dsh-system-prompt

dsh-system-prompt is a read-only DeepSeek Harness plugin for inspecting the effective prompt of a live session.

Its only product behavior is session-scoped prompt inspection.

It owns two browser surfaces:

• conversation.view (order: 30): a session inspection tab showing prompt sections, runtime contexts, variables, tools, and producer-supplied messages.
• A Sections detail tab beside ui-trajectory's system-prompt tabs. It is a bounded DOM bridge because the upstream trajectory package does not expose a detail-tab slot.

The host exposes only session on /dsh-system-prompt. The endpoint accepts { sessionId }, reads the matching live agent, and returns a small JSON projection. It never serializes a live Context, Agent, Session, service, or Cordis object.

Screenshots

The screenshots show the Chinese 系统提示词 conversation tab and 组成部分 trajectory detail tab (English: System Prompt and Sections).

Conversation inspection	Trajectory system prompt details

Build

This package follows dsh-plugin-template's self-contained package shape:

npm run typecheck
npm run build

The host and declarations are emitted by tsdown. The browser half is then written as the Harness window.__ModuleLoader__ closure bundle.

Install the package into a profile with:

dsh plugin --profile web add github:elonnzhang/dsh-system-prompt

The repository commits its lib/ bundle, so this GitHub install does not need to execute a package build script or modify the profile allowBuilds list. The bundle also supplies the Web Connection's webServer injection required for plugin RPC channels; no separate profile-local RPC patch is needed. For local source development, run npm run build explicitly before testing.

Test with deepseek-harness

For source-level browser testing, link this checkout into the Harness web profile, then run the plugin watcher and Harness in separate terminals:

# in this repository
npm run dev

# in ../deepseek-harness
pnpm dsh plugin --profile web add link:/Users/elon/code-space/GitHub/dsh-system-prompt
pnpm dsh web --no-open --port 3080

Open the URL printed by dsh web (including its launch token on first visit); a bare http://127.0.0.1:3080 returns 401 without an existing browser session. The watcher rebuilds lib/ after changes under src/ or scripts/; refresh the Harness page when the browser bundle is reloaded. Verify both the conversation inspection view and the trajectory System Prompt / Tools / Sections detail flow. For a clean one-off check, npm test validates types, generated bundles, JavaScript syntax, the smoke contract, and host RPC runtime checks before starting Harness.

Provenance boundary

There is no ./invariant export: this plugin owns no independent mutable relationship outside Cordis effects to check.

Prompt, context, variable, and tool ownership is reported at global / preset / agent scope. The underlying registries do not retain the registering Fiber, so this plugin does not claim a more precise plugin-level owner.