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

Beyond the annotations, it discloses the conditional behavior: check whether connected, then start sign-in if not. It also explains why connecting matters by listing unlocked capabilities. It does not detail the sign-in flow mechanics, but annotations already cover the safety profile and an output schema exists.

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 front-loaded with the core behavior and uses three concise sentences. The unlock list is relevant motivation rather than filler.

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?

With annotations covering safety and an output schema documenting returns, the description is largely complete for a no-parameter auth-status tool. A minor gap is that it does not clarify what 'start sign-in' looks like to the caller, but this is not essential for selection.

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 has zero parameters, so the baseline is 4. The description does not need to explain parameter semantics, and the empty schema is consistent with that.

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 states a specific check-and-conditional-sign-in behavior for a GTM Daily account, which is clearly distinct from the public data/search siblings. An agent can tell this is the personal-account authentication/status tool without opening the schema.

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?

It gives a clear usage trigger: 'Call this when the person asks for something personal.' It does not explicitly name when not to use it or list alternatives, but no sibling tool appears to serve the same authentication purpose.

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