# Prompt Versions and Config Snapshots

> Every prompt save creates a version you can compare and restore, and agent config snapshots let you roll back the whole agent, including tools, data fields and call behaviour.

Source: https://edesy.in/docs/voice-agent/agent-setup/prompt-versions

Edesy keeps two kinds of history for each agent. **Prompt versions** record every change to the prompt, with a line-by-line diff and one-click restore. **Config snapshots** record the agent's whole configuration (tools, data fields, knowledge base links, call behaviour, outcomes and more) so you can roll back everything at once, not just the prompt.

## At a glance

| | Prompt versions | Config snapshots |
|---|---|---|
| What is saved | The prompt text | The full editable agent config |
| When | Each time the prompt changes | Automatically on update, manually, and before every restore |
| Compare | Diff against the previous or any earlier version | Labels and notes |
| Restore | Yes, with undo | Yes; a pre-restore snapshot is taken first |
| Where | Prompt editor → **History** | Agent → **History** tab |

## What a config snapshot covers

- Agent settings (model, voice, language, greeting and the rest)
- Functions and tools
- Data collection fields
- Knowledge base links
- Call behaviour (silence, interruptions, end-call rules)
- Outcome configuration and fallback rules
- Conversation flow
- ERP configuration
- Per-agent extraction templates

## Snapshot triggers

| Trigger | When it happens | Kept |
|---------|-----------------|------|
| Automatic | After you save a change. Identical configs are not saved twice | The latest 30 per agent |
| Manual | You click **Save a checkpoint**, optionally with a label and notes | Always |
| Pre-restore | Just before you restore another snapshot | Always, so you can undo the restore |

## Compare and restore a prompt version

1. Open the agent and go to the prompt editor.
2. Open **History**.
3. Pick a version. Switch between **Changes** (the diff) and **Full prompt**.
4. Use **Compare with** to diff against the previous version or any other version.
5. Click **Restore**. If you change your mind, click **Undo** in the confirmation.

## Restore a config snapshot

1. Open the agent and go to the **History** tab.
2. Find the snapshot by date, label or change note.
3. Click **Restore**. A pre-restore snapshot of the current state is saved first.
4. Place a test call to confirm the agent behaves as expected.

## FAQs

**Does restoring a prompt version change my tools?**
No. Prompt versions only cover the prompt. Use a config snapshot to roll back tools and other settings.

**Are evals linked to a version?**
Yes. Each eval run records the agent configuration and the prompt version it ran against. See [evals](https://edesy.in/docs/voice-agent/agent-setup/evals).

**Can I A/B test two prompts on live traffic?**
No. Compare prompts with evals and test calls, then restore or keep the version you prefer.

**Will a restore break my phone number or campaign links?**
Restores keep the same agent, so numbers and campaigns stay attached.

## Related

- [System prompt configuration](https://edesy.in/docs/voice-agent/agent-setup/system-prompt)
- [Evals and Test Center](https://edesy.in/docs/voice-agent/agent-setup/evals)
- [Copilot](https://edesy.in/docs/voice-agent/agent-setup/copilot)