Your AI is only as good
as your prompt.
Anthropic's own research shows that structure, not a better model, is what separates a frustrating AI interaction from a remarkable one. flompt turns that insight into a tool: decompose any prompt into 11 structured blocks, edit visually, recompile as Claude-optimized XML.
No sign-up required.
Browser Extension
Build prompts without
leaving the chat.
One install. A ✦ Enhance button appears directly in ChatGPT, Claude and Gemini. Click it to open a structured prompt builder right beside your conversation.
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Enhance button in every toolbar Injected natively alongside the existing tools. Blends in without breaking the UI.
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Bidirectional sync Your chat input flows into flompt automatically. Edit your blocks and inject the result back instantly.
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Resizable sidebar Drag the left edge to adjust the panel width. Stays out of your way when you don't need it.
Claude Code integration
Use flompt inside your agent.
flompt ships a native MCP server (Model Context Protocol). Add it once to Claude Code and decompose_prompt, compile_prompt and list_block_types become tools your agent can call directly.
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decompose_prompt Splits any raw prompt into typed blocks: role, objective, constraints and more. Ready to edit or compile.
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compile_prompt Turns a list of blocks into Claude-optimized XML, canonically ordered and ready to use.
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list_block_types Returns all 12 block types with descriptions and the recommended ordering.
claude mcp add --transport http --scope user \ flompt https://flompt.dev/mcp/
{ "mcpServers": { "flompt": { "type": "http", "url": "https://flompt.dev/mcp/" } } }
How it works
From raw input to structured prompt.
The same prompt, before and after flompt. No hand-crafting needed.
You are a helpful assistant. Write me a blog post about AI in healthcare. Make it engaging and professional. Around 800 words. Include statistics. Write in English.
<prompt> <role> Healthcare tech writer </role> <objective> 800-word blog post on AI in healthcare </objective> <constraints> Professional · 3+ stats </constraints> <examples> <example> <user_input>AI in finance</user_input> <ideal_response>...</ideal_response> </example> </examples> <format_instructions> Use markdown. No preamble. </format_instructions> </prompt>
Prompt anatomy
11 blocks for any prompt.
Every prompt is built from the same ingredients. flompt makes each one explicit, editable, and Claude-optimized.
<document>Claude best practices, built-in
Not just decompose. Optimize.
flompt applies Anthropic's official prompting guidelines automatically when you assemble. Every block knows its place.
Document grounding
The Document block wraps your content in Anthropic's <documents><document index="N"> XML format, the structure Claude is trained to parse for highest accuracy.
Structured few-shot examples
The Examples block parses your Input / Output pairs and generates <examples><user_input><ideal_response> XML, the exact format Anthropic recommends for consistent results.
Optimal block ordering
Anthropic's research shows that block order matters. flompt always places documents first, then persona, task, constraints, examples and reasoning. Automatically, without you lifting a finger.
Format Control block
A dedicated block for Claude-specific style directives: be concise, use markdown, no preamble, respond in bullet points. Assembled as <format_instructions> so Claude picks it up reliably.