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

Annotations already declare destructiveHint=true and idempotentHint=true, so the safety profile is covered; the description adds genuine context beyond them by specifying the effect on future runs and noting the call is free of cost. It still does not say whether historical runs, logs, or the schedule definition itself survive, which matters for a destructive operation.

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 deletion sentence is front-loaded and earns its place, but "Free." is a fragment and the trailing security note about header names, prompt text and sheet values describes data this tool does not read or return. That sentence is boilerplate relative to a delete-by-id operation and dilutes focus.

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 one-parameter, no-output-schema tool with rich annotations, the definition covers effect and cost adequately. The one material omission is reversibility and what happens to existing run history, which an agent would want before invoking a destructive call.

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 the single parameter already carries the description "A schedule_id from list_schedules", including UUID format and pattern constraints. The prose adds no additional meaning about the identifier, 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?

States a specific verb and resource ("Delete a schedule") plus the operational consequence ("no further runs start from it"), which separates it from cancel_run/cancel_flow_run and delete_flow without naming them. It stops short of explicitly contrasting with list_schedules or delete_flow, so it is clear but not fully sibling-differentiating.

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 phrase "so no further runs start from it" implies the when-to-use case (permanently stopping future scheduled runs) versus cancelling a single in-flight run, but that inference is left to the agent. There is no explicit when-not-to-use, no mention of alternatives, and no prerequisite such as needing to look up the id via list_schedules in the prose.

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