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

Annotations already declare destructiveHint=true, openWorldHint=true, idempotentHint=false and readOnlyHint=false, so the safety profile is covered externally. The description adds genuinely useful merge behavior ('Fields left out stay as they are') and a return statement, but it never explains what makes the operation destructive or what is at risk when hiding parts of a public profile.

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?

Three short sentences with zero waste: capability first, partial-update semantics second, return value last. Nothing is repeated from the schema or annotations.

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 mutation with nested open-ended settings, the description covers the core semantics and the return value. It leaves the important gaps: which setting keys exist, and why the tool is flagged destructive despite merge semantics.

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%, so the schema already documents both parameters, and the description only mirrors them at a high level ('rename your handle', 'show and hide parts'). The merge sentence is a real addition beyond the schema, but the nested settings map accepts arbitrary keys (additionalProperties: true) that neither the schema nor the description names.

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 states a specific verb and resource: rename the handle and toggle visibility of parts of the public profile. It reads clearly as the write counterpart to get_profile_settings, though it never names that sibling or get_public_profile to draw the boundary 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?

Use is implied by the mutation framing, and 'Fields left out stay as they are' usefully signals partial-update semantics. But there is no explicit when-to-use guidance, no pointer to get_profile_settings for reading current values, and no prerequisites such as authentication.

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