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vandewilly

MCP Dice Roller

by vandewilly

roll_multiple

Roll any dice notation multiple times (1-20 rolls) with complete statistics for each result. Get instant summaries of all outcomes.

Instructions

Roll the same dice multiple times.

Args: notation: Dice notation (e.g., '1d20+5') times: Number of times to roll (1-20)

Returns: Dictionary with all roll results and statistics

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
timesNo
notationNo1d6
Behavior2/5

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

No annotations exist, and the description does not disclose behavioral traits beyond the obvious fact that rolling dice is non-destructive. It fails to mention any side effects, safety, or potential errors (e.g., domain of results).

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is very concise, with a clear one-line purpose and structured Args/Returns sections. No unnecessary words; every sentence adds value.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness4/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given the tool's simplicity and absence of output schema, the description adequately covers parameters and return format. However, the return dictionary could be more specific (e.g., what statistics are included), but it is still sufficient.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters4/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

The description adds meaning to both parameters: for 'times' it specifies a range (1-20) not in the schema, and for 'notation' it provides an example ('1d20+5'). It also describes the return value as a dictionary with results and statistics, which is absent from the schema.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states 'Roll the same dice multiple times,' which directly conveys the tool's action. It distinguishes from siblings like roll_dice (single roll) and roll_dnd_stats (different purpose), though it could explicitly mention when to use this over roll_dice.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines2/5

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. It does not state that this is for repeated rolls of the same notation, nor does it mention any exclusions or prerequisites.

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

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