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effective(session) = findLast(the session own knob events)?.value ?? the composition-config default. One log-only event per knob, owned by its domain (bash/sandbox-mode in dsh-bash, approval/policy in dsh-approval), each exporting the same three-piece kit: the event declaration, a pure fold, and THE write path — a switch IS its event; no owner service, no facts map. Restart immunity and multi-session isolation fall out of the log replay by construction. Execution follows the fold on both sides: the bash tool stamps escalation grant > session override > executor default, and the approval seam prepends the never-gate that auto-rejects before any interactive answerer. Visibility is two layers per knob: a per-agent prompt section states the effective value on every request (logged through request/header*, so what-the-model-was-told replays from the log), and an agent/pre-step narrator injects at most one coalesced delta notice with positional attribution (user switch vs operator/config drift). The ACP bridge advertises one capability-gated select per composable knob with currentValue folded per session, validates set_config_option against the closed vocabularies, and anchors idle switches at the next turn prompt-submit under the turn-enclosure contract.
bash/ — bash capability family
The canonical three-package capability seam (see capability seams): an abstract executor interface, concrete implementations, and the model-facing tool that consumes it. All product packages.
| Package | Role | ctx key |
|---|---|---|
bash/ |
Abstract bash executor seam (interface + vocabulary; sandbox result facts carry the sandbox/ seam's mode/enforcement vocabulary) |
ctx.bash |
bash-local/ |
Local-subprocess BashExecutor implementation |
(registers ctx.bash) |
bash-sandbox/ |
Sandbox-consuming BashExecutor (wraps every command argv via ctx.sandbox, stamps denial/enforcement facts; extends bash-local's mechanics) |
(registers ctx.bash) |
tool-bash/ |
Model-facing bash/bash_output/bash_kill tool schemas |
(registers on ctx.tools) |
The interface lives at bash/bash/. bash-sandbox replacing bash-local without touching the interface or the tool is the split doing exactly what it exists for — a leaf cordis.yml picks one executor entry, plus a ctx.sandbox provider entry for the confined one (see examples/sandbox-acp-agent).