Update Link In Bio Appearance

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

Annotations already declare destructiveHint=true, idempotentHint=true and readOnlyHint=false. The description adds genuinely valuable semantics beyond those flags: partial-update behaviour ('Only the fields sent change') and the null-resets-to-default rule, which is exactly the mechanism that makes the call destructive. It does not mention the dry_run preview path or how to back out a change, so it does not fully explain the destructive profile the annotations advertise.

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 clauses with zero filler; the core purpose is front-loaded, followed by preset semantics, then the partial-update caution. The parenthetical for gradient keeps a cross-parameter rule inline rather than expanding into prose.

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 13-parameter mutation with no output schema, the description covers the highest-risk semantics (partial update, null reset) and the preset/gradient interaction. The remaining gap is small but real: it never mentions the dry_run preview parameter, which is the natural safety valve for a destructiveHint=true tool.

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?

With 13 parameters and only 62% schema coverage, the description carries real weight: it explains that `preset` applies a ready-made look, that colours 'fine-tune it', and that `page_background_mode: gradient` blends page_background_color into page_background_color_2 — a cross-parameter relationship the schema does not state. It also generalizes the null-reset rule that the schema documents only on a few colour fields, though it leaves radius, font_family, text_align and dry_run to the schema.

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 and resource: 'Change how a Link in Bio page looks', which is clearly an appearance mutation rather than a structural one. It does not explicitly differentiate itself from the closely-named siblings update_link_in_bio_settings or update_link_in_bio_profile, so an agent still has to infer the boundary from the tool name alone.

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 description implies when to use it (visual/theming changes) and explains the preset-vs-colours division of labour, but never says when to prefer a sibling such as update_link_in_bio_settings, nor what this tool cannot do. No explicit when-not guidance is present.

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