markstream-react – Coding skill for AI agents

Markstream React

Overview

Wire the beta React renderer into React 18+ or Next.js without crossing client/server boundaries or reaching for AST control unnecessarily.

When to Use

Use for React/Next setup, root/next/server entrypoints, streaming, component overrides, or migration support. Pair with markstream-migration for renderer replacement.

Workflow

Inspect the existing package manager, installed package version and project conventions. A requested scoped integration already authorizes routine source/dependency edits; seek approval only for a material scope expansion or unresolved beta/alpha adoption decision.

1. Confirm React 18+ and acceptance of a beta package.

2. Install only requested peers and import markstream-react/index.css.

3. Use the root entry for client rendering, /next for Next-specific components, and /server for server rendering without client hooks.

4. Start with content and smoothStreaming="auto"; use nodes plus final only when another layer owns parsing.

5. For live chat disable fade and opt into the cursor. On completion set final, disable pacing/cursor, and enable fade only if desired.

6. Keep browser-only peers inside 'use client', dynamic ssr: false, or another minimal boundary.

7. Prefer streamingComponents for parser-backed tags and htmlComponents for sanitized props. Use scoped registry overrides for built-in nodes.

8. Keep htmlPolicy="safe" and Mermaid strict; validate client, server, and incremental paths.

Example

'use client' // Required when this example is used in a Next.js App Router client boundary

import MarkdownRender from 'markstream-react'
import 'markstream-react/index.css'

export function StreamingAnswer({
  content,
  isDone,
}: {
  content: string
  isDone: boolean
}) {
  return (
    <MarkdownRender
      content={content}
      final={isDone}
      fade={isDone}
      typewriter={!isDone}
      smoothStreaming={isDone ? false : 'auto'}
      htmlPolicy="safe"
    />
  )
}

Limitations

• The package is beta and requires React 18+.
• Browser-only peers require client boundaries under SSR.
• Complex parser parity requires separate migration review.

Security & Safety Notes

Review dependencies and never opt untrusted model output into trusted HTML or loose diagram rendering.

Verify props, export paths and peer ranges against the installed package, not a mutable upstream main. Test partial and completed streams, malformed/untrusted Markdown, links and image URLs, cancellation and reduced motion. Safe HTML and strict diagrams reduce exposure but do not alone enforce URL/network privacy or application component permissions.