Login to Cloud Provider

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

Discloses key behavioral traits beyond annotations: it is a browser-based device-code login, returns quickly with a URL and one-time code, does NOT wait for completion, runs in the background, and interrupts the user. This aligns with openWorldHint=true and readOnlyHint=false, adding crucial context about the asynchronous, user-interrupting nature.

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 thorough and well-structured, with the core purpose first and detailed usage instructions following. It is somewhat lengthy, but every sentence contributes essential context (async behavior, user interaction, retry logic) that an agent needs; no 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?

For a tool with no output schema and no params, the description fully explains the return behavior (URL and code), the required user action, the background execution, and the correct sequence with sibling tools. Nothing critical is missing for correct invocation and handling.

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?

With 0 parameters, the schema is fully self-describing (coverage 100%), so the description need not elaborate on params. It does not add parameter-specific details, but the baseline of 4 applies because no params exist; no additional compensation is needed.

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 tool's purpose: 'Start authenticating this machine with the remote device cloud provider.' It identifies the specific verb (authenticating) and resource (cloud provider), and explicitly names the sibling tools that depend on it (mobile_list_remote_devices, mobile_allocate_remote_device), distinguishing it from them.

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?

Provides explicit guidance: when to use (as a prerequisite for the two remote-device tools, if they fail with auth errors), when not to use (never speculatively, only after explicit user request), and names alternatives (the dependent tools). It also instructs on the retry flow after login completion.

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