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

With no annotations, the description carries the behavioral disclosure burden. It usefully discloses the account prerequisite and auth flow, and states that data appears across web and app. It does not detail per-action side effects like notification delivery or cancellation effects, but the action names and alert-type enumeration convey most of the behavioral surface.

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?

The description is three sentences with no filler. It front-loads the tool's operations, then adds the critical account requirement and usage timing, and closes with the persistence detail. Every sentence contributes actionable information.

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?

Given the multi-action tool, no annotations, and no output schema, the description covers the essential context: what the tool does, when to use it, the required account flow, and where data lives. It does not describe return values per action, but the 100%-covered schema compensates for action-specific parameters, and an agent can discover outputs from the response.

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 baseline is 3. The description repeats the action names and alert types already present in the schema but adds little parameter-level meaning beyond the schema itself, such as the dependency between action and plan/plan_id/alert_type.

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 starts with a clear, specific statement: it manages the DayPlay user's saved outing plans via save, list, set_alert, and cancel_alert. It also distinguishes itself from the sibling plan_outing by explicitly saying to use it after plan_outing, making the tool's role unambiguous.

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 clear usage context: 'Use this after plan_outing when the user wants to keep or monitor a plan.' This tells the agent when to invoke the tool, though it does not explicitly list when NOT to use it or name alternative tools beyond the implied plan_outing comparison.

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