Gives Gemini CLI session replay built for agents: find and review real user sessions, see what broke, and manage privacy rules.
by Fullstory· Data & analyticsUnclaimed · Yours? Claim it
4 images
About
Subtext is Fullstory's session replay built for agents. It captures production sessions of your web app and lets your agent read them as structured data: the pages a user visited, their clicks, console errors and network calls, and what the screen showed at any moment. As a Gemini CLI extension, it connects Gemini CLI to Subtext's hosted MCP server and adds Subtext's skills for searching sessions, reviewing them and managing privacy rules. What you can do with it - Find sessions by what happened in them, such as reaching checkout and getting an error from the payment call, or list one user's recent sessions - Open a session, read its event map and zoom in on the moments that matter - Take a snapshot of what the user saw at any moment: a screenshot, the component tree and bounding boxes - Get a plain-language account of what happened, with a likely root cause - Scan a session for personal data, propose masking rules, test them in preview and promote them - Add URL and network capture rules How it connects First add Subtext's capture snippet to your web app so sessions are recorded; the setup wizard (npx @subtextdev/subtext-wizard) can do this for you. Then install the extension with gemini extensions install https://github.com/fullstorydev/subtext. It points Gemini CLI at https://api.fullstory.com/mcp/subtext, which you sign in to with OAuth, or with a Subtext API key sent as a bearer token. You need a Subtext account, which is free to start. Good to know - Form inputs are masked in the browser before anything is recorded, so your agent never sees what users typed into them. - Most tools only read. The privacy tools change your org's capture rules: element rules start in preview and reach every session only when you promote them, and the agent can't delete live rules. URL and network rules apply to all sessions as soon as they're created. - Reviewing sessions uses agent credits from your Subtext plan. - Session search covers page visits, custom events and failed network requests, not clicks or console messages. - Subtext is a Fullstory product, built on Fullstory's capture.
Once it’s added
“Check the session from the checkout failure this morning.”
Before you add it
Reads only
Recorded sessions: pages, clicks, console errors and network calls · Screenshots and the component tree at any moment · Your current privacy and capture rules
Makes changes · your agent can ask first
Creates masking rules in preview and promotes them to all sessions · Adds URL and network capture rules · Deletes preview rules, never live ones
From people who use it
Step by step
Nothing new reaches your agent until a person has looked at it.
Plugins people install alongside Subtext.
No reviews yet. Used Subtext? Say how it went.
Write a reviewRuns on your machine.
gemini extensions install https://github.com/fullstorydev/subtext
Scanned and passed · checked 8 h ago
Plugins people install alongside Subtext.
Lets your agent search, query and chart the data in your own Metabase, and build questions and dashboards with your permissions.
Equips your coding agent with a data engineer, pipeline commands and skills for Airflow, dbt, Spark and data quality.
Lets your agent query your PostHog analytics, triage errors, and create feature flags and experiments from plain-language asks.
Data analytics skills for product managers: SQL from plain English, cohort retention analysis and A/B test reads with a ship-or-stop call.
Nobody has shared how they use Subtext yet.
“Find sessions from the last 7 days that reached /checkout and got an error from checkout/pay.”
“What was the error users hit on the pricing page yesterday afternoon?”
“List my recent Subtext sessions.”
“Scan this session for PII and propose masking rules.”
“Show me every privacy rule that's active right now.”
Scanned on every change, and again when our rules improve.
Tell us and a person on the trust team will look at it. Or email [email protected].
Security scan
Passed
Safe to install in every agent it supports. Extensions.
