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enableRunInBackground: false removed the parameter from the advertised schema only — the arg validator deliberately allows undeclared keys, so a caller (or a model that has seen the parameter elsewhere) could still force run_in_background: true and start background work past the deployment's opt-out, in both tool-bash and tool-subagent. Both producers now refuse the forced key loud in execute(); tests pin the refusal (and that nothing spawns) alongside the untouched foreground path; the schema-omission-is-advertising rule is recorded in the runtime RFC and both READMEs.
bash/ — bash capability family
The canonical three-package capability seam (see capability seams): an abstract executor interface, a concrete local implementation, and the model-facing tool that consumes it. All product packages.
| Package | Role | ctx key |
|---|---|---|
bash/ |
Abstract bash executor seam (interface + vocabulary) | ctx.bash |
bash-local/ |
Local-subprocess BashExecutor implementation |
(registers ctx.bash) |
tool-bash/ |
Model-facing bash tool schema |
(registers on ctx.tools) |
The interface lives at bash/bash/. A sandboxed executor would replace bash-local without touching the interface or the tool — the split is what makes that possible. Background runs are generic tasks, not bash-private state: tool-bash registers a started BashProcess handle with the ctx.tasks registry, whose task_* tools collect and stop it.