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

Annotations already show readOnlyHint=true and destructiveHint=false, so this is clearly a safe read. The description adds useful behavior beyond that: response length of 300-500 words, expert-written content, included fields, and special handling of master numbers 11, 22, and 33 with their reduced base number.

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 front-loaded with the main purpose and then adds useful details about output content and lengths. It is slightly redundant in that both the first and last sentences emphasize that complete meanings are returned, but overall it is compact and scannable.

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?

Given the lack of an output schema, the description provides a strong outline of what will be returned: archetype title, keywords, personality traits, strengths, weaknesses, career guidance, relationship dynamics, and spiritual insights. It also covers master-number expansion behavior and output length, which gives an agent enough context for selection and invocation.

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 coverage is 100%, so the schema already explains number, lang, and compact well. The description reinforces the allowed number range and clarifies the master-number behavior, but it does not add meaningful semantic details for lang or compact beyond what the schema provides.

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 action and resource: get the complete numerology meaning for any valid number (1-9, 11, 22, 33). It also scopes the tool to Pythagorean numerology and enumerates the 12 valid numbers, which distinguishes it from sibling tools like the Chaldean or compound-number tools.

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 explicitly lists applicable use cases: 'numerology reference tools, educational apps, quick lookups, and building custom numerology calculators.' This gives clear context for when to use the tool, though it never explicitly mentions when-not-to-use it or points to an alternative sibling.

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