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

Annotations already declare readOnlyHint, idempotentHint, and destructiveHint=false, so safety is covered. The description adds the credit cost (10 credits, Tier 1) and the shape of the analysis, but does not disclose limits on sequence (max 8 digits), failure behavior, or any rate/auth constraints beyond annotations.

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?

Front-loaded with the core action in one sentence, with endpoint, required-parameter, and cost metadata bracketed separately and easy to scan. Every element earns its place; only the lack of any sibling-routing sentence leaves a small structural gap.

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 the return values need not be spelled out, and annotations cover the safety profile. The description adequately covers the two undocumented params and the required field, though the sibling-routing context within the angel-numbers family remains absent.

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 50%: 'fields' and 'precision' are documented in-schema, while 'context' and 'sequence' are not. The description partially compensates by implying 'numeric sequence' and 'optional life context', but adds no format, range, or semantics beyond the parameter names themselves.

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+resource ('Decode a numeric sequence') and names the returned artifacts (pattern classification, exact match, reduced single-digit meaning). It does not differentiate itself from the close sibling astroway_esoteric_angel_numbers_number, leaving ambiguity about sequence vs single number.

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 phrase 'in optional life context' hints at when the context parameter matters, but there is no explicit when-to-use, when-not-to-use, or routing to alternatives such as angel_numbers_number or angel_numbers_today. The agent gets no guidance on selecting among the four angel-number siblings.

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