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

readOnlyHint=true already establishes this as a safe read, and the description is consistent with that. It adds the underlying endpoint (GET /api/v3.3/property-calendar/{propertyUid}) but discloses nothing about response shape, pagination, or date-range limits beyond what the annotations and schema carry.

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: the first front-loads the purpose and value proposition, the second supplies the API mapping. Nothing is padded, though the endpoint reference serves the implementer more than the agent.

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 the burden of return-value signaling and does so by declaring day-by-day availability and pricing granularity. That is adequate for a simple read tool, though it omits anything on date-range bounds or result size.

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 already documented in the schema. The description contributes no additional parameter meaning, making the baseline 3 the correct score.

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 names a specific verb and resource — day-by-day availability and pricing for one property over a date range — and frames the intent ('is it free, and at what price?'). It implicitly separates itself from pricing siblings like calculate_quote and get_pricing_periods, though it never names them explicitly.

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 'direct answer to is it free' framing implies when the tool is useful, but there is no explicit when-to-use, when-not-to-use, or named alternative among the many siblings (calculate_quote, get_pricing_periods). 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.