get_gmail_message_content

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

No annotations are provided, so the description carries the full burden. It clearly states this is a read operation and describes what is returned, but it does not mention authentication/permission prerequisites, error cases, or potential limitations. This is acceptable for a simple getter but not thorough.

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 compact and well-organized into purpose, args, and returns sections. The only minor redundancy is listing 'Required' for user_google_email, which duplicates the schema's required field.

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 simple two-parameter single-message getter with an output schema, the description covers the action, both parameters, and the return fields. It could be improved by mentioning auth prerequisites and alternative tools, but it is sufficient for an agent to invoke it 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 input schema provides bare string fields with zero descriptions, so the Args section is essential. It explains message_id as the unique Gmail message ID and user_google_email as the user's Google email address, adding meaningful semantics. It could clarify where message_id comes from, but the basics are covered.

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 uses a specific verb ('Retrieves') and names a clear resource: the full content of a specific Gmail message, including subject, sender, recipients, and body. The phrase 'specific message' implicitly distinguishes it from batch and thread siblings, though no alternative is explicitly named.

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?

There is no explicit when-to-use or when-not-to-use guidance and no reference to sibling tools like search_gmail_messages or get_gmail_messages_content_batch. However, the phrase 'specific Gmail message' implies the intended use case, providing some contextual guidance.

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