PromptSharpener

Mark up your prompt before your coding assistant sees it. Works with Copilot, Cursor, Claude Code — anything you paste into.Build a better coding prompt before you paste it.

01Input5/7 filled in

Start

Start here · required
Fine-tune promptSet the environment and point of view
More fine-tuning optionsThinking, output, scope and constraints
Constraints

Context

Add evidence · required
What makes good context?
  • Relevant sourcePaste the smallest function, component, query, config, or file excerpt that owns the behavior.
  • Exact failureInclude the complete error message, stack trace, failing command, or unexpected output.
  • Expected vs. actualSay what happens now and what should happen instead, using one concrete example.
  • VerificationAdd the nearest test, reproduction steps, or command that proves the change works.

Keep it focused. Remove secrets, personal data, and unrelated files.

Useful: focused code, exact errors, small logs, configs, schemas, or request/response examples.

Best next addition: Paste the smallest function, component, query, config, or file excerpt that owns the behavior.

02Prompt preview~160 tokens
Assistant & costoptional settings
Assistant

Choose where this prompt will run. This selection updates the model and cost estimate above.

GitHub Copilot · Claude Sonnet 4.5