CTM OAuth Login (Device Flow)

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

Only openWorldHint is annotated, which carries little safety information, so the description bears most of the burden and does disclose that tokens are stored and no API key is needed. It still omits token lifetime, refresh behavior, and failure modes, so it's helpful but not complete.

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 tight sentences that front-load the operation and then the two-phase flow. No wasted words, though the parenthetical 'or pass wait_seconds' slightly glosses over the polling semantics already in the schema.

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 one-parameter, zero-required auth tool with no output schema, the description covers the device flow and token storage adequately. It could mention verification_uri expiry or the polling interval, but nothing an agent strictly needs is missing.

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 100% and the single parameter is fully documented in the schema, so the baseline of 3 applies. The prose echoes the wait_seconds polling behavior without adding syntax or edge-case meaning beyond the schema.

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 verb (logs in) and resource (CTM via OAuth2 device flow), and it explains the full flow. It doesn't explicitly differentiate from nearby siblings like auth_exchange or auth_url, so it's clear but not fully distinguished from alternatives in the auth family.

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 implies the two-phase usage (call, then call again or pass wait_seconds), which is genuine guidance, but it never says when to prefer this over auth_url or auth_exchange, nor when not to use it. Usage is implied rather than explicitly scoped.

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