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

Annotations already declare readOnlyHint=false, idempotentHint=true, and destructiveHint=false, so the safety profile is covered. The description adds nothing further: it doesn't say whether status transitions are validated, whether re-setting the same status is a no-op (relevant despite idempotentHint), or what the optional note does when supplied.

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?

A single short sentence, front-loaded with the core purpose, with no wasted wording. It is arguably too terse rather than too long, and the misleading status examples slightly undercut its economy.

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 three-parameter mutation with full schema coverage and informative annotations, the description covers the essentials. The missing pieces — transition rules, permission expectations, and the effect of the optional note — are what keep it from being 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%, so the enum of valid statuses and the assignmentId meaning are already documented, giving a baseline of 3. The description's status examples ('done') actually conflict with the schema's 'completed', adding confusion rather than meaning for parameters.

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?

'Updates the status of a task' states a specific verb and resource, clearly differentiating it from sibling status updaters like updateProjectStatus and updateQuoteStatus by resource type. However, the examples given ('e.g. done or cancelled') do not match the schema's enumerated values (scheduled, in_progress, completed, cancelled), and the tool name uses 'Task' while the required parameter is 'assignmentId', leaving a small ambiguity about the target resource.

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 no guidance on when to use this tool versus alternatives such as updateAssignment or createTask, nor any prerequisites (e.g. whether the caller must be the assignee or a manager). Usage is only implied by the verb 'Updates'.

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