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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).
DeepSeek Harness
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The DeepSeek Harness SDK is a plugin-based SDK for building agent harnesses.
Development
This monorepo is built on the Cordis framework (vendored as source under vendor/), microkernel-style: everything is a plugin.
pnpm install
pnpm run test # vitest
pnpm run demo:repl # REPL agent demo (needs DEEPSEEK_API_KEY)
pnpm run demo:acp # ACP server agent demo (needs DEEPSEEK_API_KEY)
For humans, start with the development guide for local setup, hooks, environment variables, and quality gates, then read the architecture design and documentation graph index before package work. Local context lives in packages/ and vendor/.
For agents, follow AGENTS.md.