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

Annotations already declare readOnlyHint=false, destructiveHint=false, openWorldHint=true and idempotentHint=false, so the agent knows this is a non-idempotent, non-destructive, open-world interaction. The description adds only surface/routing context — it says nothing about what happens when the selector matches nothing, whether the element is scrolled into view or waited for, or what a click returns. Useful but not rich behavioral disclosure.

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?

Two sentences, zero padding, and the positive scoping (desktop grid, by pageId) is front-loaded before the negative routing clause. Every clause earns its place.

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 click tool with full annotation coverage and no output schema, the description supplies the identity and disambiguation an agent needs. It is slightly short of complete because it omits failure behavior (missing selector, non-interactable element) and whether an implicit wait occurs, but nothing required to call it correctly is missing.

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%: pageId is documented as 'Page ID from web_navigate' and selector as 'CSS selector of the element to click'. The description restates both without adding format, syntax, or edge-case guidance, so the baseline 3 applies.

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 (click), the target (element by CSS selector), and the exact surface it acts on (DESKTOP grid browser, addressed by pageId). It also explicitly names the sibling it is not (webpage_click) and why, so an agent can disambiguate without opening a schema.

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?

Gives an explicit when-not (NOT a device — real phone or tablet) and routes to the named alternative webpage_click with its addressing key (udid). This is a complete selection rule, not an implied one.

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