OnlineCyberTools MCP (280+ filterable tools)

crypto_password_generator

Read-only

Generate cryptographically random passwords with configurable character classes, custom charsets, or pronounceable mode, excluding ambiguous characters if desired.

Instructions

Random Password Generator. Generate one or more cryptographically random passwords from configurable character classes (lowercase, uppercase, digits, symbols) with options for a custom charset, excluding look-alike or ambiguous characters, no repeated characters, and a pronounceable mode. Use this for dense mixed-character passwords; use crypto_password_generator_passphrase for memorable word-based passphrases or crypto_password_generator_pin for numeric-only codes. Randomness comes from crypto.getRandomValues. Runs locally on the input you provide: read-only, non-destructive, contacts no external service, and is rate-limited (30 requests/min, 200/hour, 1000/day for anonymous callers). Returns each password with its length and estimated entropy in bits, the normalized options actually applied, and the character set used.

Input Schema

TableJSON Schema

Name	Required	Description
`length`	No	Number of characters per password. Clamped to 4-128.
`includeUppercase`	No	Include uppercase letters A-Z in the character set.
`includeLowercase`	No	Include lowercase letters a-z in the character set.
`includeNumbers`	No	Include digits 0-9 in the character set.
`includeSymbols`	No	Include symbols from !@#$%&*+-=? in the character set.
`excludeSimilar`	No	Remove look-alike characters (0, O, 1, l, I) from the character set to improve readability.
`excludeAmbiguous`	No	Remove ambiguous punctuation ({}[]()/\'"`~,;.<>) from the character set.
`customCharset`	No	When set, overrides all include* options and draws every character from this exact string instead.
`noRepeating`	No	When true, no character repeats within a password; length must not exceed the character set size or the request fails.
`pronounceable`	No	When true, generate alternating consonant/vowel syllables for an easier-to-say password; includeNumbers/includeSymbols/ includeUppercase still inject those, and customCharset/ excludeSimilar/excludeAmbiguous/noRepeating do not apply.
`quantity`	No	How many passwords to generate. Clamped to 1-100.

Output Schema

TableJSON Schema

Name	Required	Description
`passwords`	No	The generated passwords, one entry per requested quantity.
`options`	No	The normalized options actually used after clamping defaults.
`charset`	No	The character set the passwords were drawn from.

Schema Changelog

Changes observed during successful MCP inspections.

Changed22 schema fields changedv0.5.1Jun 3, 2026

addedInput schema / additionalProperties
```
Added value: +false
```

addedInput schema / properties / customCharset

Added value: +{
+  "default": null,
+  "description": "When set, overrides all include* options and draws every character from this exact string instead.",
+  "type": [
+    "string",
+    "null"
+  ]
+}

addedInput schema / properties / excludeAmbiguous

Added value: +{
+  "default": false,
+  "description": "Remove ambiguous punctuation ({}[]()/\\'\"`~,;.<>) from the character set.",
+  "type": "boolean"
+}

addedInput schema / properties / excludeSimilar / default
```
Added value: +false
```

addedInput schema / properties / excludeSimilar / description

Added value: +"Remove look-alike characters (0, O, 1, l, I) from the character set to improve readability."

addedInput schema / properties / includeLowercase / default
```
Added value: +true
```

addedInput schema / properties / includeLowercase / description

Added value: +"Include lowercase letters a-z in the character set."

addedInput schema / properties / includeNumbers / default
```
Added value: +true
```
addedInput schema / properties / includeNumbers / description
```
Added value: +"Include digits 0-9 in the character set."
```
addedInput schema / properties / includeSymbols / default
```
Added value: +false
```

addedInput schema / properties / includeSymbols / description

Added value: +"Include symbols from !@#$%&*+-=? in the character set."

addedInput schema / properties / includeUppercase / default
```
Added value: +true
```

addedInput schema / properties / includeUppercase / description

Added value: +"Include uppercase letters A-Z in the character set."

addedInput schema / properties / length / default
```
Added value: +12
```

addedInput schema / properties / length / description

Added value: +"Number of characters per password. Clamped to 4-128."

addedInput schema / properties / noRepeating

Added value: +{
+  "default": false,
+  "description": "When true, no character repeats within a password; length must not exceed the character set size or the request fails.",
+  "type": "boolean"
+}

addedInput schema / properties / pronounceable

Added value: +{
+  "default": false,
+  "description": "When true, generate alternating consonant/vowel syllables for an easier-to-say password; includeNumbers/includeSymbols/ includeUppercase still inject those, and customCharset/ excludeSimilar/excludeAmbiguous/noRepeating do not apply.",
+  "type": "boolean"
+}

addedInput schema / properties / quantity / default
```
Added value: +1
```

addedInput schema / properties / quantity / description

Added value: +"How many passwords to generate. Clamped to 1-100."

changedInput schema / properties / quantity / maximum
```
Previous value: -50New value: +100
```
addedInput schema / required
```
Added value: +[]
```

changedOutput schema / (root)

Previous value: -nullNew value: +{
+  "properties": {
+    "charset": {
+      "description": "The character set the passwords were drawn from.",
+      "properties": {
+        "characters": {
+          "description": "The full character set string used.",
+          "type": "string"
+        },
+        "size": {
+          "description": "Number of distinct characters in the set.",
+          "type": "integer"
+        }
+      },
+      "type": "object"
+    },
+    "options": {
+      "description": "The normalized options actually used after clamping defaults.",
+      "properties": {
+        "customCharset": {
+          "description": "Custom character set used, or null.",
+          "type": [
+            "string",
+            "null"
+          ]
+        },
+        "excludeAmbiguous": {
+          "description": "Whether ambiguous punctuation was removed.",
+          "type": "boolean"
+        },
+        "excludeSimilar": {
+          "description": "Whether look-alike characters were removed.",
+          "type": "boolean"
+        },
+        "includeLowercase": {
+          "description": "Whether lowercase letters were included.",
+          "type": "boolean"
+        },
+        "includeNumbers": {
+          "description": "Whether digits were included.",
+          "type": "boolean"
+        },
+        "includeSymbols": {
+          "description": "Whether symbols were included.",
+          "type": "boolean"
+        },
+        "includeUppercase": {
+          "description": "Whether uppercase letters were included.",
+          "type": "boolean"
+        },
+        "length": {
+          "description": "Effective character length applied.",
+          "type": "integer"
+        },
+        "noRepeating": {
+          "description": "Whether repeated characters were disallowed.",
+          "type": "boolean"
+        },
+        "pronounceable": {
+          "description": "Whether pronounceable mode was used.",
+          "type": "boolean"
+        },
+        "quantity": {
+          "description": "Number of passwords generated.",
+          "type": "integer"
+        }
+      },
+      "type": "object"
+    },
+    "passwords": {
+      "description": "The generated passwords, one entry per requested quantity.",
+      "items": {
+        "properties": {
+          "entropy": {
+            "description": "Estimated password entropy in bits, based on the character set size and length.",
+            "type": "number"
+          },
+          "length": {
+            "description": "Character length of this password.",
+            "type": "integer"
+          },
+          "password": {
+            "description": "The generated password string.",
+            "type": "string"
+          }
+        },
+        "type": "object"
+      },
+      "type": "array"
+    }
+  },
+  "type": "object"
+}

First observedv0.1.0May 31, 2026

TDQS

A4.9/5.0

Behavior5/5

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

Annotations already provide readOnlyHint=true and destructiveHint=false. The description adds valuable context: uses crypto.getRandomValues, runs locally (read-only, non-destructive), contacts no external service, is rate-limited (30/min, 200/hr, 1000/day), and returns each password with length and estimated entropy. This fully informs behavior 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.

Conciseness5/5

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

The description is appropriately sized with a clear structure: purpose, features, usage guidelines, safety, return info. Every sentence provides value; no fluff. It front-loads the core purpose and guides agent decision-making efficiently.

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?

Given the tool's complexity (11 parameters, many interdependent options) and the existence of an output schema, the description is comprehensive. It covers all essential aspects: what the tool does, when to use it, behavior, safety, rate limits, and return format. No gaps identified.

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 100%, so parameters are well-documented. The description adds semantic value by explaining interactions: customCharset overrides include* options, noRepeating constraint, pronounceable mode limitations. This helps agents understand parameter dependencies without repeating schema details.

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 clearly states it is a random password generator that generates cryptographically random passwords from configurable character classes, and distinguishes itself from sibling tools (passphrase for word-based, pin for numeric-only). The verb 'Generate' and resource 'cryptographically random passwords' are specific and unambiguous.

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

Usage Guidelines5/5

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

Explicitly states when to use this tool ('dense mixed-character passwords') and when to use alternatives ('crypto_password_generator_passphrase' for memorable word-based, 'crypto_password_generator_pin' for numeric-only). Also notes randomness source and local execution, providing clear context.

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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