# Semantic indexing, recorded One question set run three ways against one indexed docset — keyword (BM25), vector, and the fusion of both — hits and timings as recorded. Data recorded 2026-08-31; twin built 2026-08-31. What this section is and how it is built: [Semantic indexing: two legs and a fusion](https://llms-explorer.com/essays/semantic-indexing/). ## What this section holds (11) - [CLAUDE_CODE_SYNC_SKILLS](https://llms-explorer.com/demo/) - [allowUnsandboxedCommands](https://llms-explorer.com/demo/) - [--append-system-prompt](https://llms-explorer.com/demo/) - [extraKnownMarketplaces](https://llms-explorer.com/demo/) - [--output-format stream-json](https://llms-explorer.com/demo/) - [Install Claude Code on Windows with PowerShell](https://llms-explorer.com/demo/) - [PreToolUse hook exit codes and meanings](https://llms-explorer.com/demo/) - [Which hook events fire once per turn](https://llms-explorer.com/demo/) - [Run headless in CI and get JSON output](https://llms-explorer.com/demo/) - [SessionStart versus UserPromptSubmit](https://llms-explorer.com/demo/) - [Check the installed version and update](https://llms-explorer.com/demo/)