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

Annotations already declare readOnly, idempotent, non-destructive, so safety is covered. The description adds genuine context beyond that: the built-in defaults per notification type, that per-workspace changes are reported on top of those defaults, the tellPerson fallback behavior, and that workspace rows are marked isDefault. It doesn't mention authorization requirements, but for a read-only settings fetch that's a minor gap.

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?

The core purpose is front-loaded in the first clause and every following element describes returned content or scope. It is dense with parenthetical lists, which makes it slightly hard to scan, but no sentence is filler.

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 an output schema present, the description needn't detail return values, yet it sketches the response shape usefully. For a fully-read-only two-param tool with complete schema coverage, the remaining undisclosed items (auth scope, paging) are largely irrelevant.

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%, so the baseline is 3. The description earns an extra point by clarifying that workspaceId augments rather than replaces the response ('With workspaceId, also each type's delivery') and by naming the isDefault marker, which the schema does not convey.

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?

The description opens with a specific verb and resource ('Read who hears about what by email') and then enumerates exactly which settings surfaces are returned. It distinguishes the two scopes (agent vs. person) clearly. It stops short of contrasting itself with the write-side sibling notification_settings_set, so a reader must infer read-vs-write from the name alone.

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?

It states the default scope ('for: me, the default') and the conditional behavior of workspaceId, which implies when to pass it. However, there is no explicit when-to-use guidance against siblings (e.g., 'use notification_settings_set to change these') 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.