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

Annotations already declare idempotentHint=true, destructiveHint=false, and openWorldHint=true, so the safety profile is covered. The description adds the provenance/ownership constraint on `name`, which is helpful, but says nothing about how `fields` replacement behaves or what happens to unlisted fields.

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 waste, with the core action front-loaded and the identifier constraint immediately after. 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?

A mutation tool with full schema coverage and annotations carrying the safety profile needs little more; the description covers the key identifier caveat. It stops short of explaining replacement semantics or the return value, but no output schema exists to cover that.

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 the baseline is 3, but the description adds genuine meaning for `name` by tying it to the list tool and to this location's ownership. The replace-vs-merge semantics of `fields` remain documented only in 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 (update) and resource (action link on a Google Business Profile location), which cleanly distinguishes it from the create/delete/list siblings by name. It does not explicitly call out those alternatives, but the operation is unambiguous.

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?

Provides one real precondition: `name` must be the full resource path obtained from google_business_place_action_links_list and must belong to this location. That is useful routing context, but there is no guidance on when to update vs. create/delete, nor on prerequisites like required scopes.

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