Every editor now has some form of AI assistance built in or bolted on, and they’re not interchangeable — inline autocomplete, chat-based assistance, and fully agentic coding tools solve genuinely different problems and fit different moments in your workflow.
Three Different Categories, Not One
- Inline autocomplete (GitHub Copilot’s core mode, Supermaven) — predicts the next few lines as you type. Best for boilerplate, repetitive patterns, and staying in flow without breaking focus to explain intent.
- Chat-based assistance (Copilot Chat, Cursor’s chat panel) — you describe a problem or ask a question, it responds with explanation and/or code. Best for understanding unfamiliar code, debugging, and design discussions.
- Agentic coding tools (Claude Code, Cursor’s agent mode, Copilot’s agent mode) — given a task description, the tool reads relevant files, makes multi-file edits, runs tests, and iterates — genuinely autonomous within a defined scope.
Where Each One Actually Saves Time
Writing a repetitive test file with predictable structure -> autocomplete "Why is this function returning undefined?" -> chat "Add pagination to this API endpoint and update the tests" -> agentic tool "What does this regex do?" -> chat Boilerplate for a new React component matching existing style -> autocomplete
The Skill That Actually Matters: Reviewing, Not Just Prompting
The biggest productivity gap between developers using these tools well and poorly isn’t prompt-writing skill — it’s how carefully they review generated output before accepting it. Treating AI-generated code with the same scrutiny as a junior developer’s pull request, rather than blind trust, is what actually determines whether these tools speed you up or quietly introduce bugs.
A Reasonable Default Workflow
Autocomplete for the boring, repetitive parts you’d type anyway; chat when you need to understand something before changing it; an agentic tool for well-scoped, describable tasks you’re comfortable reviewing carefully afterward — treating none of them as a substitute for understanding the code you ship.