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

Annotations already declare readOnlyHint=true, destructiveHint=false and openWorldHint=false, so the safety profile is covered. The description adds genuine extra context beyond that: 'as others see it' discloses that the returned view is audience-filtered, which matters for interpreting the response. It stops short of describing auth requirements beyond what the api_key schema already says.

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?

One sentence, front-loaded, zero filler. The audience-visibility qualifier is the highest-value piece of information and it lands immediately.

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?

A simple, zero-required-parameter read tool with no output schema and full annotation coverage, so the burden is light. The definition is nearly complete for calling it correctly; a one-clause pointer to get_profile or update_my_profile would close the remaining routing gap.

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?

There is a single parameter (api_key) with 100% schema description coverage, including its optional-header fallback. The description adds nothing about parameters, but with full schema coverage the baseline of 3 is appropriate.

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 the resource (your own profile) and adds a scope qualifier, 'as others see it,' which tells the agent the response is the publicly visible representation rather than a private/raw record. It implicitly separates itself from the sibling get_profile (someone else's profile), though it never names that sibling explicitly.

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?

Usage is implied rather than stated: fetch your own profile. There is no explicit when-to-use guidance, no exclusion rules, and no pointer to the obvious alternatives get_profile (other users) or update_my_profile (mutating it), even though those siblings are present.

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