Random Number MCP

random_float

Generate a random float between a specified low and high bound, providing controlled decimal randomness for simulations, games, or data sampling.

Instructions

Generate a random float between low and high.

Args: low: Lower bound (default 0.0) high: Upper bound (default 1.0)

Returns: Random float between low and high

Tool call template

This tool declares no required parameters. Add optional parameters from the input schema as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {},
    "name": "random_float"
  }
}

Input Schema

Name	Required	Description	Default
`low`	No
`high`	No

Output Schema

Name	Required	Description	Default
`result`	Yes

Schema Changelog

Changes observed during successful MCP inspections.

Changed5 schema fields changedv0.1.0May 2, 2026
- removedInput schema / properties / high / title
```
Removed value: -"High"
```
- removedInput schema / properties / low / title
```
Removed value: -"Low"
```
- addedOutput schema / description
```
Added value: +"Generic wrapper for non-object return types."
```
- removedOutput schema / properties / result / title
```
Removed value: -"Result"
```
- removedOutput schema / title
```
Removed value: -"_WrappedResult"
```
First observedv1.0.0Aug 15, 2025

TDQS

A4.1/5.0

Behavior3/5

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

No annotations provided, so the description carries the full burden. It describes the generation of floats within bounds with defaults, but does not disclose whether the randomness is cryptographically secure (especially relevant given sibling secure_random_int). It also does not specify inclusivity of bounds.

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 extremely concise with a clearly structured format using bullet points. Every sentence adds value and there is no superfluous content.

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

Completeness5/5

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

For a simple tool with two parameters and an output schema, the description is complete. It covers purpose, parameters, and return value adequately without missing critical information.

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?

Schema coverage is 0%, so the description compensates well by explaining the meaning and defaults of 'low' and 'high'. However, it does not specify whether the bounds are inclusive or exclusive, which could affect usage.

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

Purpose5/5

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

The description uses the specific verb 'Generate' and clearly identifies the resource as a 'random float between low and high'. It distinguishes from sibling tools like random_int (integer) and random_shuffle (shuffling sequence).

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

Usage Guidelines3/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description implies usage for generating random floats but does not explicitly state when to use this tool over alternatives such as random_int or secure_random_int. No guidance on 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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