dsh-workspace-switch

Per-workspace activation control for DeepSeek Harness: each workspace decides which plugins, MCP servers, and skills its sessions may use, and a dialog on the workspace row edits that decision.

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What it does

Two halves, one plugin:

• Host half (index.js, built to lib/index.js) reads the per-workspace configuration when an Agent is created and applies it to that Agent's own Cordis scope, so two Agents in two workspaces inside one harness process see different capabilities:
  • a disabled skill is shadowed in that scope by a same-name non-invocable registration, which removes it from the model's skill catalog;
  • a disabled MCP server has every mcp__<serverName>__* tool denied in that scope;
  • a disabled plugin has the tool names its entry declares denied in that scope. The same half serves the configuration routes the dialog uses.
• Browser half (src/client/, built to lib/client.js) adds one row to a workspace's ... menu. It opens a dialog listing what the running composition offers under each category, with a switch per capability.

A workspace with no entry inherits the deployment's composition unchanged, so the plugin changes nothing until a workspace is configured.

Configuration

Two sources describe one workspace, in increasing precedence:

1. <DSH_HOME>/workspace-switch.json, whose workspaces map is keyed by workspace directory;
2. <workspace>/.dsh/workspace-switch.json, which replaces the shared entry for that workspace when it exists.

{
  "workspaces": {
    "E:\\my_project\\godot-game": {
      "plugins": { "mcp-godot-ai": { "enabled": false, "tools": ["mcp__godot-ai__run"] } },
      "mcp": { "godot-ai": { "enabled": false } },
      "skills": { "godot-scene-authoring": { "enabled": false } }
    }
  }
}

enabled: false switches a capability off for that workspace; an absent entry means enabled. A plugin entry also declares the tool names the plugin registers — the gate denies tools by name, so a plugin without tools has nothing to deny.

The dialog writes the document that currently answers for the workspace: the project file while one exists, the shared store otherwise. Output is published through a temp-file rename, so a reader never sees a half-written document.

Install

The plugin is a DSH bundle: add it to a profile and select it.

dsh plugin add link:/path/to/dsh_workspace_switch

then add dsh-workspace-switch to the profile's dsh.profile.bundles. A new bundle row loads at the next harness start.

Build

The browser half is a DSH client bundle and must be built; the repository toolchain is required (the plugin vendors its copy of the client build preset at scripts/tsdown.client.ts, which resolves the harness sources from the checkout it sits in).

# from a deepseek-harness checkout
pnpm exec tsdown --config dsh_workspace_switch/tsdown.config.ts   # or, inside the plugin: pnpm build
pnpm exec tsc -p dsh_workspace_switch/tsconfig.typecheck.json     # typecheck the browser half
node --test "tests/**/*.test.js"                                  # unit tests

lib/ is committed. The package's main and ./client both point into it, and a clone has neither the harness sources nor a build toolchain, so a build-from-source install (dsh plugin add github:…) would otherwise install a package with no entry points. Commit the rebuilt files with any change that alters them.

A standalone clone cannot run the build: the vendored preset imports the harness sources (../../packages/…, ../../scripts/…) that only exist inside a checkout. Build inside the checkout, then commit lib/ here.

Known limitations

• Skills are gated, not unloaded — a disabled skill keeps its files on disk; only its catalog entry and loading are removed for that workspace.
• A plugin needs declared tools — the gate denies tools by name, so switching a plugin off only removes what its entry names in tools.
• The dialog lists what the Host can address — plugin rows come from the profile's plugin manager (or the read-only inventory); a capability the composition does not expose cannot be configured.

Licence

MIT.