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Curated prompts for Jules, an async coding agent from Google Labs.
// Refactor {a specific} file from {x} to {y}...
General-purpose, applies to any language or repo.
// Add a test suite...
Useful for repos lacking test coverage.
// Add type hints to {a specific} Python function...
Python codebases transitioning to typed code.
// Generate mock data for {a specific} schema...
APIs, frontends, or test-heavy environments.
// Convert these commonJS modules to ES modules...
JS/TS projects modernizing legacy code.
// Turn this callback-based code into async/await...
JavaScript or Python codebases improving async logic.
// Implement a data class for this dictionary structure...
Useful for Python projects moving towards more structured data handling with dataclasses or Pydantic.
// Help me fix {a specific} error...
For any repo where you're stuck on a runtime or build error.
// Why is {this specific snippet of code} slow?
Performance profiling for loops, functions, or queries.
// Trace why this value is undefined...
Frontend and backend JS/TS bugs.
// Diagnose this memory leak...
Server-side apps or long-running processes.
// Add logging to help debug this issue...
Useful when troubleshooting silent failures.
// Find race conditions in this async code
Concurrent systems in JS, Python, Go, etc.
// Add print statements to trace the execution flow of this Python script...
For debugging complex Python scripts or understanding unexpected behavior.
// Write a README for this project
Any repo lacking a basic project overview.
// Add comments to this code
Improves maintainability of complex logic.
// Write API docs for this endpoint
REST or GraphQL backends.
// Generate Sphinx-style docstrings for this Python module/class/function...
Ideal for Python projects using Sphinx for documentation generation.
// Add integration tests for this API endpoint
Express, FastAPI, Django, Flask apps.
// Write a test that mocks fetch
Browser-side fetch or axios logic.
// Convert this test from Mocha to Jest
JS test suite migrations.
// Generate property-based tests for this function
Functional or logic-heavy code.
// Simulate slow network conditions in this test suite
Web and mobile apps.
// Write a test to ensure backward compatibility for this function
Library or SDK maintainers.
// Write a Pytest fixture to mock this external API call...
For Python projects using Pytest and needing robust mocking for testing.
// Upgrade my linter and autofix breaking config changes
JS/TS repos using ESLint or Prettier.
// Show me the changelog for React 19
Web frontend apps using React.
// Which dependencies can I safely remove?
Bloated or legacy codebases.
// Check if these packages are still maintained
Security-conscious or long-term projects.
// Set up Renovate or Dependabot for auto-updates
Best for active projects with CI/CD.
// Analyze this repo and generate 3 feature ideas
Vision-stage or greenfield products.
// Identify tech debt in this file
Codebases with messy or fragile logic.
// Find duplicate logic across files
Sprawling repos lacking DRY practices.
// Cluster related functions and suggest refactors
Projects with lots of utils or helpers.
// Help me scope this issue so Jules can solve it
For working with Jules on real issues.
// Convert this function into a reusable plugin/module
Componentizing logic-heavy code.
// Refactor this Python function to be more amenable to parallel processing (e.g., using multiprocessing or threading)...
For optimizing performance in computationally intensive Python applications.
// Write a status update based on recent commits
Managerial and async communication.
// Summarize all changes in the last 7 days
Catching up after time off.
// Add a confetti animation when {a specific} action succeeds
Frontend web apps with user delight moments.
// Inject a developer joke when {a specific} build finishes
Personal projects or team tools.
// Build a mini CLI game that runs in the terminal
For learning or community fun.
// Add a dark mode Easter egg to this UI
Design-heavy frontend projects.
// Turn this tool into a GitHub App
Reusable, platform-integrated tools.
// What's going on in this repo?
Great for legacy repos or onboarding onto unfamiliar code.
// Initialize a new Express app with CORS enabled
Web backend projects using Node.js and Express.
// Set up a monorepo using Turborepo and PNPM
Multi-package JS/TS projects with shared dependencies.
// Bootstrap a Python project with Poetry and Pytest
Python repos aiming for clean dependency and test setup.
// Create a starter template for a Chrome extension
Browser extension development.
// I want to build a web scraper—start me off
Data scraping or automation tools using Python/Node.
Your contributions are welcome! Add new prompts, fix formatting, or suggest categories.