MCP server

FusionLayer MCP server

Add shared memory and evaluation to Claude Code, Cursor, or any MCP-compatible tool.

Install npx -y @fusionlayer/mcp
What it does

Your AI coding tools get a shared memory layer

The FusionLayer MCP server registers as a local Model Context Protocol server. Any MCP-compatible client — Claude Code, Cursor, Continue, or your own tooling — can call FusionLayer tools to retrieve context, inject memory, and record results.

Memory captured in one tool is immediately available in another. A coding decision made in Cursor is available in Claude Code. Notes captured in any session are available in the next — across all your MCP clients.

  • Runs locally — no cloud required for the MCP layer itself
  • Privacy modes apply — Smart, Private, or Incognito per session
  • Works alongside the SDK — both can run in the same project
  • Auto-injects relevant context before each tool call
  • Zero-install via npx: npx -y @fusionlayer/mcp
Available MCP tools
fl_eval_basic
Call multiple vendors with the same prompt and compare responses side-by-side.
fl_eval_multi_perspective
Call multiple vendors and aggregate with consensus, union, or best strategy.
fl_eval_adversarial
Find factual contradictions between vendor responses using an LLM judge.
fl_recall_context
Search your saved context entries by semantic query.
fl_save_context
Save knowledge or context for future recall across tools.
fl_capture
Capture a thought, fact, link, or code snippet to FusionLayer memory.
Getting started
01 / GET A KEY

Get your FusionLayer API key

Sign up at app.fusionlayer.app and copy your API key from the settings page.

export FL_API_KEY=fl_...
02 / ADD CONFIG

Add to your MCP client config

Paste the config block below into your Claude Code, Cursor, or Continue configuration. No install step needed — npx runs it on demand.

npx -y @fusionlayer/mcp
03 / BRING YOUR KEYS

Add your vendor API keys

Add your own Anthropic, OpenAI, Google, or other vendor keys to the env block. FusionLayer calls them directly — your prompts never pass through FusionLayer servers.

ANTHROPIC_API_KEY=sk-ant-...
# Add to your MCP client config (Claude Code, Cursor, Continue)
{
  "mcpServers": {
    "fusionlayer": {
      "command": "npx",
      "args": ["-y", "@fusionlayer/mcp"],
      "env": {
        "FL_API_KEY": "your_fl_api_key",
        "ANTHROPIC_API_KEY": "sk-ant-...",
        "OPENAI_API_KEY": "sk-..."
      }
    }
  }
}
Client compatibility
Claude Code Available Standard MCP config — see quick start above
Cursor Available Standard MCP config — see quick start above
Continue Available Manual config — see docs
Any MCP-compatible client Available Standard MCP protocol