humanpen/humanpen-mcp

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**Humanize what's flagged. Preserve the rest.** An MCP server for HumanPen — a document-level AI humanizer that can humanize an entire document, rewrite user-selected passages, or automatically target flagged text from a Turnitin / iThenticate AI-detection report, editing .docx / .pptx files in place while preserving formatting, tables, images, citations, and formulas. Also converts citations between 12 styles, condenses to a word budget, and translates between 12 languages.
Features
- **Selective rewriting by detection report** — import a Turnitin / iThenticate AI Writing Report to pinpoint flagged passages; unflagged content is never touched
- **Format in, format out** — a DOCX comes back as a DOCX, a PPTX as a PPTX; formatting, tables, images, and formulas survive intact and the result is still editable
- **Academic structure preserved** — in-text citations, reference lists, footnotes, TOC fields, cross-references, figure numbering, equations, and special formatting are treated as protected objects
- **No error injection** — restructures meaning and syntax to change expression; never adds grammar mistakes, spelling errors, or awkward sentences as a detection strategy
- **Full-length documents** — no per-input word limit; a single file can be up to 100 MB, no splitting into text boxes
- **Free to keep going** — still flagged? Re-humanize for free with a fresh report until the AI rate falls to * or 0%
- **Word-count control (experimental)** — set a min/max word range to keep the output within a target length
- **Pay per rewrite** — billed on words actually changed, not the whole document; failed and cancelled jobs cost nothing; credits never expire
Get a key
Sign up at and create a key at
. New accounts start with free credits,
enough to put a document through and see what comes back.
The key goes in an environment variable, never in a URL. URLs end up in server
logs, proxy logs, shell history and screenshots.
Install
Claude Code
-s user puts it in every project. The default scope is local, which
loads the server only in the directory you ran the command from — and looks
like a broken install the first time you open Claude Code somewhere else.
If your version rejects -e (reported
upstream), use the JSON
form:
OpenAI Codex
In ~/.codex/config.toml:
CodeBuddy / WorkBuddy
It also reads ${VAR} in its config, so the key can stay in your environment
instead of the file:
~/.codebuddy/.mcp.json for every project, /.mcp.json for one.
Gemini CLI
It has gemini mcp add, but the argument order differs between versions — run
gemini mcp add --help and follow the usage line it prints. Pass the key with
-e HUMANPEN_API_KEY=... and the scope with -s user; the default is
project, which is only the directory you ran it in.
Claude Desktop
In claude_desktop_config.json. **Use the absolute path to npx** — run
which npx and paste the result: a desktop app is launched by the OS with a
minimal PATH, so the bare name that works in your terminal often is not found
here, and the only symptom is that the tools never appear.
Cursor / Windsurf / Cline
All three read the same shape — Cursor in .cursor/mcp.json, Windsurf in