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

Annotations already declare destructiveHint=true and idempotentHint=false, so the safety profile is partly covered. However, the description never states the key behavioral fact for this tool: existing notes are overwritten (the schema alone hints at this via 'empty string to clear'), nor does it mention permissions or whether history is retained. 'Set or update' undersells a destructive replace.

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 the action front-loaded and no filler. The second sentence is largely redundant with the first, which keeps it just short of a 5.

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 destructive mutation with no output schema, the description is adequate but thin: it omits that notes replace existing content, and says nothing about prerequisites beyond what the schema states. Annotations cover the safety flag, so the gap is not severe, but the overwrite behavior is the one thing an agent most needs.

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 coverage is 100% and all three parameters carry descriptions, including the useful 'empty string to clear' semantics for notes and the pointer to list_my_estates for estate_id. The description adds nothing beyond the schema, so the 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?

The description names a specific verb pair and resource: 'Set or update the user notes on a task.' That is clear enough to distinguish from status/deadline siblings, but it never explicitly contrasts with edit_task, which an agent might reasonably assume also touches notes. Clear purpose, no sibling differentiation.

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?

'Use this when the user wants to add notes to a task' is a restatement of the purpose rather than guidance — it gives no alternatives, no when-not condition, and no hint about how it relates to edit_task or update_task_status. An agent gets no routing information beyond what the name already implies.

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