dsh-policy-drift-proof

Read-only, content-addressed policy/configuration drift evidence for DeepSeek Harness.

This plugin does not enforce tool calls, approve actions, scan repositories, or repair configuration. dsh-tool-policy already provides pre-execution policy routing, while SecurStack provides security scans and policy gates. This plugin covers the missing evidence question: did the policy snapshot actually observed by an operator differ from the pinned baseline, and was the difference weakening, tightening, exact, or unclassified?

Evidence model

The explicit manifest pins a baseline and observed policy-snapshot/v1 by SHA-256 and revision. Rules cover declared JSON Pointer roots:

• ordered-not-weaker: enum order is restrictive to permissive; moving right fails.
• set-no-additions: additions fail, removals are recorded as tightening.
• exact: any change fails.
• any changed covered leaf without a rule fails closed as UNCLASSIFIED_DRIFT.

Reports include paths, classifications and SHA-256 digests only. They never include policy values. Secret-shaped fields, raw output fields, absolute/escaping paths, symlinks, oversized inputs and excessive structure are rejected. The verifier performs no network calls or child processes and writes only one content-addressed JSON report beneath the explicit artifactDir, then reads it back and verifies its digest.

verified means both snapshot hashes and revisions matched and no weakening, exact or unclassified violation was found. Tightening remains observable through driftStatus: "changed". This is evidence about supplied snapshots, not a security certification.

CLI

node bin/dsh-policy-drift-proof.mjs inspect \
  --workspace examples/basic \
  --manifest policy-drift.manifest.json

node bin/dsh-policy-drift-proof.mjs verify \
  --workspace examples/basic \
  --manifest policy-drift.manifest.json \
  --artifactDir artifacts

The CLI prints one JSON object to stdout. A drift violation exits 2; invalid usage exits 1.

DeepSeek Harness bundle

dsh plugin --profile policy-proof add github:dongsheng123132/dsh-policy-drift-proof#<commit>
dsh profile --profile policy-proof compose

The bundle registers:

• dsh_policy_drift_inspect
• dsh_policy_drift_verify

The companion stdio MCP server exposes policy_drift_inspect and policy_drift_verify through .mcp.json.

Verification

npm test
npm run check
npm run smoke:mcp
python C:/Users/ZhuanZ/.codex/skills/.system/plugin-creator/scripts/validate_plugin.py .

CI runs tests, structural checks and MCP smoke on Ubuntu and Windows. Node.js 22 or newer is required.

License

MIT