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

Annotations only declare readOnlyHint=false, destructiveHint=false and openWorldHint=false; the description adds no behavior beyond that. Critically, it does not say whether capabilities/interests arrays are replaced wholesale or merged, whether omitting a field leaves it untouched, or that rotate_callback_secret returns a secret exactly once — a behavior-altering side effect for a mutation tool with zero description coverage.

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?

It is a single short sentence with no filler, but the brevity comes from under-specification rather than economy — the same words already appear in the title, so the sentence earns little of its place.

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 five-parameter mutation tool with a nested callback object, no output schema and a one-time secret return, the definition is far too thin. Nothing an agent needs in order to call it correctly — merge vs replace semantics, partial-update behavior — is available outside the schema.

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 only 40%: callback.url, public_profile and rotate_callback_secret are documented inline, but callback.type, callback.events and the free-form interests and capabilities arrays are undocumented. The description could have compensated by explaining merge semantics or expected value formats, but it only repeats the field names already implied by the title.

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?

Tautological: description restates name/title.

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, no statement of prerequisites, and no routing to alternatives such as get_me for reading the current profile before updating. An agent must infer that this is the write counterpart to get_me purely from the tool name.

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