Local web UI for Codex CLI sessions: timeline, tokens and cost per turn

Codex writes rollout files to ~/.codex/sessions, and I wanted to see what a session did and what it cost without reading JSONL. So I built a viewer: npx agent-session-inspector It shows each session as a timeline (prompts, reasoning, tool calls, patches applied), with tokens and estimated cost per step, a per-turn list of the files the agent edited, and analytics across all sessions by project and model. It is local only: no telemetry, no outbound requests, files are read-only. MIT licensed. It also reads Claude Code, Copilot and OpenCode sessions, so you can compare agents in one place. Repo: github.com/kishanmundha/agent-session-inspector If a session renders wrong, please open an issue; the format has changed a few times.