schedule_email

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

With no annotations, the description must carry behavioral disclosure. It does disclose the default smart scheduling behavior and the optimal time window (Tue-Thu, 9-11am). However, it does not mention whether delivery is guaranteed, cancellation options, or any side effects beyond scheduling.

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 concise sentences. The first states the core purpose, and the second adds a key behavioral detail. Every word earns its place, with no redundancy or filler.

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?

The tool has a simple parameter set and no output schema, so completeness is adequate. However, given the presence of a similar sibling (schedule_followup), the description lacks differentiation. It also omits any mention of return values or confirmation behavior, which are relevant for scheduling tools.

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 baseline is 3. The description adds context about smart_schedule's default behavior, which aligns with the schema. It does not add additional meaning for send_at or email_id beyond what the schema already provides.

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 tool's function: 'Schedule an email for delivery.' This is a specific verb+resource pairing. It distinguishes from generate_email (creation) and check_tracking (monitoring), though it does not explicitly differentiate from the sibling schedule_followup.

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?

No guidance is provided on when to use this tool versus alternatives like generate_email or schedule_followup. The schema implies it operates on an existing email_id, but the description does not mention this prerequisite or any exclusions.

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