the schema already documents, so the baseline 3 applies.

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 (withdraw) and resource (your pending bid), plus the effect: the poster can no longer accept it. This clearly distinguishes it from siblings like accept_bid and place_bid.

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?

Explicit when-to-use trigger ('when the user no longer wants a bounty you bid on'), an explicit exclusion (bids already accepted or rejected can't be withdrawn), and a recovery path (you may bid again while the bounty is open). No inference needed.

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