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

Goes well beyond the annotations (readOnly=false, openWorld=true) by disclosing the side effects: the office is emailed and a confirmation goes to the supplied email. It also decodes the three possible outcomes — 'booked', 'requested', 'unavailable' — which is behavioral information the agent needs and no annotation could supply.

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?

Four compact sentences, front-loaded with the action before the preconditions and status semantics. No filler, and the status decode is placed last where it supports the call decision.

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?

There is no output schema, yet the description supplies the return semantics the agent actually needs (three status values) plus the notification side effects and the confirmation prerequisite. For a 9-parameter mutation tool, nothing essential 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%, so the baseline is 3; the description adds only mild extra meaning, clarifying that slot_start must be an exact value from list_walkthrough_slots and reinforcing that email receives the confirmation. Both are close to what the schema already states, so the lift is modest.

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 ('Books a free on-site walkthrough') and immediately scopes the input source ('at a time from list_walkthrough_slots'). This distinguishes it clearly from siblings like list_walkthrough_slots and check_service_area.

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?

Explicitly ties the call to a slot produced by list_walkthrough_slots and instructs the agent to confirm time and details with the user before calling, which is genuine when-to-use guidance. It stops short of naming explicit exclusions or alternatives beyond that dependency, so it is clear context rather than full routing.

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