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

Annotations already declare the write/destructive/idempotent profile, so the description doesn't need to restate safety. It does add real value by naming the required authorization scope (service_areas:write), but it never says whether this is a partial or full replace, or what happens to fields omitted from the payload.

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 short sentences with zero filler; the operation and its precondition are front-loaded and immediately actionable.

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?

With annotations covering the safety profile and a fully documented schema, the description is adequate but leaves two gaps an agent would want: partial vs. full update semantics and whether the updated entity is returned (no output schema exists to answer 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%, with every one of the 7 parameters documented inline, so the baseline is 3. The description adds nothing beyond the schema's own documentation and does not clarify which fields are updatable or how partial updates behave.

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 (service area) plus the lookup key (by ID), so an agent knows exactly what the call does. It does not differentiate from nearby siblings such as bulk_update or update_site, so it stops short of a 5.

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?

There is no when-to-use guidance, no statement of prerequisites beyond scope, and no routing to alternatives (e.g. bulk_update for multiple areas, get_service_area to read first). Usage must be inferred purely from the verb.

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