A Guide to Claude Code 2.0 and Getting Better at Coding Agents
A tutorial by sankalp. Featured in the OTF curated resource library.
Understanding Claude Code 2.0
Claude Code 2.0 represents a significant leap in agentic coding capabilities. Unlike traditional autocomplete tools, Claude Code operates as a full agent — it reads your codebase, plans changes across multiple files, runs commands, and iterates based on results.
The key difference from version 1.x is the improved context window management and the ability to maintain persistent project understanding. Claude Code 2.0 builds a mental model of your project architecture that carries across conversations within a session.
This means your workflow should shift from micro-level prompts ("write a function that...") to macro-level intent ("add user authentication to this app using the existing database schema"). The agent excels when given clear goals and enough context to make architectural decisions.
Project Setup for Success
Before writing your first prompt, invest 10 minutes in setting up your project for optimal Claude Code interaction.
Create an AGENTS.md file
This file at your project root gives Claude Code context about your project's conventions, architecture, and preferences. Include your tech stack, file naming conventions, testing approach, and any patterns you want enforced.
# AGENTS.md ## Tech Stack - React + TypeScript + Vite - Tailwind CSS for styling - React Query for data fetching ## Conventions - Use functional components only - Prefer named exports - Place hooks in src/hooks/ - Keep components under 150 lines
Organize your codebase clearly
Claude Code performs best with well-organized projects. Use clear directory structures, consistent naming patterns, and keep related files close together. The agent uses file paths and names as context signals.
Keep a running context document
Maintain a `CONTEXT.md` or `TODO.md` that describes what you're working on, recent decisions, and next steps. Reference it in your prompts: "Read CONTEXT.md and continue with the next task."
Effective Prompting Patterns
Be Specific About Scope
Instead of "fix the bug", say "The login form on `src/pages/LoginPage.tsx` submits but doesn't redirect to /dashboard. Check the `onSubmit` handler and the router configuration in `App.tsx`."
Provide Examples of Desired Output
When asking for new components, reference existing ones: "Create a `UserCard` component following the same pattern as `ProjectCard` in `src/components/shared/ProjectCard.tsx`."
Use Iterative Refinement
Start broad, then narrow. First: "Add a search feature to the explore page." Then: "The search should debounce by 300ms and highlight matching text in results."
Ask Claude to Think First
Prefix complex tasks with: "Before making changes, analyze the current codebase and outline your plan. Then implement it step by step." This produces better architectural decisions.
Multi-File Editing Workflows
One of Claude Code 2.0's strongest capabilities is coordinating changes across multiple files. Here's how to leverage it effectively:
Feature Branches in Conversation: Treat each Claude Code session like a feature branch. Start by describing the complete feature, let the agent plan the changes, then review the full diff before accepting.
Reference the Dependency Chain: When a change touches multiple layers (database → API → hooks → components), explicitly mention the chain: "This change needs to flow from the database schema through the API endpoint, the React Query hook, and finally the component that displays it."
Use Checkpoints: After each significant change, ask Claude to verify: "Run the type checker and fix any errors." This prevents cascading issues across files.
Debugging with Claude Code
Claude Code is surprisingly effective at debugging when given the right information.
Share the error message verbatim
Copy-paste the full error output, including stack traces. Don't paraphrase—the exact error text contains crucial information that Claude Code can pattern-match against known issues.
Describe the expected vs actual behavior
"When I click Submit, I expect the form to save and show a success toast. Instead, nothing happens and the console shows a 401 error." This framing gives the agent both the goal and the symptom.
Let the agent investigate
Rather than guessing the cause yourself, say: "Investigate why this error occurs. Read the relevant files, check the network request, and propose a fix." The agent often finds root causes faster than directed debugging.
Common Pitfalls to Avoid
Don't Overload a Single Prompt
Asking for 5 unrelated changes in one prompt leads to confusion. Break complex work into sequential, focused requests.
Don't Ignore the Agent's Warnings
When Claude Code says "this might break X", listen. It has seen the full codebase and is flagging real risks.
Don't Skip Code Review
Always review the generated diff before accepting. Agents are powerful but not infallible—especially with edge cases and security-sensitive code.
