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

Annotations already declare that this is a non-read-only, idempotent, non-destructive mutation, and the description reinforces idempotency by explaining that re-acknowledging is a no-op. It also mentions the confirmation gate, but this largely repeats the schema; it does not add further behavioral context such as authorization needs, side effects on notification state, or return behavior.

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 description is two compact sentences with the core purpose front-loaded. Every sentence contributes necessary information about the action, idempotency, and the confirmation requirement.

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 simple two-parameter mutation with rich annotations and a fully described schema, the definition covers the essential action, idempotency, and required confirmation. It could be slightly more complete by indicating where to obtain notificationId or what acknowledgment affects, but no output schema exists and the core call requirements are present.

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 100%, so both notificationId and confirmation are already documented in the input schema. The description reiterates that confirmation must be true but adds no syntax, format, lookup guidance, or example beyond what the schema provides.

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 states a specific verb and resource: marking a notification as acknowledged/read. It is clear enough to distinguish from read-only siblings like list_notifications, though it does not explicitly name sibling alternatives or cross-reference how to obtain a notificationId.

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?

The description gives one important usage prerequisite, requiring confirmation: true to execute. However, it does not explain when to use this versus retrieving notifications first, nor does it state any exclusions or alternatives, so usage is mostly implied by the tool name.

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