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

Annotations already declare readOnlyHint=true, idempotentHint=true, destructiveHint=false, and openWorldHint=false, covering the safety profile. The description adds endpoint and cost (10 credits, Tier 1), which is useful operational context, but it does not disclose authentication needs or response behavior.

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?

The description is very short, front-loaded with the subject, and structured with clean metadata lines. It is efficient with no wasted words, though the opening phrase is too vague to fully earn its place as a functional description.

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?

Although an output schema and annotations exist, the description still does not state what the tool actually computes or returns, nor when to use it over sibling palmistry lines. Endpoint and cost are helpful but insufficient for confident tool selection.

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% and both optional parameters (fields and precision) are documented in the schema. The description adds no additional parameter meaning or syntax beyond what the schema already provides, so the baseline is 3.

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 gives a thematic phrase ('Intellect, mental approach') but no verb or explicit statement of what the tool returns or does. It does not differentiate from sibling palmistry line tools such as heart_line, life_line, fate_line, or marriage_line beyond the group label.

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, no exclusions, and no named alternatives. The group, endpoint, and cost metadata do not tell an agent when this tool is preferable to other palmistry tools.

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