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

Annotations cover the safety profile (readOnlyHint=false, destructiveHint=false, idempotentHint=false), so the description needn't restate it. Beyond the deprecation marker, 'same behaviour' is too vague to be useful, and nothing is said about the authorization requirement or which challenge is consumed.

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 single sentence is duplicated almost verbatim: 'DEPRECATED: use verify_device_login' followed by 'Deprecated — use verify_device_login (same behaviour).' Half the text is redundant repetition.

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?

An output schema exists and the deprecation is surfaced, which covers the essentials for a deprecated alias. However, the auth parameter and the nature of the registration challenge being verified are left unexplained.

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 coverage is only 50% — the nested 'body.challenge_id' is documented in-schema, but the 'authorization' parameter is undocumented everywhere. The description adds no parameter meaning whatsoever, so it fails to compensate for the gap.

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 never states what the tool actually does; the only functional clue is the vague assertion that it has 'same behaviour' as verify_device_login. It does redirect the agent to the correct sibling, but it restates the name/title rather than defining the operation.

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 explicitly names the replacement tool (verify_device_login), which is the key routing decision for an agent. It stops short of stating outright that this tool should never be called for new work or what happens if it is called.

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