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Overview

Start a new milestone for an existing project. This is the brownfield equivalent of new-project, designed for projects that already have a PROJECT.md with history. The command guides you through questioning, optional research, requirements definition, and roadmap creation.

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Syntax

/gsd:new-milestone [milestone name]
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milestone name
string
The name for the new milestone (e.g., “v1.1 Notifications”, “v2.0 API Redesign”). If not provided, you’ll be prompted to enter it.

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Process

The command executes the new-milestone workflow which follows this cycle:
  1. Questioning - Gather information about what’s next for the project
  2. Research (optional) - Domain research for NEW features only
  3. Requirements - Define scoped requirements for this milestone
  4. Roadmap - Create phase structure (continues numbering from previous milestone)
  5. State Reset - Reset STATE.md for new milestone
The workflow includes validation gates and requires user approval at key decision points.

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Created/Updated Files

  • .planning/PROJECT.md - Updated with new milestone goals
  • .planning/research/ - Domain research files (optional, NEW features only)
  • .planning/REQUIREMENTS.md - Scoped requirements for this milestone
  • .planning/ROADMAP.md - Phase structure with continued numbering
  • .planning/STATE.md - Reset for new milestone

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Context Files Referenced

The workflow loads these references as needed:
  • questioning.md - Questioning framework
  • ui-brand.md - UI and brand guidelines
  • project.md template - Project structure template
  • requirements.md template - Requirements template

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Examples

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Start Milestone with Name

/gsd:new-milestone v1.1 Notifications
Starts a new milestone called “v1.1 Notifications” and begins the questioning phase.

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Start Milestone with Prompt

/gsd:new-milestone
Starts a new milestone and prompts you to enter the milestone name.

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Start Major Version

/gsd:new-milestone v2.0 Platform Redesign
Starts a major version milestone with significant changes.

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After Completion

Once the milestone is defined: 
/gsd:plan-phase [N]
Begin planning the first phase of the new milestone.

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Key Features

  • Continues Context: Builds on existing PROJECT.md history
  • Phase Numbering: Automatically continues phase numbers from previous milestone
  • Scoped Requirements: Creates fresh REQUIREMENTS.md for this milestone only
  • Optional Research: Only conducts research for genuinely new feature areas
  • Approval Gates: Requires confirmation at questioning, requirements, and roadmap stages

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Allowed Tools

  • Read
  • Write
  • Bash
  • Task
  • AskUserQuestion