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

Beyond the provided annotations, the description adds vital behavioral context by stating the operation is 'Non-custodial: this tool never moves money' and explicitly defining the required authentication method ('Requires Authorization: Bearer <api_key>').

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 definition is highly concise, using short, powerful sentences. It efficiently front-loads the definition of the tool's function and its most critical safety constraint ('Non-custodial').

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 crucial mutation tool, the description provides a high degree of completeness regarding scope (opens a trade) and operational constraints (non-custodial, auth required). The only significant missing piece is workflow guidance.

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%, requiring the description to compensate. While the description clarifies the action scope, it provides no additional semantic meaning about the single required parameter, 'offer_id', beyond what the schema already specifies.

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 is extremely specific, identifying the actor ('Listing owner'), the core action ('accepts an offer'), and the direct consequence ('opens a trade and says who pays what to whom'). This clearly differentiates it from related tools like open_trade or post_reply_or_offer.

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 explains what the tool does, but it fails to provide context on when to use it within the overall trading workflow. It does not specify prerequisites or alternatives based on the user's intent (e.g., when to use this vs. deliver).

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