Add effort level to statusline JSON input

Feature Request

The statusline command script receives a JSON object via stdin with session metadata (model, context window, cost, etc.). The --effort flag (introduced in 2.1.79) is not included in this JSON schema.

Use Case

Users who customize their statusline want to display the current effort level (low/medium/high) alongside model name and context usage. Currently there is no way to access this from the statusline script.

Proposed Change

Add an effort field to the statusline JSON input:

{
  "effort": "high"
}

Environment

• Claude Code version: 2.1.81
• OS: macOS