TLDR;

Codex Log Viewer

This repository is first and foremost an automatic rewrite of the original Codex log viewer implementation into a browser-native frontend. Original project: timvw/codex-transcripts.

The primary deliverable is the JS/HTML/CSS viewer:

• codex_log_viewer.js
• codex_log_viewer.html
• codex_log_viewer.css

What This Rewrite Does

• Reads Codex session JSONL logs directly in the browser.
• Supports both legacy and wrapped event lines ({ "timestamp": ..., "payload": ... }).
• Renders user/assistant/reasoning/function-call/function-output/token-usage blocks.
• Includes collapse/expand controls, filters, markdown rendering, and lightweight code highlighting.
• Falls back to embedded inline session data when fetch is blocked/unavailable.

Primary Usage (Browser-Native)

1. Set the source file in codex_log_viewer.html:

<meta name="codex-log-source" content="example.jsonl" />

2. Serve the repo over HTTP:

python3 -m http.server 8000

3. Open:

http://localhost:8000/codex_log_viewer.html

Optional URL overrides:

http://localhost:8000/codex_log_viewer.html?source=example.jsonl
http://localhost:8000/codex_log_viewer.html?source=example.jsonl&title=Codex%20Session%20Log
http://localhost:8000/codex_log_viewer.html?source=example.jsonl&showTokenUsage=true
http://localhost:8000/codex_log_viewer.html?source=example.jsonl&collapseOutputCharThreshold=15000&collapseOutputLineThreshold=300

Notes:

• source is resolved relative to codex_log_viewer.html.
• Token usage blocks are hidden by default on initial page load; use the Token Usage filter checkbox (or showTokenUsage=true) to show them.
• If loaded from file://, fetch may be blocked by browser security. Serve via HTTP.
• If the HTML contains embedded inline session data, the viewer can render even when source fetch fails.

Session Exports in This Repo

Exported session artifacts are stored in:

• codex_sessions/
• codex_sessions/index.html (session export index page)

Naming scheme uses migration-style timestamps with meaningful suffixes, for example:

• 20260213134203_redacted_current_codex_session_jsonl_export.jsonl
• 20260213134203_redacted_current_codex_session_jsonl_export.html

Skill Docs (SKILL.md)

This repository includes a vendored Codex skill for conversation exports:

• skills/conversation-log-export/SKILL.md

What this file is:

• The skill entrypoint documentation used by Codex to understand when and how to run the export workflow.
• The source of truth for workflow steps, filtering rules, and command examples for the export script.

Related files in the same skill:

• skills/conversation-log-export/scripts/export_current_conversation.py (implementation)
• skills/conversation-log-export/agents/openai.yaml (skill metadata for agent UI/default prompt)

Current filtering behavior documented in SKILL.md:

• Drops session_meta, turn_context, event_msg, and compacted.
• Keeps event_msg rows where payload.type is token_count.
• Drops response_item rows where payload.type is reasoning or function_call_output.
• Drops developer/system prompt response_item messages.
• Drops bootstrap AGENTS directives injected as user messages (# AGENTS.md instructions for ... with <INSTRUCTIONS>...</INSTRUCTIONS>).
• Default export filename is <timestamp>_<goal-slug>.jsonl (no _conversation_only suffix).
• If exactly one commit message title is generated, its first line is used to derive <goal-slug>.
• Supports selector overrides:
  • --include row:<type>,event:<type>,response:<type>,role:<role>
  • --exclude row:<type>,event:<type>,response:<type>,role:<role>
  • --list-types to print observed selector values and default keep/drop status.
• Each export run refreshes codex_sessions/index.html so new sessions appear automatically.

Run from this repository:

python3 skills/conversation-log-export/scripts/export_current_conversation.py --with-html
python3 skills/conversation-log-export/scripts/export_current_conversation.py --list-types
python3 skills/conversation-log-export/scripts/export_current_conversation.py --include row:event_msg,row:compacted
python3 skills/conversation-log-export/scripts/export_current_conversation.py --include response:reasoning,response:function_call_output

Live examples via GitHub Pages:

• https://jerometremblay.github.io/codex_log_viewer/
• https://jerometremblay.github.io/codex_log_viewer/codex_sessions/20260213134203_redacted_current_codex_session_jsonl_export.html

License

LGPL 2.0