book_of_the_day

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

With no annotations provided, the description carries the full burden of behavioral disclosure. It reveals determinism, cost, authentication requirements (WALLET_PRIVATE_KEY, USDC on Base), and the date-seeding logic. It does not describe the return format or error behavior, but for a simple tool with one optional parameter, this coverage is strong.

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 description is two sentences, front-loaded with the primary purpose, followed by cost and prerequisites. Every word earns its place, with no redundancy or filler.

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 tool with one optional parameter, no annotations, and no output schema, the description covers the core behavior, cost, and authentication. It could mention the return format explicitly, but the phrase 'book pick' sufficiently implies the output for a user familiar with the corpus.

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 schema covers 100% of parameters with a description for 'date'. The description adds context by linking the date to UTC day and backfill, but it largely restates what the schema already provides. Baseline 3 is appropriate since the schema carries the semantic weight.

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 clearly states the tool's function: a deterministic daily book pick from the indexed corpus, date-seeded for consistency. It distinguishes itself from siblings by emphasizing deterministic behavior and UTC date seeding, which is unique among the listed search and metadata tools.

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 description explains when to use the tool (to get the daily book pick) and mentions the optional date override for backfilling past days. It does not explicitly name alternatives, but the deterministic daily pick function is distinct enough that clear exclusion criteria are unnecessary.

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