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

Annotations already declare readOnlyHint, idempotentHint and non-destructive, so the safety profile is covered. The description adds genuinely useful behavioral context — that House 1 GB is 'not sold yet', the $50/day cap on discounted ANANSI sales, and the three payment rails. It omits anything about the response shape or pagination, which matters because there is no output schema.

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?

The lead clause front-loads the plan inventory, which is good, but the rest is a dense run-on with stacked parentheticals (discounts nested inside prices inside payment rails) that is hard to parse on one read. Every fact is relevant, but the structure could be far cleaner.

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 describing return content, and it does effectively enumerate the plans and their prices. The main gap is that it never tells the agent what form the response takes, only what data it will contain.

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?

The tool takes zero parameters and the schema is fully described, so there is nothing for the description to disambiguate. Baseline for a parameterless tool.

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 establishes the resource (house plans) and that it presents pricing tiers, making it clear this is a catalogue/informational lookup. It also distinguishes itself from the purchase path by naming buy_house_plan as the way to actually transact. It never states a clean verb like 'lists' or 'returns' up front, so the purpose is strong but not explicit.

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?

Usage is only implied: an agent can infer this is the tool to consult for pricing before calling buy_house_plan. The description names that purchase alternative but gives no explicit when-to-use or when-not framing, and says nothing about how this differs from house_list or list_rooms.

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