Sierra restructures the Agent Studio workflow around Ghostwriter
On November 2, 2026, Sierra announced a redesign of Agent Studio around its agent-building tool Ghostwriter, integrating troubleshooting, journey editing, and testing into a single conversation, with evidence, suggested changes, and test results kept together for teams to review before going live. Ghostwriter was launched on March 25, 2026, and initially could read SOPs, customer service call transcripts, photos of whiteboard sketches, process documents, recordings, and natural language instructions to identify key behaviors and edge cases; on September 28, 2026, it was expanded into a proactive collaborating member that resides in Slack and Teams. The new version supports maintaining context across journeys, simulations, and dashboards; each session is a chat thread containing conversation and changes, changes must be reviewed and merged, and sessions can be shared or forked; Agent Studio can also group related agents into the same project for unified testing and release, and offers line-by-line diffs, automated Agent Checks, peer review and a Reviewer role, staged releases, and rollback-capable immutable snapshots.
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