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delete_caption

Delete a caption track from a YouTube video by specifying its track ID. Retrieve the ID using list_captions tool.

Instructions

Delete a caption track by ID. Use list_captions to find the track ID first.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
caption_idYesCaption track ID to delete.

Implementation Reference

  • The tool handler function for 'delete_caption'. It calls client.deleteCaption(args.caption_id) and returns a success message.
    server.tool(
      "delete_caption",
      "Delete a caption track by ID. Use list_captions to find the track ID first.",
      deleteCaptionSchema,
      async (args) => {
        await client.deleteCaption(args.caption_id);
        return {
          content: [
            {
              type: "text" as const,
              text: `Deleted caption track ${args.caption_id}.`,
            },
          ],
        };
      },
    );
  • The Zod schema for delete_caption input: requires a caption_id string.
    const deleteCaptionSchema = {
      caption_id: z.string().describe("Caption track ID to delete."),
    };
  • src/server.ts:51-51 (registration)
    Registration of the caption tools (including delete_caption) onto the MCP server.
    registerCaptionTools(s, youtube);
  • YouTube client helper method that performs the DELETE API call to remove a caption track by ID.
    deleteCaption(captionId: string): Promise<void> {
      const url = new URL(`${DATA_API}/captions`);
      url.searchParams.set("id", captionId);
      return this.request<void>(url.toString(), { method: "DELETE" });
    }
Behavior3/5

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

No annotations provided; description indicates destructive operation but lacks details on permissions, consequences, or side effects.

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?

Two sentences with no fluff, efficiently conveying the action and prerequisite.

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 tool with one parameter and no output schema, the description is adequate; it tells how to get the ID, but could mention any required permissions or effects.

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% with schema description 'Caption track ID to delete.', and description adds no extra meaning beyond that.

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?

Clearly states verb 'Delete' and resource 'caption track', and distinguishes from siblings by mentioning prerequisite list_captions.

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?

Explicitly instructs to use list_captions first to find the track ID, providing clear context but not mentioning when not to use or alternatives.

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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