MCP servers that ship as code — a repository or a package you install and run locally (usually over stdio). They have no hosted endpoint, so we cannot probe or grade them: instead each one shows its repository, install command, license, stars and when it was last updated.
Collected from GitHub repositories and npm, PyPI, Cargo, Go, Maven, NuGet and RubyGems packages tagged as MCP servers, the official MCP Registry, Docker's MCP catalog, ModelScope, Baidu MCP World, Cline and other public directories; one entry per repository. A server that also offers a hosted endpoint is listed under Remote instead. These entries are not counted in our reachability, verification or readiness statistics.
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MCP server for quantum steganography puzzles using Unicode
npm MIT -
Find the Unicode that hides meaning: bidi controls, invisibles, homoglyphs and mixed scripts.
npm MIT -
unicode-removergithub.com/hegner123/unicode-removerupdated this year
MCP/CLI tool that finds literal Unicode escape sequences (\uXXXX, \UXXXXXXXX, \u{...}) in a file and decodes or strips them. Bypasses JSON-decoding pipelines that mangle escape literals.
MIT -
unicodefyigithub.com/fyipedia/unicodefyiupdated this year
Pure Python Unicode character toolkit -- 17 encoding formats, full Unicode properties, 92 HTML entities, character search, CLI, MCP server, and REST API client.
pypi MIT -
cleaner-codegithub.com/goldmembrane/cleaner-codeupdated this year
Scans AI-generated code for invisible Unicode, Trojan Source, and supply-chain threats.
npm ISC -
Find and remove invisible Unicode characters and machine-writing punctuation from text and documents. Offline, no telemetry.
npm MIT -
Security-focused MCP server protecting against unicode attacks, injection threats, and other AI vulnerabilities
npm Apache-2.0 -
A Unicode canvas for humans and AI. Draw diagrams, interfaces, and slides as editable text.
npm MIT ★ 433 -
@oiyonet/hangul-mathactive
Zero-dependency, pure mathematical Korean Hangul Unicode engine: Choseong/Jungseong/Jongseong decomposition, automatic Josa attacher, official Revised Romanization, and Hangul search MCP.
npm MIT -
MCP server for TextWatermarking.com: embed, extract and verify invisible Unicode watermarks in text. Runs over stdio (npx) or as a remote Streamable HTTP server.
npm MIT -
cleaner-codegithub.com/goldmembrane/cleaner-codeupdated this year
AI code security scanner MCP server — detects invisible Unicode, Trojan Source, homoglyphs, Glassworm steganography, rules file backdoors, and dependency attacks in AI-generated code. Static analysis + CodeBERT deep learning. Runs locally.
npm MIT ★ 1 -
MCP server: encode and decode HTML entities, URL-encoding, and Unicode escapes.
MIT -
MCP server: slugify strings for URLs/filenames. Unicode-aware, configurable separator, case folding.
MIT -
@mukundakatta/slug-mcpgithub.com/mukundakatta/slug-mcpupdated this year
MCP server: slugify strings for URLs/filenames. Unicode-aware, configurable separator, case folding.
npm MIT -
TikTapDown MCP Server — 10 TikTok creator tools: download videos and audio, hashtags, hooks, RPM and engagement calculators, Unicode fonts, trends, keyword research. Part of the Tapdown family.
npm MIT -
Prompt-injection scanner for AI agents: deterministic, documented rules (instruction override, jailbreaks, exfiltration URLs, tool hijack/MCP tool poisoning, hidden Unicode, encoded payloads) returning a risk score, categories and spans. Library + x402 pa
npm MIT -
mcp-all-toolsgithub.com/hlteoh37/mcp-all-toolsupdated this year
All-in-one MCP server with 80+ developer tools — devutils, API, text, math, datetime, calculator, JSON diff/query, SQL format, epoch convert, AES encrypt/decrypt, RSA keygen, scrypt hash, regex replace, nanoid, CSV/JSON, hex encode, Unicode tools in a sin
npm MIT -
AX-first macOS computer use for DeepSeek Harness: accessibility snapshots with stable refs, background input, Unicode typing, menus, apps, set-of-mark screenshots, on-device OCR, verified actions, and optional Jev (TypeSafe System One) semantic guards — 1
npm MIT -
Stop prompt injection in AI inbox triage and chat agents. Scans emails, web pages and messages for instructions aimed at the AI (hidden HTML, invisible Unicode, base64, fake system markers), fences untrusted content for the prompt, and gates the tool call
npm MIT -
Prompt-injection defenses for Claude Code. A PreToolUse Bash hook blocks compositional credential-exfiltration shapes (secret read plus network, env dump to network, remote script to shell, reverse shells). A sanitizing MCP server wraps untrusted URLs and files in sentinels, strips invisible unicode, flags jailbreaks.
MIT ★ 4 -
Model Context Protocol (MCP) server for PDF: generate PDF/A and PDF/X-4 documents (dual claim) with tables, images (JPEG, PNG, JPEG 2000), charts, barcodes, SVG and forms, fine typography, right-to-left text, 32 Unicode scripts, CMYK and spot colours, cus
npm MIT -
Find and remove the characters that hide in text. The engine behind ghostchars.com, in Python and TypeScript, and the ghostchars CLI and MCP server.
NOASSERTION -
Glitch / zalgo text, crafted on purpose: studio, API, MCP server and Claude skill
NOASSERTION -
只回数字、不回正文的文本统计 MCP 服务器。单文件实现，只依赖 @modelcontextprotocol/sdk， 按路径统计行数/汉字数/词数/字节数等口径，结果中绝不包含文件正文。
MIT -
One formatting core shipped three ways: a VS Code extension, a zero-dependency CLI, and an MCP server over stdio. No network calls.
MIT -
SKEPTIC — the local text forensics lab. Paste anything, trust nothing, transmit nothing. 9 deterministic instruments · zero dependencies · browser app + REST API + MCP server.
MIT -
Find hidden prompt-injection text: ASCII smuggling, zero-width/emoji stego, bidi, homoglyphs. One layer, not a full defense: it does not judge prompt injection written in plain, visible words.
MIT