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

Annotations already declare destructiveHint=true and idempotentHint=true, but the description adds genuinely new behavioral context: existing scheduled Pins are neither unscheduled nor deleted, only future placement stops. It also discloses cost ('Free') and an irreversibility-avoidance protocol (confirm before calling, state which day/time is removed).

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?

Purpose is front-loaded in the first clause, followed by the consequential behavior. It is on the long side and the account-selection guidance reads as a general policy appended to this tool, costing some tightness, but no sentence is padding.

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 two-parameter delete with an output schema and rich annotations, the description covers trigger, side-effect boundaries, alternative tool, confirmation protocol, and account disambiguation. Nothing needed to call it correctly is missing.

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 both parameters are described there, so the schema does the heavy lifting. The description only adds the provenance hint that timeslotId comes from list_timeslots; accountId usage is addressed but only as a selection policy, not as parameter semantics. Baseline 3 is appropriate.

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: 'removes a single smart schedule timeslot by timeslotId'. It also names the source of the ID (list_timeslots) and implicitly contrasts with update_timeslot and rebuild_schedule, so the agent can distinguish it from siblings without opening a 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?

Explicit trigger ('when the user wants to stop posting at one recurring time'), an explicit alternative with the condition that selects it ('deleting the specific slots they dislike is safer than rebuild_schedule'), a confirmation requirement, and a disambiguation rule for multiple accounts. That is unusually complete routing guidance.

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