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feat(mode): the access cap — plan mode composes with the sandbox instead of banning bash

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A ModeDefinition may declare access: the widest sandbox access shell
commands run under while the mode holds, on the SANDBOX_MODES ladder.
The bash seam gains the resolution point to hang it on: BashExecutor.
resolveMode(session) folds override ?? default and dispatches the new
bash/resolve-mode waterfall; dsh-tool-bash consults it at both the
stamping site and the escalation baseline; dsh-mode's clamp listener
takes the ladder minimum per call. Two independent log folds compose at
read time — the mode never writes the sandbox knob, so the two switch
in any order and the knob re-emerges intact on exit.

The built-in plan definition ships access: read-only with the bash trio
allowlisted CONDITIONALLY: both policy layers admit bash/bash_output/
bash_kill only while a confining executor is mounted (an unconfinable
shell cannot honor the cap), and a bash call carrying sandbox_permissions
under a cap is denied at the gate — no widening mid-mode; the widened
step belongs in the plan.

examples/plan-acp-agent swaps bash-local for sandbox-local +
bash-sandbox (workspace-write default, clamped read-only inside plan)
plus the approval seam; the re-recorded plan-mode arc runs a real cat
inside plan under the clamped sandbox, and modes-advertise now pins the
sandbox-mode and approval config options. RFC amended to the landed
shape (access cap section, orthogonality FAQ, deferred item resolved
into effects self-declaration).
This commit is contained in:
kingwl
2026-07-12 22:51:09 +08:00
parent 88db403d9f
commit 99650a201b
31 changed files with 1844 additions and 1237 deletions
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4
docs/persistence-catalog.md
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@@ -81,7 +81,7 @@ The session's sandbox mode was switched — log-only (like `approval/*`; NOT a s
'bash/sandbox-mode': { mode: SandboxMode }
```
Source: [`packages/bash/bash/src/session-mode.ts:31`](../packages/bash/bash/src/session-mode.ts)
Source: [`packages/bash/bash/src/session-mode.ts:34`](../packages/bash/bash/src/session-mode.ts)
### `compact/*`
@@ -163,7 +163,7 @@ The session mode in force from this point on: log-only, non-surface, whole-value
'mode/set': { mode: string }
```
Source: [`packages/mode/mode/src/index.ts:41`](../packages/mode/mode/src/index.ts)
Source: [`packages/mode/mode/src/index.ts:49`](../packages/mode/mode/src/index.ts)
### `prompt/*`