Built a developer tool that indexes and renders multi-megabyte session histories from CLI coding agents (Claude Code & OpenAI Codex) with 100% client-side privacy: 🚀 Live Tool: https://l2cache.amvo.store/en/tools/claude-session-viewer Interesting technical aspects: Web File System Access API: Reads local directory handles (~/.claude, ~/.codex/sessions) with persisted permissions in IndexedDB. 2-Pass Stream Parsing: First pass recovers metadata (cwd, Git branch, session UUIDs, tool results) and second pass resolves complex tool envelopes (item_completed, custom_tool_call, response_item). In-Browser Search Index: Sub-millisecond full-text token search across tens of thousands of turns without any server roundtrips. Feedback and bug reports welcome!   submitted by   /u/dinsaran [link]   [comments]