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

readOnlyHint=true already tells the agent this is a safe read, so the description needn't restate safety. It adds one useful piece of context — that availability data comes back — but says nothing about error behavior for unknown ids or what the user object contains.

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?

A single front-loaded sentence with no filler. It is arguably over-compressed for a tool whose return shape is undocumented, but nothing is wasted.

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 read with no output schema, the description covers the essential lookup and hints at the payload. It stops short of describing the returned user fields or failure modes, leaving modest gaps an agent would have to discover by calling.

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 0%: the lone 'id' parameter has no description in the schema. The description partially compensates by identifying it as a user id (not a location or contact id), but gives no format guidance (numeric vs UUID-style).

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?

States a specific verb and resource ('Get one Spoke user') and adds the scope 'one' plus the return payload ('with availability'), which cleanly separates it from spokephone_list_users and spokephone_list_location_users. It doesn't name a sibling explicitly, but the singular/plural distinction is clear.

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?

The phrase 'by user id' implies you must already know the id, which nudges toward list_users for enumeration, but no alternative or precondition is stated outright. Usage is inferable rather than prescribed.

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