get_login_status

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

Annotations already declare readOnlyHint and openWorldHint, so the safety and external-network profile is covered. The description adds value beyond them by disclosing the tri-state result ambiguity — null means verification was impossible, which is materially different from a definitive false — a failure mode callers must handle specially.

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?

Very short and front-loaded: the action comes first, the important result caveat second. The trailing parenthetical '(login status)' merely restates the tool name and is the one piece of 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 no parameters and an output schema already documenting return fields, little is strictly required. But for a tool inside an authentication flow, the description gives no sense of its place relative to start_qr_login, complete_qr_login, or logout, leaving the agent to guess the sequencing.

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, so the baseline is 4. There is nothing for the description to disambiguate on the input side, and it does not waste words inventing any.

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 verb+resource pairing is present: it says it verifies login state against the platform over the network, and the is_login note confirms it returns a login status. However, it never distinguishes itself from the closely related siblings start_qr_login, complete_qr_login, and logout, so an agent must infer where this check sits in the login flow.

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 when-to-use guidance. It does not say to call this before start_qr_login, after complete_qr_login, or to confirm state after logout — the exact routing decision the sibling set demands. The null caveat is about interpreting a result, not about choosing this tool.

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