Codex CLI session transcripts for reproducibility
Resolved 💬 4 comments Opened Aug 27, 2025 by alianwaar73 Closed Sep 29, 2025
What feature would you like to see?
Summary
- Purpose: Persist a privacy-safe transcript of Codex CLI sessions to aid future reference, onboarding, and reproducibility.
- Modes: Autogenerated during sessions and on-demand via
/transcribeor/summarize. - Scope: Session summaries and verbatim logs (with redaction), stored in-repo and kept current as the project evolves.
- Parity: Lives alongside
AGENTS.mdas a canonical, evolving artifact relevant to the repo/project. - Inspiration: Inspired by Codex v0.25.0’s transcript highlight shortcut (Ctrl+T), extending it into persistent, commit-friendly artifacts.
Motivation
- Reproducibility: Capture decisions, commands, and reasoning to rerun or audit work.
- Onboarding: Provide new contributors a concise evolution of agent interactions and key changes.
- Traceability: Link tool calls and patches to resulting files/commits for clearer provenance.
- Knowledge retention: Preserve ephemeral chat context and CLI actions beyond scrollback.
- Reduce drift: Keep a living record, similar in importance to
AGENTS.md, that evolves with user interactions and the project itself.
Goals
- Configurable transcripts: Per-session summary and optional verbatim logs with redaction.
- Git-friendly storage: Text-first artifacts safe to commit; deterministic filenames.
- Minimal friction: “Always-on” auto mode and explicit slash commands.
- Privacy by default: Built-in secret redaction and opt-outs for sensitive content.
Non-Goals
- Full deterministic replay of entire sessions beyond what’s logged.
- Storing raw sensitive data or non-consented PII.
- Replacing
AGENTS.md; instead, complement or cross-link it.
User Stories
- Contributor: “As a user, I want a session summary I can commit so teammates can understand what changed and why.”
- Maintainer: “As a maintainer, I want a redact-safe transcript to audit agent actions without leaking secrets.”
- New teammate: “As a newcomer, I want a chronological record to see how the project evolved via Codex.”
- Security lead: “As a security reviewer, I need configurable redaction and opt-out options per module.”
Proposed Design
- Transcript store: Create
codex/transcripts/at repo root (or.codex/transcripts/if hidden preferred). - Session files:
- Summary:
YYYY-MM-DD_session-N_summary.md(high-level, commit-friendly). - Verbatim:
YYYY-MM-DD_session-N_log.md(detailed, redacted). - Index: Maintain
codex/TRANSCRIPTS.mdwith a chronological index and links, plus cross-link fromAGENTS.md. - Redaction: Apply default secret scrubbing + user-defined patterns before writing to disk.
- Hooks: Emit transcript entries on tool calls, patches, plan updates, and important assistant messages.
UX Flows
- Auto mode: Enable in config; Codex streams content to transcript files as the session progresses.
- Slash commands:
/.transcribe start|stop: Toggle logging within a session./.summarize [level]: Generate a summary now (concise|detailed)./.transcribe redact add "<regex>": Add runtime redaction rules.- Session end: Auto-append final summary and “next steps” to the summary file and update the index.
Data & Storage
- Paths:
codex/transcripts/for per-session files.codex/TRANSCRIPTS.mdtop-level index.- File hygiene: Keep each session self-contained; limit single-file growth; prefer multiple small files.
- Determinism: Name sessions by date and increment; include optional repo SHA short-hash in filename.
Privacy & Redaction
- Defaults: Redact common secrets by pattern (API keys, tokens,
.envvalues, private keys). - Context-aware scrubbing: Mask outputs from known sensitive files (
.env,id_rsa, OS keychains). - Custom rules: Allow config-level and command-level regex/additive rules; preview redaction before write on demand.
- Opt-outs: Respect per-project settings to disable verbatim logs or specific data classes.
- Manual confirmation: Prompt before logging large binary outputs or suspected secrets.
Configuration
- File:
codex/config.json(or leverage existing Codex config if present). - Keys:
transcripts.enabled(bool),transcripts.mode(auto|manual),transcripts.level(summary|verbatim|both).transcripts.path(string),transcripts.filenameTemplate(string).transcripts.redaction.enabled(bool),transcripts.redaction.patterns(array of regex),transcripts.maxOutputBytes(int).transcripts.gitIntegration.commitMessageTemplate(string).- Overrides: Per-submodule overrides when running from nested directories.
Git Integration
- Friendly commits: Optionally suggest or stage transcript files with a templated message.
- Linking: Include commit SHAs and file paths in transcripts; embed links to diffs when available.
- CI safety: Ensure transcripts contain no secrets; provide a pre-commit redaction check.
File Format
- Markdown: Human-readable, reviewable in PRs, easily diffed.
- Sections (summary): Context, high-level plan, key commands run, files modified, rationale, next steps.
- Sections (verbatim): Timestamps, user prompts, assistant responses (truncated if needed), tool calls, command outputs (redacted).
- Metadata header: Session ID, repo status (branch/SHA), Codex version, config snapshot hash.
API / Extensibility
- Events: Expose transcript lifecycle events (
onStart,onEntry,onError,onEnd) for plugins. - Export: Provide
codex export --session <id> --format <md|json>for downstream tooling. - Query:
codex transcripts list|show <id>to browse and inspect past sessions.
Acceptance Criteria
- Creates and updates
codex/transcripts/*.mdandcodex/TRANSCRIPTS.mdin a sample repo. - Captures tool calls, patches, and plan updates with timestamps.
- Redacts secrets by default; supports user-defined patterns.
/.transcribe start|stopand/.summarizework during a session.- Produces clean, commit-safe Markdown that passes a pre-commit redaction check.
- Scales across multi-module repos without leaking unrelated secrets.
Open Questions
- Should default location be hidden (
.codex/transcripts/) to reduce noise? - Do we include partial command outputs by default (first/last N lines) to balance size vs. context?
- Should there be a “private transcript” mode written outside the repo for sensitive sessions?
- How to handle extremely long sessions—rollover policy by size/time?
Risks
- Accidental sensitive data capture if redaction misses a pattern.
- Repository noise if transcripts are too verbose or misconfigured.
- User confusion between
AGENTS.mdand transcripts without clear cross-linking.
Mitigations
- Conservative defaults, pre-commit redaction checks, and prominent warnings.
- Concise summaries by default; verbatim requires explicit enable or size caps.
- Clear cross-links and a short “How to use transcripts” block in
AGENTS.md.
Future Work
- Replay assist: Generate a minimal “reproduce session” script for core steps.
- Semantic search: Index transcripts for query across sessions.
- Inline PR annotations: Auto-comment key session excerpts relevant to a PR.
- Multi-user sessions: Merge transcripts from multiple teammates with authorship tags.
Are you interested in implementing this feature?
_No response_
Additional information
Codex-cli should be the main product offered with the plus subscription. Way easier to use than the web-based product.
4 Comments
There is now the transcript feature Ctrl+T. We would come pretty far with just an option to be able to save these transcripts.
This seems to be the instructions in
AGENTS.md, added in https://github.com/alianwaar73/rust_ownership/commit/41f1dd69420f8c57e842d7116c45cf53abff5b49 (history):> - Consult
/home/anwaar-ali/.codexdirectory for any relevant context pertaining usage metrics and other session related data to keep TRANSCRIPT.md updated. Data and metrics such as token usage, session id, session duration, briefly and overall a list of tasks and problems that came up. If a piece of data or metrics seems absent withinhome/anwaar-ali/.codexin verbatim manner then try to infer or calculate it based on the available data. I might not always provide verbatim names for datum, variables, or metrics. Use your discretion to infer and calculate.> - I can ask you during or at the end of session to create or update the TRANSCRIPT.md, transcribe our interactions so far, or simply let's wrap up for now. If I do not specifically ask, then at the end of each major milestone such as a significant code change or after a git sync, remind me about the transcription. Also, when you encounter a recurrent problem and solve it remind me whether I want its record saved. Other things, along these lines, I leave up to your discretion regarding effective transcription. Again, it is about the codex-user interaction more than anything else.
> - The purpose of TRANSCRIPT.md is to keep a record of my interactions with you in a manner that can be reproduced later.
> - Mention all the problems you encounter during our chat sessions and how you resolved them in TRANSCRIPT.md
> - TRANSCRIPT.md should be an evolving record of our time-stamped interactions. Easy to read and much simpler than the verbosity contained within
/home/anwaar-ali/.codexdirectory.> - It is has to be different than a formal and conventional README and CHANGELOG. Again, the main purpose is to store codex-user interaction to that can demostrate how a task was completed and how a problem was solved. Should contain a summary of your chain-of-thought and how I understood and interacted with it given a task.
And this is the
TRANSCRIPT.md, added in https://github.com/alianwaar73/rust_ownership/commit/c5db1b63e690743f6b04a35799a0774ed7843fa4 (history):---
While it is achievable with current tools, I still personally see that there would be benefit in this being a feature, or at least some improved documentation / 'how to' guide included in the Codex docs for how to achieve it.
Though at least for my case, I think I less want the depth of a 'session transcript' and probably more something closer to an Architecture Decision Record (ADR) type thing:
I haven't thought too deeply about it; and I know it would be possible by just saving the complete transcripts (though that would be quite noisy/verbose); but essentially having an easy / 'automated'(ish) way to capture the important context and requirements I share in a codex chat 'in the moment', in a way that can be referred back to in future to improve the Agent's 'intuitive memory' for that project/etc; as I find I will often dictate things during a conversation that would be persistently useful; but the added friction of manually finding and capturing those things in a useful way means I more often than not just avoid doing it.
In some ways it feels like it has crossover with
AGENTS.md; in other ways it feels like I could just save the full transcript (either in the repo, or attached to a PR or similar); but while I don't have a fully thought through plan of what it would look like or what would work best; it does feel like there is a 'useful middle ground' for a built in feature like this.It's also possible that this feature might end up requiring too much 'individual customisation' and not be truly universal; in which case I wonder if there are 'supporting features' that would make sense to be built in. The ones that immediately come to mind are some form of 'Codex CLI extensions' support (though I guess maybe that is already achievable to some degree with MCP; but I was initially thinking something that can hook deeper into Codex); and/or some kind of 'lifecycle hooks' that would allow us to trigger custom functionality based on certain events (eg. when a chat ends/is closed/etc) (though again, maybe that is mostly achievable with a combination of
AGENTS.md+ MCP + etc)Some other related processes similar'ish to Architectural Design Records (ADRs) for potential inspiration:
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Edit: Also captured the above on a new gist for future reference: