twilio_get_message

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

With no annotations, the description carries the full burden for behavioral transparency. It only states 'get' without revealing any behavioral traits such as authentication requirements (though account_sid and auth_token appear in schema), rate limits, or error cases. This is insufficient for a tool with no annotations.

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, clear sentence with no fluff. However, it could be slightly expanded to include brief param context without losing conciseness.

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?

The description does not mention the output structure, error handling, or any prerequisites beyond the required params. Since there is no output schema, the agent lacks understanding of what the tool returns, making it incomplete for a read operation.

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 description adds minimal value beyond schema field names, only clarifying that message_sid is the identifier. It does not explain account_sid or auth_token, which are critical for authentication. With schema description coverage at 0%, the description fails to compensate.

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 verb 'Get', the resource 'a single Twilio message', and the method 'by SID'. This effectively distinguishes it from sibling tools like twilio_list_messages which list multiple messages.

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 explicit when-to-use or when-not-to-use guidance is provided. The agent can infer that this tool is for retrieving a specific message by SID, but no alternatives or exclusions are mentioned, leaving the decision implicit.

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