9-Rune Cast

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

Annotations already declare readOnlyHint=true, destructiveHint=false, idempotentHint=true, so the agent knows this is a safe read operation. The description adds the layout name (Pennick) but no further behavioral context like randomness, output format, or side effects.

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 concise with one sentence plus a group label and example. While brief, it is front-loaded and wastes no words, but could benefit from structured breakdown of parameters.

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 complexity (3 undocumented parameters, no output schema, multiple sibling tools), the description is insufficient. It fails to explain the Pennick layout, how seed affects results, what question does, or what the output looks like. The example hints at seed usage but leaves major gaps.

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 0%, placing full burden on the description. The description only shows an example with the 'seed' parameter, leaving 'question' and 'allowReversed' unexplained. Their purposes (e.g., seed for reproducibility, question for focus, allowReversed for reversed runes) are not clarified.

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 specifies 'Pennick layout 9-rune cast' and groups as Elder Futhark Runes, indicating a specific rune cast with 9 runes. This differentiates it from siblings like runes_single or runes_three, but does not explicitly state the verb (e.g., 'performs' or 'generates').

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 guidance on when to use this tool versus alternatives such as runes_single or runes_three. The description does not mention use cases, prerequisites, or scenarios where this layout is preferred.

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