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 the free-vs-paid cost distinction, but it does not explain what the status output contains, whether data freshness matters, or any limits.

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 two short sentences with no wasted explanation, and the FREE scope is front-loaded. The second sentence is terse to the point of being cryptic, but the overall structure is efficient.

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 simple zero-parameter read-only status tool, this covers the free/paid distinction and dataset location. But with no output schema, the description should clarify what 'status' and 'days available' actually return, which it does not.

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 input schema has zero parameters, so there are no parameter semantics to document in the description. Baseline 4 is appropriate for a no-argument tool.

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?

It identifies the resource as trading_history and says this is the FREE status under Collected_Data, but 'status' remains vague and the title's 'days available' is not explained. It does name paid bot_history/odds_history as different resources, giving some sibling context.

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 mention of paid bot_history/odds_history at $0.01 implies this free tool is for trading_history while those paid tools cover other history types. However, it never explicitly states when to use this tool, when not to use it, or what the paid alternatives provide.

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