Cline

Cline is what happens when the open-source community decides agentic coding is too important to leave to proprietary editors. It is a VS Code extension that takes a task, plans an approach, then edits files, runs terminal commands, and checks its own work — pausing for your approval at each step. No subscription, no special editor; just your API key and your existing setup.

What we like

The human-in-the-loop design is the best in the category. Plan mode lets you argue with the agent's strategy before it touches a file, and every edit and command arrives as an approvable diff, which builds exactly the kind of trust auto-executing agents squander. Model freedom is the other pillar: point it at Claude for hard problems, a cheap model for boilerplate, or a local model for private code. MCP support means it can grow custom tools — database access, API integrations — that closed competitors gate behind roadmaps. And because it is open source, the pace of community-driven improvement is remarkable.

Where it falls short

Bring-your-own-key cuts both ways: heavy users routinely spend more on tokens than a Cursor subscription costs, and bills are unpredictable. There is no real autocomplete — Cline is an agent, not a completion engine — so most people pair it with something else for keystroke-level assistance. First-time setup, from choosing a provider to tuning auto-approvals, assumes a technical user.

Verdict

For developers who want serious agentic coding with full transparency and no lock-in, Cline is the default recommendation. Watch your token spend for the first month, pair it with a completion tool, and you get a top-tier agent for the price of the compute it actually uses.