From "Claude Dev" to one million installs.
Cline, formerly Claude Dev, just crossed one million installs on the VS Code marketplace and the internet collectively lost its mind. Turns out people really do want an autonomous coding agent that does not require switching IDEs.
The Setup
Cline is a VS Code extension that runs an agent loop inside your editor. It reads files, edits them, runs terminal commands, and asks for approval at each step. The magic is the new Plan/Act split: Plan mode reads and reasons, Act mode executes.
[Plan mode]
> Audit src/lib/supabase/* and propose a migration plan to move
> from the legacy auth-helpers package to the new @supabase/ssr.
> Do not touch code yet — write the plan first.
[Act mode — after I approve]
> Execute the plan. Run the migration codemod, update types,
> and confirm `npm run typecheck` passes before stopping.The Money Pattern
The Plan/Act dance is genuinely a workflow upgrade. I used it on a Rebuild Relief Supabase upgrade last week — Plan gave me a 9-step migration outline, I tweaked two steps, then Act executed cleanly with approvals at each file write. It feels like pair programming with someone who actually reads before they type.
It is BYO-key, so you wire Claude or GPT or even a local Ollama model and pay only what you burn. Sensible defaults, no upsell.
The Catch
Cost. Cline is hungry. A meaningful refactor can torch $5-10 in a single session because the agent re-reads the same files repeatedly when it loops. Set hard token caps in the settings or your card will smoke.
It also gets stuck. When an edit fails three times the agent sometimes spirals — re-running the same broken command with slight variations until you yank the keyboard away. Always run on a clean git branch.
The Verdict
Cline is the easiest on-ramp from "VS Code dev" to "agentic coder". If you cannot leave the marketplace ecosystem, this is your tool. Just put it on a leash — cost caps, clean branches, and Plan mode before Act mode every single time.