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

Annotations already declare readOnlyHint=true and openWorldHint=true, so the safety profile is covered. The description adds the lookahead window constraint (default 7, max 14), which is useful, but says nothing about result ordering, timezone, grouping by day, or whether unavailable days are omitted — meaningful gaps for an availability 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?

Two tight sentences with the core capability front-loaded and the chaining hint second — no filler. Minor deduction for the ambiguous 'start value' phrasing, which could confuse an agent scanning for an input parameter.

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 simple two-parameter read tool, and the description covers the lookahead scope and the downstream chaining, which is enough to call it. With no output schema, however, the return shape (e.g. what a 'start' value looks like, how days are grouped) is left entirely implicit.

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 0%, so the description must carry the load. It does well on 'days' — supplying the default of 7 (which the schema does not encode via a default keyword) and restating the 14 cap — but business_id is left entirely undefined, and the phrase 'Pass a start value' risks being misread as a parameter name when no 'start' parameter exists 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 plus resource ('Open appointment times for a business') and scopes it to a time window with default and maximum. It is clearly distinct from the booking and business-lookup siblings, though it never explicitly names an alternative the way a 5 would.

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 sentence 'Pass a start value to book_with_deposit' establishes the workflow context — this is the availability step that feeds booking — which is real when-to-use guidance. It lacks any explicit when-not-to-use condition or direct naming of get_business/search_businesses as alternatives, so it stops short of a 5.

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