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

Annotations already declare readOnlyHint=true and openWorldHint=false, so the safety profile is covered; the description adds return shape (date, Eastern time, one line on relevance) and cost/access status ('Free'). It does not discuss the 14-day ceiling or ordering behavior beyond the schema, which is a minor 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?

It is front-loaded with the 'Use for' clause and every sentence carries content: what it returns, an example, the sibling alternative, and cost. The clipped fragments ('Free.', the example sentence) are efficient but slightly telegraphic.

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 a single optional parameter, full schema coverage, an output schema, and annotations, this is a simple tool; the description nonetheless covers content, return fields, routing to a sibling, and cost. Nothing an agent needs to call it correctly is missing.

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% with a bounded 1–14 range and a documented default, so the baseline is 3. The description earns an extra point by giving a concrete usage example for the window ('days 3'), showing intent rather than just type constraints.

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 resource concretely — upcoming Bitcoin-moving events — and enumerates its contents (macro releases such as CPI/jobs/Fed, options expiries, difficulty adjustment, Bitcoin dates) plus what each entry carries (date, Eastern time, one-line rationale). It explicitly separates itself from get_bitcoin_today, so an agent can pick between them without opening a 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?

It opens with a direct 'Use for...' instruction and names the alternative and its condition: 'For today's read and its forces use get_bitcoin_today.' The worked example ('days 3 lists what lands before the weekend') shows how to apply the window parameter in practice.

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