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

Annotations only indicate readOnlyHint=false and destructiveHint=false, so the description carries most of the burden. It does disclose that the action is performed as an authenticated seller and that listing validity and budget fit are constraints. However, it does not explain side effects such as whether a proposal is created, whether the buyer is notified, or what happens on success or 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?

The description is two short sentences with no filler. The core action is front-loaded, and the key constraint about budget and active listings follows immediately. Every sentence earns its place.

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 relatively simple action, the description covers the primary trigger and constraint, but it omits the role of the 'message' parameter, any expected return value, and how this relates to the similarly named sibling 'offer_for_request'. Without an output schema, the agent has little guidance on what the tool returns or what side effects to expect.

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 only 25%, so the description needs to compensate. It implicitly explains request_id and listing_id as 'open request' and 'active listing', and hints at budget relevance, but it does not explain the 'message' parameter at all and gives no parameter-level detail beyond what the schema types show. This is a meaningful gap for a 4-parameter tool.

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 states a specific verb ('Respond to an open request') and a clear resource relationship: the seller's active listing is used to answer a request. It adds important scope ('open request', 'authenticated seller', 'active listings') that clarifies the intent, though it does not explicitly differentiate itself from the similarly named sibling 'offer_for_request'.

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 gives useful context about when this tool is appropriate: for open requests, using an active listing, and when the listing price fits the request budget. However, it provides no exclusions, no explicit alternative routing, and does not mention when a different tool like 'offer_for_request' or 'submit_bid' should be used instead.

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