setup_gmail

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

Annotations already declare a non-read-only, open-world, non-destructive operation, and the description adds real context on top: a visible browser window is launched (interactive, user-facing side effect) and auth state is persisted to disk for later reuse. It stops short of saying whether the call blocks until login completes, what happens on timeout/cancel, or where the state is stored.

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?

Two short sentences, zero filler, with the primary action front-loaded and the persistence/consumer detail following. Every clause earns its place.

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 zero-parameter tool whose annotations already cover the safety profile, the definition supplies the essentials: what is launched, what is persisted, and who consumes it. The remaining gaps (blocking behavior, timeout, auth-state location, return value) are minor but real for an interactive browser flow.

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 tool takes zero parameters and the schema is empty, so there is no parameter semantics for the description to carry. Baseline 4 applies for a no-argument tool; nothing is missing or misdescribed.

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?

Names a specific verb and resource ('Launch a visible browser for Gmail login') plus the side artifact it produces ('saves auth state'), which is enough to distinguish it from every sibling in the list. The downstream consumer, check_status, is named explicitly.

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 makes the usage context clear: this is the interactive login step whose saved state is later reused headlessly by check_status. It does not state exclusions or prerequisites (e.g. that it must run before check_status, or what to do if auth already exists), so it falls short of a full when/when-not statement.

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