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

Annotations already declare readOnlyHint=false and destructiveHint=false, so the agent knows this is a non-destructive write operation. The description adds some nuance with 'mark all readable ones read', but it omits key behavioral details like the required idempotency_key, permission needs, or whether dismiss is reversible.

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 a single efficient sentence that front-loads the actions. It is compact and readable, though it could be slightly more structured by separating action descriptions.

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?

This is a four-parameter mutation tool with no output schema and no schema documentation. The description fails to address parameter specifics, idempotency requirements, or the behavior of mark_all_read with respect to the notifications array. It is too sparse for the tool's complexity.

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%, so the description must compensate, but it does not explain any of the four parameters. It does not clarify that action's enum values map to the described behaviors, what workspace is, what the notifications array contains, or why idempotency_key is required.

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 (mark, dismiss) and resource (notifications), and enumerates the possible actions (read, unread, dismiss, mark_all_read). It is clear what the tool does, though no sibling differentiation is needed because this is the only notification tool.

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 lists the actions but gives no guidance on when to choose each one. There is no mention of prerequisites, when to prefer one action over another, or what happens if the notifications array is omitted for mark_all_read.

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