MCPInstall

portable-text-conversion

by sanity-io OfficialMarketing & SEO

Convert HTML and Markdown content into Portable Text blocks for Sanity. Use when migrating content from legacy CMSs, importing HTML or Markdown into Sanity, building content pipelines that ingest external content, converting rich text between formats, or programmatically creating Portable Text documents. Covers @portabletext/markdown (markdownToPortableText), @portabletext/block-tools (htmlToBlocks), custom deserializers, and the Portable Text specification for manual block construction.

Installs
2.8K
Last 24h
+12
Trending rank
#8046
Security
Not audited

Install

Works with every agent the skills CLI supports.

npx skills add https://github.com/sanity-io/agent-toolkit --skill portable-text-conversion
  1. 01

    Install

    Run the command in your project. The CLI asks which agents to install for.

  2. 02

    Describe the task

    Ask your agent for something this skill covers. It loads portable-text-conversion automatically when relevant.

  3. 03

    Review the result

    The agent follows the SKILL.md steps, scripts and references bundled with the skill.

SKILL.md

The instructions your agent reads when the skill is triggered.

Portable Text Conversion

Convert external content (HTML, Markdown) into Portable Text for Sanity. Three main approaches:

  1. markdownToPortableText — Convert Markdown directly using @portabletext/markdown (recommended for Markdown)
  2. htmlToBlocks — Parse HTML into PT blocks using @portabletext/block-tools (for HTML migration)
  3. Manual construction — Build PT blocks directly from any source (APIs, databases, etc.)

Portable Text Specification

Understand the target format before converting. PT is an array of blocks:

[
  {
    "_type": "block",
    "_key": "abc123",
    "style": "normal",
    "children": [
      {"_type": "span", "_key": "def456", "text": "Hello ", "marks": []},
      {"_type": "span", "_key": "ghi789", "text": "world", "marks": ["strong"]}
    ],
    "markDefs": []
  },
  {
    "_type": "block",
    "_key": "jkl012",
    "style": "h2",
    "children": [
      {"_type": "span", "_key": "mno345", "text": "A heading", "marks": []}
    ],
    "markDefs": []
  },
  {
    "_type": "image",
    "_key": "pqr678",
    "asset": {"_type": "reference", "_ref": "image-abc-200x200-png"}
  }
]

Key rules:

  • Every block and span needs _key (unique within the array)
  • _type: "block" is for text blocks; custom types use their own _type
  • markDefs holds annotation data; marks on spans reference markDefs[*]._key or are decorator strings
  • Lists use listItem ("bullet" | "number") and level (1, 2, 3...) on regular blocks

Conversion Rules

Read the rule file matching your source format:

  • Markdown → Portable Text: rules/markdown-to-pt.md — @portabletext/markdown with markdownToPortableText (recommended)
  • HTML → Portable Text: rules/html-to-pt.md — @portabletext/block-tools with htmlToBlocks
  • Manual PT Construction: rules/manual-construction.md — build blocks programmatically from any source

Note: @sanity/block-tools is the legacy package name. Always use @portabletext/block-tools for new projects. The API is the same.

FAQ

What does the portable-text-conversion skill do?

Convert HTML and Markdown content into Portable Text blocks for Sanity. Use when migrating content from legacy CMSs, importing HTML or Markdown into Sanity, building content pipelines that ingest external content, converting rich text between formats, or programmatically creating Portable Text documents. Covers @portabletext/markdown (markdownToPortableText), @portabletext/block-tools (htmlToBlocks), custom deserializers, and the Portable Text specification for manual block construction.

How do I install portable-text-conversion?

Run npx skills add https://github.com/sanity-io/agent-toolkit --skill portable-text-conversion in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/portable-text-conversion/ (personal) or .claude/skills/portable-text-conversion/ (project).

Which AI agents can use portable-text-conversion?

Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.

Is portable-text-conversion safe to install?

No partner security audit is available yet. Skills can run commands and scripts, so read the SKILL.md and any bundled files before installing.

Who maintains portable-text-conversion?

It is published by sanity-io in sanity-io/agent-toolkit, and it is an official skill from the maker of the technology it covers. It has 2,761 recorded installs.

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