@ffmpeg-micro/mcp-server

Get Transcribe Download URL

get_transcribe_download

Retrieve a temporary signed URL for a completed transcribe job's SRT file to burn captions into a video during a transcode.

Instructions

Generate a short-lived (10 minute) signed HTTPS URL for a completed transcribe job's SRT file. The job must be in completed status. The returned URL can be dropped directly into a transcode's subtitles='<url>' filter to burn captions into a video.

Tool call template

Replace each placeholder with a value matching the input schema. Only required parameters are included; add optional parameters as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {
      "id": "<id>"
    },
    "name": "get_transcribe_download"
  }
}

Input Schema

Name	Required	Description	Default
`id`	Yes	Completed transcribe job UUID

Schema Changelog

Changes observed during successful MCP inspections.

First observedv0.3.1Jul 28, 2026

TDQS

A4/5.0

Behavior3/5

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

No annotations exist, so the description carries full burden. It discloses the URL's short-lived duration (10 minutes) and file type (SRT). However, it does not mention rate limits, idempotency, or error behavior if the job is not completed, which are relevant for a generation endpoint.

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 efficient sentences with no fluff. The first states the primary action and duration, the second sets precondition and a usage example. Every sentence earns its place.

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?

Given the tool's simplicity (1 parameter, no output schema, no annotations), the description is complete enough. It covers purpose, precondition, and a practical integration tip. It lacks only minor behavioral details like error cases.

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 context that the 'id' parameter corresponds to a completed transcribe job. The schema already describes the parameter as 'Completed transcribe job UUID', so the description provides marginal added value.

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 explicitly states the tool 'Generate a short-lived signed HTTPS URL' for a completed transcribe job's SRT file, clearly distinguishing it from sibling tools like get_transcribe (which likely returns job metadata) and get_download_url (might be for other file types).

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?

The description specifies the precondition that the job must be in 'completed' status, and provides a practical use case in a transcode filter. It does not explicitly state when not to use the tool or list alternatives, but the context is sufficiently clear for an agent to decide.

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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