DeepSeek Harness plugin gray releases should never start with a batch update on the only runtime. Lock the current plugin combination first, validate the replacement in an isolated workspace or remote Mac, then move through loading, minimal tasks, permissions, persistence, and restart checks before switching production users.

This week’s action: freeze automatic updates, record the complete working combination, and create a second execution surface before testing the new plugin set.

01

Who should use this rollout plan

This guide is for platform engineers who maintain a shared DeepSeek Harness plugin inventory and need repeatable version control. It also fits developers shipping a dsh-plugin who must prove compatibility with the Host, Client, and configuration contract. Operators running long-lived agents can use it to avoid turning a plugin update into an outage.

DeepSeek Harness is still marked as a developer preview, and the official project warns that compatibility-breaking changes can occur. Its plugin architecture is powered by Cordis, which is also under active development with an unstable API. That makes a gray release a control process, not just a slower installation. (DeepSeek Harness README; Cordis project status)

02

Why direct updates create an unsafe runtime

A plugin name is not a rollback point. A working DeepSeek Harness environment is a combination of at least four layers:

  • The Harness revision or release tag.
  • The plugin source and exact resolved versions.
  • The dependency lock file and package manager behavior.
  • Configuration files, environment variables, credentials, workspace paths, and launch commands.

If only the plugin names are recorded, a rollback may reinstall a different dependency tree or start with a different configuration contract. The result can look like a successful downgrade while still failing during session restore or tool registration.

Three less visible risks deserve attention.

First, loading failure can happen before the agent becomes usable. A package can be present on disk but fail during discovery, registration, or Host and Client assembly. The official development guide separates Host and Client aggregates because the two sides expose different runtime surfaces. That means a package that passes one local check may still fail when the other aggregate or browser-facing path loads it. (DeepSeek Harness development guide)

Second, permissions can change without an obvious crash. A plugin update may register an additional tool, alter an approval path, or change a default capability. A session that starts normally can therefore have a larger action surface than before.

Third, restart behavior is not the same as task continuity. A process may restart cleanly while the original Agent task loses its session state, pending tool call, workspace lock, or continuation metadata. A green health check proves that the service came back. It does not prove that a long-running task can continue safely.

03

Phase 1: Freeze the known-good combination

Start by stopping update paths that cannot produce a complete rollback. This includes unattended package updates, floating Git references, unreviewed source pulls, and launch scripts that resolve a moving branch at startup.

Create a release record outside the active workspace. A simple shell capture is enough to begin:

mkdir -p release-records/known-good
node --version | tee release-records/known-good/node-version.txt
pnpm --version | tee release-records/known-good/pnpm-version.txt
git rev-parse HEAD | tee release-records/known-good/harness-revision.txt
git status --short | tee release-records/known-good/worktree-status.txt
cp package.json release-records/known-good/package.json
cp pnpm-lock.yaml release-records/known-good/pnpm-lock.yaml

The official development guide currently documents Node.js support beginning at 22.19, with CI coverage for Node 22.19, 24, and 26. It also states that the repository pins pnpm@11.7.0 in package.json. These are useful environment facts to capture, but they are not a permanent compatibility guarantee for every plugin. (DeepSeek Harness development guide)

Record the following items in the same release record:

  • Harness tag or commit.
  • Every plugin repository, package name, and source reference.
  • Resolved dependency tree and lock file.
  • Configuration file locations and launch commands.
  • Host-side and Client-side entry points.
  • Environment variable names, without copying secret values.
  • Workspace path and session storage location.
  • One read-only baseline task.
  • One reversible write task.
  • One restart and resume test result.

Do not copy production API keys into the validation environment. Preserve the variable names and permission shape, then substitute test credentials or a controlled endpoint.

Do teams need to lock plugin versions uniformly? They should lock the complete production combination, but that does not mean every developer branch must use the same version immediately. A shared production lane needs one approved lock file and one documented exception process. Development branches can test newer versions separately. Without that separation, “team standardization” becomes an accidental batch deployment.

04

Phase 2: Build a separate validation surface

The safest validation surface is a separate workspace on a second Mac. It can be local, but a remote Mac is often easier to isolate because the production machine does not need to be stopped or reconfigured.

Copy only what is necessary:

  • The same installation path logic.
  • The same startup method.
  • A sanitized configuration template.
  • A test workspace with disposable files.
  • Non-production credentials.
  • The same permission policy shape.

Do not copy real customer data, irreversible task queues, private tokens, or production hooks. The point is to reproduce the runtime contract, not the business payload.

If the team cannot run two environments in parallel, do not update the only execution surface. A temporary validation Mac is safer than a rushed in-place upgrade because it preserves an immediate fallback. NodeMini’s cloud Mac options can be used as a short-term second environment when a local spare Mac is unavailable.

The validation environment must use the same launch path as production. If production starts through a service wrapper, validate through that wrapper. If production uses a source checkout and a build step, do not validate with a different global package command. A different launch path can hide missing files, wrong environment variables, or stale compiled artifacts.

For source-based validation, the official project documents this basic sequence:

pnpm install
pnpm run typecheck
pnpm run build

The development guide says a fresh checkout is complete only after type checking succeeds, and it explains that a full build follows the Host and Client build order.

05

Phase 3: Validate loading and configuration contracts

The first test round should prove only that the replacement combination can load.

Do not begin with file writes, shell commands, external APIs, or customer-facing workflows. Start with these checks:

  • The plugin is discovered.
  • The package resolves from the intended source.
  • Configuration is found at the expected path.
  • Required values are accepted.
  • The Host starts.
  • The Client starts.
  • The runtime reports actual errors instead of hiding them behind a generic startup failure.

Capture logs from a clean process:

mkdir -p validation-logs
pnpm dsh --profile headless "summarize this test workspace" \
  2>&1 | tee validation-logs/load-and-start.log

Use only commands and profile names confirmed by the current project documentation. Do not invent configuration keys from a community plugin README. Verify each key against the current plugin source, the Harness configuration directory, or the official development documentation.

The current official README provides an npm entry point using npx @deepseek-ai/dsh web, with the Web UI served on 127.0.0.1:3080 by default. That gives maintainers a concrete startup check, but the port should still be read from the current deployment configuration rather than assumed in automation. (DeepSeek Harness README)

A successful round produces evidence such as:

plugin discovery: passed
configuration load: passed
host startup: passed
client startup: passed
unexpected errors: none

If the plugin is missing, configuration is rejected, or Host and Client disagree, stop here. The rollback action is to restore the known-good lock file, dependency tree, configuration snapshot, and startup artifacts as one unit.

06

Phase 4: Test the smallest useful capability

After loading succeeds, choose two deliberately small tasks:

  1. A read-only task that inspects a disposable workspace.
  2. A reversible write task that changes a temporary file and can be restored with one command.

The read-only task checks tool discovery and result serialization without creating external side effects. The reversible task checks approval handling, write boundaries, workspace resolution, and result return.

For example:

printf "before\n" > validation-workspace/state.txt

pnpm dsh --profile headless \
  "Read validation-workspace/state.txt and report its contents"

pnpm dsh --profile headless \
  "Append one test line to validation-workspace/state.txt, then report the file diff"

git -C validation-workspace diff -- state.txt

The exact command interface may vary by the installed Harness revision. The test design matters more than the literal prompt: keep the task small, observable, and reversible.

Compare the old and new capability lists. Record:

  • Tools present before and after.
  • Tools requiring approval.
  • Tools available without approval.
  • Workspace paths exposed.
  • Network or external service access.
  • Any new default capability.
  • Any change in error handling or result shape.

If the new plugin expands permissions, treat that as a separate change requiring explicit approval. Do not approve it implicitly because the package update also contains a bug fix.

The official architecture documentation describes a system in which plugin composition spans runtime services and interfaces rather than a single monolithic feature switch. That is why permission and capability diffs belong in the acceptance record. (DeepSeek Harness architecture documentation)

07

Gray-release acceptance matrix

Use the following matrix before moving any updated combination into a shared environment.

Release stage Entry condition Success evidence Rollback action
Known-good capture Current production run is reproducible Complete versions, lock file, config paths, and baseline task recorded Restore the captured combination
Load validation Isolated environment uses the production launch path Plugin discovery, config load, Host, and Client all pass Restore dependencies and configuration together
Minimal task Load round has no unexplained errors Read-only and reversible write tasks return expected results Disable the candidate environment
Permission review Tool list and approvals are captured No unexplained capability or approval expansion Reject candidate or require separate approval
Persistence and restart Previous rounds pass New session, saved state, process restart, and resume behavior are recorded Revert the full tested combination
First production batch Candidate has passed all prior rounds Low-risk users complete baseline tasks during observation Route the batch back to the old environment
Wider rollout First batch remains stable Shared tasks pass and no new errors appear Restore the last complete known-good set
08

Phase 5: Verify sessions, persistence, and restart

The third validation round focuses on state.

Run a fresh session, then run a second session using the same configuration. Stop and restart the process. Finally, test whether a deliberately paused task can continue. Keep these outcomes separate in the report:

  • New session starts.
  • Existing session can be opened.
  • Configuration persists.
  • Plugin state persists.
  • Process restarts.
  • Original task resumes.
  • Tool approvals remain consistent after restart.

A restart test can look like this:

pnpm dsh --profile headless "Create a resumable test task and stop after the first checkpoint"

# Stop the process using the normal service or supervisor command.
# Start it again through the production launch path.

pnpm dsh --profile headless "Open the previous test session and report its checkpoint"

Do not label the test “passed” merely because the second command starts. The success evidence must show that the intended session, workspace state, and task checkpoint are still available.

Only after these checks pass should the team test a longer-running Agent. Long tasks increase the cost of a bad candidate and make it harder to tell whether a failure comes from the plugin, session storage, model response, network, or process supervisor.

09

Phase 6: Switch remote Macs in batches

How should a remote Mac fleet update Harness plugins in batches? Treat each Mac or isolated workspace as a rollout unit. Begin with the lowest-risk task, keep the previous combination available, and expand only after the observation period produces clean evidence.

A sensible sequence is:

  1. Keep the production combination untouched on the primary lane.
  2. Install the candidate on one validation Mac.
  3. Run loading, minimal task, permission, persistence, and restart checks.
  4. Move one low-risk task or workspace to the candidate.
  5. Record logs, approvals, session behavior, and external side effects.
  6. Leave an observation window before adding another task.
  7. Move the next batch only if the previous batch remains clean.
  8. Update the release record with the responsible owner and next review condition.

For remote operations, preserve the old environment as a separate directory or machine whenever possible. Do not overwrite the only copy and assume that a package manager can reconstruct it later.

A remote Mac also introduces operational failure modes that local testing may miss:

  • SSH sessions can terminate while the Agent continues running.
  • VNC or browser access can fail even when the process is healthy.
  • Login-session environment variables may differ from shell variables.
  • Sleep, restart, or user-session changes can interrupt launch agents.
  • Network access can alter plugin behavior if tools call external services.

NodeMini’s remote Mac service overview can help teams plan a separate validation lane, while a cloud Mac Mini environment may be more suitable when the test must remain isolated from a developer’s daily workstation.

10

Whole-combination rollback

How can a failed dsh-plugin update be rolled back quickly? Roll back the complete tested combination, not only the package that appears in the error message.

If Harness, a plugin, and a dependency lock file changed together, downgrading only one package creates a new mixed state that was never validated. The rollback unit should include:

  • Harness tag or commit.
  • Plugin source references.
  • Lock file.
  • Built artifacts.
  • Configuration snapshot.
  • Startup script or service definition.
  • Session and workspace compatibility notes.

A controlled rollback sequence should be explicit:

git checkout <known-good-harness-revision>
cp release-records/known-good/package.json package.json
cp release-records/known-good/pnpm-lock.yaml pnpm-lock.yaml
pnpm install --frozen-lockfile
pnpm run typecheck
pnpm run build

Use the exact revision and commands recorded for the environment. If the previous setup used a package release rather than a source checkout, restore that release using its documented installation path instead of mixing installation methods.

The rollback is complete only when the old baseline task, permission behavior, session opening, and restart check work again. Save the failed candidate’s logs before cleanup; they may reveal a Host, Client, Cordis, or configuration contract change that needs a separate compatibility fix.

11

Current setup versus a Mac validation lane

A single local Mac is convenient, but it becomes a weak deployment surface when it is also the only place holding active sessions, credentials, workspaces, and plugin state. Direct in-place updates create three real disadvantages: there is no clean comparison environment, rollback can disturb running tasks, and local user-session settings may differ from the environment used by shared Agents.

A cloud VM can provide a second surface, but it may introduce a different operating system, different filesystem behavior, different desktop access, and a different runtime path from the Mac-based production setup. For plugin authors testing Mac-specific launch behavior, those differences can invalidate the result.

A separate NodeMini Mac environment is a better fit when the requirement is temporary validation, remote access, and a production-like Mac execution path without replacing a stable long-term machine. It is not the best choice for every workload: teams with sustained, predictable heavy usage may prefer owning dedicated hardware, while workflows requiring physical peripherals still need a local Mac. For a short-lived gray release, however, preserving the old combination while a second Mac proves the new one is usually safer than updating the only runtime.

The next action is straightforward: keep one known-good plugin set ready for immediate recovery, create the isolated validation surface, and do not widen the rollout until every stage has explicit success evidence and a recorded rollback command.