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

Annotations already declare readOnlyHint/idempotentHint, so the safety bar is lower, and the description still adds real value: it pins the day boundary to New York time, specifies newest-first ordering, describes the payload fields, and warns of the free-account always-empty case. Missing only notes on volume/pagination, which for a same-day list is minor.

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?

Tight, front-loaded, and every clause carries information — what, ordering, return fields, then the two empty-result conditions. The closing phrase "the live calls come with the books" is slightly jargon-flavored for an outside agent, the only drag on an otherwise efficient statement.

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 does the work of explaining the returned shape (instant + price, newest first) and the null cases, which is what an agent needs to call it correctly. Only the sibling relationship and result-size expectations are left implicit.

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, so the schema-side burden is nil and the baseline is 4. There is nothing further the description could add about inputs.

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 verb and resource ("picks the desk published today") plus ordering ("newest first") and the fields returned (publish instant, publish price). The 'today' scoping implicitly separates it from picks_open/picks_closed/picks_record, but no sibling is named explicitly, so an agent must infer the boundary.

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 conditions are conveyed indirectly through the empty-result rules (nothing published today, or a free account), which tells an agent when calling is pointless. However, there is no explicit 'use this instead of picks_open/picks_closed' routing statement, leaving the sibling choice to inference.

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