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

Release Notes from Commit / PR Diff

Turns a pasted git log or PR title dump into customer-facing Markdown release notes (Feature / Improvement / Fix), one tweet-length blurb, and an edit-before-publish checklist. Drops merge/chore noise, redacts likely secrets. Draft for human edit — not a hosted changelog or GitHub App.

$1.00/run

Podcast Episode → Newsletter Issue

Turns one podcast episode (title + pasted transcript or show notes) into a paste-ready Markdown newsletter: 3 subject lines, preheader, hook, takeaways, pull quotes, listen CTA, and an edit-before-send checklist. Draft for human edit — not a monthly clip/social suite.

$1.00/run

Support Macro Pack from FAQ / Help Center

Bootstraps a Zendesk/Intercom/Gorgias/Help Scout macro library from a public help-center URL and/or pasted FAQ/policy dump — Markdown + CSV with {{variables}}, tags, when-to-use, and NEEDS REVIEW flags. Not a live helpdesk push and not a ticket bot.

$1.00/run

Hiring Kit: JD + Interview Scorecard

Founder/hiring-manager kit for one open role: a polished Markdown JD plus ≤10 interview questions mapped to requirements and a strong/adequate/weak scorecard. Not legal/EEO advice and not a candidate resume tool.

$2.00/run

Podcast Show Notes

Turns one podcast episode — a public audio URL or a pasted transcript, plus the episode title — into full show notes: title options, a summary, bullet notes, timestamps, social clip quotes, and SEO keywords.

$1.00/run

Landing Page Critique

One-shot conversion teardown of a landing page: score out of 100, above-fold summary, headline/CTA critique, trust gaps, 7 prioritized fixes, and a rewritten hero. Conversion copy/UX, not SEO — fetches the live page's visible text and reads it like a CRO consultant, not a crawler.

$1.00/run

Email Subject Lab

Rewrites an email subject line and preview text into 8 subject alternatives and 3 preview-text options, with mobile-truncation length warnings and a heuristic spam-trigger-word scan — plus a best pick and why. Not a real inbox-placement API.

$1.00/run

Blog to Social Pack

Turns one blog post into a full text social pack — LinkedIn post, X/Twitter thread, Instagram/TikTok caption set, standalone hook lines, and newsletter blurbs — in a single run. Give it a URL or paste the article yourself.

$1.00/run

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.