check_in

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

With no annotations provided, the description carries the burden. It discloses the action (check-in), the timer-starting behavior (a mutation), and the role nuance ('if you are admin'), but doesn't describe side effects like whether a check-in takes an attendance action, whether it fails if already checked in, or what the response returns. Some behavioral context but notable gaps.

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 compact sentences, no wasted words. The first sentence states the primary action, the second adds the optional behavior and role note. Efficient and front-loaded.

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?

This is a single-optional-param action tool with no output schema. The description covers the main behavior and admin nuance but doesn't address edge cases like duplicate check-ins, error conditions (e.g., what if ticket_id is invalid), or whether check-in requires existing authentication. Adequate but could add a bit more about behavior/effects.

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%, so the schema already documents ticket_id as 'Ticket to start timing on'. The description adds contextual meaning by explaining that omitting ticket_id enables presence-only check-in (admin). This adds value beyond the schema's literal parameter description, so slightly above baseline but not rich.

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 clearly states the action ('Check in for today') and identifies the resource (a ticket via ticket_id, or presence-only). It distinguishes behavior based on whether a ticket is passed. However, it doesn't directly differentiate from siblings like check_out or stop_timer, though the verb+action is reasonably clear.

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 explicit when-to guidance: 'Check in for today' plus a clear optional behavior with ticket_id, including an admin-specific note ('omit ticket_id for presence-only if you are admin — still recommended to pass a ticket'). It conveys context for when to pass a ticket vs. presence-only, though it doesn't explicitly exclude alternatives.

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