AgentTM

AgentTM (Agent Time Machine) is a local debugging tool from Jyotishmoy12 that records managed Codex sessions and workspace checkpoints. You can inspect the timeline and historical files, then restore captured files into a separate Git worktree. It is available as a Windows desktop preview and as a CLI with a browser dashboard for Windows, macOS and Linux, and is in public beta per the website.

What It Is

AgentTM is a session-history and checkpoint tool for AI coding agents, currently integrated with Codex. You run Codex through AgentTM (or use chat in the Windows desktop app), and it stores sanitized supported events plus workspace observations at baseline, final, and operation boundaries. It complements Git rather than replacing commits, branches, or code review.

How the Record, Inspect, Restore Workflow Works

After a managed run, the dashboard offers Timeline, Operations, Files and Changes views. A historical file browser shows parent-checkpoint diffs. Forking a checkpoint restores eligible captured files into an isolated Git worktree under .agenttm/worktrees without replacing the original workspace. Restoring files does not rewind the Codex conversation, and checkpoints are operation-boundary observations rather than atomic snapshots or proof of which action changed a line.

Local Storage and Desktop Features

History is stored in the project's .agenttm directory as a SQLite index, manifests and SHA-256 content-addressed file blobs, so identical bytes are shared across checkpoints. The CLI includes integrity diagnostics (agenttm doctor), session purge and explicit unreferenced-blob cleanup. The Windows desktop preview adds interactive Codex chat, model discovery, supported approval prompts, continuation of saved Codex conversations, and passphrase-encrypted history backup and restore.

Limitations and Privacy

Only AgentTM-managed Codex runs are captured; other coding agents are not integrated. Snapshots can be partial because of exclusions and size limits, and snapshot file bytes are not content-redacted. The README states AgentTM implements no telemetry or cloud sync, though Codex sends prompts and context to its configured service. The source is public but under a proprietary license that permits personal and internal business use of official binaries.