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Copilot Chat: The Side Panel That Changed Pair Programming
Open Copilot Chat, navigate threads, attach context, and pick models.
What You Will Learn
- Open and navigate the Copilot Chat panel.
- Start, rename, and delete chat threads.
- Attach files, selections, and screenshots to a prompt.
- Pick a model in the dropdown.
- Use chat history effectively.
Why This Matters
Inline completions are fast but limited — they can't explain, refactor across files, or answer questions. Copilot Chat is where the deeper work happens. Knowing the panel layout and attachment model multiplies your leverage.
Concept Explained
Copilot Chat is a conversational side panel that takes natural-language prompts and returns grounded responses. Unlike generic chatbots, it has access to your codebase context and can be scoped to files, selections, the terminal, or the whole workspace.
How It Works
Each chat message triggers a context-assembly pass: current selection + attached files + recent edits + chat history + explicit instructions. The assembled context is sent to the chosen model; the response streams token-by-token into the panel. Threads persist across sessions in VS Code's local storage.
Step-by-Step Tutorial
1. Open the panel
Click the Copilot icon in the activity bar or press Ctrl+I (Cmd+I). The panel opens on the right.2. Start a new thread
Click the '+' icon. Each thread has independent context — start fresh per task.3. Attach context
Click the paperclip icon to attach a file, or use @workspace / @terminal / #file syntax.4. Pick a model
Use the dropdown at the top to select GPT-5, Claude, Gemini, or Auto.5. Use history
Scroll up to see past messages. Click any to copy or re-run.Real-World Example
A QA engineer inherited a 2000-line test file. They opened Copilot Chat, attached the file, and asked 'What does this test suite cover, and what's missing?' Copilot produced a structured summary: 4 test categories, 3 missing edge cases. The QA engineer used the summary to write 3 new tests in 10 minutes — work that would have taken an hour of manual reading.
Example Prompts / Commands / Code
@workspace Explain the architecture of this project's authentication module. List the files involved and how data flows between them.@workspace This function is 80 lines. Refactor it into smaller functions with clear responsibilities. Preserve behavior. Show me the diff.Common Mistakes
- Asking Chat to write code without enough context — vague prompts get vague answers.
- Reusing the same thread for unrelated tasks — context bleeds and degrades quality.
- Forgetting to attach relevant files — Copilot can't see what you don't give it.
- Ignoring the model picker — different models suit different tasks.
Best Practices
- One thread per task. Start fresh when the topic changes.
- Attach files explicitly when the question is about specific code.
- Use @workspace for repo-wide questions.
- Try a different model if the first answer is unsatisfactory.
- Quote file:line in prompts to ground answers.
Troubleshooting
| Problem | How to Fix |
|---|---|
| Panel won't open | Verify 'GitHub Copilot Chat' extension is installed and enabled. Restart VS Code. |
| Chat says 'rate limited' | You've hit your plan's allowance. Wait, upgrade, or switch to a cheaper model. |
| Attached file not seen | Verify the file is saved. Copilot can't read unsaved buffers reliably. |
Practical Exercise
Your Turn
Open Copilot Chat. Start a thread. Attach a file from your project. Ask three layered questions: (1) what does this file do, (2) what are its main dependencies, (3) what edge cases might be missing.
Key Takeaways
- Chat is the conversational pair-programmer surface.
- One thread per task; start fresh often.
- Attach files explicitly; use @workspace for repo scope.
- Pick the model deliberately — they have different strengths.
- Chat history persists locally per editor.
Frequently Asked Questions
Is Chat separate from inline completions?
Does Chat work without internet?
Can multiple people share a Chat thread?
Further Reading
Official References
SEO Metadata
SEO title: Copilot Chat: The Side Panel That Changed Pair Programming
Meta description: Open Copilot Chat, navigate threads, attach context, and pick models.
Primary keyword: copilot chat
Secondary keywords: copilot chat: the side panel that changed pair programming
Search intent: Informational
URL slug: /github-copilot-chat-side-panel-basics
Categories: AI Tools, GitHub Copilot
Tags: GitHub Copilot, Beginner, Copilot Chat, IMCSEIAN, Tutorial, IMCSEIAN
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