TinyFn

random_string_2

Generate random string(s) from specified character set.

Input Schema

Name	Required	Description	Default
`count`	No	Number of strings to generate
`length`	No	Length of the string
`charset`	No	Character set: alphanumeric, alpha, numeric, lowercase, uppercase, hex, base64, ascii, symbols	alphanumeric

Output Schema

Name	Required	Description	Default
`count`	No
`value`	No
`length`	No
`values`	No
`charset`	No

Schema Changelog

Changes observed during successful MCP inspections.

Changed3 schema fields changedOct 23, 2026

addedOutput schema / $defs / RandomStringResponse

Added value: +{
+  "properties": {
+    "charset": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Charset"
+    },
+    "count": {
+      "anyOf": [
+        {
+          "type": "integer"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Count"
+    },
+    "length": {
+      "anyOf": [
+        {
+          "type": "integer"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Length"
+    },
+    "value": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Value"
+    },
+    "values": {
+      "anyOf": [
+        {
+          "items": {
+            "type": "string"
+          },
+          "type": "array"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Values"
+    }
+  },
+  "title": "RandomStringResponse",
+  "type": "object"
+}

removedOutput schema / $defs / app__routers__random_utils__RandomStringResponse

Removed value: -{
-  "properties": {
-    "charset": {
-      "anyOf": [
-        {
-          "type": "string"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Charset"
-    },
-    "count": {
-      "anyOf": [
-        {
-          "type": "integer"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Count"
-    },
-    "length": {
-      "anyOf": [
-        {
-          "type": "integer"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Length"
-    },
-    "value": {
-      "anyOf": [
-        {
-          "type": "string"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Value"
-    },
-    "values": {
-      "anyOf": [
-        {
-          "items": {
-            "type": "string"
-          },
-          "type": "array"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Values"
-    }
-  },
-  "title": "RandomStringResponse",
-  "type": "object"
-}

changedOutput schema / x-fastmcp-top-level-schema

Previous value: -"app__routers__random_utils__RandomStringResponse"New value: +"RandomStringResponse"

Changed3 schema fields changedAug 29, 2026

removedOutput schema / $defs / RandomStringResponse

Removed value: -{
-  "properties": {
-    "charset": {
-      "anyOf": [
-        {
-          "type": "string"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Charset"
-    },
-    "count": {
-      "anyOf": [
-        {
-          "type": "integer"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Count"
-    },
-    "length": {
-      "anyOf": [
-        {
-          "type": "integer"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Length"
-    },
-    "value": {
-      "anyOf": [
-        {
-          "type": "string"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Value"
-    },
-    "values": {
-      "anyOf": [
-        {
-          "items": {
-            "type": "string"
-          },
-          "type": "array"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Values"
-    }
-  },
-  "title": "RandomStringResponse",
-  "type": "object"
-}

addedOutput schema / $defs / app__routers__random_utils__RandomStringResponse

Added value: +{
+  "properties": {
+    "charset": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Charset"
+    },
+    "count": {
+      "anyOf": [
+        {
+          "type": "integer"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Count"
+    },
+    "length": {
+      "anyOf": [
+        {
+          "type": "integer"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Length"
+    },
+    "value": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Value"
+    },
+    "values": {
+      "anyOf": [
+        {
+          "items": {
+            "type": "string"
+          },
+          "type": "array"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Values"
+    }
+  },
+  "title": "RandomStringResponse",
+  "type": "object"
+}

changedOutput schema / x-fastmcp-top-level-schema

Previous value: -"RandomStringResponse"New value: +"app__routers__random_utils__RandomStringResponse"

Changed3 schema fields changedAug 29, 2026

addedOutput schema / $defs / RandomStringResponse

Added value: +{
+  "properties": {
+    "charset": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Charset"
+    },
+    "count": {
+      "anyOf": [
+        {
+          "type": "integer"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Count"
+    },
+    "length": {
+      "anyOf": [
+        {
+          "type": "integer"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Length"
+    },
+    "value": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Value"
+    },
+    "values": {
+      "anyOf": [
+        {
+          "items": {
+            "type": "string"
+          },
+          "type": "array"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Values"
+    }
+  },
+  "title": "RandomStringResponse",
+  "type": "object"
+}

removedOutput schema / $defs / app__routers__random_utils__RandomStringResponse

Removed value: -{
-  "properties": {
-    "charset": {
-      "anyOf": [
-        {
-          "type": "string"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Charset"
-    },
-    "count": {
-      "anyOf": [
-        {
-          "type": "integer"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Count"
-    },
-    "length": {
-      "anyOf": [
-        {
-          "type": "integer"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Length"
-    },
-    "value": {
-      "anyOf": [
-        {
-          "type": "string"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Value"
-    },
-    "values": {
-      "anyOf": [
-        {
-          "items": {
-            "type": "string"
-          },
-          "type": "array"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Values"
-    }
-  },
-  "title": "RandomStringResponse",
-  "type": "object"
-}

changedOutput schema / x-fastmcp-top-level-schema

Previous value: -"app__routers__random_utils__RandomStringResponse"New value: +"RandomStringResponse"

Changed3 schema fields changedJul 27, 2026

removedOutput schema / $defs / RandomStringResponse

Removed value: -{
-  "properties": {
-    "charset": {
-      "anyOf": [
-        {
-          "type": "string"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Charset"
-    },
-    "count": {
-      "anyOf": [
-        {
-          "type": "integer"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Count"
-    },
-    "length": {
-      "anyOf": [
-        {
-          "type": "integer"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Length"
-    },
-    "value": {
-      "anyOf": [
-        {
-          "type": "string"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Value"
-    },
-    "values": {
-      "anyOf": [
-        {
-          "items": {
-            "type": "string"
-          },
-          "type": "array"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Values"
-    }
-  },
-  "title": "RandomStringResponse",
-  "type": "object"
-}

addedOutput schema / $defs / app__routers__random_utils__RandomStringResponse

Added value: +{
+  "properties": {
+    "charset": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Charset"
+    },
+    "count": {
+      "anyOf": [
+        {
+          "type": "integer"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Count"
+    },
+    "length": {
+      "anyOf": [
+        {
+          "type": "integer"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Length"
+    },
+    "value": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Value"
+    },
+    "values": {
+      "anyOf": [
+        {
+          "items": {
+            "type": "string"
+          },
+          "type": "array"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Values"
+    }
+  },
+  "title": "RandomStringResponse",
+  "type": "object"
+}

changedOutput schema / x-fastmcp-top-level-schema

Previous value: -"RandomStringResponse"New value: +"app__routers__random_utils__RandomStringResponse"

Changed3 schema fields changedJul 17, 2026

addedOutput schema / $defs / RandomStringResponse

Added value: +{
+  "properties": {
+    "charset": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Charset"
+    },
+    "count": {
+      "anyOf": [
+        {
+          "type": "integer"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Count"
+    },
+    "length": {
+      "anyOf": [
+        {
+          "type": "integer"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Length"
+    },
+    "value": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Value"
+    },
+    "values": {
+      "anyOf": [
+        {
+          "items": {
+            "type": "string"
+          },
+          "type": "array"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Values"
+    }
+  },
+  "title": "RandomStringResponse",
+  "type": "object"
+}

removedOutput schema / $defs / app__routers__random_utils__RandomStringResponse

Removed value: -{
-  "properties": {
-    "charset": {
-      "anyOf": [
-        {
-          "type": "string"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Charset"
-    },
-    "count": {
-      "anyOf": [
-        {
-          "type": "integer"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Count"
-    },
-    "length": {
-      "anyOf": [
-        {
-          "type": "integer"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Length"
-    },
-    "value": {
-      "anyOf": [
-        {
-          "type": "string"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Value"
-    },
-    "values": {
-      "anyOf": [
-        {
-          "items": {
-            "type": "string"
-          },
-          "type": "array"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Values"
-    }
-  },
-  "title": "RandomStringResponse",
-  "type": "object"
-}

changedOutput schema / x-fastmcp-top-level-schema

Previous value: -"app__routers__random_utils__RandomStringResponse"New value: +"RandomStringResponse"

Changed3 schema fields changedJul 13, 2026

removedOutput schema / $defs / RandomStringResponse

Removed value: -{
-  "properties": {
-    "charset": {
-      "anyOf": [
-        {
-          "type": "string"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Charset"
-    },
-    "count": {
-      "anyOf": [
-        {
-          "type": "integer"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Count"
-    },
-    "length": {
-      "anyOf": [
-        {
-          "type": "integer"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Length"
-    },
-    "value": {
-      "anyOf": [
-        {
-          "type": "string"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Value"
-    },
-    "values": {
-      "anyOf": [
-        {
-          "items": {
-            "type": "string"
-          },
-          "type": "array"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Values"
-    }
-  },
-  "title": "RandomStringResponse",
-  "type": "object"
-}

addedOutput schema / $defs / app__routers__random_utils__RandomStringResponse

Added value: +{
+  "properties": {
+    "charset": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Charset"
+    },
+    "count": {
+      "anyOf": [
+        {
+          "type": "integer"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Count"
+    },
+    "length": {
+      "anyOf": [
+        {
+          "type": "integer"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Length"
+    },
+    "value": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Value"
+    },
+    "values": {
+      "anyOf": [
+        {
+          "items": {
+            "type": "string"
+          },
+          "type": "array"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Values"
+    }
+  },
+  "title": "RandomStringResponse",
+  "type": "object"
+}

changedOutput schema / x-fastmcp-top-level-schema

Previous value: -"RandomStringResponse"New value: +"app__routers__random_utils__RandomStringResponse"

Changed3 schema fields changedJul 8, 2026

addedOutput schema / $defs / RandomStringResponse

Added value: +{
+  "properties": {
+    "charset": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Charset"
+    },
+    "count": {
+      "anyOf": [
+        {
+          "type": "integer"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Count"
+    },
+    "length": {
+      "anyOf": [
+        {
+          "type": "integer"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Length"
+    },
+    "value": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Value"
+    },
+    "values": {
+      "anyOf": [
+        {
+          "items": {
+            "type": "string"
+          },
+          "type": "array"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Values"
+    }
+  },
+  "title": "RandomStringResponse",
+  "type": "object"
+}

removedOutput schema / $defs / app__routers__random_utils__RandomStringResponse

Removed value: -{
-  "properties": {
-    "charset": {
-      "anyOf": [
-        {
-          "type": "string"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Charset"
-    },
-    "count": {
-      "anyOf": [
-        {
-          "type": "integer"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Count"
-    },
-    "length": {
-      "anyOf": [
-        {
-          "type": "integer"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Length"
-    },
-    "value": {
-      "anyOf": [
-        {
-          "type": "string"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Value"
-    },
-    "values": {
-      "anyOf": [
-        {
-          "items": {
-            "type": "string"
-          },
-          "type": "array"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Values"
-    }
-  },
-  "title": "RandomStringResponse",
-  "type": "object"
-}

changedOutput schema / x-fastmcp-top-level-schema

Previous value: -"app__routers__random_utils__RandomStringResponse"New value: +"RandomStringResponse"

First observedJun 27, 2026

TDQS

C2.9/5.0

Behavior2/5

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

With no annotations, the description should disclose behavioral traits like randomness properties, uniqueness, or security. It fails to do so, stating only generation without context on side effects or guarantees.

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

Conciseness4/5

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

The description is a single concise sentence, front-loading the core action. However, conciseness sacrifices completeness, but it remains clear and to the point.

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

Completeness3/5

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

Given the output schema exists and parameters are fully described, the description is adequate but minimal. It covers the basic purpose but lacks details on output format or randomness characteristics. Completeness is sufficient for a simple tool.

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

Parameters3/5

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

Schema coverage is 100%, and the description adds minimal value beyond the schema (e.g., 'from specified character set' matches the charset parameter). Baseline of 3 is appropriate as it neither contradicts nor enriches parameter meaning.

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 it generates random strings from a specified character set, which is a specific verb and resource. It distinguishes from sibling tools like random_text or random_password, but could be more explicit about its uniqueness compared to random_string.

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 is provided on when to use this tool versus alternatives such as random_string, random_password, or random_text. The description does not include any when-to-use or when-not-to-use information.

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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random_string_2

Input Schema

Output Schema

Schema Changelog

TDQS

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