Context Lens

Renders an interactive terminal breakdown showing exact token percentages consumed by system prompts, MCP tool schemas, conversation history, and project files. Alerts when prompt caching expires.

{
  "name": "context-lens",
  "version": "1.0.8"
}

export default function setup(lens) {
  lens.on('turn.before', (metrics) => {
    lens.ui.printContextBar({
      system: metrics.systemTokens,
      tools: metrics.mcpTokens,
      user: metrics.conversationTokens
    });
  });
}