create_marketplace_order_message

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

With no annotations, the description must carry the full burden of behavioral disclosure. It only states the action ('Adds') without revealing permissions, reversibility, side effects (e.g., appending to log), or error conditions (e.g., invalid order_id). This is insufficient for a mutation tool.

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 a single sentence, concise and front-loaded. No unnecessary words. However, it is overly terse and could include more detail without losing conciseness, so a 4 is appropriate.

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?

Given three parameters, no output schema, and no annotations, the description is too sparse. It does not cover return values, required fields beyond order_id, or the interaction between message and status. It is barely adequate for a simple tool.

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%, and the description adds no meaning beyond the input schema. It fails to explain the role of each parameter (e.g., what message text is expected, how status affects the log) or the required order_id. The schema's enum for status is present but not contextualized.

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 clearly states the action ('Adds') and the resource ('a new message to the order's message log'), which distinguishes it from siblings like get_marketplace_order_messages (reading) and edit_marketplace_order (editing order details). However, it does not mention the optional status parameter, slightly reducing clarity.

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?

No guidance on when to use this tool versus alternatives (e.g., get_marketplace_order_messages for reading, edit_marketplace_order for other modifications). The description does not specify prerequisites or context, leaving the agent to infer usage.

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