Codec-aware MCP leaf helper. Annotates each text content block with a per-block _meta['ai.codec/leaf-tokenization'] payload so a Codec-aware gateway (or client) skips re-tokenization. The thin layer between an MCP tool author and the leaf-mode contract in

{
  "mcpServers": {
    "codecaimcp-leaf": {
      "command": "npx",
      "args": [
        "-y",
        "@codecai/mcp-leaf"
      ]
    }
  }
}