TinyFn

prettify_json

Prettify (format) a JSON string.

Input Schema

TableJSON Schema

Name	Required	Description
`indent`	No	Indentation spaces
`sort_keys`	No	Sort keys alphabetically
`json_string`	Yes	JSON string to prettify

Output Schema

TableJSON Schema

Name	Required	Description	Default
`error`	No
`valid`	No
`prettified`	No
`original_length`	No
`prettified_length`	No

Schema Changelog

Changes observed during successful MCP inspections. Dates show when Glama detected each change.

Changed3 schema fields changedAug 29, 2026

addedOutput schema / $defs / JsonPrettifyResponse

Added value: +{
+  "properties": {
+    "error": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Error"
+    },
+    "original_length": {
+      "anyOf": [
+        {
+          "type": "integer"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Original Length"
+    },
+    "prettified": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Prettified"
+    },
+    "prettified_length": {
+      "anyOf": [
+        {
+          "type": "integer"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Prettified Length"
+    },
+    "valid": {
+      "anyOf": [
+        {
+          "type": "boolean"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Valid"
+    }
+  },
+  "title": "JsonPrettifyResponse",
+  "type": "object"
+}

removedOutput schema / $defs / app__routers__json_utils__JsonPrettifyResponse

Removed value: -{
-  "properties": {
-    "error": {
-      "anyOf": [
-        {
-          "type": "string"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Error"
-    },
-    "original_length": {
-      "anyOf": [
-        {
-          "type": "integer"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Original Length"
-    },
-    "prettified": {
-      "anyOf": [
-        {
-          "type": "string"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Prettified"
-    },
-    "prettified_length": {
-      "anyOf": [
-        {
-          "type": "integer"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Prettified Length"
-    },
-    "valid": {
-      "anyOf": [
-        {
-          "type": "boolean"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Valid"
-    }
-  },
-  "title": "JsonPrettifyResponse",
-  "type": "object"
-}

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

Previous value: -"app__routers__json_utils__JsonPrettifyResponse"New value: +"JsonPrettifyResponse"

Changed3 schema fields changedAug 29, 2026

removedOutput schema / $defs / JsonPrettifyResponse

Removed value: -{
-  "properties": {
-    "error": {
-      "anyOf": [
-        {
-          "type": "string"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Error"
-    },
-    "original_length": {
-      "anyOf": [
-        {
-          "type": "integer"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Original Length"
-    },
-    "prettified": {
-      "anyOf": [
-        {
-          "type": "string"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Prettified"
-    },
-    "prettified_length": {
-      "anyOf": [
-        {
-          "type": "integer"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Prettified Length"
-    },
-    "valid": {
-      "anyOf": [
-        {
-          "type": "boolean"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Valid"
-    }
-  },
-  "title": "JsonPrettifyResponse",
-  "type": "object"
-}

addedOutput schema / $defs / app__routers__json_utils__JsonPrettifyResponse

Added value: +{
+  "properties": {
+    "error": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Error"
+    },
+    "original_length": {
+      "anyOf": [
+        {
+          "type": "integer"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Original Length"
+    },
+    "prettified": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Prettified"
+    },
+    "prettified_length": {
+      "anyOf": [
+        {
+          "type": "integer"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Prettified Length"
+    },
+    "valid": {
+      "anyOf": [
+        {
+          "type": "boolean"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Valid"
+    }
+  },
+  "title": "JsonPrettifyResponse",
+  "type": "object"
+}

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

Previous value: -"JsonPrettifyResponse"New value: +"app__routers__json_utils__JsonPrettifyResponse"

Changed3 schema fields changedJul 27, 2026

addedOutput schema / $defs / JsonPrettifyResponse

Added value: +{
+  "properties": {
+    "error": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Error"
+    },
+    "original_length": {
+      "anyOf": [
+        {
+          "type": "integer"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Original Length"
+    },
+    "prettified": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Prettified"
+    },
+    "prettified_length": {
+      "anyOf": [
+        {
+          "type": "integer"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Prettified Length"
+    },
+    "valid": {
+      "anyOf": [
+        {
+          "type": "boolean"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Valid"
+    }
+  },
+  "title": "JsonPrettifyResponse",
+  "type": "object"
+}

removedOutput schema / $defs / app__routers__json_utils__JsonPrettifyResponse

Removed value: -{
-  "properties": {
-    "error": {
-      "anyOf": [
-        {
-          "type": "string"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Error"
-    },
-    "original_length": {
-      "anyOf": [
-        {
-          "type": "integer"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Original Length"
-    },
-    "prettified": {
-      "anyOf": [
-        {
-          "type": "string"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Prettified"
-    },
-    "prettified_length": {
-      "anyOf": [
-        {
-          "type": "integer"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Prettified Length"
-    },
-    "valid": {
-      "anyOf": [
-        {
-          "type": "boolean"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Valid"
-    }
-  },
-  "title": "JsonPrettifyResponse",
-  "type": "object"
-}

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

Previous value: -"app__routers__json_utils__JsonPrettifyResponse"New value: +"JsonPrettifyResponse"

Changed3 schema fields changedJul 27, 2026

removedOutput schema / $defs / JsonPrettifyResponse

Removed value: -{
-  "properties": {
-    "error": {
-      "anyOf": [
-        {
-          "type": "string"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Error"
-    },
-    "original_length": {
-      "anyOf": [
-        {
-          "type": "integer"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Original Length"
-    },
-    "prettified": {
-      "anyOf": [
-        {
-          "type": "string"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Prettified"
-    },
-    "prettified_length": {
-      "anyOf": [
-        {
-          "type": "integer"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Prettified Length"
-    },
-    "valid": {
-      "anyOf": [
-        {
-          "type": "boolean"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Valid"
-    }
-  },
-  "title": "JsonPrettifyResponse",
-  "type": "object"
-}

addedOutput schema / $defs / app__routers__json_utils__JsonPrettifyResponse

Added value: +{
+  "properties": {
+    "error": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Error"
+    },
+    "original_length": {
+      "anyOf": [
+        {
+          "type": "integer"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Original Length"
+    },
+    "prettified": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Prettified"
+    },
+    "prettified_length": {
+      "anyOf": [
+        {
+          "type": "integer"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Prettified Length"
+    },
+    "valid": {
+      "anyOf": [
+        {
+          "type": "boolean"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Valid"
+    }
+  },
+  "title": "JsonPrettifyResponse",
+  "type": "object"
+}

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

Previous value: -"JsonPrettifyResponse"New value: +"app__routers__json_utils__JsonPrettifyResponse"

Changed3 schema fields changedJul 2, 2026

addedOutput schema / $defs / JsonPrettifyResponse

Added value: +{
+  "properties": {
+    "error": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Error"
+    },
+    "original_length": {
+      "anyOf": [
+        {
+          "type": "integer"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Original Length"
+    },
+    "prettified": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Prettified"
+    },
+    "prettified_length": {
+      "anyOf": [
+        {
+          "type": "integer"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Prettified Length"
+    },
+    "valid": {
+      "anyOf": [
+        {
+          "type": "boolean"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Valid"
+    }
+  },
+  "title": "JsonPrettifyResponse",
+  "type": "object"
+}

removedOutput schema / $defs / app__routers__json_utils__JsonPrettifyResponse

Removed value: -{
-  "properties": {
-    "error": {
-      "anyOf": [
-        {
-          "type": "string"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Error"
-    },
-    "original_length": {
-      "anyOf": [
-        {
-          "type": "integer"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Original Length"
-    },
-    "prettified": {
-      "anyOf": [
-        {
-          "type": "string"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Prettified"
-    },
-    "prettified_length": {
-      "anyOf": [
-        {
-          "type": "integer"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Prettified Length"
-    },
-    "valid": {
-      "anyOf": [
-        {
-          "type": "boolean"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Valid"
-    }
-  },
-  "title": "JsonPrettifyResponse",
-  "type": "object"
-}

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

Previous value: -"app__routers__json_utils__JsonPrettifyResponse"New value: +"JsonPrettifyResponse"

First observedJun 27, 2026

TDQS

B3.4/5.0

Behavior2/5

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

No annotations are provided, so the description carries the full burden of behavioral disclosure. It only states the operation and does not mention return type, invalid-JSON behavior, whether this is a pure read-only transformation, or any other behavioral characteristics.

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 a single concise sentence with no filler. It is front-loaded with the core verb and resource, and every word contributes to the meaning.

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?

For a simple pure formatting utility, the description plus the fully documented schema and an output schema are largely sufficient for an agent to call the tool correctly. The only meaningful gap is lack of guidance around duplicate or related JSON tools like json_prettify and minify_json.

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 description coverage is 100%, so the schema already documents all three parameters well. The description adds no additional parameter semantics beyond the purpose, which is acceptable but does not exceed the baseline.

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 the operation: prettify/format a JSON string, which is specific and unambiguous. However, it does not distinguish this tool from the sibling json_prettify or from minify_json, so it misses the differentiation needed for a 5.

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 usage context is implied by the description itself—use this when you want an indented, formatted JSON string. There is no explicit guidance about when to prefer prettify_json over json_prettify or minify_json, and no exclusions or alternatives are named.

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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TDQS

C2.3/5.0

Disambiguation2/5

Many tools have overlapping purposes, such as multiple random generators (random_integer, random_number), duplicate hashing functions (hash_md5, md5_checksum), and near-identical tools (compare, compare_2, compare_decimals). The sheer number of tools and lack of clear boundaries make it difficult for an agent to differentiate.

Naming Consistency1/5

Naming is highly inconsistent. There are duplicate tools with different names (camel_case vs to_camel_case, slug vs slugify), arbitrary suffixes like '_2', and mixing of patterns (e.g., generate_password vs password_entropy). No clear convention is followed.

Tool Count1/5

With 572 tools, the server is massively overpopulated for any coherent purpose. It includes trivial endpoints (true_endpoint, null, hello_world) and numerous duplicates, far exceeding a well-scoped utility set.

Completeness2/5

While the server covers many domains (math, strings, dates, colors, etc.), the presence of duplicate and trivial tools indicates a lack of thoughtful curation. There are gaps in basic operations (e.g., no dedicated file or network tools), and many tools are redundant.

prettify_json

Input Schema

Output Schema

Schema Changelog

TDQS

Glama MCP Gateway

TDQS

Resources