# Ebook File Check (remote · powmcp.com)

Run EPUBCheck for EPUB specification errors and compare two exports.

- Trust score: 76/100 (medium)
- Change this week: +3
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-09-25

## Components

- remote · `powmcp.com`: 76/100 (this document), [markdown](https://verifymcp.io/servers/com-powmcp-epub-check/epub-check-mcp.md), [page](https://verifymcp.io/servers/com-powmcp-epub-check/epub-check-mcp)

## Channel facts

- Endpoint: `https://powmcp.com/epub-check/mcp`
- Transports: `streamable-http`
- Auth: `none`
- Version: `0.5.4`

## Trust breakdown

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. Scores are 0–100 per category. Scoring method: https://verifymcp.io/docs/scoring (what has changed: https://verifymcp.io/docs/scoring/changelog)

Scored 2026-09-25.

- **Endpoint Security**: 74/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - No authorisation is required to call this server. Every tool declares its destructiveHint and none is destructive, so open access doesn't expose one.
  - HTTPS is enforced; there's no plaintext access path.
  - HSTS check failed: the Strict-Transport-Security header is absent.
  - DNSSEC check failed: this domain isn't protected by DNSSEC.
- **Transport & Reachability**: 100/100
  - Verified streamable-http transport via a live MCP handshake.
- **Schema Quality & AI Usability**: 65/100
  - AI-judged instruction clarity (excellent).
  - Context-footprint check failed: tool/resource definitions use about 1109 tokens (~554/item across 2 items; 2 tools + 0 resources), over budget; trim descriptions and params.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 50/100
  - Stability observed for 15 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 100/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 100% of tool parameters carry a description.
  - Structured output schemas are declared (100% of tools); any adoption earns full credit.
- **Tool Safety**: 100/100
  - No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.
  - We read all 2 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 3 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 100/100
  - Implements a current MCP spec version (2026-07-28).

## Install

### How do I install the Ebook File Check MCP server?

Ebook File Check is a hosted endpoint at https://powmcp.com/epub-check/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.

### Claude

```bash
claude mcp add --transport http com-powmcp-epub-check 'https://powmcp.com/epub-check/mcp'
```

### Cursor

```json
{
  "mcpServers": {
    "com-powmcp-epub-check": {
      "url": "https://powmcp.com/epub-check/mcp"
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "com-powmcp-epub-check": {
      "type": "http",
      "url": "https://powmcp.com/epub-check/mcp"
    }
  }
}
```

### Codex

```toml
[mcp_servers.com-powmcp-epub-check]
url = "https://powmcp.com/epub-check/mcp"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "com-powmcp-epub-check": {
      "type": "remote",
      "url": "https://powmcp.com/epub-check/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add com-powmcp-epub-check --url 'https://powmcp.com/epub-check/mcp' --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  com-powmcp-epub-check:
    url: "https://powmcp.com/epub-check/mcp"
```

### Netclaw

```json
{
  "McpServers": {
    "com-powmcp-epub-check": {
      "Transport": "http",
      "Url": "https://powmcp.com/epub-check/mcp"
    }
  }
}
```

### Vellum

```bash
assistant mcp add com-powmcp-epub-check -t streamable-http -u 'https://powmcp.com/epub-check/mcp'
```

### Other

```json
{
  "mcpServers": {
    "com-powmcp-epub-check": {
      "type": "http",
      "url": "https://powmcp.com/epub-check/mcp"
    }
  }
}
```

The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.

## Changelog

Every change recorded for this component, newest first. Days that predate change tracking, or that we cannot explain, say so: "we were watching and nothing happened" and "we were not watching" are different claims.

### 2026-09-25 (score 76, 0)

- [functional] We updated how we score, so this day's move reflects our rubric, not a change to the server

### 2026-09-24 (score 76, +1)

No change was recorded against any check on this day. Stability & Change Management went from 43 to 47. That category is still filling its 30-day observation window: 13 days of observed history at the previous scan, 14 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-09-22 (score 75, +1)

No change was recorded against any check on this day. Stability & Change Management went from 37 to 40. That category is still filling its 30-day observation window: 11 days of observed history at the previous scan, 12 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-09-19 (score 74, +1)

No change was recorded against any check on this day. Stability & Change Management went from 27 to 30. That category is still filling its 30-day observation window: 8 days of observed history at the previous scan, 9 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-09-17 (score 73, +1)

No change was recorded against any check on this day. Stability & Change Management went from 20 to 23. That category is still filling its 30-day observation window: 6 days of observed history at the previous scan, 7 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-09-15 (score 72, +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.

### 2026-09-13 (score 71, +1)

No change was recorded against any check on this day. Stability & Change Management went from 7 to 10. That category is still filling its 30-day observation window: 2 days of observed history at the previous scan, 3 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-09-11 (score 70, +1)

- [functional improvement] Stability: unverified → 0.03

## MCP tools (2)

### `ebook_check` (~425 tokens)

Validates one EPUB (a directly hosted public URL or a file attached in chat) against the EPUB 2/3 specification using a pinned local EPUBCheck 5.4.0 engine run in a no-network sandbox. Each call takes exactly one source: the url parameter or the file attachment, never both. Returns the automated verdict: pass boolean, EPUB version, message counts by severity (fatal/error/warning/usage), findings grouped most-severe-first with EPUBCheck rule id (RSC-005, OPF-014, …), file path and line/column, plus a structural inventory (spine items, media types, remote-resource state), SHA-256 of the exact bytes, and truncation metadata. Use for one-file readiness and diagnosis: 'is this ebook valid', 'does this EPUB have specification problems before upload', 'what is wrong with it'. A pass means only that the bytes satisfied the automated profile; it never renders the book, judges accessibility, or guarantees any store will accept it, and human review of how the book reads and looks is always required. Downloads and validates a live EPUB under a 110-second call deadline; tell the user before the call.

Input parameters:

- `file` (object): An EPUB file attached in chat, up to 25 MB, validated from its exact bytes. Provide either this attachment or url, never both.
- `maxMessages` (integer): Maximum spec findings to return, most severe first (default 200); raise it to see more of a very noisy book, lower it to keep the answer short
- `url` (string): Direct public HTTP(S) URL to the EPUB file bytes, including the protocol, not a ChatGPT file id, local path, cloud-drive share, archive/viewer page, or authenticated URL needing a login. Each call ta…

Output parameters:

- `bytes` (number): Downloaded EPUB size in bytes
- `contentType` (string): Content-Type the server returned
- `counts` (object): Counts of EPUBCheck findings grouped by severity
- `engineVersion` (string): EPUBCheck engine version that produced the verdict
- `epubVersion` (string): Detected EPUB version, e.g. 2.0.1 or 3.0; omitted when the engine could not detect it
- `epubVersionDetected` (boolean): Distinguished state: false means the version could not be detected, distinct from a detected-but-invalid version
- `fetchedAt` (string): ISO timestamp the EPUB was fetched and validated
- `finalUrl` (string): URL after redirects, with query string and fragment stripped
- `findings` (array): Bounded spec findings, most severe first, capped by maxMessages
- `humanReviewItems` (array): Checks only a qualified human can perform
- `humanReviewRequired` (boolean): Always true: automated conformance never covers how the book reads or renders
- `inventory` (object): Structural inventory reported for the EPUB container
- `nonclaims` (array): What this automated result does not establish
- `pass` (boolean): True when the EPUB has no fatal or error messages against the automated profile
- `processingMs` (number): Total processing time in milliseconds
- `redirects` (number): Redirect hops followed
- `requestedUrl` (string): The checked EPUB source: the submitted URL with query and fragment stripped, or the attached file's name
- `ruleProfileDate` (string): Release date of the pinned EPUBCheck rule profile
- `sha256` (string): SHA-256 hash of the exact validated bytes
- `truncation` (object): Finding totals and the applied limit on returned findings

### `ebook_compare` (~372 tokens)

Runs the identical pinned EPUBCheck 5.4.0 validation over exactly two EPUB builds (directly hosted public URLs or files attached in chat, baseline first, revised second) sequentially under one shared 110-second deadline, then reports which spec findings regressed or were fixed between them. Returns per-build hashes, EPUB versions, pass verdicts and severity counts, a regressions list (rules that appear or worsen in the revised build) and a fixed list (rules removed or reduced), and a ranking by pass state then fewer blocking findings. Use for 'did my re-export get worse', 'which build has fewer problems', and revision-over-revision questions. The ranking orders automated conformance only (it never means one build renders, reads, or sells better), and when both builds tie on pass state and blocking count it names no winner rather than crowning the first submission. It also flags when the two files declare different titles, since that usually means they are not two builds of one book. Human review remains required for both builds. A comparison can take up to 110 seconds under its shared deadline; tell the user before the call.

Input parameters:

- `files` (array): Exactly two distinct EPUB builds attached in chat: the baseline build first, the revised build second. Provide either these attachments or urls, never both.
- `maxMessages` (integer): Maximum findings to collect per build for the comparison (default 150)
- `urls` (array): Exactly two distinct direct public HTTP(S) EPUB URLs: the baseline build first, the revised build second. Provide either these URLs or files, never both. STRICT RULE: Ebook compare failed: provide e…

Output parameters:

- `comparedAt` (string): ISO timestamp of the comparison
- `documents` (array): Per-build hashes, versions, and verdicts in submitted order (baseline first, revised second)
- `engineVersion` (string): EPUBCheck engine version that produced the verdicts
- `fixed` (array): Rules removed or reduced in the revised build versus the baseline
- `humanReviewItems` (array): Checks only a qualified human can perform
- `humanReviewRequired` (boolean): Always true: automated conformance never covers how either build reads or renders
- `limits` (array): Conclusions this automated comparison cannot support
- `nonclaims` (array): What these automated results do not establish
- `processingMs` (number): Total processing time in milliseconds
- `ranking` (array): Builds ranked by pass state then fewer blocking findings; unvalidatable builds last
- `regressions` (array): Rules that appear or worsen in the revised build versus the baseline
- `ruleProfileDate` (string): Release date of the pinned EPUBCheck rule profile
- `truncated` (boolean): True when either build's findings were truncated, which can make the difference table incomplete

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/com-powmcp-epub-check/epub-check-mcp#diagnostics

## Score history

- 2026-09-25: 76
- 2026-09-24: 76
- 2026-09-23: 75
- 2026-09-22: 75
- 2026-09-21: 74
- 2026-09-20: 74
- 2026-09-19: 74
- 2026-09-18: 73
- 2026-09-17: 73
- 2026-09-16: 72
- 2026-09-15: 72
- 2026-09-14: 71
- 2026-09-13: 71
- 2026-09-12: 70
- 2026-09-11: 70
- 2026-09-10: 69

## Common questions

### What is the Ebook File Check MCP server?

Ebook File Check is an MCP server listed in the public MCP registry as com.powmcp/epub-check. Run EPUBCheck for EPUB specification errors and compare two exports. This page covers its hosted endpoint (https://powmcp.com/epub-check/mcp).

### Is the Ebook File Check MCP server safe to use?

Ebook File Check scores 76 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 Ebook File Check MCP server expose?

Ebook File Check exposes 2 tools: ebook_check, ebook_compare. Their descriptions and schemas cost roughly 797 tokens of context every time the server is loaded.

### Does the Ebook File Check MCP server require authentication?

No. We connected to Ebook File Check without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.

### Is the Ebook File Check MCP server still maintained?

Ebook File Check is still listed as active in the MCP registry. We last reached this channel on 25 September 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.

## Links

- Remote endpoint: https://powmcp.com/epub-check/mcp
- Repository: https://github.com/powmcp/mcp-server-guide
- Website: https://powmcp.com/apps/epub-check/
- Changelog RSS feed: https://verifymcp.io/servers/com-powmcp-epub-check/epub-check-mcp.xml
- Changelog JSON feed: https://verifymcp.io/servers/com-powmcp-epub-check/epub-check-mcp.json
- HTML version of this page: https://verifymcp.io/servers/com-powmcp-epub-check/epub-check-mcp