specpi-experiments
Bounded detached Git worktree experiments for Pi: try an idea in an isolated worktree, export it as a patch, or discard it
Package details
Install specpi-experiments from npm and Pi will load the resources declared by the package manifest.
$ pi install npm:specpi-experiments- Package
specpi-experiments- Version
0.1.0- Published
- Sep 16, 2026
- Downloads
- 2,207/mo · 210/wk
- Author
- tannermidd
- License
- MIT
- Types
- extension
- Size
- 55.2 KB
- Dependencies
- 0 dependencies · 1 peer
Pi manifest JSON
{
"extensions": [
"./src/index.ts"
]
}Security note
Pi packages can execute code and influence agent behavior. Review the source before installing third-party packages.
README
specpi-experiments
Bounded detached Git worktree experiments for Pi. Try an idea in an isolated worktree, then export it as a patch or discard it — without ever touching the worktree you are working in.
Install
pi package add npm:specpi-experiments@0.1.0Pi supplies every runtime import. The package has no production dependencies.
Why
"Let me just try something" usually means editing the working tree and hoping you can get back. An experiment instead gets its own detached worktree at the current HEAD, so the base worktree, its index, and its uncommitted changes are never in play. When the experiment answers its question, you export a patch or throw the whole thing away.
Use
/experiment start [name]Opens an editor with an experiment card — name, hypothesis, acceptance, non-goals. If a task contract is present in the session it prefills the card; otherwise the card starts blank. Confirming creates a detached worktree from HEAD and reports its path. Open a separate Pi session in that directory to do the work — the experiment is a place to work, not a background agent.
| Command | Effect |
|---|---|
/experiment start [name] |
Write a card and create a detached worktree at HEAD |
/experiment status [id] |
Changed, committed, untracked and ignored path counts, plus the acceptance you wrote |
/experiment close [id] |
Export a patch or discard the worktree and its record |
/experiment recover |
Reconcile records against what Git actually tracks |
Experiments live under <pi-agent-dir>/specpi/experiments/, in a registry guarded by a lock file, with worktrees in a private directory. At most 32 are retained.
Starting dirty
If the base worktree has uncommitted changes, start says so and asks before continuing. Those changes stay where they are: the experiment starts from HEAD, so dirty paths are not copied into it.
Closing
close offers a patch export or a discard. Export writes a patch of the experiment's work; it refuses to replace an existing destination or follow a symlink, including one that appears between the check and the write. Discard removes the worktree and its record. Ignored paths are reported by status but are not exportable — a patch will not carry them.
Recovery
Worktrees outlive processes. recover walks the registry against git worktree list and offers, per finding, to activate a record Git still tracks, forget a record whose worktree is gone, or release a record while leaving an orphan directory in place for you to inspect. It never deletes a directory Git still tracks.
Boundaries worth knowing
An experiment worktree is an ordinary directory on your disk, with your permissions — isolation is from your base worktree, not from your machine. Only one experiment operation runs at a time, because git worktree is not safe to run concurrently against one repository. Git reports paths verbatim, so path labels are percent-encoded before display; a filename containing a newline cannot forge a line of output.
SECURITY.md states the full boundary.
License
MIT