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

Annotations already declare idempotentHint=true and destructiveHint=false, so safety and repeatability are covered structurally. The description adds only that the location must be 'existing' (a partial-update implication), but says nothing about whether omitted fields in the nested location object are preserved or cleared — a meaningful gap for a mutation.

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?

A single front-loaded sentence with no filler; nothing is wasted, though the extreme brevity means it also carries no additional structure or detail.

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?

An output schema exists and annotations cover the safety profile, so much of the burden is off the description. However, for a mutation on a nested object, the description leaves partial-update semantics (e.g., whether omitting checkin_limit resets it) unexplained, which is relevant to calling it correctly.

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% and every parameter (event_id, location_id, nested location fields) is documented in the schema itself. The description adds no syntax, format, or nesting behavior beyond what the schema already provides, so 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?

Names a specific verb (update) and resource (location) plus a scope qualifier (for the provided event), which distinguishes it from create_locations, delete_location, and read_locations. It does not explicitly name those siblings as alternatives, keeping it just below 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?

"Update an existing location" implies the location must pre-exist, but there is no explicit guidance on when to use this versus create_locations or read_locations, and no stated prerequisites or exclusions.

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