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

Annotations already declare readOnlyHint=true, so the safe-read profile is covered and the description is not obligated to restate it. The description adds useful framing about response granularity (day-by-day) and the underlying API path, but says nothing about pagination, date-range limits, or whether pricing is quoted per night vs total. Adequate, not rich.

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 clauses front-load the payload and the framing question before the API reference. Nothing is redundant, though the endpoint citation is marginally useful at best for an agent that already has the tool binding.

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?

With no output schema, the description carries some burden for return shape and does hint at it ('day-by-day availability and pricing'). Required params are all in the schema. It stops short of describing response structure or error behavior, but for a read-only calendar lookup it is close to sufficient.

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 from/to/property_uid/availability_comments are all documented in the schema itself (including the YYYY-MM-DD pattern). The description adds no parameter-level detail beyond the schema, which is the expected baseline when the schema does the heavy lifting.

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 concrete verb-and-resource pair: day-by-day availability and pricing for one property over a date range. The framing question ('is it free, and at what price?') pins down the exact data returned, and the endpoint reference (GET /api/v3.3/property-calendar/{propertyUid}) confirms scope. An agent can distinguish this from list-style siblings immediately.

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 phrase 'the direct answer to is it free, and at what price?' implies the use case well, but no alternatives are named. Siblings such as hostfully_calculate_quote and hostfully_get_pricing_periods overlap this territory, and the description never says when to prefer one over the other. Usage is inferred rather than stated.

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