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

Annotations already declare readOnly, idempotent, and non-destructive, so safety is covered. The description adds genuinely new behavioral context: a saved enabled preference is not a delivery guarantee while deliveryAvailable is false. That is the kind of semantic nuance annotations cannot express.

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 tight sentences, no filler. The core purpose is front-loaded and the delivery caveat follows. It could be slightly tighter, but nothing is wasted.

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 no output schema, the description partially covers return semantics by naming the preference value and deliveryAvailable. For a single-parameter read tool this is nearly sufficient; only the id's identity/format is left implicit.

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% for the single 'id' parameter, so the schema gives no meaning for it. The description's phrase 'per-document' implies the id is a document identifier, which partially compensates, but it never states the required format or that the id refers to a document explicitly.

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 clear verb+resource: read the saved per-document email alert preference, scoped to the workspace paying account. It implicitly separates itself from update_document_alerts and get_document_reader_settings by naming the exact resource (email alert preference), though it never explicitly contrasts with those siblings.

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?

No when-to-use or when-not-to-use guidance is given, and no alternative is named (update_document_alerts, get_document_reader_settings). The agent must infer from the name that this is a read-before-write check; the description offers no explicit routing.

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