## Thinking Path
> - Paperclip is the open source app people use to manage AI agents for
work.
> - Agents can run in isolated worktrees with a separate Paperclip
runtime.
> - Runtime provisioning uses a Bash script on macOS hosts.
> - macOS ships Bash 3.2, where an empty array expansion fails under
`set -u`.
> - The source-config argument array is empty when the base workspace
already has a config.
> - This pull request guards that expansion and tests the normal
base-config path on Bash 3.2.
> - The benefit is that managed worktree provisioning no longer fails
before database seeding.
## Linked Issues or Issue Description
No public GitHub issue exists for this problem. PR #11752 added the
conditional source-config argument that exposed the failure.
**What happened?**
`scripts/provision-worktree-runtime.sh` expands an empty
`source_config_args` array while `set -u` is active. Bash 3.2 reports
`source_config_args[@]: unbound variable` and stops provisioning when
the registered base workspace already has `.paperclip/config.json`.
**Expected behavior**
Runtime provisioning must call `worktree ensure-seeded` without a source
override when the base workspace config exists. It must work with the
Bash 3.2 version that macOS supplies.
**Steps to reproduce**
1. Use macOS system Bash 3.2.
2. Create a base workspace with `.paperclip/config.json`.
3. Run `scripts/provision-worktree-runtime.sh` with `set -u` active in
the script.
4. Observe the unbound-variable error before `worktree ensure-seeded`
runs.
**Paperclip version or commit**
Reproduced on `origin/master` before this change.
**Deployment mode**
Local managed worktree runtime on macOS.
## What Changed
- Guard all three optional source-config array expansions with Bash
3.2-compatible parameter expansion.
- Add a regression test that uses the base-config path and verifies that
no `--from-config` argument is sent.
- Document the Bash 3.2 compatibility requirement in the runtime script.
## Verification
- `/bin/bash -n scripts/provision-worktree-runtime.sh`
- `node --test --test-name-pattern='runtime provisioning invokes
ensure-seeded once|runtime provisioning omits the source
override|runtime provisioning guards every optional source-config
expansion' scripts/__tests__/provision-worktree-self-heal.test.mjs`
- `git diff --check`
## Risks
Low risk. The change only affects expansion of an optional two-element
CLI argument array. The regression tests cover both the empty and
non-empty paths.
> For core feature work, check [`ROADMAP.md`](ROADMAP.md) first and
discuss it in `#dev` before opening the PR. Feature PRs that overlap
with planned core work may need to be redirected — check the roadmap
first. See `CONTRIBUTING.md`.
## Model Used
OpenAI Codex with model ID `gpt-5`. The runtime did not expose the
context-window size. Reasoning, tool use, and code execution were
enabled.
## Checklist
- [x] I have included a thinking path that traces from project context
to this change
- [x] I have specified the model used (with version and capability
details)
- [x] I have checked ROADMAP.md and confirmed this PR does not duplicate
planned core work
- [x] I have searched GitHub for duplicate or related PRs and linked
them above
- [x] I have either (a) linked existing issues with `Fixes: #` / `Closes
#` / `Refs #` OR (b) described the issue in-PR following the relevant
issue template
- [x] I have not referenced internal/instance-local Paperclip issues or
links (only public GitHub `#NNN` / `github.com/paperclipai/paperclip`
URLs)
- [x] My branch name describes the change (e.g. `docs/...`, `fix/...`)
and contains no internal Paperclip ticket id or instance-derived details
- [x] I have run tests locally and they pass
- [x] I have added or updated tests where applicable
- [x] I have updated relevant documentation to reflect my changes
- [x] I have considered and documented any risks above
- [x] All Paperclip CI gates are green
- [x] Greptile is 5/5 with no open P2s, recommendations, or follow-ups
- [x] I will address all Greptile and reviewer comments before
requesting merge
---------
Co-authored-by: Paperclip <noreply@paperclip.ing>
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