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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, system integrations, guardrails, tone and style with simple prompts.

  • Build from what you have

    Upload SOPs, raw transcripts or even audio interviews with 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.

  • Automatically 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 optimise 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

    Provide Ghostwriter with golden recordings or transcripts from your best support associates to improve your agent.

  • Implement recommendations

    Explorer analyses 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 handled 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 optimises 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