Flompt

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🎥 Demo

Try it live at flompt.dev, free, no account needed.

Paste any prompt. The AI breaks it into typed blocks. Drag, reorder, compile to Claude-optimized XML.

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✨ What is flompt?

flompt is a visual prompt engineering tool.

Instead of writing one long block of text, flompt lets you:

1. Paste any prompt and let the AI break it into structured blocks
2. Drag, connect, and reorder blocks in a flowchart editor
3. Compile to a Claude-optimized, machine-ready XML prompt

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🧩 Block Types

16 specialized blocks that map directly to Claude's prompt engineering best practices:

Block	Purpose	Claude XML
Document	External content grounding	<documents><document>
Role	AI persona & expertise	<role>
Tools	Callable functions the agent can use	<tools>
Audience	Who the output is written for	<audience>
Context	Background information	<context>
Environment	System context: OS, paths, date, runtime	<environment>
Objective	What to DO	<objective>
Goal	End goal & success criteria	<goal>
Input	Data you're providing	<input>
Constraints	Rules & limitations	<constraints>
Guardrails	Hard limits and safety refusals	<guardrails>
Examples	Few-shot demonstrations	<examples><example>
Chain of Thought	Step-by-step reasoning	<thinking>
Output Format	Expected output structure	<output_format>
Response Style	Verbosity, tone, prose, markdown (structured UI)	<format_instructions>
Language	Response language	<language>

Blocks are automatically ordered following Anthropic's recommended prompt structure.

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🚀 Try It Now

flompt.dev, free and open-source, no account needed.

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🧩 Browser Extension

Use flompt directly inside ChatGPT, Claude, and Gemini without leaving your tab.

• Injects an Enhance button into the AI chat input
• Bidirectional sync between the sidebar and the chat
• Works on ChatGPT, Claude, and Gemini

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🤖 Claude Code Integration (MCP)

flompt exposes its core capabilities as native tools inside Claude Code via the Model Context Protocol (MCP).

Once configured, you can call decompose_prompt, compile_prompt, and list_block_types directly from any Claude Code conversation, no browser, no copy-paste.

Installation

Option 1: CLI (recommended)

claude mcp add --transport http --scope user flompt https://flompt.dev/mcp/

The --scope user flag makes flompt available in all your Claude Code projects.

Option 2: ~/.claude.json

{
  "mcpServers": {
    "flompt": {
      "type": "http",
      "url": "https://flompt.dev/mcp/"
    }
  }
}

Available Tools

Once connected, 3 tools are available in Claude Code:

decompose_prompt(prompt: str)

Breaks down a raw prompt into structured blocks (role, objective, context, constraints, etc.).

• Uses Claude or GPT on the server if an API key is configured
• Falls back to keyword-based heuristic analysis otherwise
• Returns a list of typed blocks + full JSON to pass to compile_prompt

Input:  "You are a Python expert. Write a function that parses JSON and handles errors."
Output: ✅ 3 blocks extracted:
          [ROLE] You are a Python expert.
          [OBJECTIVE] Write a function that parses JSON…
          [CONSTRAINTS] handles errors
        📋 Full blocks JSON: [{"id": "...", "type": "role", ...}, ...]

compile_prompt(blocks_json: str)

Compiles a list of blocks into a Claude-optimized XML prompt.

• Takes the JSON from decompose_prompt (or manually crafted blocks)
• Reorders blocks following Anthropic's recommended structure
• Returns the final XML prompt with an estimated token count

Input:  [{"type": "role", "content": "You are a Python expert", ...}, ...]
Output: ✅ Prompt compiled (142 estimated tokens):

        <role>You are a Python expert.</role>
        <objective>Write a function that parses JSON and handles errors.</objective>

list_block_types()

Lists all 16 available block types with descriptions and the recommended canonical ordering. Useful when manually crafting blocks.

Typical Workflow

1. decompose_prompt("your raw prompt here")
   → get structured blocks as JSON

2. (optionally edit the JSON to add/remove/modify blocks)

3. compile_prompt("<json from step 1>")
   → get Claude-optimized XML prompt, ready to use

Technical Details

Property	Value
Transport	Streamable HTTP (POST)
Endpoint	https://flompt.dev/mcp/
Session	Stateless (each call is independent)
Auth	None required
DNS rebinding protection	Enabled (flompt.dev explicitly allowed)

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🛠️ Self-Hosting (Local Dev)

Requirements

• Python 3.12+
• Node.js 18+
• An Anthropic or OpenAI API key (optional, heuristic fallback works without one)

Setup

Backend:

cd backend
python -m venv .venv && source .venv/bin/activate
pip install -r requirements.txt
cp .env.example .env   # add your API key
uvicorn app.main:app --reload --port 8000

App (Frontend):

cd app
cp .env.example .env   # optional: add PostHog key
npm install
npm run dev

Blog:

cd blog
npm install
npm run dev   # available at http://localhost:3000/blog

Service	URL
App	http://localhost:5173
Backend API	http://localhost:8000
API Docs (Swagger)	http://localhost:8000/docs
MCP endpoint	http://localhost:8000/mcp/

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⚙️ AI Configuration

flompt supports multiple AI providers. Copy backend/.env.example to backend/.env:

# Anthropic (recommended)
ANTHROPIC_API_KEY=sk-ant-...
AI_PROVIDER=anthropic
AI_MODEL=claude-3-5-haiku-20241022

# or OpenAI
OPENAI_API_KEY=sk-...
AI_PROVIDER=openai
AI_MODEL=gpt-4o-mini

Without an API key, flompt uses a keyword-based heuristic decomposer and still compiles structured XML.

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🚢 Production Deployment

This section documents the exact production setup running at flompt.dev. Everything lives in /projects/flompt.

Architecture

Internet
   │
   ▼
Caddy (auto-TLS, reverse proxy)    ← port 443/80
   ├── /app*         → Vite SPA static files (app/dist/)
   ├── /blog*        → Next.js static export (blog/out/)
   ├── /api/*        → FastAPI backend (localhost:8000)
   ├── /mcp/*        → FastAPI MCP server (localhost:8000, no buffering)
   ├── /docs*        → Reverse proxy to GitBook
   └── /             → Static landing page (landing/)
         ↓
   FastAPI (uvicorn, port 8000)
         ↓
   Anthropic / OpenAI API

Both Caddy and the FastAPI backend are managed by supervisord, itself watched by a keepalive loop.

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1. Prerequisites

# Python 3.12+ with pip
python --version

# Node.js 18+
node --version

# Caddy binary placed at /projects/flompt/caddy
# (not committed to git, download from https://caddyserver.com/download)
curl -o caddy "https://caddyserver.com/api/download?os=linux&arch=amd64"
chmod +x caddy

# supervisor installed in a Python virtualenv
pip install supervisor

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2. Environment Variables

Backend (backend/.env):

ANTHROPIC_API_KEY=sk-ant-...       # or OPENAI_API_KEY
AI_PROVIDER=anthropic              # or: openai
AI_MODEL=claude-3-5-haiku-20241022 # model to use for decompose/compile

App frontend (app/.env):

VITE_POSTHOG_KEY=phc_...           # optional analytics
VITE_POSTHOG_HOST=https://eu.i.posthog.com

Blog (blog/.env.local):

NEXT_PUBLIC_POSTHOG_KEY=phc_...
NEXT_PUBLIC_POSTHOG_HOST=https://eu.i.posthog.com

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3. Build

All assets must be built before starting services. Use the deploy script or manually:

Full deploy (build + restart + health check):

cd /projects/flompt
./deploy.sh

Build only (no service restart):

./deploy.sh --build-only

Restart only (no rebuild):

./deploy.sh --restart-only

Manual build steps:

# 1. Vite SPA → app/dist/
cd /projects/flompt/app
npm run build
# Output: app/dist/ (pre-compressed with gzip, served by Caddy)

# 2. Next.js blog → blog/out/
cd /projects/flompt/blog
rm -rf .next out   # clear cache to avoid stale builds
npm run build
# Output: blog/out/ (full static export, no Node server needed)

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4. Process Management

Production processes are managed by supervisord (supervisord.conf):

Program	Command	Port	Log
flompt-backend	uvicorn app.main:app --host 0.0.0.0 --port 8000	8000	/tmp/flompt-backend.log
flompt-caddy	caddy run --config /projects/flompt/Caddyfile	443/80	/tmp/flompt-caddy.log

Both programs have autorestart=true and startretries=5, they automatically restart on crash.

Start supervisord (first boot or after a full restart):

supervisord -c /projects/flompt/supervisord.conf

Common supervisorctl commands:

# Check status of all programs
supervisorctl -c /projects/flompt/supervisord.conf status

# Restart backend only (e.g. after a code change)
supervisorctl -c /projects/flompt/supervisord.conf restart flompt-backend

# Restart Caddy only (e.g. after a Caddyfile change)
supervisorctl -c /projects/flompt/supervisord.conf restart flompt-caddy

# Restart everything
supervisorctl -c /projects/flompt/supervisord.conf restart all

# Stop everything
supervisorctl -c /projects/flompt/supervisord.conf stop all

# Read real-time logs
tail -f /tmp/flompt-backend.log
tail -f /tmp/flompt-caddy.log
tail -f /tmp/flompt-supervisord.log

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5. Keepalive Watchdog

keepalive.sh is an infinite bash loop (running as a background process) that:

1. Checks every 30 seconds whether supervisord is alive
2. If supervisord is down, kills any zombie process occupying port 8000 (via inode lookup in /proc/net/tcp)
3. Restarts supervisord
4. Logs all events to /tmp/flompt-keepalive.log

Start keepalive (should be running at all times):

nohup /projects/flompt/keepalive.sh >> /tmp/flompt-keepalive.log 2>&1 &
echo $!   # note the PID

Check if keepalive is running:

ps aux | grep keepalive.sh
tail -f /tmp/flompt-keepalive.log

Note: keepalive.sh uses the same Python virtualenv path as supervisord. If you reinstall supervisor in a different venv, update SUPERVISORD and SUPERVISORCTL paths at the top of keepalive.sh.

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6. Caddy Configuration

Caddyfile handles all routing for flompt.dev. Key rules (in priority order):

/blog*      → Static Next.js export at blog/out/
/api/*      → FastAPI backend at localhost:8000
/health     → FastAPI health check
/mcp/*      → FastAPI MCP server (flush_interval -1 for streaming)
/mcp        → 308 redirect to /mcp/ (avoids upstream 307 issues)
/docs*      → Reverse proxy to GitBook (external)
/app*       → Vite SPA at app/dist/ (gzip precompressed)
/           → Static landing page at landing/

Reload Caddy after a Caddyfile change:

supervisorctl -c /projects/flompt/supervisord.conf restart flompt-caddy
# or directly:
/projects/flompt/caddy reload --config /projects/flompt/Caddyfile

Caddy auto-manages TLS certificates via Let's Encrypt, no manual SSL setup needed.

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7. Health Checks

The deploy script runs these checks automatically. You can run them manually:

# Backend API
curl -s https://flompt.dev/health
# → {"status":"ok","service":"flompt-api"}

# Landing page
curl -s -o /dev/null -w "%{http_code}" https://flompt.dev/
# → 200

# Vite SPA
curl -s -o /dev/null -w "%{http_code}" https://flompt.dev/app
# → 200

# Blog
curl -s -o /dev/null -w "%{http_code}" https://flompt.dev/blog/en
# → 200

# MCP endpoint (requires Accept header)
curl -s -o /dev/null -w "%{http_code}" \
  -X POST https://flompt.dev/mcp/ \
  -H "Content-Type: application/json" \
  -H "Accept: application/json, text/event-stream" \
  -d '{"jsonrpc":"2.0","method":"tools/list","id":1}'
# → 200

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8. Updating the App

After a backend code change:

cd /projects/flompt
git pull
supervisorctl -c supervisord.conf restart flompt-backend

After a frontend change:

cd /projects/flompt
git pull
cd app && npm run build
# No service restart needed, Caddy serves static files directly

After a blog change:

cd /projects/flompt
git pull
cd blog && rm -rf .next out && npm run build
# No service restart needed

After a Caddyfile change:

supervisorctl -c /projects/flompt/supervisord.conf restart flompt-caddy

Full redeploy from scratch:

cd /projects/flompt && ./deploy.sh

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9. Log Files Reference

File	Content
/tmp/flompt-backend.log	FastAPI/uvicorn stdout + stderr
/tmp/flompt-caddy.log	Caddy access + error logs
/tmp/flompt-supervisord.log	supervisord daemon logs
/tmp/flompt-keepalive.log	keepalive watchdog events

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🏗️ Tech Stack

Layer	Technology
Frontend	React 18, TypeScript, React Flow v11, Zustand, Vite
Backend	FastAPI, Python 3.12, Uvicorn
MCP Server	FastMCP (streamable HTTP transport)
AI	Anthropic Claude / OpenAI GPT (pluggable)
Reverse Proxy	Caddy (auto-TLS via Let's Encrypt)
Process Manager	Supervisord + keepalive watchdog
Blog	Next.js 15 (static export), Tailwind CSS
Extension	Chrome & Firefox MV3 (content script + sidebar)
i18n	10 languages: EN FR ES DE PT JA TR ZH AR RU

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🌍 Features

• 🎨 Visual flowchart editor with drag-and-drop blocks (React Flow)
• 📋 Dual-view editor: toggle between canvas and card list at any time
• 👁️ Hide/show any block; hidden blocks are excluded from the assembled prompt
• 📑 Duplicate any block in one click from the List View
• 🤖 AI-powered decomposition: paste a prompt, get structured blocks
• 🔄 Async job queue for non-blocking decomposition with live progress
• 🦾 XML output structured following Anthropic best practices
• 🧩 Browser extension for ChatGPT, Claude, and Gemini (Chrome + Firefox)
• 🔌 Claude Code MCP: native tool integration via Model Context Protocol
• 📱 Responsive with full touch support
• 🌙 Dark theme
• 🌐 10 languages: EN, FR, ES, DE, PT, JA, TR, ZH, AR, RU, each with a dedicated indexed page for SEO
• 💾 Auto-save via local Zustand persistence
• ⌨️ Keyboard shortcuts
• 📋 Export as TXT or JSON
• 🔓 MIT licensed, self-hostable

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🤝 Contributing

Contributions are welcome: bug reports, features, translations, and docs!

Read CONTRIBUTING.md to get started. The full changelog is in CHANGELOG.md.

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📄 License

MIT, built by Nyrok

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