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

Annotations already declare destructiveHint=true, idempotentHint=false and readOnlyHint=false, so the safety profile is covered; the description adds value by naming the required `notifications:write` permission scope and confirming the bulk, per-workspace, per-user blast radius. It does not say whether the change is reversible or how to undo it, which would matter for a bulk mutation.

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 short sentences with zero waste; the action and scope are front-loaded and the permission requirement is a compact trailing clause.

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-parameter, no-output-schema bulk mutation, the description covers scope, subject and required permission. Only the absence of any statement about reversibility or the result of the operation keeps it short of fully complete.

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% and both `account` and `workspace` are thoroughly documented in the schema, so the description need not repeat them. It adds the concept of an 'active workspace' default, but no syntax or format guidance beyond the schema. Baseline 3 applies.

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 specific verb and resource with explicit scope: 'Mark every unread notification in the active workspace as read for the current user.' The words 'every' and 'unread' implicitly differentiate it from the singular pm_mark_notification_read, but that sibling is never named, so an agent must infer the distinction.

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 scoping language ('unread', 'active workspace', 'current user'), and the API-key scope line hints at a prerequisite. There is no explicit when-to-use versus pm_mark_notification_read, nor any warning about when not to run a bulk update.

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