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

Annotations already declare readOnlyHint, idempotentHint, non-destructive, and a closed-world scope, so the safety profile is covered. The description usefully adds the cost ('10 credits, Tier 1') and the POST endpoint, which is real behavioral context beyond the annotations, but says nothing about what the calculation returns or any input constraints.

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?

Compact and front-loaded: the core action leads, followed by bracketed metadata lines. No wasted prose, though the bracket-tag format is more machine-oriented than descriptive.

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?

An output schema exists, so return values needn't be explained, and annotations cover safety. However, for a tool with a documented output and two undocumented input params, the description omits usage routing and any note on the name/date semantics, leaving an agent to infer a fair amount.

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 50%: 'fields' and 'precision' are well documented in the schema, but 'name' and 'date' carry no schema descriptions. The description adds 'year + month + day, reduced' for the date and restates the two required params, giving marginal clarification over the pattern already in the schema.

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?

States a specific verb (Calculate) and resource (Life Path number) with the input basis (birth date, year+month+day reduced) and names the numerological system (Chaldean). This distinguishes it from the Pythagorean, Kabbalistic, and Vedic life-path siblings, though it does not differentiate from other Chaldean tools. Clear and specific, but largely echoes the title.

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?

No when-to-use guidance or alternatives are offered. The bracket tags give required params, endpoint, and cost, but never explain when Chaldean life-path is preferred over the many other life-path tools. The agent must infer usage from the name alone.

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