getCryptocurrencyHistoricalLightChart

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

Annotations already declare readOnlyHint, idempotentHint, and openWorldHint, so the safety profile is covered. The description adds useful context that this returns end-of-day data and includes price and trading volume, but it omits the key behavioral distinction of a 'light' endpoint—namely which fields or data points are excluded compared with the full chart. It also says nothing about pagination, date-range limits, or defaults.

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?

Two sentences, front-loaded with the primary purpose: historical end-of-day cryptocurrency prices. The second sentence is somewhat generic marketing language ('to better understand market behavior') but it also conveys the returned dimensions (price and trading volume), so it is not entirely 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?

For a three-parameter historical data tool with no output schema and with a sibling 'FullChart' endpoint, the description should explain the light-versus-full distinction and date-range behavior. It covers the basic purpose but leaves out these operationally important details, making it only adequately complete.

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%, so all three parameters (symbol, from_date, to) are already documented in the schema with types and formats. The description adds no additional parameter meaning, such as whether from_date/to are optional with defaults or what happens when only symbol is supplied. Baseline 3 is appropriate when the schema carries the parameter burden.

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 states a specific verb and resource: access historical end-of-day cryptocurrency prices. It distinguishes from intraday siblings (1-minute, 5-minute, 1-hour data) by specifying end-of-day, but it never explains what 'Light' means relative to the sibling getCryptocurrencyHistoricalFullChart, so the agent cannot confidently choose between the two.

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?

There is no when-to-use guidance at all: no mention of when to choose this over getCryptocurrencyHistoricalFullChart, no prerequisites, and no note that 'symbol' is required. The only hint is the generic 'track trends' phrasing, which does not help an agent decide between alternatives.

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