---
type: Fixed
pr: 4472
---
**`/gsd:undo --phase` and `--plan` no longer select commits from an unreachable branch, and refuse rather than anchor on a directory an earlier milestone used** — commit selection now anchors on the target phase's own directory (the `#3995` `PHASE_START` pattern already used by `code-review.md`) and runs over `PHASE_START^..HEAD` instead of a repository-wide `git log --all` commit-subject grep. The dead `.planning/.phase-manifest.json` primary path, which nothing in the repository writes, is removed rather than left as documented-but-unreachable behaviour, and both modes now fail closed when no anchor resolves instead of widening to an unbounded search. Two refusals cover the previous-milestone routes the anchor cannot distinguish on its own: a phase number that resolves to an archived `milestones/v<X.Y>-phases/` directory, and a **live** directory whose name also exists as a directory under an archived milestone (a later milestone reusing both the number and the slug re-creates the same literal path, so the oldest add there is the earlier occupant's). The first: `find-phase`'s ambiguity check does not span search directories, so a number that is no longer live resolves silently to the oldest archived milestone that has one — and anchoring there both misses that phase's real work and drags a *later* milestone's same-numbered phase into the window. `dependency_check` reads the workstream-resolved planning root, so an active workstream's roadmap and phase directories are consulted rather than the root's. (#4465)