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Reverse-engineered Cursor tab completion client

3 starsPython

Reverse-engineered Cursor tab completion client

by abyesilyurt·Apr 12, 2026·2 points·0 comments
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AI Analysis

●●SolidWizardryDark Horse

Reverse-engineered Cursor's protobuf API to extract tab completions.

Strengths
  • •Decodes Connect RPC protocol with protobuf over HTTP/2 streaming.
  • •Extracts JWT auth from Cursor's SQLite globalStorage database.
  • •Shows exactly how Cursor++ completions work under the hood.
Weaknesses
  • •Tied to Cursor's private API—will break when they change endpoints.
  • •Still requires Cursor installed to steal auth tokens from local storage.
Target Audience

Developers curious about Cursor's completion internals or building alternatives

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Continue · Codeium · GitHub Copilot

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