DeepSeek Harness Plugin Template

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A self-contained standalone repository template for an ESM Cordis plugin targeting DeepSeek Harness 0.2.1-rc.2. Every source file, compiler setting, test fixture, contributor instruction, skill, and build helper used by the repository lives below this root. A DSH host is a runtime consumer of the finished package, not a development input.

Documentation map

Need	Read
Contract rules: plugin forms, manifest, dependencies, display, lifecycle, composition, client, distribution	docs/dsh-plugin-contracts.md
End-to-end workflow and stage routing	.agents/skills/dsh-plugin-development/SKILL.md
Source, test, and patch layout	src/LAYOUT.md, tests/LAYOUT.md, patches/LAYOUT.md
Commands, CI, and release flow	this README and .github/workflows

Repository layout

.
├── .agents/skills/               # Repository-local plugin development workflow
│   ├── dsh-plugin-development/   # End-to-end coordinator
│   └── dsh-plugin-*/             # Stage skills
├── docs/
│   └── dsh-plugin-contracts.md   # Authoritative package and integration contract
├── patches/
│   └── LAYOUT.md                 # Dependency and DSH-host patch contract
├── scripts/
│   ├── extract-patch.mjs         # Host patch regeneration
│   └── patch.sh                  # Idempotent host patch application
├── src/
│   ├── assets/
│   │   ├── icon.svg              # Plugin icon exported through `./icon`
│   │   └── locale/
│   │       ├── en.json           # Display metadata
│   │       └── zh.json
│   ├── LAYOUT.md                 # Growth rules for source modules
│   ├── config.ts                 # Schemastery schema and defaults
│   ├── index.ts                  # Loader-facing function-plugin namespace
│   └── runtime.ts                # Host boundary and activation
├── tests/
│   ├── LAYOUT.md                 # Test conventions
│   ├── harness.ts                # Shared real-Cordis mount
│   ├── plugin.test.ts            # Loader and activation tests
│   └── snapshots/
│       └── LAYOUT.md             # Optional visible-output fixtures
├── .oxlintrc.json                # Type-aware Oxlint configuration
├── AGENTS.md                     # Contributor standing orders and navigation
├── cordis.patch.yml              # Profile bundle contribution
├── package.json                  # Exports, peers, engines, bundle metadata
├── pnpm-lock.yaml                # Reproducible dependency graph
├── pnpm-workspace.yaml           # Package-manager policy
├── tsconfig.json                 # Compiler and type-aware lint project
├── tsdown.config.ts              # Source-to-runtime/declaration build
└── vitest.config.ts              # Test runner configuration

Package contract

docs/dsh-plugin-contracts.md owns the full contract. The orientation points are:

• A function plugin exports name, inject, Config, and apply as one ESM namespace and has no default export.
• engines.node is >=24.0.0; engines.dsh declares the supported DSH range; dsh.manifestVersion and dsh.bundle.patch describe the public bundle layer.
• Display metadata reaches Plugin Manager through the exported ./locale/*.json and ./icon resources. This template stores their physical files under src/assets/ and lists them in files.
• @deepseek-ai/cordis and @deepseek-ai/schemastery are host-supplied peers, duplicated in devDependencies for local checks. See dependencies.
• A browser face declares dsh.client and exports its built bundle at ./client.

Create your plugin

1. Replace package identity in package.json, the Loader owner, configuration/runtime owners, focused tests, bundle metadata, TypeScript metadata, both READMEs, AGENTS.md, and src/assets/.
2. Choose the exact npm package name. It may be scoped or unscoped; do not assume the template's @your-scope/dsh- prefix. Replace it only in identity owners, never globally inside .agents/skills/.
3. Set engines.dsh to the range you support. Keep engines.node at Node 24 LTS or newer unless a different host contract is deliberate.
4. Update keywords, LICENSE, cordis.patch.yml, and the display title, description, and icon.
5. Add only the DSH host services the implementation uses. Apply dependencies when placing each package.
6. Implement activation and host-boundary behavior in the runtime/service owners, keeping registrations fiber-owned and disposing them in tests.
7. Keep every source, compiler, documentation, and project-reference path inside this repository. Do not add link: or file: dependencies.
8. Set private to false only when the package's public dependencies and distribution artifacts are ready.

Do not add a default export to a function plugin. Cordis Loader unwraps exports.default ?? exports; a stray default export discards inject, Config, and apply.

Bundled development skills

Start with dsh-plugin-development for the complete sequence, or invoke one stage directly:

Skill	Purpose
plan	Decide form, dependencies, configuration, compatibility, display, composition, evidence, and distribution.
scaffold	Instantiate and baseline-verify a new repository from this template.
align	Migrate an existing repository to this toolchain without changing behavior.
implement	Implement lifecycle-safe behavior, configuration, metadata, docs, and tests.
client	Add a dsh.client browser face, slots, settings forms, and ModuleLoader checks.
i18n	Localize browser UI with typed dictionaries and disposal evidence.
compose	Install the bundle into a profile and prove activation and compatibility.
test	Select the smallest evidence for Loader, behavior, disposal, composition, and artifacts.
release	Check packed, Git, or npm release readiness without publishing.

Keep these directories when copying the template.

Independent development

Run from this repository root:

pnpm install
pnpm run lint
pnpm test
pnpm run build
pnpm pack --dry-run --json

lint is the type-aware static-analysis gate. test uses the Vitest forks pool; a restricted host that rejects child-process forks can run vitest run --pool=threads locally. build emits the ready-to-pack lib/ runtime and declarations without an install-time build.

CI

• ci.yml: frozen install, lint, tests, and build on pushes to main and pull requests.
• release.yml: the same checks, then packs the tarball and publishes it to the version's GitHub Release.

Profile activation

Install through the plugin channel:

dsh plugin --profile <profile> add <package-or-tarball>

Profile startup checks engines.dsh, applies dsh.bundle.patch in bundle order, and reads display metadata without activating the plugin. See manifest and compatibility and bundle composition.

Plugin forms

export const name = 'plugin-template'
export const inject: string[] = []
export { Config } from './config.ts'
export { apply } from './runtime.ts'

// src/config.ts
import Schema from '@deepseek-ai/schemastery'
export interface PluginConfig { /* serializable fields */ }
export const Config: Schema<PluginConfig> = Schema.object({ /* validation and defaults */ })

// src/runtime.ts
export function apply(ctx: Context, config: PluginConfig): void { /* effects */ }

Config is the schema value Cordis Loader validates; PluginConfig is the public TypeScript shape. Keeping the names distinct avoids the declaration-merge false positive in no-redeclare. A service provider instead default-exports its Service subclass; do not mix the two forms.

Distribution

Build before packing and inspect the archive:

pnpm run build
pnpm pack --dry-run --json

The archive must contain every file promised by main, types, exports, and files, plus the bundle patch and the physical display assets. See build and distribution. Git installs fetch sources; only add a self-contained prepare build when you deliberately distribute that way and document the consumer's build-script approval.

Testing

The baseline tests prove Loader-safe ESM exports and schema-resolved activation. Replace the activation assertions with observable behavior and disposal assertions for every registry contribution. Product-visible plugins also need a real Loader/profile composition test in the consuming DSH application; see tests/LAYOUT.md and evidence.