io.github.SpaceSheepBoy/justcaptions

Measured conclusion: Alive, not deep-tested. L2 outcome: not_attempted.

Audio transcription, caption correction, translation and 16 video caption styles.

Add to your agent

Copy this into your MCP client config:

{
  "mcpServers": {
    "justcaptions": {
      "url": "https://api.justcaptions.com/mcp",
      "transport": "streamable-http"
    }
  }
}

Measured tools (9)

• list_styles read-only

  List 16 local rendering presets, aliases, style overrides and platform safe areas. This remote server returns the catalog; render via the local MCP.

  Hints: read-only yes · destructive no · idempotent yes · open-world not declared

• list_fonts read-only

  List named font IDs, licenses and script coverage. Pass font_id in local rendering overrides; no cloud video rendering.

  Hints: read-only yes · destructive no · idempotent yes · open-world not declared

• get_pricing read-only

  Current API prices and monthly free allowances, no key needed.

  Hints: read-only yes · destructive no · idempotent yes · open-world not declared

• get_usage read-only

  Current usage, estimated bill and monthly spend cap for your configured API key.

  Hints: read-only yes · destructive no · idempotent yes · open-world not declared

• estimate_cost read-only

  Estimate additional cloud charges and available allowance before a batch. Includes active budget holds; does not reserve credit.

  Parameters:

  • text_chars — integer
  • audio_seconds — number

  Hints: read-only yes · destructive no · idempotent yes · open-world not declared

• transcribe_audio

  Transcribe extracted audio into segments and word timestamps. Max 12 MB decoded. Never send video. Charged by audio duration past the free allowance.

  Parameters:

  • audio_base64 (required) — string
  • mime_type (required) — string
  • glossary — array
  • language — string
  • request_id — string — Unique request ID; reuse only when retrying identical work to avoid repeating paid calls.

  Hints: read-only no · destructive no · idempotent no · open-world yes

• correct_captions

  Correct caption text, preserving caption count and order. Does not realign word timing. Billed by input characters.

  Parameters:

  • captions (required) — array
  • glossary — array
  • language — string
  • request_id — string — Unique request ID; reuse only when retrying identical work to avoid repeating paid calls.

  Hints: read-only no · destructive no · idempotent no · open-world yes

• translate_captions

  Translate caption lines, preserving count and order. Target-language word timing is estimated by the local renderer. Billed by input characters.

  Parameters:

  • captions (required) — array
  • target_language (required) — string
  • glossary — array
  • request_id — string — Unique request ID; reuse only when retrying identical work to avoid repeating paid calls.

  Hints: read-only no · destructive no · idempotent no · open-world yes

• pick_emojis

  Pick one emoji for each caption. Billed by input characters.

  Parameters:

  • captions (required) — array
  • language — string
  • request_id — string — Unique request ID; reuse only when retrying identical work to avoid repeating paid calls.

  Hints: read-only no · destructive no · idempotent no · open-world yes

Publisher website Repository

Measured by MCPYP probing. Untested fields are omitted, never estimated. Listing is always free; MCPYP never proxies calls or stores user tokens.