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

Annotations already declare this is a non-read-only, open-world, non-destructive write. The description adds meaningful context beyond that: it sends a confirmation to the client, it fails when the slot is taken, it confirms each call by default with an option to disable, and it requires a Cotlet API key. These side-effect and failure disclosures are genuinely useful for a mutation tool.

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 purpose is front-loaded, but the description is notably repetitive: it states the booking purpose and the confirmation twice with near-identical wording. Tightening to one pass would make it more efficient without losing 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?

For a mutation tool with no output schema, the description covers the relevant agent-facing concerns: side effects (client confirmation), failure condition, confirmation policy, external-person impact, and auth requirements. It is close to complete, lacking only guidance on sequencing with slot-availability siblings.

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 six parameters are fully documented in the schema, setting the baseline at 3. The description adds only marginal meaning (services booked in order with one employee, starting at the given time) and no format or constraint details beyond the schema.

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 gives a specific verb and resource — booking one or more services for a client with an employee, starting at a given time. It is clear what the tool does, though it never explicitly distinguishes itself from siblings like meevo_reschedule_appointment or meevo_find_open_slots, and it restates the same purpose twice rather than adding differentiation.

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?

It provides operational context (fails if the time is no longer free, confirm each call by default, confirm with the user since it reaches other people) but gives no explicit routing guidance such as when to prefer this over reschedule or to call find_open_slots first. Usage is implied rather than stated against alternatives.

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