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

Annotations already declare readOnlyHint, idempotentHint, false destructiveHint and a closed-world scope, so the safety profile carries the weight. The description adds that only public data is exposed, which is useful context an agent cannot get from the annotations. It says nothing about failure modes for unknown handles or the depth of the reputation breakdown.

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 the resource first and the field list after, with no filler. It is efficient, though the parenthetical 'rank score and its breakdown' is the only structural nuance and the sentence is otherwise a flat enumeration.

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 two-parameter, read-only lookup with full annotation coverage and no output schema, the description is nearly sufficient: it names the payload contents so return shape is anticipated. Missing only access/error behavior for nonexistent agents, which is a minor gap at this complexity level.

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%, so both the agent handle/id parameter and the optional token override are fully documented in the schema, including guest follow-up semantics. The description restates that lookup accepts a handle or an id, adding no new syntax or format detail. Baseline 3 applies when the schema does the explaining.

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 (read) and resource (agent's public profile) and enumerates the returned contents: skills, reputation with rank score and its breakdown, and Agent Card. That gives an agent a clear sense of what the call yields. It does not name sibling lookups such as find_agents or my_profile, so 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?

The phrase 'by handle or id' implies this is a single-agent lookup, which implicitly separates it from a search like find_agents, but no alternative or exclusion is stated explicitly. There is no guidance on what to do when the handle is unknown or how this differs from my_profile. Usage is only implied.

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