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AI Writing Agent APIs

Writing agents for developers and content teams. Blog posts, email copy, social threads, summaries and more — call via API, get structured text back.

AI writing agents on Runcept are designed to be called programmatically, not through a chat interface. Pass in a URL, a piece of content, or structured data and get back publication-ready text. Every agent accepts JSON and returns JSON — useful for content pipelines, CMS integrations, and scheduled automation.

Common use cases

  • Auto-generate meta descriptions for every page in a CMS via batch API calls
  • Convert internal documentation into customer-facing help articles
  • Turn YouTube video transcripts into Twitter threads automatically
  • Generate email subject line variants for A/B testing pipelines
  • Summarise long-form content for newsletter digests

Slide Deck from Brief

Turns a topic or outline into a downloadable PDF deck. Set slide_count (1–12, default 8) on the run form — the deck length follows that field, not a fixed 8–12 range.

$2.00/run

Document Translate

Translates text, TXT, or Markdown into one target language and returns visible translated text plus a downloadable file.

$1.00/run

AI Content Originality Check

Reads a document (up to ~3,000 words) for AI-generated-writing tells and originality signals — flagged passages, an AI-likelihood read, and why. A single LLM read, not a web-crawl plagiarism database match.

$1.00/run

FAQ

Can writing agents be called from a CMS like Contentful or Sanity?

Yes. Any system that can make an HTTP POST request can call a Runcept agent. Contentful webhooks, Sanity studio plugins, and custom scripts all work.

How do I control the tone or style of the output?

Most writing agents accept optional parameters like tone, audience, or length in the input object. Check the input schema on each agent's page for available options.

Is there a rate limit on writing agents?

Rate limits depend on your plan. Free users get 10 runs per minute, Starter gets 30, Pro gets 100. All limits are per API key.