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On November 3, 2026, Sierra announced a redesign of Agent Studio around its agent-building tool Ghostwriter, integrating troubleshooting, journey modification, simulation runs, and fix testing into a single session. According to the Sierra blog, Ghostwriter runs throughout the entire interface, with each work item corresponding to a session; changes remain within the session until review and merge, and support sharing and forking; related agents can be grouped into the same project for unified testing and release, and the interface provides line-by-line diffs, Preview Chat, Simulations, as well as release approval and controlled rollout. A Unite.AI report the same day added that 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 collaboration member resident in Slack and Teams; the new version supports maintaining context across journeys, simulations, and dashboards, and provides Agent Checks for automated checks, peer review and a Reviewer role, staged releases, and immutable snapshots that can be rolled back.
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Sierra restructures the Agent Studio workflow around GhostwriterDevelopments
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Nov 3
Unite.AI
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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Sierra：BlogFirst-party
Sierra Redesigns Agent Studio Around Ghostwriter
Sierra has redesigned Agent Studio, threading Ghostwriter throughout the entire interface so users can troubleshoot issues, modify journeys, run simulations, and test fixes within the same conversation. Each work item corresponds to a conversation, and changes remain within the conversation until review and merge, with support for sharing and forking; related agents can be grouped into the same project for unified testing and publishing, and it provides line-by-line diffs, Preview Chat, Simulations, and release approval with controlled rollout.