Mantle MCP Server

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<a href="https://github.com/AkshitTiwarii/mantle"><img src="docs/images/banner.png" alt="Mantle: make Claude yours" width="100%"></a>

<h1>Mantle</h1> <p><b>Make Claude yours, and find the right tool for every job.</b><br> Themes, 4K wallpapers and live colors for Claude Code, your terminal and claude.ai,<br> a knowledge base of 47,000+ skills, connectors and plugins, and a check-up for your setup.</p> <p> <a href="https://github.com/AkshitTiwarii/mantle/releases/latest"><img alt="Latest release" src="https://img.shields.io/github/v/release/AkshitTiwarii/mantle?style=flat-square&color=15803d&label=release"></a> <a href="LICENSE"><img alt="MIT license" src="https://img.shields.io/github/license/AkshitTiwarii/mantle?style=flat-square&color=0a0a0a"></a> <a href="https://github.com/AkshitTiwarii/mantle/stargazers"><img alt="GitHub stars" src="https://img.shields.io/github/stars/AkshitTiwarii/mantle?style=flat-square&color=d97757"></a> <img alt="Claude Code plugin" src="https://img.shields.io/badge/Claude_Code-plugin-d97757?style=flat-square"> <a href="https://www.skills.sh/akshittiwarii/mantle/mantle-atlas"><img alt="Agent skill on skills.sh" src="https://img.shields.io/badge/skills.sh-mantle--atlas-0a0a0a?style=flat-square"></a> <img alt="Windows and macOS" src="https://img.shields.io/badge/works_on-Windows_%7C_macOS-555?style=flat-square"> </p> <p> <a href="https://mantle.akshittiwari.me"><b>Website</b></a> · <a href="#install"><b>Install</b></a> · <a href="#mantle-atlas-the-knowledge-base"><b>Atlas</b></a> · <a href="#mantle-doctor-a-check-up-for-your-setup"><b>Doctor</b></a> · <a href="#one-theme-on-every-surface"><b>Themes</b></a> · <a href="CHANGELOG.md"><b>Changelog</b></a> </p> </div>

/plugin install mantle --marketplace AkshitTiwarii/mantle

<p align="center"><img src="docs/images/atlas-in-terminal.png" alt="Claude Code in a Claude · Mantle tab with a Milky Way wallpaper, answering which connector to use for Jira with Mantle Atlas" width="88%"></p> <p align="center">_{A real Claude Code session in its Mantle tab: the wallpaper behind it, and Atlas picking the official Jira connector with its install command.}</p>

Why Mantle

Developers keep hitting the same walls with AI coding agents. Mantle fixes the ones a plugin can:

The problem	What Mantle does
"There are thousands of skills and MCP servers; which one do I actually want?"	Atlas knows 30k skills, 17k connectors and 440 plugins, recommends 1–3 with when-to-use and the exact install command, and reads your project to suggest what fits your stack.
"Is this third-party skill safe to install?"	Atlas vet scans a skill's files for network pipes, credential reads, prompt-injection text and obfuscation before you install it.
"My context fills up before I've typed anything."	Doctor shows what loads into every session (skill descriptions, CLAUDE.md, MCP servers) and what to trim.
"Claude ignores my CLAUDE.md."	Doctor flags long files, duplicate and vague rules, stale paths, and rules a hook should enforce instead.
"My MCP server won't start on Windows." / "I pasted my API key into .mcp.json."	Doctor catches npx without cmd /c, and secrets written into MCP config (without printing them).
"Permission prompts all day."	Doctor proposes a read-only starter allowlist from your project's own scripts, and flags rules that are too broad.
"Every terminal looks the same."	One theme across Claude Code, Windows Terminal / iTerm2 and claude.ai, with 4K wallpapers and colors that react to what Claude is doing.

Mantle is an independent, MIT-licensed project. It is not affiliated with Anthropic.

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What you get

	What it does
Mantle plugin (mantle/)	A Claude Code plugin that themes Claude Code, your terminal and claude.ai together, puts a wallpaper behind Claude, and recolors it live as Claude thinks, runs tools, plans, finishes or errors. Adds /mantle doctor.
Mantle Atlas (mantle/skills/mantle-atlas/)	A skill that turns Claude (or Cursor, Codex, Copilot, Gemini CLI…) into an expert on every skill, connector, plugin and Claude Code feature, with stack recommendations and a trust check.
Mantle Doctor (mantle/skills/mantle-doctor/)	A read-only check-up of your setup: context cost, CLAUDE.md hygiene, MCP problems, leaked secrets, permissions. Claude applies the fixes you approve.
Mantle web (web/)	Search the whole index, a gallery with live previews and one-click install commands, a theme maker, and "My Claude", a local dashboard of what you have installed.

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Install

In Claude Code

At the Claude Code prompt:

/plugin install mantle --marketplace AkshitTiwarii/mantle

From a shell:

claude plugin install mantle --marketplace AkshitTiwarii/mantle

In the Claude desktop app's Code tab: click + next to the prompt box → Plugins → Add marketplace AkshitTiwarii/mantle → Add plugin.

Then run /mantle to open the studio, or /mantle aurora to apply a theme everywhere.

In any other agent (Atlas and Doctor)

npx skills add AkshitTiwarii/mantle --skill mantle-atlas
npx skills add AkshitTiwarii/mantle --skill mantle-doctor

Target a specific agent with -a cursor, -a codex, -a github-copilot, -a gemini-cli, -a windsurf, -a cline, or -a '*' for all of them.

Let your agent do it

Paste this into Claude Code:

Install Mantle for me: run claude plugin install mantle --marketplace AkshitTiwarii/mantle in the terminal. When it finishes, tell me to run /reload-plugins and then /mantle aurora.

Or into Cursor, Codex, Copilot, Gemini CLI, Windsurf or Cline (swap the -a value):

Install the Mantle Atlas skill: run npx skills add AkshitTiwarii/mantle --skill mantle-atlas -a cursor -y. From now on, whenever I ask which skill, connector, plugin or setting fits a task, use mantle-atlas to answer.

The website's hero has the same prompts, one tab per agent, with a copy button.

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Everything Mantle does

One theme on every surface

<p align="center"><img src="docs/images/themes-preview.jpg" alt="The Aurora theme previewed on Claude Code, claude.ai and Windows Terminal over a 4K aurora wallpaper, with the live-state switcher" width="88%"></p>

One apply recolors three places at once:

• Claude Code: every interface color — accent, prompt border, diffs, your message background, plan and accept-edits modes, status colors — through a native theme file (~/.claude/themes/mantle.json, selected as Mantle (live) in /theme).
• Your terminal: Claude runs in its own Claude · Mantle tab with the wallpaper and matching colors (all 16 ANSI colors, opacity, blur); your other tabs stay plain.
  • Windows Terminal: run /mantle shortcut on once. After that, typing claude in any PowerShell tab opens Claude in a new Claude · Mantle tab in the same folder (set $env:MANTLE_INLINE = 1 to run it in place; /mantle shortcut off removes the shortcut from your PowerShell profile). Mantle's look is a settings fragment, so your settings.json is never edited, and changes show live. Windows Terminal ties a wallpaper to a profile, not a tab, which is why Claude gets a profile of its own. /mantle terminal everywhere on puts the look on your own profile instead.
  • macOS (iTerm2): written as an iTerm2 Dynamic Profile, Claude · Mantle, which iTerm2 picks up live; /mantle open starts Claude in it. Terminal.app can't load a wallpaper from a file, so it gets Claude Code's colors only.
• claude.ai (Chrome): page colors, a blurred wallpaper behind frosted panels, readable buttons, and a light that sweeps across the top while Claude replies. Done by a bundled Chrome extension that recolors claude.ai's own design tokens.

Each surface can also be customized separately in the studio: its own preset, accent, wallpaper, opacity or blur.

<img width="1915" height="1198" alt="Screenshot 2026-10-21 162739" src="https://github.com/user-attachments/assets/f1edbc46-23ad-4543-b2db-34d510a3146f" />

Colors that react to Claude

While you work, the Claude Code theme shifts with Claude's state:

Claude is…	Accent and prompt border turn
idle	the theme's accent
thinking	its second accent
running a tool	the info color
in plan mode	the warning color
done with an answer	success, for 2.5 s
hitting an error or refusal	error, for 5 s

On claude.ai a light sweeps across the page and the accent shifts while a reply streams. Turn reactions off with /mantle live off.

Wallpapers

• /mantle wallpaper <https URL | image file | off> downloads an image and puts it behind your terminal and claude.ai in one step.
• The website has 48 freely licensed 4K wallpapers (flowers, nature, mountains, NASA/Webb space, ocean, city, minimal, abstract), each credited to its photographer with its license. Every theme preview on the site shows one behind it.
• Your own image works everywhere: attach it on the website (it never leaves your browser tab), point /mantle wallpaper at the file, or pick it in the extension popup.

The studio pane

/mantle opens a pane beside the chat with:

• a main preset and a live swatch strip;
• on/off switches for each surface (Claude Code, Windows Terminal, claude.ai) and for live reactions;
• a Claude Code tab: idle accent, thinking color, tool-running color, your message background;
• a Terminal tab: wallpaper path, wallpaper strength, window opacity, acrylic, font, background override;
• a claude.ai tab: wallpaper, blur, dim, panel opacity, accent, the reply glow, and reinstalling the extension files;
• Apply everywhere, with a short log of what changed.

Ten presets

Ember, Aurora, Synthwave, Tokyo Night, Catppuccin Mocha, Rosé Pine, Nord Night, Forest, Deep Ocean and Paper (light). They also appear on their own in Claude Code's /theme picker.

Mantle Atlas, the knowledge base

Ask Claude things like:

• "Is there a skill for filling PDF forms?"
• "Connect Claude to Jira."
• "How do I make Claude run my tests after every edit?"
• "What's the best way to share our team's prompts?"
• "How can I change how Claude Code looks?"

Atlas answers with 1–3 options, best first: what each does, when to use it, when to skip it, the exact install command, and how to use it afterwards. It also flags anything that needs API keys or broad access.

What it knows:

Area	Curated guide (with judgment)	Full searchable index
Skills	~170 skills grouped by job, including animation, motion and video	30,483 skills from skills.sh, with install counts; top 5,000 described
Connectors (MCP)	156 connectors grouped by job, Composio included	17,145 servers from the official MCP Registry, each with a setup command
Plugins	~90 plugins, 13 marketplaces	439 plugins from Anthropic's marketplaces and Mantle
Claude Code features	37 features: what, when, how	—
Choosing a mechanism	28 goals mapped to the right tool (skill vs hook vs MCP vs plugin vs CLAUDE.md…)	—
UI customization	themes, status lines, terminals, claude.ai, wallpapers, and what can't be themed	—

Ask "what should I install for this project?" and Atlas reads your project (package.json, pyproject, go.mod, Dockerfile, CI, deploy config) and picks from its curated guides for the stack it finds, skipping what you already have. Ask "is this skill safe?" and it vets the skill's files first.

Tools that ship with it:

node mantle/skills/mantle-atlas/scripts/search.mjs "jira" --type connectors
node mantle/skills/mantle-atlas/scripts/search.mjs "pdf forms" --live   # also asks skills.sh and the MCP Registry now
node mantle/skills/mantle-atlas/scripts/recommend.mjs .                 # picks for this project's stack
node mantle/skills/mantle-atlas/scripts/vet.mjs owner/repo --skill name # trust check before installing
node mantle/skills/mantle-atlas/scripts/refresh.mjs                     # rebuild the index from live sources (~10 min)

recommend.mjs on this repo's website detects React, Tailwind, shadcn/ui, Motion and TypeScript and suggests the React and design skills, the TypeScript language server and Context7 for current docs. vet.mjs flags network pipes into a shell, credential reads, sending env vars to remote hosts, writes to shell profiles or Claude settings, permission bypasses, prompt-injection text, invisible Unicode and obfuscation, each with file:line. It is a heuristic, not a guarantee.

Claude always knows Atlas exists; the guides and index load only when a question needs them, so your context isn't flooded. Atlas never edits your memory on its own. If you ask it to "always remember," it shows you a three-line note for ~/.claude/CLAUDE.md and adds it only on your yes.

Sources: skills.sh, each skill's SKILL.md on GitHub, the official MCP Registry, Anthropic's plugin marketplaces and the Claude Code docs.

Mantle Doctor, a check-up for your setup

Run /mantle doctor in Claude Code, or ask Claude to "check my setup". It reads your config (never writes, never prints secret values) and reports:

Check	What it catches
Context cost	How many tokens load into every session from skill descriptions and CLAUDE.md files, and which skills are heaviest. Flags more than six MCP servers and points you at /context.
CLAUDE.md	Files over 200 lines, duplicate rules, vague rules ("write clean code"), paths that no longer exist, missing @imports, and "never/always" rules a hook should enforce instead.
MCP	npx servers on Windows without the cmd /c wrapper (they fail to start), and API keys written into .mcp.json or ~/.claude.json.
Skills	Duplicates installed in two places, missing descriptions, descriptions over the 1024-character limit.
Permissions	bypassPermissions, allow rules as broad as Bash(*), a readable .env, plus a read-only starter allowlist built from your project's own scripts.

## FIX · MCP server "github" runs npx directly on Windows
-> Native Windows can't spawn npx without a shell. Re-add it as: claude mcp add github -- cmd /c npx -y @modelcontextprotocol/server-github
## FIX · MCP server "github" has a secret written into its config
-> .mcp.json is usually committed: move the value to an environment variable and reference it as ${VAR}, then rotate the key if it was pushed.
## REVIEW · Broad allow rule: Bash(*)

Claude then offers each fix, applies only the ones you approve, and runs the check again. Works in any agent that reads skills: npx skills add AkshitTiwarii/mantle --skill mantle-doctor.

The website

Live at mantle.akshittiwari.me. To run it yourself (My Claude needs this, since it reads your local setup):

cd web
npm install
npm run dev

Open http://127.0.0.1:5173.

<p align="center"><img src="docs/images/explore.jpg" alt="The Explore page searching the full index for jira connectors, each with its install command and a Copy button" width="88%"></p>

• Explore: search all 47,972 skills, connectors and plugins in the index, rank by name and installs, copy the install command, and share a search as a link (/explore?q=jira&t=connectors). Press / to search.
• Gallery: themes, wallpapers, skills, connectors and plugins in one place, each with its maker's logo. Theme cards preview live on hover, cycling through Claude's states over their wallpaper. Every listing links to its source and copies its install command in one click.
• Set up with your agent: prompts for Claude Code, Cursor, Codex, GitHub Copilot, Gemini CLI, Windsurf, Cline or any agent.
• Make a theme: start from a preset, or build a theme straight from a wallpaper or your own photo (the colors are read in your browser; nothing is uploaded). Lock the colors you like and shuffle the rest with Space, undo with Ctrl+Z, check contrast on every color, and share the result as a link. Claude Code, claude.ai and the terminal update live over the wallpaper; export a Claude Code theme, a Windows Terminal scheme and a claude.ai payload.
• My Claude: a local companion (127.0.0.1 only) lists the skills, plugins, connectors, themes and marketplaces you already have, with secrets masked. Its only write is applying a Mantle theme after you confirm.

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Commands

Command	What it does
/mantle	Opens the studio pane
/mantle apply	Applies the current settings to every surface that's switched on
/mantle doctor	Runs the setup check-up for the current project
/mantle <preset>	Switches preset and applies it, e.g. /mantle synthwave
/mantle wallpaper <url | file | off>	Downloads an image and puts it behind your terminal and claude.ai
/mantle shortcut on | off	Windows: makes claude in PowerShell open in its own Claude · Mantle tab (adds or removes a marked block in your PowerShell profile)
/mantle open	Starts Claude in a new Claude · Mantle tab (Windows Terminal) or window (iTerm2) in this folder
/mantle live on | off	Turns live reactions on or off
/mantle terminal everywhere on | off	Also themes the Windows Terminal profile you run /mantle from (off by default)

Where it works

Surface	Colors	Wallpaper	Live reactions
Claude Code (terminal)	Yes	Yes, via your terminal	Yes
Windows Terminal	Yes	Yes	Colors set on apply
iTerm2 (macOS)	Yes	Yes	Colors set on apply
Terminal.app (macOS)	Claude Code's colors	No	Yes
claude.ai in Chrome	Yes	Yes	Yes (reply glow)
VS Code (terminal and Claude extension)	Follows your VS Code theme	No	No
Claude desktop app	No	No	No

The Claude desktop app's interface can't be themed: its bundle is integrity-checked. Mantle's plugin and Atlas still run in its Code tab.

Load the claude.ai extension

1. Run /mantle apply once; it writes the extension to ~/.claude/mantle/chrome-extension.
2. In Chrome open chrome://extensions, turn on Developer mode, click Load unpacked, and pick that folder.

After that every apply reaches open claude.ai tabs within seconds. The popup works on its own too: presets, accent, wallpaper upload or URL, blur, dim, panel opacity, the reply glow.

Privacy and safety

• Everything runs on your machine. The plugin makes no network calls except downloading a wallpaper you asked for.
• The website's local companion binds to 127.0.0.1, reads ~/.claude read-only, masks secrets, and writes only themes/mantle.json after you confirm.
• Atlas recommends; it never installs or configures anything unless you ask.
• Third-party skills and MCP servers run with your permissions. Atlas tells you which ones need keys or broad access; review their source before installing.

Repository layout

mantle/                    Claude Code plugin
  hooks/register.tsx       the mod: /mantle, studio pane, live reactions, wallpaper
  chrome-extension/        claude.ai extension (content script, popup, palettes)
  themes/                  10 presets as standalone Claude Code themes
  skills/mantle-atlas/     the knowledge-base skill
    SKILL.md
    references/            curated guides
    data/                  full index (skills, connectors, plugins)
    scripts/               search, recommend, vet, refresh
  skills/mantle-doctor/    the setup check-up skill (scripts/doctor.mjs)
  tests/                   plugin tests
web/                       the website (Vite, React, Tailwind, motion)
  server/                  local companion for My Claude
  scripts/build-index.mjs  turns the Atlas index into the Explore page's search data
docs/images/               README screenshots
PRODUCT.md, DESIGN.md      product and design records

Develop

claude --plugin-dir ./mantle      # run the plugin from this folder
claude plugin validate ./mantle   # check the manifest and hooks
claude plugin test ./mantle       # run the plugin tests
cd web && npm run build           # type-check and build the site

Credits

• Presets Tokyo Night, Catppuccin Mocha, Rosé Pine and Nord Night adapt the colors of Tokyo Night, Catppuccin, Rosé Pine and Nord.
• Wallpapers come from Wikimedia Commons and NASA, each credited on its card with its license (public domain, CC0, CC BY, CC BY-SA).
• Agent logos from Simple Icons (CC0); trademarks belong to their owners.
• UI components from Aceternity UI; design process with Impeccable.
• Skill and connector data from skills.sh and the official MCP Registry.

From the creator of ZeroCarbon

Mantle is made by Akshit Tiwari, who also builds ZeroCarbon.

License

MIT, see LICENSE.