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Ghostwriter

The agent-building agent

Build

Empower your customer experience teams to build agents, whatever their technical expertise.

  • Prompts, not clicks

    Build or modify agents by describing how you want them to behave. Update workflows, systems integrations, guardrails, tone, and style with simple prompts.

  • Build from what you have

    Upload SOPs, raw transcripts, or even audio interviews of subject matter experts to create customer journeys from scratch.

  • Complete transparency

    See exactly what Ghostwriter built before anything goes live so you can review, approve, and ship with confidence.

Test

Guarantee agent quality at every stage of development.

A screen showing the "Ghostwriter" AI tool building a retail support agent for Vintage Guitars, with tasks like "Updating agent", "Researching", "Creating tests", and "Running tests" visible.

  • Auto-generate simulations

    Ghostwriter proactively runs tests with every build or update, so each change is validated before it reaches you.

  • Built for edge cases

    Ghostwriter identifies and tests edge cases beyond the obvious scenarios, so your agent is ready for whatever customers throw at it.

  • Close the loop automatically

    When a simulation fails, Ghostwriter diagnoses the issue and implements the fix, so your agent keeps improving without manual debugging.

Improve

Continuously optimize your agent for better performance.

A white card displays 'Recommendations' with three points: 'Build empathetic support for cancellations, disputes, and refunds,' 'Add secure subscription management for plans and billing,' and 'Implement all three recommendations to strengthen the billing experience.' It also has 'Compare findings' and 'Show all conversations' buttons.

  • Scale your best interactions

    Feed Ghostwriter golden recordings or transcripts from your best support associates and Ghostwriter uses them to improve your agent.

  • Implement recommendations

    Explorer analyzes your customer conversations and proactively highlights improvements that can be implemented automatically.

  • Fix issues with a click

    Every filed issue has a ‘Fix with Ghostwriter’ button, so agent improvements are taken care of for you.

A white ghost icon inside a translucent pill shape on a dark, textured background.

Agents as a Service

Sierra is reimagining software for the agent era—where you simply describe the outcome, and intelligent agents build, execute, and continuously improve the work for you. Meet Ghostwriter, the agent that creates and optimizes other agents, turning your ideas into production-ready customer experiences without clicks, code, or complexity.

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Discover what Sierra can do for you

Find out how Sierra can help your business build better, more human customer experiences with AI.

Learn more