**Subtext is session replay built for agents instead of humans.**
Connect Subtext, and your Codex agents can open real production sessions and investigate them directly—no scrubbing a timeline, no video to watch.
Hand your agent a Subtext link from wherever it already connects—a Sentry issue, a Linear ticket, a support thread, a PR—and it uses Agentic Session Review to jump to the right moment, inspect screenshots and accessibility trees, diff DOM state, and read console and network activity to find the root cause. Then it files the fix or hands you the finding. You review the answer, not the replay.
What your agent gets:
- **Session tools it calls directly**: open a session, jump to a moment, inspect and compare state—purpose-built so agents traverse dense session data efficiently, with fewer tokens than pointing a general agent at raw replay.
- **Best-in-class capture from Fullstory**: Fullcapture behavior, pixel-perfect screenshots on demand, DOM diffs, and windowed console and network context.
- **Privacy built for production**: precision tools for agents to mask or exclude sensitive fields, plus agent-friendly DLP scanning tools over MCP.
- **Cost-effective**: Capture every session without sampling and never miss a critical user experience or bug report. Agents review the ones that matter most.
Works with Codex or any MCP-compatible agent. Code-first install, self-serve signup, generous free tier, usage-based pricing. Bring your own agent harness—Subtext is the session context it was missing.
How to use
- 1Add it in ChatGPT
Open Subtext in ChatGPT's Plugin directory (button above), select + to add it and sign in if asked.
- 2Use it in a chat
Type @ in the composer and pick Subtext, or start your message with its name. ChatGPT may also suggest it when it fits what you ask.
Skills 6
- subtext-privacy
Privacy rule management — detect PII in sessions and manage element-block, URL, and network privacy rules. Use when you need to propose, create, list, delete, or promote privacy rules for a Fullstory org.
- subtext-review
Review a completed Subtext session and produce a structured summary. Use when you have a session URL and want to understand what happened — verify a flow, walk through a dev / staging / preview session, or summarize a captured session. Optionally emits reproduction steps on request.
- subtext-session
Session replay tools for analyzing Fullstory session recordings. Sparse API catalog — tools are self-describing.
- subtext-shared
Foundation skill for the Subtext plugin. MCP tool conventions and security rules. Read this when any skill lists it in PREREQUISITE.
- subtext-telemetry
Workflow telemetry logging — record AI-reported workflow milestones (currently the onboarding flow) for funnel analysis. Use when executing an instrumented Subtext workflow and you need to log step-by-step progress events.
- subtext-using-subtext
Overview of the Subtext plugin — when to reach for session review vs privacy tools. Read to orient before reviewing a Fullstory session or managing privacy rules.
Things to ask
- “Review this user session and provide an analysis of what happened”
- “Review recent user sessions and provide ideas for UX improvements”
- “Find the root cause for this customer-facing bug”