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

Adds substantial context beyond annotations: immediate confirmation, Cal.com emailing both parties, the returned booking id/meeting link/reschedule-cancel links, and a concrete limit of 2 upcoming calls per email. Only minor gaps remain, such as what happens if the slot is taken between availability and booking.

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?

Dense and front-loaded: purpose, mechanics, prerequisite, constraints and return values in five sentences with no filler. Every sentence carries operational 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?

Although there is no output schema, the description enumerates the returned booking id, meeting link and reschedule/cancel links. Combined with the prerequisite, constraints and rate limit, an agent has everything needed to call this correctly.

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?

With 83% schema coverage the baseline is 3, but the description adds real meaning: notes is 'a short, factual summary of what the user wants to discuss (shown to Matt)' and the caller must pass the user's real name, email and time zone. It reinforces the ISO slot-start requirement already in 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?

States a specific verb+resource with scope: 'Book a free 30-minute intro call with Matt Turley (Continuum) directly on his calendar.' It is clearly distinguishable from siblings like get_availability, which it names as the required predecessor.

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 when-to-use and prerequisites: call get_availability first and pass the exact slot start, and only book after the user has asked for the call and agreed to a time. It also names the sibling to consult beforehand.

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