Remotion Video Plugin for DeepSeek Harness

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Give DeepSeek Harness a structured Remotion workflow and five workspace-confined tools for diagnosing projects, discovering compositions, rendering stills and videos, and verifying output metadata.

Watch the 12-second MP4 · Reproduce the proof

Install

After 0.4.0 is published to npm, install the immutable version into the DeepSeek Harness Web profile:

dsh plugin --profile web add @chenjie1129/dsh-remotion-video-plugin@0.4.0
dsh web

Until npm publication is verified, use the pinned GitHub release tag:

dsh plugin --profile web add github:chenjie1129/remotion-video-plugin#v0.4.0
dsh web

Start a standard-agent session and ask:

Create a 15-second 16:9 product-launch video. Diagnose the project, use frame-driven animation, render a representative still, then render and verify the MP4.

What version 0.4 includes

• A user- and model-invocable remotion-video skill with eight focused rule modules.
• Product-launch, vertical-captioned, and data-story blueprints.
• Ten bilingual model-to-render evaluation cases.
• Five tools registered through the real Harness tool and managed-subprocess seams.
• Artifact cards with workspace-relative paths, byte sizes, SHA-256 digests, and normalized media facts.
• Node 22/24 checks, real Harness/Remotion integration CI, and npm trusted-publishing automation.

Tool	Purpose	Writes files
remotion_doctor	Diagnose package, entry point, CLI, ffprobe, and browser readiness	No
remotion_list_compositions	Return registered composition IDs	No
remotion_render_still	Render a PNG or JPEG frame	Yes
remotion_render_video	Render and metadata-probe a video	Yes
remotion_probe_output	Return normalized media metadata	No

The skill and executable tools are separate Cordis rows, so an operator can disable either capability without editing the other.

Proof and release status

The repository includes three distinct evidence levels:

Evidence	What it proves	Current record
Unit and contract checks	Skill lifecycle, bundle rows, routed resources, eval cases, tool schemas, argv safety, path rejection, artifact presentation	Test source
Real Harness probe	Tool registry mount, managed subprocess execution, project doctor, bundled ffprobe, and checked-in MP4 metadata	Smoke results
Browser-backed integration	Composition discovery plus a fresh still and video rendered through all five tools	Integration workflow

The checked-in demo is a real H.264 render at 1280×720, 30 fps, and about 12 seconds. A release is not declared fully proven until the browser-backed integration workflow passes for the release commit. Probe-only success is deliberately not presented as a render-tool pass.

Requirements and safety boundary

• Node.js ^22.19.0 or >=24.0.0.
• DeepSeek Harness host packages before 0.2.0: dsh-skill, dsh-tools, and dsh-subprocess.
• A trusted Remotion project with its own project-local Remotion dependencies.
• Chrome/Chromium configured by the operator, or Remotion's supported browser acquisition.

Rendering executes the selected project's JavaScript and installed dependencies. Tool paths are confined to the active session workspace, commands use fixed argument arrays, output replacement is opt-in, process output and props are bounded, and cancellation reaches the managed process tree. The plugin itself collects no telemetry, stores no credentials, and uploads no media; project code, remote assets, or Remotion browser acquisition may still use the network. See Security and Tool contract.

Verify, configure, or remove

Inspect the composed profile:

dsh --profile web --dump-config

It should contain both remotion-video-plugin and remotion-video-tools. A trusted browser can be configured on the tools row:

- id: remotion-video-tools
  name: '@chenjie1129/dsh-remotion-video-plugin/tools'
  config:
    browserExecutable: /absolute/path/to/chrome-or-chromium
    browserMode: chrome-for-testing

Remove both rows by uninstalling the bundle, then restart Harness:

dsh plugin --profile web remove @chenjie1129/dsh-remotion-video-plugin

Development and release

npm ci
npm run check
npm run release:verify
npm run test:e2e -- --probe-only

Rendering changes must also pass the full npm run test:e2e command with a real Harness checkout and approved browser. See Compatibility, Smoke test, Release procedure, Contributing, and Changelog.

Project status and license

This is an independent community plugin, not an official DeepSeek or Remotion project. The plugin is MIT licensed. Remotion has separate license terms; users are responsible for checking them for their team and usage model.