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

Annotations already declare readOnly, idempotent, non-destructive and closed-world behavior, so the safety profile is covered. The description adds genuinely useful context beyond that: what the report contains, that it is written in plain English, and that it includes a link to the full report. It does not address recency semantics (how current 'latest' is) or update cadence, which is the remaining gap.

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 that identifies the source and resource first, then lists the payload contents. Every clause carries information; there is no filler or redundancy.

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 one-optional-parameter, read-only retrieval tool with no output schema, the description adequately conveys both purpose and the shape of the returned content. The only shortfall is the absence of any statement about report freshness or how far back the daily/weekly/monthly reports go.

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% and the single enum parameter already documents its values and the daily default. The description's 'for a day, week or month' merely restates the enum rather than adding format or behavior detail, so the baseline of 3 applies.

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 the exact resource (NewsStocks.live market analysis) and enumerates its contents: overview, market drivers, risks, and per-sector outlooks, plus a link to the full report. This content shape is clearly distinct from the sibling news/story tools, so an agent can select it without opening the schema.

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 for market commentary rather than news items, and the day/week/month phrasing hints at the granularity choice. There is no explicit when-to-use versus latest_news or search_news, and no stated exclusions or prerequisites.

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