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

Beyond the readOnlyHint and non-destructiveHint annotations, the description adds valuable behavioral context by disclosing automatic detection of Master Numbers and Karmic Debt numbers, and confirming the output includes detailed 300-500 word interpretations with categories. This meaningfully expands on what the schema alone does not reveal about the tool's 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 informative but somewhat overstuffed with promotional and generic use-case language, such as 'Perfect for numerology apps' and 'most significant.' The first sentence is clear and front-loaded, but the second half is more marketing-driven than instruction-driven. While not excessively long, it could be tightened to focus solely on the calculation and output.

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?

The description offers a good high-level outline of the output, including the types of interpretation and typical length, which is helpful because there is no output schema. However, it does not specify the exact response structure, field names, or how the compact parameter affects the result shape. Given the five-parameter surface and no output schema, a little more concrete detail on return format would make it fully 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?

The input schema has 100% description coverage for all five parameters, including clear ranges, examples, and defaults. The description does not need to repeat these details, and it accurately references the core birth-date inputs. There is no added semantic information about parameters beyond the schema, so the baseline of 3 is appropriate.

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 clearly states the tool calculates the Life Path number from a birth date using Pythagorean numerology, which is a specific verb plus resource. It also adds meaningful context about output content and special number detection. However, it does not explicitly differentiate itself from the many sibling numerology tools, such as post_numerology_karmic_debt or post_numerology_compatibility, even though it mentions those topics.

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 description implies the tool is for general Life Path readings, but gives no explicit guidance on when to choose this tool over siblings like post_numerology_karmic_debt or post_numerology_compatibility. Mentioning relationship compatibility and Karmic Debt numbers in this description could actually mislead an agent into selecting the wrong, more specialized tool.

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