TinyFn

subtract_time

Subtract time from a date.

Input Schema

TableJSON Schema

Name	Required	Description
`date`	Yes	Start date (ISO format)
`days`	No	Days to subtract
`hours`	No	Hours to subtract
`weeks`	No	Weeks to subtract
`minutes`	No	Minutes to subtract
`seconds`	No	Seconds to subtract

Output Schema

TableJSON Schema

Name	Required	Description	Default
`code`	No
`error`	No
`result`	No
`original`	No
`subtracted`	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 / SubtractTimeResponse

Added value: +{
+  "properties": {
+    "code": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Code"
+    },
+    "error": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Error"
+    },
+    "original": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Original"
+    },
+    "result": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Result"
+    },
+    "subtracted": {
+      "anyOf": [
+        {
+          "$ref": "#/$defs/TimeDelta"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    }
+  },
+  "title": "SubtractTimeResponse",
+  "type": "object"
+}

removedOutput schema / $defs / app__routers__datetime_utils__SubtractTimeResponse

Removed value: -{
-  "properties": {
-    "code": {
-      "anyOf": [
-        {
-          "type": "string"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Code"
-    },
-    "error": {
-      "anyOf": [
-        {
-          "type": "string"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Error"
-    },
-    "original": {
-      "anyOf": [
-        {
-          "type": "string"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Original"
-    },
-    "result": {
-      "anyOf": [
-        {
-          "type": "string"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Result"
-    },
-    "subtracted": {
-      "anyOf": [
-        {
-          "$ref": "#/$defs/TimeDelta"
-        },
-        {
-          "type": "null"
-        }
-      ]
-    }
-  },
-  "title": "SubtractTimeResponse",
-  "type": "object"
-}

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

Previous value: -"app__routers__datetime_utils__SubtractTimeResponse"New value: +"SubtractTimeResponse"

Changed3 schema fields changedAug 29, 2026

removedOutput schema / $defs / SubtractTimeResponse

Removed value: -{
-  "properties": {
-    "code": {
-      "anyOf": [
-        {
-          "type": "string"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Code"
-    },
-    "error": {
-      "anyOf": [
-        {
-          "type": "string"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Error"
-    },
-    "original": {
-      "anyOf": [
-        {
-          "type": "string"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Original"
-    },
-    "result": {
-      "anyOf": [
-        {
-          "type": "string"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Result"
-    },
-    "subtracted": {
-      "anyOf": [
-        {
-          "$ref": "#/$defs/TimeDelta"
-        },
-        {
-          "type": "null"
-        }
-      ]
-    }
-  },
-  "title": "SubtractTimeResponse",
-  "type": "object"
-}

addedOutput schema / $defs / app__routers__datetime_utils__SubtractTimeResponse

Added value: +{
+  "properties": {
+    "code": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Code"
+    },
+    "error": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Error"
+    },
+    "original": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Original"
+    },
+    "result": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Result"
+    },
+    "subtracted": {
+      "anyOf": [
+        {
+          "$ref": "#/$defs/TimeDelta"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    }
+  },
+  "title": "SubtractTimeResponse",
+  "type": "object"
+}

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

Previous value: -"SubtractTimeResponse"New value: +"app__routers__datetime_utils__SubtractTimeResponse"

Changed3 schema fields changedJul 27, 2026

addedOutput schema / $defs / SubtractTimeResponse

Added value: +{
+  "properties": {
+    "code": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Code"
+    },
+    "error": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Error"
+    },
+    "original": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Original"
+    },
+    "result": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Result"
+    },
+    "subtracted": {
+      "anyOf": [
+        {
+          "$ref": "#/$defs/TimeDelta"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    }
+  },
+  "title": "SubtractTimeResponse",
+  "type": "object"
+}

removedOutput schema / $defs / app__routers__datetime_utils__SubtractTimeResponse

Removed value: -{
-  "properties": {
-    "code": {
-      "anyOf": [
-        {
-          "type": "string"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Code"
-    },
-    "error": {
-      "anyOf": [
-        {
-          "type": "string"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Error"
-    },
-    "original": {
-      "anyOf": [
-        {
-          "type": "string"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Original"
-    },
-    "result": {
-      "anyOf": [
-        {
-          "type": "string"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Result"
-    },
-    "subtracted": {
-      "anyOf": [
-        {
-          "$ref": "#/$defs/TimeDelta"
-        },
-        {
-          "type": "null"
-        }
-      ]
-    }
-  },
-  "title": "SubtractTimeResponse",
-  "type": "object"
-}

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

Previous value: -"app__routers__datetime_utils__SubtractTimeResponse"New value: +"SubtractTimeResponse"

Changed3 schema fields changedJul 17, 2026

removedOutput schema / $defs / SubtractTimeResponse

Removed value: -{
-  "properties": {
-    "code": {
-      "anyOf": [
-        {
-          "type": "string"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Code"
-    },
-    "error": {
-      "anyOf": [
-        {
-          "type": "string"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Error"
-    },
-    "original": {
-      "anyOf": [
-        {
-          "type": "string"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Original"
-    },
-    "result": {
-      "anyOf": [
-        {
-          "type": "string"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Result"
-    },
-    "subtracted": {
-      "anyOf": [
-        {
-          "$ref": "#/$defs/TimeDelta"
-        },
-        {
-          "type": "null"
-        }
-      ]
-    }
-  },
-  "title": "SubtractTimeResponse",
-  "type": "object"
-}

addedOutput schema / $defs / app__routers__datetime_utils__SubtractTimeResponse

Added value: +{
+  "properties": {
+    "code": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Code"
+    },
+    "error": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Error"
+    },
+    "original": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Original"
+    },
+    "result": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Result"
+    },
+    "subtracted": {
+      "anyOf": [
+        {
+          "$ref": "#/$defs/TimeDelta"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    }
+  },
+  "title": "SubtractTimeResponse",
+  "type": "object"
+}

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

Previous value: -"SubtractTimeResponse"New value: +"app__routers__datetime_utils__SubtractTimeResponse"

Changed3 schema fields changedJul 13, 2026

addedOutput schema / $defs / SubtractTimeResponse

Added value: +{
+  "properties": {
+    "code": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Code"
+    },
+    "error": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Error"
+    },
+    "original": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Original"
+    },
+    "result": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Result"
+    },
+    "subtracted": {
+      "anyOf": [
+        {
+          "$ref": "#/$defs/TimeDelta"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    }
+  },
+  "title": "SubtractTimeResponse",
+  "type": "object"
+}

removedOutput schema / $defs / app__routers__datetime_utils__SubtractTimeResponse

Removed value: -{
-  "properties": {
-    "code": {
-      "anyOf": [
-        {
-          "type": "string"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Code"
-    },
-    "error": {
-      "anyOf": [
-        {
-          "type": "string"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Error"
-    },
-    "original": {
-      "anyOf": [
-        {
-          "type": "string"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Original"
-    },
-    "result": {
-      "anyOf": [
-        {
-          "type": "string"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Result"
-    },
-    "subtracted": {
-      "anyOf": [
-        {
-          "$ref": "#/$defs/TimeDelta"
-        },
-        {
-          "type": "null"
-        }
-      ]
-    }
-  },
-  "title": "SubtractTimeResponse",
-  "type": "object"
-}

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

Previous value: -"app__routers__datetime_utils__SubtractTimeResponse"New value: +"SubtractTimeResponse"

Changed3 schema fields changedJul 8, 2026

removedOutput schema / $defs / SubtractTimeResponse

Removed value: -{
-  "properties": {
-    "code": {
-      "anyOf": [
-        {
-          "type": "string"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Code"
-    },
-    "error": {
-      "anyOf": [
-        {
-          "type": "string"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Error"
-    },
-    "original": {
-      "anyOf": [
-        {
-          "type": "string"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Original"
-    },
-    "result": {
-      "anyOf": [
-        {
-          "type": "string"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Result"
-    },
-    "subtracted": {
-      "anyOf": [
-        {
-          "$ref": "#/$defs/TimeDelta"
-        },
-        {
-          "type": "null"
-        }
-      ]
-    }
-  },
-  "title": "SubtractTimeResponse",
-  "type": "object"
-}

addedOutput schema / $defs / app__routers__datetime_utils__SubtractTimeResponse

Added value: +{
+  "properties": {
+    "code": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Code"
+    },
+    "error": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Error"
+    },
+    "original": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Original"
+    },
+    "result": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Result"
+    },
+    "subtracted": {
+      "anyOf": [
+        {
+          "$ref": "#/$defs/TimeDelta"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    }
+  },
+  "title": "SubtractTimeResponse",
+  "type": "object"
+}

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

Previous value: -"SubtractTimeResponse"New value: +"app__routers__datetime_utils__SubtractTimeResponse"

First observedJun 27, 2026

TDQS

C2.8/5.0

Behavior2/5

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

With no annotations, the description carries the full burden of behavioral disclosure, but it only states the core operation. It discloses nothing about how the six parameters combine, edge-case behavior (e.g., month-end date arithmetic), or the nature of the result, leaving important semantics implicit.

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

Conciseness3/5

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

The description is a single efficient sentence with no redundant words and front-loads the operation. However, it is arguably under-specified for a tool with six parameters and a near-identical sibling.

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

Completeness2/5

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

The description is adequate only for the simplest reading; it lacks any hint of parameter combination, output, or sibling selection. Given the existence of subtract_time_2 and related time tools, an agent cannot confidently choose and call this tool based on the description alone.

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?

The schema already documents all six parameters with descriptions and defaults (100% coverage), so the description need not repeat them. The description adds no extra parameter context beyond confirming the operation.

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 uses a clear verb+object structure ('Subtract time from a date'), making the basic operation understandable. However, it does not differentiate from the near-identical sibling subtract_time_2, nor does it mention the units or return format.

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 given about when to prefer this tool over subtract_time_2, add_time, or date_diff. An agent is left to infer context from the name alone.

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

All TinyFn tools Inspect

Try in Browser

RayrunBuild, deploy, and operate MCP servers without becoming an infrastructure team.ray.runAd

Glama MCP Gateway

Add one secure layer between your agents and this server.

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.

subtract_time

Input Schema

Output Schema

Schema Changelog

TDQS

Glama MCP Gateway

TDQS

Resources