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

Adds real behavioral context beyond annotations: the response is 'sealed by default: nobody sees it until the round closes', and it flags the API-key requirement and the need for user confirmation. Annotations already cover mutation/idempotency hints, so this extra disclosure is a genuine value-add; only the update-vs-create overwrite semantics remain unstated.

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: action, seal behavior, then requirements. The most decision-relevant content (what it does) is front-loaded with zero 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?

With no output schema, the description covers action, visibility behavior, auth requirement, and a human-in-the-loop caution, which is largely sufficient for a 4-parameter mutation tool. Minor gaps remain around update-vs-new-response semantics and how terms map to structured payloads.

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 75% and each parameter already carries its own description (amount currency, message content limits, terms example). The description adds no field-level detail, so the baseline 3 for schema-driven parameters is appropriate.

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 ('place or update your response') plus the resource ('open listing') and clarifies the domain with concrete synonyms ('bid on an offer, quote on a request'). This clearly distinguishes it from siblings like withdraw_response or create_listing.

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?

Gives clear context (responding to an open listing) and prerequisites ('Requires API key. Ask the user before responding'), which constrains agent behavior. It does not explicitly name alternative tools such as withdraw_response or get_listing, so it stops short of full when/when-not routing.

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