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Add subtitles to a video

add_subtitles

Burn subtitles into any video and export a matching .srt without cutting or re-rendering; auto-time per sentence or word, or pass custom cues for exact lines.

Instructions

Burn subtitles into ANY video and get the .srt too; nothing is cut or re-rendered. Set textStyle only when the user describes a look (default: white sentence case, thin outline, bottom). Timed per sentence, or auto:'words' for phrases on their spoken words. Or pass cues to burn your own lines exactly, untranscribed (reel-style phrases, stage directions). burn:false returns only the .srt. Takes a video file or URL, a YouTube/Vimeo-style page, or a TikTok / Reel / X post link. No speech is refused and refunded. Runs in the background and lands in the Library.

Input Schema

Name	Required	Description
`auto`	No
`burn`	No	false = only the .srt
`cues`	No	your own lines in seconds, no overlap, max 90 chars, no emoji
`video`	Yes	the video to subtitle
`textStyle`	No	the look: words, a preset or fields; omit for the default
`wordsPerCue`	No

Schema Changelog

Changes observed during successful MCP inspections.

Changed1 schema field changedv0.1.454Oct 27, 2026

changedInput schema / properties / textStyle / anyOf

Previous value: -[
-  {
-    "type": "string"
-  },
-  {
-    "properties": {
-      "background": {
-        "description": "none|pill|a colour",
-        "type": "string"
-      },
-      "cardColor": {
-        "type": "string"
-      },
-      "color": {
-        "description": "any CSS colour",
-        "type": "string"
-      },
-      "describe": {
-        "description": "the look in words",
-        "type": "string"
-      },
-      "font": {
-        "description": "sans|serif|elegant|condensed|hand or any Google Fonts family",
-        "type": "string"
-      },
-      "italic": {
-        "type": "boolean"
-      },
-      "outline": {
-        "type": "boolean"
-      },
-      "outlineColor": {
-        "type": "string"
-      },
-      "position": {
-        "anyOf": [
-          {
-            "type": "string"
-          },
-          {
-            "type": "number"
-          }
-        ],
-        "description": "top|center|lower|bottom or 0.05-0.95 from the top"
-      },
-      "preset": {
-        "type": "string"
-      },
-      "shadow": {
-        "type": "boolean"
-      },
-      "size": {
-        "anyOf": [
-          {
-            "type": "string"
-          },
-          {
-            "type": "number"
-          }
-        ],
-        "description": "s|m|l|xl, '120px', or a 0.015-0.15 frame fraction"
-      },
-      "subFont": {
-        "type": "string"
-      },
-      "subItalic": {
-        "type": "boolean"
-      },
-      "textCase": {
-        "enum": [
-          "as-is",
-          "upper",
-          "lower",
-          "title"
-        ],
-        "type": "string"
-      },
-      "tilt": {
-        "description": "degrees, ±45",
-        "type": "number"
-      },
-      "weight": {
-        "type": "number"
-      }
-    },
-    "type": "object"
-  }
-]New value: +[
+  {
+    "type": "string"
+  },
+  {
+    "properties": {
+      "background": {
+        "description": "none|pill|a colour",
+        "type": "string"
+      },
+      "cardColor": {
+        "type": "string"
+      },
+      "color": {
+        "description": "any CSS colour",
+        "type": "string"
+      },
+      "describe": {
+        "description": "the look in words",
+        "type": "string"
+      },
+      "font": {
+        "description": "sans|serif|elegant|condensed|hand or any Google Fonts family",
+        "type": "string"
+      },
+      "italic": {
+        "type": "boolean"
+      },
+      "outline": {
+        "type": "boolean"
+      },
+      "outlineColor": {
+        "type": "string"
+      },
+      "position": {
+        "description": "top|center|lower|bottom or 0.05-0.95 from the top",
+        "type": [
+          "string",
+          "number"
+        ]
+      },
+      "preset": {
+        "type": "string"
+      },
+      "shadow": {
+        "type": "boolean"
+      },
+      "size": {
+        "description": "s|m|l|xl, '120px', or a 0.015-0.15 frame fraction",
+        "type": [
+          "string",
+          "number"
+        ]
+      },
+      "subFont": {
+        "type": "string"
+      },
+      "subItalic": {
+        "type": "boolean"
+      },
+      "textCase": {
+        "enum": [
+          "as-is",
+          "upper",
+          "lower",
+          "title"
+        ],
+        "type": "string"
+      },
+      "tilt": {
+        "description": "degrees, ±45",
+        "type": "number"
+      },
+      "weight": {
+        "type": "number"
+      }
+    },
+    "type": "object"
+  }
+]

Changed5 schema fields changedv0.1.285Sep 24, 2026

addedInput schema / properties / auto

Added value: +{
+  "enum": [
+    "sentences",
+    "words"
+  ],
+  "type": "string"
+}

addedInput schema / properties / cues

Added value: +{
+  "description": "your own lines in seconds, no overlap, max 90 chars, no emoji",
+  "items": {
+    "properties": {
+      "end": {
+        "type": "number"
+      },
+      "start": {
+        "type": "number"
+      },
+      "text": {
+        "type": "string"
+      }
+    },
+    "required": [
+      "text",
+      "start",
+      "end"
+    ],
+    "type": "object"
+  },
+  "maxItems": 400,
+  "type": "array"
+}

changedInput schema / properties / textStyle / anyOf

Previous value: -[
-  {
-    "enum": [
-      "pill",
-      "editorial",
-      "bold",
-      "minimal",
-      "handwritten",
-      "boxed"
-    ],
-    "type": "string"
-  },
-  {
-    "properties": {
-      "background": {
-        "description": "none | pill | #hex box",
-        "type": "string"
-      },
-      "color": {
-        "description": "#hex",
-        "type": "string"
-      },
-      "font": {
-        "enum": [
-          "sans",
-          "serif",
-          "elegant",
-          "condensed",
-          "hand"
-        ],
-        "type": "string"
-      },
-      "italic": {
-        "type": "boolean"
-      },
-      "outline": {
-        "type": "boolean"
-      },
-      "position": {
-        "enum": [
-          "top",
-          "center",
-          "lower",
-          "bottom"
-        ],
-        "type": "string"
-      },
-      "preset": {
-        "enum": [
-          "pill",
-          "editorial",
-          "bold",
-          "minimal",
-          "handwritten",
-          "boxed"
-        ],
-        "type": "string"
-      },
-      "shadow": {
-        "type": "boolean"
-      },
-      "size": {
-        "anyOf": [
-          {
-            "enum": [
-              "s",
-              "m",
-              "l",
-              "xl"
-            ],
-            "type": "string"
-          },
-          {
-            "type": "number"
-          }
-        ]
-      },
-      "textCase": {
-        "enum": [
-          "as-is",
-          "upper",
-          "lower",
-          "title"
-        ],
-        "type": "string"
-      },
-      "tilt": {
-        "description": "degrees, ±12",
-        "type": "number"
-      },
-      "weight": {
-        "type": "number"
-      }
-    },
-    "type": "object"
-  }
-]New value: +[
+  {
+    "type": "string"
+  },
+  {
+    "properties": {
+      "background": {
+        "description": "none|pill|a colour",
+        "type": "string"
+      },
+      "cardColor": {
+        "type": "string"
+      },
+      "color": {
+        "description": "any CSS colour",
+        "type": "string"
+      },
+      "describe": {
+        "description": "the look in words",
+        "type": "string"
+      },
+      "font": {
+        "description": "sans|serif|elegant|condensed|hand or any Google Fonts family",
+        "type": "string"
+      },
+      "italic": {
+        "type": "boolean"
+      },
+      "outline": {
+        "type": "boolean"
+      },
+      "outlineColor": {
+        "type": "string"
+      },
+      "position": {
+        "anyOf": [
+          {
+            "type": "string"
+          },
+          {
+            "type": "number"
+          }
+        ],
+        "description": "top|center|lower|bottom or 0.05-0.95 from the top"
+      },
+      "preset": {
+        "type": "string"
+      },
+      "shadow": {
+        "type": "boolean"
+      },
+      "size": {
+        "anyOf": [
+          {
+            "type": "string"
+          },
+          {
+            "type": "number"
+          }
+        ],
+        "description": "s|m|l|xl, '120px', or a 0.015-0.15 frame fraction"
+      },
+      "subFont": {
+        "type": "string"
+      },
+      "subItalic": {
+        "type": "boolean"
+      },
+      "textCase": {
+        "enum": [
+          "as-is",
+          "upper",
+          "lower",
+          "title"
+        ],
+        "type": "string"
+      },
+      "tilt": {
+        "description": "degrees, ±45",
+        "type": "number"
+      },
+      "weight": {
+        "type": "number"
+      }
+    },
+    "type": "object"
+  }
+]

changedInput schema / properties / textStyle / description

Previous value: -"the look: a preset or overrides; omit for the default"New value: +"the look: words, a preset or fields; omit for the default"

addedInput schema / properties / wordsPerCue
```
Added value: +{
+  "type": "number"
+}
```

Addedv0.1.227Sep 12, 2026

TDQS

A4.6/5.0

Behavior5/5

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

Beyond the annotations, the description discloses several important behaviors: nothing is cut or re-rendered, no speech is refused and refunded, burn:false returns only the .srt, and the job runs in the background and lands in the Library. These details substantially reduce ambiguity for a write operation.

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 dense but front-loaded and every sentence carries useful information. Despite covering multiple modes, styling defaults, input types, and asynchronous behavior, it avoids repetition and stays readable.

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 complex tool with six parameters and no output schema, the description covers the main behavioral modes, input sources, .srt output, refund behavior, and background delivery. The omission of wordsPerCue and job-tracking details keeps it from being fully complete.

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?

The description adds meaning beyond the schema for video, textStyle, auto, cues, and burn, including defaults, input source types, and output behavior. However, wordsPerCue is not explained in either the schema or the description, leaving one parameter underspecified.

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 states a specific verb and resource: burn subtitles into a video and return the .srt. It also distinguishes the operation from broader video editing by saying nothing is cut or re-rendered, making it clearly a subtitle-specific tool among the many video siblings.

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

Usage Guidelines4/5

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

It gives clear conditional guidance for textStyle, auto modes, cues, and burn:false, so the agent knows how to choose among the tool's modes. It does not explicitly compare against sibling tools such as edit_video or dub_video, so it falls short of explicit alternatives guidance.

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

Deploy Server

Add subtitles to a video

Instructions

Input Schema

Schema Changelog

TDQS

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