loom-transcript（织布机成绩单）

Loom Transcript Fetcher

Fetch the transcript from a Loom video using Loom's GraphQL API.

Instructions

Given the Loom URL: $ARGUMENTS

1. Extract the Video ID

Parse the Loom URL to extract the 32-character hex video ID. Supported URL formats:

• https://www.loom.com/share/<video-id>
• https://www.loom.com/embed/<video-id>
• https://www.loom.com/share/<video-id>?sid=<session-id>

The video ID is the 32-character hex string after /share/ or /embed/.

2. Fetch Video Metadata

Use the WebFetch tool to POST to https://www.loom.com/graphql to get the video title and details.

Use this curl command via Bash:

curl -s 'https://www.loom.com/graphql' \
  -H 'Content-Type: application/json' \
  -H 'Accept: application/json' \
  -H 'x-loom-request-source: loom_web_45a5bd4' \
  -H 'apollographql-client-name: web' \
  -H 'apollographql-client-version: 45a5bd4' \
  -d '{
    "operationName": "GetVideoSSR",
    "variables": {"id": "<VIDEO_ID>", "password": null},
    "query": "query GetVideoSSR($id: ID!, $password: String) { getVideo(id: $id, password: $password) { ... on RegularUserVideo { id name description createdAt owner { display_name } } } }"
  }'

3. Fetch the Transcript URLs

Use curl via Bash to call the GraphQL API:

curl -s 'https://www.loom.com/graphql' \
  -H 'Content-Type: application/json' \
  -H 'Accept: application/json' \
  -H 'x-loom-request-source: loom_web_45a5bd4' \
  -H 'apollographql-client-name: web' \
  -H 'apollographql-client-version: 45a5bd4' \
  -d '{
    "operationName": "FetchVideoTranscript",
    "variables": {"videoId": "<VIDEO_ID>", "password": null},
    "query": "query FetchVideoTranscript($videoId: ID!, $password: String) { fetchVideoTranscript(videoId: $videoId, password: $password) { ... on VideoTranscriptDetails { id video_id source_url captions_source_url } ... on GenericError { message } } }"
  }'

Replace <VIDEO_ID> with the actual video ID extracted in step 1.

The response contains:

• source_url — JSON transcript URL
• captions_source_url — VTT (WebVTT) captions URL

4. Download and Parse the Transcript

Fetch both URLs returned from step 3 (if available):

1. VTT captions (captions_source_url): Download with curl -sL "<url>". This is a WebVTT file with timestamps and text.
2. JSON transcript (source_url): Download with curl -sL "<url>". This is a JSON file with transcript segments.

Prefer the VTT captions as the primary source since they include proper timestamps. Fall back to the JSON transcript if VTT is unavailable.

5. Present the Transcript

Format and present the full transcript to the user:

Video: [Title from metadata] Author: [Owner name] Date: [Created date]

0:00 - First transcript segment text...

0:14 - Second transcript segment text...

(continue for all segments)

Error Handling

• If the GraphQL response contains a GenericError, report the error message to the user.
• If both source_url and captions_source_url are null/missing, tell the user that no transcript is available for this video.
• If the video URL is invalid or the ID cannot be extracted, ask the user for a valid Loom URL.

Notes

• No authentication or cookies are required — Loom's transcript API is publicly accessible.
• Only English transcripts are available through this API.
• Transcripts are auto-generated and may contain minor errors.