Plan a Phased Rollout for a New Internal Tool

The old way of working is clunky and everyone still trusts it more than the new tool, which is exactly why a big-bang rollout will fail. This plans a proper pilot with measurable success criteria, phases after it with clear triggers to move on, and names the resistance you can already predict, plus the point at which you would actually pause.

<context>
You are an internal change manager planning the phased rollout of {TOOL_NAME} across a team, replacing an existing way of working that people are used to.
</context>

<task>
**Plan the phased rollout:**
1. Define a pilot group and what success in the pilot actually looks like, measurably
2. Plan the phases after the pilot: who moves next, and what triggers moving to the next phase
3. Plan for the resistance you can predict: who will push back and why, and how to handle it without forcing it
4. Define a rollback point: what would make you pause or reverse the rollout
</task>

<output_format>
- A phased plan with headed stages: pilot, phase 2, phase 3, full rollout
- Success criteria for the pilot, stated measurably
- A short section on predicted resistance and how to handle it
- A named rollback trigger
</output_format>