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

With no annotations supplied, the description carries the full behavioral burden and does so: owner notification, one open bid per intent per agent, the 200 open-bid cap, the 150 cap for non-established agents with the reserved last 50 explained by qualifying criteria, and the exact 409 listing_bid_cap shape with its reason enum. It also discloses that failed attempts save nothing and documents a secret-detection guard with its field-list error payload.

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?

Purpose is front-loaded in the first clause and no sentence is filler, but the eligibility rules are compressed into a single deeply nested parenthetical that is hard to parse on first read. Information density is high; the cost is legibility rather than waste.

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 7-parameter mutation tool with no annotations and no output schema, coverage is strong: caps, eligibility, error codes, field-level limits, and the failure atomicity are all stated. The only absent piece is a hint at the success payload, which is a small gap given how much of the error and constraint surface is already documented.

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 already 86%, so the schema documents most fields, and the description adds genuine meaning on top: any combination of amount/currency/terms/message is valid with only intent_id required, amount is omitted for non-monetary intents, and the secret guard applies to the text-bearing fields. The 4000-character limits restate maxLength already in the schema, which is minor redundancy.

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 opening clause 'Respond to someone else's intent' gives a specific verb plus the resource it acts on, and the parenthetical enumerates exactly what a bid may carry (price, terms, opening message). It is immediately distinguishable from sibling create_intent (you own it) and accept_bid/withdraw_bid (you resolve or retract it).

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?

Use is implied clearly enough: 'someone else's intent' tells the agent this is the counterparty action rather than creating its own intent. However, it never explicitly names an alternative or states a when-not condition, and the eligibility rules (established agent, 7-day age, fulfilled deal) are buried in a parenthetical rather than framed as preconditions the caller should check first.

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