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haystack_readme.md

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Haystack

Haystack is a powerful search tool that indexes your open VS Code project in the background, enabling fast and efficient code search — ideal for large codebases like Chromium.

Prerequisites

  • You must have a VSCode workspace opened to the src\ folder of the Chromium repository.

Setup Instructions

  1. Install the Haystack Search Extension

    • In VS Code, click this link and install Haystack Search from the Marketplace.
    • Continue with other steps while waiting for the indexing process to complete (approximately 15 minutes for the Chromium codebase).

  2. Add MCP Server

    • Run the MCP: Add Server… command in VS Code.
    • Select "HTTP (server-sent events)".
    • Enter http://localhost:13135/mcp/sse as the server URL.
    • Provide a name (ex: "haystack-search").
    • Choose "Workspace Settings" as the scope.

  3. Enable Agent Mode

    • Switch GitHub Copilot to Agent mode using the UX dropdown to benefit from Haystack.

  4. Activate Haystack Agent Mode Prompt in various ways

    • Use the paperclip icon to Add Context... -> Instructions -> chromium_haystack
    • Configure for automatic inclusion using create user instructions
    • Use the keyboard shortcut option+command+/ on MacOS or ctrl+alt+/ on Windows -> Haystack.
    • Use the instruction shortcut with # -> #haystack.instructions.md

  5. Start Coding

    • Enjoy an enhanced GitHub Copilot experience in the Chromium repository.