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

Annotations already declare readOnly, idempotent, non-destructive and closed-world, so safety is covered. The description adds a useful enumeration of the categories and their human meaning, but discloses nothing about authorization requirements, error conditions, or defaults for unset switches.

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?

Front-loaded with the core action, then a compact parenthetical glossary of the category identifiers. The gloss list is long but each entry earns its place by decoding a bare enum-style token the agent would otherwise have to guess at.

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?

For a zero-param read with an output schema and full annotations, this covers the remaining gap: what the returned switches represent and which categories exist. Return structure itself is correctly left to the output schema.

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?

The tool takes zero parameters, so the baseline is 4; there is nothing for the description to disambiguate beyond scope, which the first sentence does state.

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?

Opens with a clear verb+resource ("Read the user's notification switches") and specifies the dimensions read (per-category in-app/push/email/Telegram plus quiet hours). It is clearly distinct from sibling mutations like notifications.update and notifications.set_quiet_hours, though it never names them explicitly.

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?

Usage is implied by the read-only phrasing and by the sibling names (update, reset, set_quiet_hours), but the description never states when to call this versus preferences.read or notifications.update. No exclusions or prerequisites (e.g. scope/permission) are given.

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