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

The description adds genuine context beyond the annotations by disclosing plan-tier gating: base readings are available on Free, Standard and Pro, while the underlying signals require Standard or Pro. It does not disclose what happens when the optional parameters are omitted (e.g., all ten coins, today), which is the main behavioral unknown for a zero-required-parameter tool.

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 tightly packed sentence with the resource stated first and the tier caveat last. It is efficient, though the timeframe phrasing is compressed to the point of ambiguity against the schema enum.

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 read-only tool with two optional enum parameters and no output schema, the description covers what the readings contain and the plan gating. It falls short on default behavior when parameters are omitted and on reconciling the stated timeframes with the 4h/1d/1w enum.

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 0%, so the description must carry the parameter meaning, and it only does so partially. 'Ten large coins' explains the symbol enum, but the timeframe claim of 'today, this week and this month' does not match the actual enum of 4h/1d/1w — intraday 4h is never mentioned and no month option exists. Defaults for both optional parameters are left unstated.

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 uses a specific verb+resource framing: technical readings covering trend, momentum and stretch for ten large coins. It is clearly a market-analysis tool distinct from siblings like get_sentiment or get_story, though it never names an alternative to sharpen the boundary.

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 explicit when-to-use guidance, no prerequisites, and no mention of which sibling to prefer for related questions. 'Signals, not advice' is a disclaimer rather than usage direction, so the agent must infer the call context entirely.

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