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claude-api-in-prototypes

Add Claude-powered features, such as summarization, to HTML artifacts using a built-in helper. No SDK or API key is needed, and tools defined in the page can run during a request before the final text is returned.

OriginalShow the original description

Call Claude from your HTML artifacts via window.claude.complete

See how to install

Good for

  • Adding text summarization to an HTML prototype
  • Trying AI responses with conversation history
  • Connecting Claude to tools that run within a page

Files included (1)

  • SKILL.md1.1 KB

SKILL.md (original)

Review the instructions the agent will receive before you install.

Claude API in prototypes

Your HTML artifacts can call Claude via a built-in helper. No SDK or API key needed.

<script>
(async () => {
  const text = await window.claude.complete("Summarize this: ...");
  // or with a messages array:
  const text2 = await window.claude.complete({
    messages: [{ role: 'user', content: '...' }],
  });
})();
</script>

Calls default to claude-haiku-4-5 with a 1024-token output cap. The body may also set model (haiku/sonnet families only), max_tokens (up to 32000), system, tool_choice, and client tools — standard Messages API shapes, except each tool also carries run: async (input) => string and the helper executes tool calls in-page and loops (max 8 model calls), resolving with the final text. Handler throws become is_error tool_results. Server tools (web search etc.) are rejected; no streaming; rate-limited 15 calls/minute per user, loop iterations included. Shared artifacts run under the viewer's quota.

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