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

Annotations already declare readOnlyHint, idempotentHint, and destructiveHint, so the safety profile is covered. The description adds valuable behavioral context beyond annotations: it states the exact scope (including archived/retained deleted-ticket plans) and the consequence when no plan exists ('Absent plans remain unknown'). It also declares the required permission (tickets:read), which is auth-related and not in the annotations. No contradictions.

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 sentences, front-loaded with the core purpose ('Read the explicit dated plan of an owned ticket'), followed by scope and permission details. Every sentence earns its place; no redundancy or fluff. The structure is highly efficient for an agent to parse quickly.

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 getter with one parameter and no output schema, the description covers the essential points: what it reads, what it includes (archived/retained deleted plans), what happens when absent, and the required permission. It does not describe the return format, but given the tool's simplicity and the presence of sibling list_ticket_delivery_plan_history for historical detail, the description is almost complete. Minor gap is lack of return structure clarification, but not critical.

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?

The schema has 0% description coverage for ticket_id, so the description should compensate. However, it does not add any detail about the parameter itself beyond the schema's type and format. The parameter is self-explanatory (ticket_id: UUID), so the omission is not critical, but the description adds zero value here. A baseline of 3 is appropriate given the simplicity of the single parameter.

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 action — 'Read the explicit dated plan of an owned ticket' — and edges out ambiguity by noting it includes archived or retained deleted-ticket plans. This clearly distinguishes it from list_ticket_delivery_plan_history (history view) and save_ticket_delivery_plan (write operation), so an agent can identify the correct tool without opening the schema.

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 implies usage by focusing on reading the current plan, but it does not explicitly state when to use this tool over alternatives like list_ticket_delivery_plan_history or get_delivery_timeline. There is no 'use when' or 'instead of' guidance, leaving the routing decision to inference. The mention of 'owned ticket' and 'explicit dated plan' gives some context, but lacks clear alternatives or exclusions.

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