Caption File Check MCP Server

by powmcp Your server? Claim it

answering

Caption File Check is answering right now. Last checked 9 min ago. It exposes 2 tools.

Parse WebVTT, SRT, or TTML for conformance, timing, overlaps, line length, and reading speed.

Uptime history 9 days of history · worst day 99%

9 days agonow

100.0%

Uptime 24h

91 of 91 checks

Tools

read from the server

371 ms

Response time

average over 24h

open, no key

Access

streamable-http

Caption File Check missed one check this week

Everything else answered, so this is steady rather than shaky. We check every 15 minutes, which is how a one-off gets told apart from the start of a pattern, and how you hear about the next one within the hour instead of from your users.

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 9 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add caption-file-check --transport http https://powmcp.com/caption-file-check/mcp

~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "caption-file-check": {
      "url": "https://powmcp.com/caption-file-check/mcp"
    }
  }
}

~/.codex/config.toml

[mcp_servers.caption-file-check]
url = "https://powmcp.com/caption-file-check/mcp"

.cursor/mcp.json

{
  "mcpServers": {
    "caption-file-check": {
      "url": "https://powmcp.com/caption-file-check/mcp"
    }
  }
}

.vscode/mcp.json

{
  "mcpServers": {
    "caption-file-check": {
      "url": "https://powmcp.com/caption-file-check/mcp"
    }
  }
}

Available tools 2

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

caption

caption_check

Preflight one caption or subtitle file before delivery. Attach a WebVTT (.vtt), SRT (.srt), or TTML/IMSC (.ttml/.xml) caption file in chat or give a publicly fetchable URL and it downloads the artifact under an SSRF-guarded, 2 MB-capped fetch, detects the format by content and the byte encoding and BOM, then parses it with the real spec engine (the WebVTT spec parser, a dedicated SRT parser, or the imscJS TTML/IMSC profile engine) and returns deterministic evidence: pass/fail, cue count, structural spec and IMSC profile-conformance errors, overlapping / negative / out-of-order / empty cues, per-line length, and per-cue and summary reading speed (CPS) against a named platform profile (netflix-adult-20, netflix-children-17, youtube, ebu-tt). It reports only source-file conformance, timing, encoding, and reading-speed facts against a dated profile. It does not judge translation quality, transcription accuracy, or synchronization against the video. An arbitrary XML or text file that is not a caption track returns an explicit unsupported-format error. Fetching and parsing a full-length track can take up to 60 seconds.

caption_compare

Compare exactly two caption or subtitle files under identical bounded checks: an original versus its translated track, before versus after a timing fix, or a format migration. Attach two WebVTT, SRT, or TTML/IMSC caption files in chat or give two publicly fetchable URLs and it runs the same SSRF-guarded, 2 MB-capped preflight as caption_check on each, then aligns them by cue index and reports side-by-side pass status, detected-format and encoding differences, the cue-count delta, timing drift and overlap differences, reading-speed (CPS) regressions, structural-error deltas, and a winner only when the measured checks separate the two. Use caption_check for a single file. It reports only source-file conformance, timing, encoding, and reading-speed facts against a dated profile: never translation quality, transcription accuracy, or sync against the video. Fetching and parsing two live files can take up to 60 seconds.

Endpoints

URL	Transport	State	Latency	Checked
https://powmcp.com/caption-file-check/mcp	streamable-http	answering	453 ms	9 min ago

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Caption File Check — questions

Answers built from our own checks of this server.

What can Caption File Check do?

It exposes 2 tools, read directly from the server on our last check. Among them: caption_check, caption_compare. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →

Is Caption File Check working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 91 of 91 checks got a reply (100.0%), average response time 371 ms. The bar chart above shows every period we have measured.

How do I connect Caption File Check?

Copy the ready config from this page — we generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each with the file path that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.

Does Caption File Check need an API key?

No. Caption File Check completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 2 of them are readable on this page. This is what we observed, not what the docs claim.

How fast is Caption File Check?

It answers our handshake in 371 ms on average, which is faster than 42% of all working MCP servers we measure. The comparison comes from our own checks across the whole registry, every 15 minutes.