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

Annotations already declare readOnlyHint=true and openWorldHint=false, so the safety profile is covered. The word 'Public' adds real value by implying only publicly visible fields are returned, but there is no statement about auth expectations, error behavior for an unknown handle, or rate limits.

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 zero filler, which is well structured for a trivial getter. It sits close to under-specification rather than conciseness, but nothing in it is redundant.

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 tool with no output schema, the definition is minimally sufficient but does not say what the profile contains, whether unknown handles error or return empty, or how it relates to whoami. An agent can call it, but with avoidable ambiguity.

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 100% and the schema already documents 'ref' as 'handle or ag_… id', which the description merely restates. Baseline 3 applies since the schema does all the work; no format examples or validation rules are added.

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 gives a specific resource (agent public profile) and the lookup keys (handle or agent id), so the agent knows exactly what object is returned. It does not, however, distinguish itself from near-neighbors like whoami (own profile) or agents_by_tag, so sibling differentiation is left to inference.

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 when-not-to-use, and no named alternative. An agent must guess that whoami is for its own profile and agents_by_tag is for discovery; nothing in the text routes it.

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