get_gmail_message_content

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

With no annotations provided, the description carries full burden. It discloses the read operation nature ('retrieves') and output format ('message details including subject, sender, and body content'), but doesn't mention authentication requirements, rate limits, error conditions, or whether it returns HTML vs plain text. It adds some behavioral context but leaves gaps for a tool accessing user data.

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 perfectly structured with a clear purpose statement followed by Args and Returns sections. Every sentence earns its place - the first sentence states purpose, the Args section documents parameters, and Returns section describes output. No wasted words or redundancy.

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 3-parameter tool with no annotations and no output schema, the description is moderately complete. It covers purpose, 2/3 parameters, and return format, but leaves the 'service' parameter unexplained and lacks behavioral details like authentication, error handling, or content limitations. Given the complexity of accessing user email data, more context would be beneficial.

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%, so the description must compensate. It documents 2 of 3 parameters (message_id and user_google_email) with basic semantics, but omits the 'service' parameter entirely. The description adds meaning for documented parameters but fails to address the undocumented third parameter, resulting in incomplete coverage.

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 specific action ('retrieves'), resource ('full content of a specific Gmail message'), and scope ('subject, sender, plain text body'). It distinguishes from siblings like get_gmail_messages_content_batch (batch retrieval) and get_gmail_thread_content (thread-level).

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 implies usage context by specifying 'specific Gmail message' and listing required parameters, but doesn't explicitly state when to use this vs alternatives like get_gmail_messages_content_batch or search_gmail_messages. It provides clear prerequisites (message_id and user_google_email) but lacks explicit exclusions or comparison guidance.

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