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CLI Flags & Commands

Every flag Tachyon understands, in one place.

Updated Sep 19, 2026

Common invocations
tachyon ~/your-project      # open a repo
tachyon run [dir]            # explicit start
tachyon mcp <repo-root>      # serve over MCP
tachyon context [flags] .    # offline context pack
tachyon --update             # update in place
tachyon --version
  • tachyon run [dir]: start explicitly in a directory
  • tachyon mcp <repo-root>: serve find/grep/outline/definition/intent over MCP
  • tachyon context --max-files=N --max-refs=N [--no-refs] [--no-tests] [--blame]: offline pack
  • tachyon --update: atomic self-update (Rust engine included)
  • tachyon --dev: resolve relative targets where the command ran

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