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

Annotations already declare readOnlyHint=true, destructiveHint=false and openWorldHint=false, so safety is covered. The description usefully adds a hard coverage boundary ('Last 90 trading days') and clarifies that it mirrors the closelook.net/days/<date>/ page, but says nothing about response shape or pagination behavior.

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?

A single front-loaded sentence whose clauses each carry information: the source, the date/latest behavior, the enumerated payload, and the coverage limit. Slightly dense with the URL reference and em-dash appositive, but nothing is wasted.

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 returns and does so by naming the three content types and their links. The remaining gap is the response envelope (single object vs. list when 'days' is supplied), which is not stated.

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% and both parameters are already documented in the schema (date format and 'omit for the latest', plus the 1–14 day range). The description reinforces the date-omission behavior and the 90-day window but adds no syntax or default detail beyond the schema.

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 resource (the trading-day hub) and enumerates exactly what it returns — Morning 10, Midday 10, and Daily Pulse editions with links — which is far more concrete than a generic 'get day data'. It does not explicitly contrast itself with siblings like get_latest_view or get_wire, but the enumerated payload makes it distinguishable.

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?

It implies usage by noting it accepts a date 'or the latest' and is scoped to the last 90 trading days, which tells the agent when the tool is applicable. It offers no explicit when-not guidance and names no alternative tool for overlapping needs (e.g. latest-view or news tools).

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