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

Annotations already cover readOnly/idempotent/destructive, but the description goes further by disclosing the cryptographic verification (Ed25519 JWS against domain JWKS), the set-semantics of the parameters, the re-pricing behavior when either date changes, and an explicit prohibition on side effects. This is unusually rich behavioral context beyond the structured fields.

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?

Front-loaded with the core action, then sequencing, constraints, and parameter semantics in roughly priority order. Information density is high and most sentences earn their place, though the paragraph runs long for a tool description and could be split for scannability.

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?

For a 5-param, cryptographically-verifying, open-world tool with an output schema already present, the description covers sequencing, prerequisites, side-effect constraints, set-semantics, and rendering caveats. Return values are correctly left to the output schema.

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, but the description adds genuinely new semantics: the parameters must be passed as a set matching the original search, night count (not the dates) drives price and capacity, and language never affects price/availability. It stops short of explaining every parameter's error modes, hence 4 rather than 5.

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 compound verb+resource ('Fetch, verify, and render a live host-domain signed VRP stay offer') and names the exact inputs it operates on. It clearly distinguishes itself from hemmabo_search_properties and verify_vacation_rental_node by positioning itself as the downstream signing step.

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 states when to call it: after hemmabo_search_properties returns a host domain, or after verify_vacation_rental_node confirms one from outside search, and 'always before quoting final price or a booking link'. It also gives a hard exclusion (must not lock a quote, create a booking, collect guest details, or start checkout) and routes booking to the signed direct_booking_url.

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