io.github.j-river/subtitlepop

SubtitlePop MCP — SRT & WebVTT Tools

Is the SubtitlePop MCP server down? No. It answered initialize and tools/list in the probe of 2026-11-14.

SubtitlePop MCP: check subtitle timing, convert SRT/WebVTT, shift captions and extract transcripts.

alive probed 2026-11-14

4tools

1.7ktokens in Claude Opus 5.5

0.9 %of Claude's 200k window

0.7×the median server

231 msto initialize

11 msto list tools

Run it: npx -y subtitlepop-mcp@0.1.0 (stdio, probed in a container with the network off)
Host: npmjs.com
Reports itself as: subtitlepop-mcp 0.1.0
Capabilities: tools
Instructions: 389 characters
Of a 1M window: 0.2 % of a 1M context window
Count: 1.7k tokens in Claude Opus 5.5, exact, measured 2026-11-14. With the Claude Code prefix mcp__…__ on each tool name: 1.7k. The o200k_base estimate is 925. Counted again when the tool definitions change. Method.
Repository: https://github.com/j-river/subtitlepop-mcp
Website: https://subtitlepop.com/
Registry: active, updated 2026-11-14 · registry entry

Most expensive tools

The Claude column scales the o200k estimate of each tool by this server's ratio of exact to estimate, 1.84×.

Tool	≈ Claude tokens	o200k estimate	Share of this server
inspect_subtitles	582	316	34 %
shift_subtitles	437	237	26 %
convert_subtitles	369	200	22 %
extract_transcript	317	172	19 %

Other registry entries on npmjs.com, the ones next to this name; all of them.

io.github.j-east/pixel-surgeon · alive
BGRemover MCP — Video Alpha Inspection io.github.j-river/bgremover · alive
EditableImage MCP — Editable Draw.io Diagrams io.github.j-river/editableimage · alive
Mermaid Online MCP — Share Links & Source io.github.j-river/mermaidonline · alive
IFC Viewer Online io.github.j03rul4nd/ifc-viewer-mcp · alive
Code Assistant io.github.j0hanz/code-assistant · alive
Code Lens io.github.j0hanz/code-lens · alive
Code Review Analyst io.github.j0hanz/code-review-analyst · not found

Servers that mention webvtt.

Caption File Check com.powmcp/caption-file-check · alive
YouTube Transcripts io.github.projectworks007/youtube-transcripts · needs auth
Subtitle Toolkit top.toolboxes/subtitle-toolkit · alive
Caption Checker io.github.markksantos/caption-checker · alive
io.github.mrfentmen/webvtt-mcp · alive
Speech to Text — File Transcripts, Speaker Labels & Subtitles io.github.kriton-dev/audio-to-transcript · not probed
Mark Studios Video Toolkit com.markstudios/video-toolkit · alive

The result of the latest probe, the tool count and the token cost. The feed has an entry for every probe that changed them.

Stops answering, comes back, tool set or cost changes. One confirmation mail first, a stop link in every mail.