dsh-plugin-governance-gate

A DeepSeek Harness (dsh) approval answerer backed by the agent-governance sidecar: every dsh approval/request is decided by the deny-by-default gate, L0–L4 risk rules and the organizational audit chain — with human approvals happening in the sidecar console instead of (or in addition to) dsh's own UI.

Spike conclusions (spec mcp-governance-gateway, Phase I1)

Verified against the dsh source and docs on 2026-08-18:

• dsh's user-approval seam exposes a waterfall answerer event — 'approval/request'(req, next) where a listener claims the request by returning an ApprovalOutcome ('allowed-once' | 'rejected' | 'cancelled' | 'unavailable') or delegates via next(); the chain is fail-closed (missing/throwing answerers resolve 'unavailable', callers deny). Source: packages/interaction/user-approval/src/index.ts in the dsh repo.
• Plugins ship as npm packages with a dsh.bundle manifest (dsh: { bundle: { patch: "./cordis.patch.yml" } }), an ESM entry exporting name + apply(ctx), installed via dsh plugin add. Source: docs/user/develop/basic/publish.md.
• Semantic alignment is exact: our gate's allow / blocked / paused maps 1:1 onto allowed-once / rejected / wait-for-human. No degradation to a docs-only recipe was needed.

Known v1 limitation (by dsh design): ApprovalRequest deliberately omits tool arguments (they are linked via callId), so input-matching risk rules see only the call reference, not the rendered arguments.

Install (into a dsh profile)

# 1. run the governance sidecar (one command, zero config):
npx @agent-governance/sidecar          # or the single-container Docker image
# 2. add the answerer to your dsh profile:
dsh plugin add dsh-plugin-governance-gate
# 3. point it at the sidecar (default http://127.0.0.1:7899):
export GOVERNANCE_SIDECAR_URL=http://127.0.0.1:7899

Grant the dsh tool names at the gate (deny by default), e.g.:

SIDECAR_GATE_ALLOWED_TOOLS="bash,read,write" npx @agent-governance/sidecar

Behavior

| Gate verdict | dsh outcome | |---|---| | allow | allowed-once — dsh executes the tool locally | | blocked | rejected — the denial lands on the audit chain | | paused (L2/L3) | waits for the human in the sidecar console; approved → allowed-once, rejected → rejected | | sidecar unreachable / wait timeout | next() — dsh's own answerers stay in charge (still fail-closed); set GOVERNANCE_FAIL_CLOSED=1 to hard-reject instead |

Env knobs: GOVERNANCE_SIDECAR_URL, GOVERNANCE_POLL_MS (default 1000), GOVERNANCE_TIMEOUT_MS (default 600000), GOVERNANCE_FAIL_CLOSED.

Apache-2.0. Parent project: agent-governance.