Subtitle Toolkit
REMOTE · SUBTITLE-MCP.TOOLBOXES.TOP · SCANNED SEP 28
Convert, clean, retime and validate SRT, WebVTT, ASS/SSA, SBV and TTML subtitles. 8 tools.
Available components
How this component scores in each security and reliability category. Every signal is checked automatically against the live server, and we only credit what we can confirm. How we score → Why this is hard to score →
Endpoint Security57
- The endpoint's TLS certificate is valid, in date, and uses a strong key. View diagnostics → Pass
- Authorisation not fully verified: no authorisation is required to call this server, and 8 tool(s) never declared a destructiveHint. The MCP spec treats an absent hint as destructive by default, so we cannot call this surface safe. See how to fix → View diagnostics → Unverified
- HTTPS is enforced; there's no plaintext access path. View diagnostics → Pass
- HSTS check failed: the Strict-Transport-Security header is absent. See how to fix → View diagnostics → Fail
- DNSSEC check failed: this domain isn't protected by DNSSEC. See how to fix → View diagnostics → Fail
Transport & Reachability100
- Verified streamable-http transport via a live MCP handshake. View diagnostics → Pass
Schema Quality & AI Usability81
- 100% of prompts and resources have a non-trivial description (not blank, and not just the item's name).Pass
- AI-judged instruction clarity (excellent).Pass
- Context-footprint check failed: tool/resource definitions use about 1451 tokens (~161/item across 9 items; 8 tools + 1 resources), over budget; trim descriptions and params. See how to fix → Fail
- Usage-examples check failed: none of the tools include examples. See how to fix → Fail
Stability & Change Management20
- Stability observed for 6 of 30 days with no destabilising changes; credit accrues until the full window elapses.Partial
Tool Coverage100
- 100% of tools have a non-trivial description (not blank, and not just the tool's name).Pass
- 100% of tool parameters carry a description.Pass
Tool Safety75
- No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.Pass
- 0 of 1 tool(s) whose name or description implies an irreversible operation declare an MCP destructiveHint annotation; "merge_subtitles" implies "merge" and declares no destructiveHint at all, which the MCP spec reads as destructive by default. See how to fix → Fail
- An AI judge read all 10 captured unit(s) of tool text and found none that tries to manipulate the model reading it.Pass
Capabilities60
- Spec-recency check failed: implements MCP spec 2025-06-18; the latest is 2026-07-28. See how to fix → Fail
How do I install the Subtitle Toolkit MCP server?
Subtitle Toolkit is a hosted endpoint at https://subtitle-mcp.toolboxes.top/mcp, so there is nothing to install locally. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.
remote · subtitle-mcp.toolboxes.top
claude mcp add --transport http top-toolboxes-subtitle-toolkit 'https://subtitle-mcp.toolboxes.top/mcp'
{
"mcpServers": {
"top-toolboxes-subtitle-toolkit": {
"url": "https://subtitle-mcp.toolboxes.top/mcp"
}
}
} {
"servers": {
"top-toolboxes-subtitle-toolkit": {
"type": "http",
"url": "https://subtitle-mcp.toolboxes.top/mcp"
}
}
} [mcp_servers.top-toolboxes-subtitle-toolkit] url = "https://subtitle-mcp.toolboxes.top/mcp"
{
"$schema": "https://opencode.ai/config.json",
"mcp": {
"top-toolboxes-subtitle-toolkit": {
"type": "remote",
"url": "https://subtitle-mcp.toolboxes.top/mcp",
"enabled": true
}
}
} openclaw mcp add top-toolboxes-subtitle-toolkit --url 'https://subtitle-mcp.toolboxes.top/mcp' --transport streamable-http
mcp_servers:
top-toolboxes-subtitle-toolkit:
url: "https://subtitle-mcp.toolboxes.top/mcp" {
"McpServers": {
"top-toolboxes-subtitle-toolkit": {
"Transport": "http",
"Url": "https://subtitle-mcp.toolboxes.top/mcp"
}
}
} assistant mcp add top-toolboxes-subtitle-toolkit -t streamable-http -u 'https://subtitle-mcp.toolboxes.top/mcp'
{
"mcpServers": {
"top-toolboxes-subtitle-toolkit": {
"type": "http",
"url": "https://subtitle-mcp.toolboxes.top/mcp"
}
}
} The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.
Every change we have recorded for this component, newest first. Security-relevant changes are always shown. ▲ marks a change for the better, ▼ a change for the worse; unmarked changes are neutral.
- 28 Sept 26 0
- We updated how we score, so this day's move reflects our rubric, not a change to the server See what changed → functional
- 27 Sept 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 13 to 17. That category is still filling its 30-day observation window: 4 days of observed history at the previous scan, 5 at this one. The score rises as the window fills, whether or not the server changes.
- 25 Sept 26 +1
- We updated how we score, so this day's move reflects our rubric, not a change to the server See what changed → functional
- 23 Sept 26 +1
- Stability: unverified → 0.03 ▲ functional
- 22 Sept 26 62
First indexed and scored.
Diagnostic detail from the automated scan of this channel: what the scanner observed at each step, so you can see exactly where a check passed or failed. It is informational only and never changes the trust score.
Captured 28 Sept 2026 · Probed https://subtitle-mcp.toolboxes.top/mcp
TLS valid
Negotiated TLS 1.3 with TLS_AES_128_GCM_SHA256 .
| Subject | Issuer | Valid from | Valid until | Key | Signature | Serial |
|---|---|---|---|---|---|---|
| CN=toolboxes.top | CN=WE1,O=Google Trust Services,C=US | 22 Sept 2026 | 21 Dec 2026 | ECDSA 256 | ECDSA-SHA256 | 5a82afcf9fa276e00ea64afd51965f2c |
| SANs: toolboxes.top, subtitle-mcp.toolboxes.top, *.subtitle-mcp.toolboxes.top | ||||||
| CN=WE1,O=Google Trust Services,C=US (CA) | CN=GTS Root R4,O=Google Trust Services LLC,C=US | 13 Dec 2023 | 20 Feb 2029 | ECDSA 256 | ECDSA-SHA384 | 7ff31977972c224a76155d13b6d685e3 |
| CN=GTS Root R4,O=Google Trust Services LLC,C=US (CA) | CN=GlobalSign Root CA,OU=Root CA,O=GlobalSign nv-sa,C=BE | 15 Nov 2023 | 28 Jan 2028 | ECDSA 384 | SHA256-RSA | 7fe530bf331343bedd821610493d8a1b |
Background: What to check on a remote MCP endpoint →
DNSSEC insecure
Validation of subtitle-mcp.toolboxes.top. — Not signed
| Zone | DS | Keys | Algorithms | Outcome |
|---|---|---|---|---|
| . | trust_anchor | 20326, 38696 | 8, 8 | Verified |
| top. | present | 26780, 41508 | 8, 13 | Verified |
| toolboxes.top. | absent | Unsigned (proven) parent-signed NSEC/NSEC3 proves an unsigned delegation |
Authentication No authorisation required
The endpoint answered without asking for a token. Anyone who knows the URL can reach it.
| Result | No authorisation required |
|---|---|
| HTTP status | 200 |
Background: How OAuth 2.1 works in the 2026 MCP spec →
Transports 2 probes
| Transport | URL | Outcome | Status | Location |
|---|---|---|---|---|
| streamable-http | https://subtitle-mcp.toolboxes.top/mcp | Verified | 200 | |
| http (plaintext) | http://subtitle-mcp.toolboxes.top/mcp | HTTPS enforced | 301 | https://subtitle-mcp.toolboxes.top/mcp |
The tools this component advertises to a client, with an estimated token cost for each. Expand a tool to see its parameters and schema. The per-tool counts are indicative and are not scored directly; the schema's total context footprint is one signal in Schema Quality & AI Usability. A tool's description is untrusted text the model reads on every call, which is what makes this list a security surface and not just an inventory: how tool poisoning works →
check_subtitle_timing ~150
Audit subtitle readability and produce a report: reading speed (CPS), cue durations that are too short or too long, lines that are too wide, more than two lines, and overlapping cues. Returns a formatted report listing every flagged cue.
| Name | Type | Req | Description |
|---|---|---|---|
| content | string | yes | The full subtitle file text. |
| max_cps | number | – | Max characters per second. Default 20. |
| max_duration_seconds | number | – | Maximum cue duration in seconds. Default 7. |
| max_line_length | number | – | Max characters per line. Default 42. |
| min_duration_seconds | number | – | Minimum cue duration in seconds. Default 0.833 (Netflix 5/6s). |
No output schema declared.
No examples provided.
clean_subtitles ~194
Strip noise from auto-generated subtitles: HTML/WebVTT tags, ASS override codes, music and sound-effect cues, speaker labels, empty cues and duplicate lines. Returns the subtitle file in SRT or WebVTT.
| Name | Type | Req | Description |
|---|---|---|---|
| content | string | yes | The full subtitle file text. |
| drop_duplicates | boolean | – | Drop cues whose text was already seen. Default false. |
| drop_empty | boolean | – | Drop cues that become empty after cleaning. Default true. |
| remove_sound_cues | boolean | – | Strip [Music], [Applause], ♪ ... ♪ and similar. Default true. |
| remove_speaker_labels | boolean | – | Strip leading "SPEAKER:" prefixes. Default false — enable only if you want them gone. |
| remove_tags | boolean | – | Strip HTML/WebVTT tags and ASS override codes. Default true. |
| to | string | – | Output format. Default: same as the input. |
No output schema declared.
No examples provided.
convert_subtitle ~145
Convert subtitle text between formats. Reads SRT, WebVTT, ASS/SSA, YouTube SBV and TTML/DFXP; writes SRT, WebVTT, ASS, CSV or plain text. Format is auto-detected unless `from` is given.
| Name | Type | Req | Description |
|---|---|---|---|
| content | string | yes | The full subtitle file text. |
| dedupe | boolean | – | Only for to="text": collapse consecutive identical lines (rolling-caption transcripts repeat lines). Default false. |
| from | string | – | Source format (default "auto" = detect). |
| to | string | yes | Target format. `text` = plain transcript, one line per cue, no timecodes. |
No output schema declared.
No examples provided.
fix_subtitle_encoding ~143
Repair mojibake — text where UTF-8 bytes were decoded as a single-byte encoding (cp1252/Latin-1 or cp1251). Symptoms: "é", "’", "привет". Returns the repaired text and how many passes were applied.
| Name | Type | Req | Description |
|---|---|---|---|
| content | string | yes | The garbled subtitle text. |
| read_as | string | – | Which encoding the file was wrongly read as. Default "auto" (tries cp1252 then cp1251). |
| twice | boolean | – | Set true when the text was mis-decoded twice (nested mojibake). Default false. |
No output schema declared.
No examples provided.
merge_subtitles ~112
Append one subtitle track after another (CD1 + CD2, or a second language track). The second track is offset so it starts after the last cue of the first, plus an optional gap.
| Name | Type | Req | Description |
|---|---|---|---|
| append_content | string | yes | The subtitle file text to append. |
| content | string | yes | The first subtitle file text. |
| gap_seconds | number | – | Extra gap between the two tracks, in seconds. Default 0. |
| to | string | – | Output format. Default: same as the input. |
No output schema declared.
No examples provided.
retime_subtitles ~178
Fix subtitle timing. Use offset_seconds for a uniform shift (whole track early/late). Use ratio, or from_fps/to_fps, for progressive drift caused by a frame-rate mismatch. Pass exactly one of the three.
| Name | Type | Req | Description |
|---|---|---|---|
| content | string | yes | The full subtitle file text. |
| from_fps | number | – | The frame rate the subtitles were authored for (used with to_fps). |
| offset_seconds | number | – | Shift every cue by this many seconds. Negative = earlier. e.g. -2.5 |
| ratio | number | – | Scale all timings by this factor (new = old x ratio). e.g. 1.0427 for a 25→23.976 fps fix. |
| to_fps | number | – | The frame rate of the actual video (used with from_fps). |
No output schema declared.
No examples provided.
split_subtitles ~130
Split one subtitle track into two parts at a given timecode, keeping original timecodes. Use the `at` argument plus `part` to fetch either half.
| Name | Type | Req | Description |
|---|---|---|---|
| at | string | yes | Split point. Accepts "45:00", "1:02:03", "90" (seconds) or "1:02:03.500". |
| content | string | yes | The full subtitle file text. |
| part | string | – | Which half to return. Default "a" (before the split point). |
| to | string | – | Output format. Default: same as the input. |
No output schema declared.
No examples provided.
text_to_subtitles ~137
Turn a plain transcript (one line per caption) into an SRT file with evenly spaced timecodes. Timing is a starting point, not a real transcription — say so when you present the result.
| Name | Type | Req | Description |
|---|---|---|---|
| content | string | yes | Plain text, one caption per line. Blank lines are skipped. |
| duration_seconds | number | – | Seconds each cue stays on screen. Default 2.5. |
| max_chars_per_cue | number | – | Split longer lines into several cues at word boundaries. Default 0 = never split. |
| start_seconds | number | – | Timecode of the first cue, in seconds. Default 0. |
No output schema declared.
No examples provided.
What is the Subtitle Toolkit MCP server?
Subtitle Toolkit is an MCP server listed in the public MCP registry as top.toolboxes/subtitle-toolkit. Convert, clean, retime and validate SRT, WebVTT, ASS/SSA, SBV and TTML subtitles. 8 tools. This page covers its hosted endpoint (https://subtitle-mcp.toolboxes.top/mcp).
Is the Subtitle Toolkit MCP server safe to use?
Subtitle Toolkit scores 65 out of 100 on VerifyMCP. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.
What tools does the Subtitle Toolkit MCP server expose?
Subtitle Toolkit exposes 8 tools: convert_subtitle, clean_subtitles, retime_subtitles, check_subtitle_timing, merge_subtitles, and 3 more. Their descriptions and schemas cost roughly 1,189 tokens of context every time the server is loaded.
Does the Subtitle Toolkit MCP server require authentication?
No. We connected to Subtitle Toolkit without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.
Is the Subtitle Toolkit MCP server still maintained?
Subtitle Toolkit is still listed as active in the MCP registry. We last reached this channel on 28 September 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.