Agent Trace Viewer

See what your coding agent actually did

Drop a session log here (Claude Code .jsonl), or

Nothing leaves your browser: the page cannot make network requests, and reloading forgets the session.

Reading…

Could not open that

Tools

Errors only Search

No events match these filters.

Keys: j / k move, Enter expands, / searches, e jumps to the next error.

Paste JSONL

Session log text

Help

Supported formats

Claude Code: ~/.claude/projects/<folder>/<session>.jsonl
Codex CLI: ~/.codex/sessions/YYYY/MM/DD/rollout-*.jsonl (older bare files too)
OpenAI-style messages: a JSON array, or {"messages": [...]}
Anything else as JSONL: choose "Custom mapping…" and point at the fields.

Keyboard

j / k next / previous event
Enter or Space expand or collapse
/ search, Enter next match
e next error
? this sheet, Esc close dialogs

Privacy

Your log is read and parsed inside this page. A Content-Security-Policy forbids every network request, nothing is uploaded, and log contents are never saved: reloading forgets the session. Only your settings are stored in this browser. Exports are files made locally; secret masking is best-effort.

Export a report

Exports respect your current filters. Redaction masks common secret shapes but is best-effort: read the result before sharing it.

Include event kinds

Mask these patterns

Also mask these exact strings (one per line, 3+ characters)

Preview of masked snippets

Map fields

Tell the viewer where things live in each JSON line, using dotted paths such as message.content.0.text. Suggestions come from the first lines of your file. Only these paths are remembered, never log content.

Preview (first 20 rows)

Settings

Theme

Density

Tool cards

Timestamps

Show thinking by default

Settings are saved in this browser. Log contents never are.

About

Agent Trace Viewer turns a coding-agent session log into a timeline. Parsing happens in your browser; a Content-Security-Policy blocks all network requests from this page, and log contents are never stored.

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