plu_send_message

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

With no annotations, the description should fully disclose behaviors. It only mentions asking for user confirmation, omitting details like whether the message is sent immediately, if it creates a conversation, or any rate limits. The behavior is minimally transparent.

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 extremely concise with two short sentences, front-loading the core action. However, the structure could be improved by including parameter hints in a list. It is not verbose, but it sacrifices completeness for brevity.

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 the tool has 5 parameters, no output schema, and no annotations, the description is woefully incomplete. It does not explain return values, side effects, or parameter relationships, making it insufficient for an agent to use correctly.

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?

The schema has 5 parameters (toUserId, body, propertyId, chatId, exchangeId) with zero descriptions. The description does not explain any parameter's meaning or format, failing to compensate for the low schema coverage. This leaves the agent without guidance on how to populate the fields.

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 'Send a message' and distinguishes it from sibling tools like delete_message or get_messages. However, it could be more specific about the message type (e.g., chat message). Still, it is effective for a simple tool.

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 includes 'Ask user confirmation,' which provides a usage hint, but it lacks explicit guidance on when to use this tool versus alternatives like create_exchange or add_availability. No context about prerequisites or exclusions.

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