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Charlie is the AI assistant inside telli. You tell Charlie what you’d like to change, it drafts the edit, and you decide what to keep. You’ll find Charlie in the chat panel on the left of the Builder. Anything you might ask a human prompt writer to do, you can ask Charlie. New to Charlie? The Get Started tutorial walks you through your first session step by step. This cookbook goes deeper: what Charlie can do in each area, how to phrase requests, and when to edit directly instead.

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What Charlie can help with

Charlie can help across multiple areas of your agent.
Tell Charlie what to change in the agent’s prompt and it drafts the edit for you.
  • Rewrite or restructure a specific section
  • Apply a tone change across the whole prompt, like making the agent friendlier or more confident
  • Insert the right variable or tool reference without having to look up the syntax
  • Adapt the prompt based on a transcript or example you share

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How to talk to Charlie

Charlie understands both specific instructions and general feedback. Use whichever fits the change you have in mind.
Useful when you know exactly what you want changed.
“Shorten the greeting and add a goodbye line at the end.”
“Replace the word ‘reservation’ with ‘booking’ everywhere in the prompt.”
“Add a step asking the caller for their order number before transferring.”
If you’re not happy with what Charlie did, reject the edits and try again with a clearer instruction. You can also roll back to a checkpoint to get back to a previous version.

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When to use Charlie vs edit directly

Charlie isn’t a replacement for editing the prompt by hand. Some changes are faster to do yourself.

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Best practices

  • Bring real call transcripts into the chat so Charlie can refine the agent based on conversations that actually happened, not just imagined cases.
  • Use checkpoints when experimenting. It’s faster to roll back than to manually undo a stack of changes.
  • Accept changes a few at a time if you’re not sure about all of them. Reject the rest and ask Charlie to try again with more guidance.
  • Start with Charlie on new prompts. Have it draft a structure for you, then refine the details by hand.

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Good to know

  • Charlie’s edits appear as inline diffs — accept or reject each one on its own, or apply them all at once. Checkpoints are created automatically, so you can roll back to any earlier state in one click.
  • The chat accepts file uploads (a transcript, a script document, a sample message) and voice input for longer instructions.
  • Charlie never publishes your agent. Changes stay as a draft until you click Publish.
  • Charlie can also access and edit other agents if you ask it to. This is great for applying changes to multiple agents at once
  • The chat remembers what you said earlier in the same session, so you can keep iterating without re-explaining context.