Cline

Cline installs as a VS Code extension or a global npm CLI (`npm i -g cline`) and runs a single agent runtime across both surfaces. The core loop is Plan-and-Act: in Plan mode the agent maps out a strategy you can review; in Act mode it executes coordinated edits across multiple files, invokes bash commands, monitors live terminal output, and surfaces diffs at every step. Checkpoints and one-click undo guard against compounding errors. The agent supports any OpenAI-compatible model — Claude, GPT, Gemini, local Ollama/LM Studio, or your own endpoint — with bring-your-own-key and bring-your-own-weights options, so switching providers is a config change rather than a migration.

The differentiating feature is `.clinerules`: a config file that ships inside your repository and teaches the agent your team’s coding standards, architecture patterns, and deployment conventions. Every developer using Cline on that repo inherits the same behavior automatically. Combined with MCP server support for databases, APIs, and infrastructure, this means the agent operates within guardrails you define rather than inferring them from context each time.

Cline fits teams doing frequent, large-scope refactors — updating import paths across a monorepo, enforcing type consistency after a schema change, or wiring up CI automations that would otherwise need manual scripting. It also covers async and scheduled scenarios: coordinator agents delegate to specialists, run on cron, and connect to Slack, Discord, Telegram, or Linear for chat-driven triggers. The wall appears when the work requires understanding requirements that live outside the repo — in product specs, business rules, or stakeholder intent. The agent executes against what it can read; it cannot substitute for the judgment call about what to build.

The vendor reports 8M+ installs across the VS Code Marketplace and Open VSX Registry, 65.6k GitHub stars, 250+ contributors, and an Apache 2.0 license. An SDK layer lets teams embed the agent runtime in their own products via custom tool registration and lifecycle hooks. Enterprise options with contact-sales pricing are available for teams that need support contracts or compliance guarantees beyond what the open-source tier provides.