[Epic] Add Cursor as a Harness Provider

[santoshkumarradha]

Overview

Add Cursor as a first-class harness provider in both the Python and Go SDKs. Cursor's CLI (agent) supports headless execution with JSON/streaming output, session resume, model selection, and MCP support — making it a natural fit alongside our existing providers (claude-code, codex, gemini, opencode).

ToS Compliance

✅ Cursor's Terms of Service (Jan 13, 2026) do not prohibit automated/programmatic CLI use:

• Section 1.5 Use Restrictions cover reverse engineering, derivative works, reselling — not automation
• Section 1.7 explicitly acknowledges auto-code execution (--force flag)
• Official headless docs at cursor.com/docs/cli/headless endorse "scripts and automation workflows"
• Cloud Agents API (beta) is designed for programmatic agent management

CLI Mapping

AgentField Option	Cursor CLI Flag
Non-interactive mode	agent -p --force --trust
JSON output	--output-format json
NDJSON streaming	--output-format stream-json
Working directory	--workspace <path>
Model selection	--model <model>
Session resume	--resume <chatId>
Permission mode	--mode plan|ask|agent
MCP auto-approve	--approve-mcps
Auth	--api-key <key> or CURSOR_API_KEY env

Child Issues

• [harness] Add Cursor CLI provider to Python SDK #292 — Python SDK: Add CursorProvider to sdk/python/agentfield/harness/providers/
• [harness] Add Cursor CLI provider to Go SDK #293 — Go SDK: Add CursorProvider to sdk/go/harness/
• [harness] Add Cursor harness integration example #294 — Example: Create Cursor harness usage example
• [harness] Add Cloud Agent API providers (Cursor, Copilot, Claude Agent SDK) #295 — Cloud Agents: Add Cloud Agent API providers (Cursor, Copilot, Claude Agent SDK)
• Agent-Field/website-docs#56 — Docs: Add Cursor harness documentation

Installation

Users must install Cursor CLI separately:

curl https://cursor.com/install -fsS | bash

Or set custom binary path via cursor_bin config field.