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

Annotations already declare destructiveHint=true, idempotentHint=true, and readOnlyHint=false, so the safety profile is covered. The description adds genuinely new context not present in structured fields: the required purchase_orders:write scope. It omits any statement about cascade behavior (e.g. what happens to related purchase order lines or links), which keeps it from a 5.

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 filler, leading with the action and target before the permission requirement. Every clause carries information the agent needs.

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 single-parameter delete with no output schema and annotations covering the safety profile, the description supplies purpose, target, and auth scope — enough to invoke it correctly. The only meaningful gap is the lack of any note on side effects to dependent records.

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 the single 'id' parameter is documented as a UUID-formatted 'Purchase order ID'. The description's 'by ID' phrasing adds nothing beyond that, 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 states a specific verb ('Delete') and resource ('purchase order') and how it is targeted ('by ID'), which cleanly separates it from the create_/update_/get_/list_ purchase-order siblings. It stops short of explicitly naming any alternative tool or scoping the operation further.

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 says nothing about when to use this tool versus alternatives or prerequisites. There is no mention of when deletion should be preferred, what state the purchase order must be in, or what to use instead if the goal is to cancel or archive one.

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