wt merge

Merge current branch into the target branch. Squash & rebase, fast-forward the target branch, remove the worktree.

Unlike git merge, this merges the current branch into the target branch — not the target into current. Similar to clicking “Merge pull request” on GitHub, but locally. The target defaults to the default branch.

Examples

Merge to the default branch:

wt merge
◎ Running pre-merge project:test
  cargo nextest run
    Finished `test` profile [unoptimized + debuginfo] target(s) in 0.02s
     Summary [   0.002s] 2 tests run: 2 passed, 0 skipped
◎ Merging 1 commit to main @ a1b2c3d (no commit/squash/rebase needed)
  * a1b2c3d feat: add hook registration
   hook.rs | 31 +++++++++++++++++++++++++++++++
   1 file changed, 31 insertions(+)
✓ Merged to main (1 commit, 1 file, +31)
◎ Removing hooks worktree & branch in background (same commit as main, _)
○ Switched to worktree for main @ ~/repo

Merge to a different branch:

wt merge develop

Keep the worktree after merging:

wt merge --no-remove

Preserve commit history (no squash):

wt merge --no-squash

Create a merge commit — rebased semi-linear history by default:

wt merge --no-ff

Skip committing/squashing (rebase still runs unless —no-rebase):

wt merge --no-commit

Preserve the exact clean commit graph and tip:

wt merge --no-commit --no-rebase

Pipeline

wt merge runs these steps:

1. Commit — Pre-commit hooks run, then uncommitted changes are committed. Post-commit hooks run in background. Skipped when squashing (the default) — changes are staged during the squash step instead. With --no-squash, this is the only commit step.
2. Squash — Combines all commits since target into one (like GitHub’s “Squash and merge”). Use --stage to control what gets staged: all (default), tracked, or none. Working-tree changes swept into the squash are backed up first to refs/wt-backup/<branch>. With --no-squash, individual commits are preserved.
3. Rebase — Rebases onto target, skipping when nothing needs replaying (wt step rebase gives the conditions). A conflict stops the merge with the rebase left open in the worktree, to resolve or abort. With --no-rebase, the graph produced by earlier commit/squash steps is preserved and the target must be able to fast-forward to its tip.
4. Pre-merge hooks — Hooks run after rebase, before merge. Failures abort. See wt hook.
5. Merge — Fast-forward merge to the target branch (wt step push). With --no-ff, a merge commit is created instead — semi-linear history after the default rebase, while explicit --no-rebase preserves the graph produced by earlier steps before adding the merge commit. Non-fast-forward merges are rejected.
6. Pre-remove hooks — Hooks run before removing worktree. Failures abort.
7. Cleanup — Removes the worktree and branch. Use --no-remove to keep the worktree. When already on the target branch or in the primary worktree, the worktree is preserved.
8. Post-remove + post-merge hooks — Run in background after cleanup.

Use --no-commit to skip committing uncommitted changes and squashing; rebase still runs by default and can rewrite commits unless --no-rebase is passed. Combining both flags preserves the exact source graph and requires the target to be its ancestor. Useful after preparing commits manually with wt step commit. Requires a clean working tree.

wt merge targets the local default-branch ref and never fetches. When that ref lags its upstream — e.g. a primary checkout’s main left behind origin/main — a branch based on the newer upstream tip is measured, squashed, and rebased against the upstream (so already-upstream commits are never folded into the squash), and the final fast-forward carries the local ref through the already-fetched upstream commits by their real SHAs. wt step squash and wt step rebase measure the same way. A local target that has diverged from its upstream — its own commits and behind — cannot fast-forward, so the merge is refused until the target is reconciled.

Local CI

For personal projects, pre-merge hooks open up the possibility of a workflow with much faster iteration — an order of magnitude more small changes instead of fewer large ones.

Historically, ensuring tests ran before merging was difficult to enforce locally. Remote CI was valuable for the process as much as the checks: it guaranteed validation happened. wt merge brings that guarantee local.

The full workflow: start an agent (one of many) on a task, work elsewhere, return when it’s ready. Review the diff, run wt merge, move on. Pre-merge hooks validate before merging — if they pass, the branch goes to the default branch and the worktree cleans up.

[[pre-merge]]
test = "cargo test"
lint = "cargo clippy"

See also

• wt step — Run individual operations (commit, squash, rebase, push)
• wt remove — Remove worktrees without merging
• wt switch — Navigate to other worktrees

Command reference

wt merge - Merge current branch into the target branch
Squash & rebase, fast-forward the target branch, remove the worktree.
Usage: wt merge [OPTIONS] [TARGET]
Arguments:
[TARGET]
Target branch
Defaults to default branch.
Options:
--no-squash
Skip commit squashing
--no-commit
Skip commit and squash
--no-rebase
Skip rebase; require the target to fast-forward to the resulting tip
--no-remove
Keep worktree after merge
--no-ff
Create a merge commit (no fast-forward)
--stage <STAGE>
What to stage before committing [default: all]
Possible values:
- all:     Stage everything: untracked files + unstaged tracked changes
- tracked: Stage tracked changes only (like git add -u)
- none:    Stage nothing, commit only what's already in the index
-h, --help
Print help (see a summary with '-h')
Automation:
--no-hooks
Skip hooks
--format <FORMAT>
Output format
JSON prints structured result to stdout after merge completes.
[default: text]
[possible values: text, json]
Global Options:
-C <path>
Working directory for this command
--config <path>
User config file path
--config-set <toml>
Override config with inline TOML, e.g. --config-set list.full=true (repeatable)
-v, --verbose...
Verbose output (-v: info logs + hook/alias template variables on stderr; -vv: also debug
logs and raw subprocess output written to .git/wt/logs/). Set WORKTRUNK_VERBOSE=0|1|2 to
apply the same level everywhere — including shell completion, which no flag can reach
-y, --yes
Skip approval prompts