---
title: Versions tab
description: View the version history of an agent, including which versions are
  deployed per environment.
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---

Prefactor creates a [version](/platform/concepts/agent#versions) each time an instance arrives with a combination of metadata and schema it has not seen before for that agent. This tab lists all known versions and shows where each is currently deployed.

## Version history

A list of all known versions for the agent. Each entry shows the version identifier and when it was first registered. Each version also lists the environments it is currently deployed to, or "- not deployed -" if it has not been deployed anywhere.

Selecting a version opens its details panel.

## Version details

- **Version number** – the identifier used by your deployment system.
- **Schema version number** – the activity schema version associated with this code version.
- **Deployed environments** – the environments where this version is currently deployed.
- **Risk classification** – two scores when classification data is available: **Theoretical risk** (potential risk from the activity schema and action profile, calculated before any runs) and **Observed risk** (derived from spans recorded during actual executions). See [Risk profiles page](/admin-ui/risk-profiles) for how scores are computed.
- **Runtime environment** – SDK, runtime, and OS reported for this version, when the SDK records that data.
- **Registered** – when Prefactor first observed this version.


## Recent instances for this version

A table of recent instances that ran under the selected version. Columns: Instance ID, Environment, Status, Time, Version. A **View all** link opens a filtered instances view for this version.

## Related

- [Agent](/platform/concepts/agent#versions) — how Prefactor creates versions and what they represent.
- [Agent deployment](/platform/concepts/agent-deployment) — how a version is pinned to an environment.
- [Agent page](/admin-ui/agent) — the fixed strip above the tabs.
- [Agent page › Deployments tab](/admin-ui/agent/deployments) — deployment-scoped tokens tied to each environment.
- [Agent page › Activity schema tab](/admin-ui/agent/activity-schemas) — the schema version associated with each code version.