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

Annotations already declare readOnlyHint=true, so the safety profile is covered. The description adds genuine behavioral context beyond that: it discloses what the snapshot contains and notes that OOO events from Google are counted as busy time by the sync engine, a non-obvious engine behavior an agent should know. It stops short of stating auth/permission requirements or rate limits.

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 sentences, each doing distinct work: purpose plus return fields, sibling routing, and one behavioral caveat. Front-loaded with the core action and free of repetition.

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?

There is no output schema, so the description must describe the return value, and it does list the snapshot fields. Usage and one behavioral caveat are covered. Minor residual gaps only (how to obtain syncId, permission requirements), which are low-risk for a read-only single-parameter 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?

Schema description coverage is 0%, but the single parameter still carries type, UUID format and pattern, so the agent knows the expected input shape. The description only implies the parameter via 'for a sync process' and adds no naming, sourcing, or format guidance beyond that; it does not compensate for the missing description coverage.

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 and resource ('Get a consolidated health snapshot for a sync process') and enumerates the returned content (healthy flag, last run status, 24-hour error rate, active alerts, suggested fixes). It explicitly positions itself against the sibling get_sync, so an agent can distinguish the two without opening either 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?

Contains an explicit routing rule: 'Use this instead of get_sync when you want to quickly answer is this sync working?' Names the alternative and the condition that selects this tool over it.

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