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Ghost Writer is a content agent for operators and marketers who want researched, publish-ready blog posts without giving an AI an unsupervised byline. Describe a topic; the agent brainstorms angles, searches the web for current context, and presents a complete HTML draft in chat so you can edit, reject, or green-light publish. Use it when you need a steady cadence of posts but still want editorial control. In chat mode, nothing hits Ghost or WordPress until you confirm. For scheduled or headless runs, an explicit publish sentinel lets you automate the pipeline when you are ready to trust the loop. Ideal for product blogs, developer education, changelog-style explainers, and anyone who wants research-backed drafts that land in their CMS, with a human gate before the public post.

Why use it

• Full HTML drafts in chat: title, body, and structure ready to review
• Web research for current angles before the draft, not after
• Publish only after you confirm (chat) or an explicit publish sentinel (autonomous)
• Native clients for Ghost and WordPress, including optional feature images
• Keeps editorial control: no surprise posts from a runaway agent
• Works for interactive authoring and scheduled / headless publish runs
• Built for DigitalOcean Managed Agents (MARS) with a sandboxed LangGraph runtime

Requirements

• DigitalOcean Managed Agents / Harness Runtime (sandboxed LangGraph session)
• OpenAI-compatible inference provider (DigitalOcean Gradient / Inference recommended)
• Strong writing / reasoning models work best (e.g. deepseek-v4-pro or comparable)
• Network egress for live web research
• Ghost or WordPress credentials (BLOG\_TYPE, BLOG\_URL, BLOG\_API\_KEY) to publish

Software Included

This Marketplace listing does not include a detailed software list.

Getting Started After Deploying Ghost Writer

1. Get credentials for your blog. For Ghost, open **Settings**, **Integrations**, add a custom integration, and copy its Admin API key (id:secret). For WordPress, open **Users**, **Profile**, **Application Passwords**, create one, and use username:application-password. When you create the agent, set the secrets BLOG\_TYPE (ghost or wordpress), BLOG\_URL (your site root, such as https://myblog.com), and BLOG\_API\_KEY. Set BLOG\_TOPIC to a comma-separated list of the topics you write about.
2. Start a session and send Write a post about running LangGraph agents on DigitalOcean. The agent suggests angles, searches the web, and shows a complete HTML draft, then asks whether to publish or change it. Ask for edits as many times as you like. Reply publish it to post it live on your blog with a generated feature image when one is available. Nothing is published until you confirm.
3. To publish on a schedule, add a cron trigger. A cron trigger cannot use a spec whose permission default is ask, so point it at a copy of the agent spec with permissions.default: allow. Each firing starts a fresh session and sends \_\_GW\_PUBLISH\_\_, which picks one topic from BLOG\_TOPIC, researches it, skips angles you published recently, and publishes the post without asking. Use chat mode until you trust the drafts.

doctl harness-runtime triggers create \
--kind cron \
--name ghost-writer-weekly \
--session-mode fresh \
--spec specs/mars-ghost-writer-trigger.yaml \
--secret HARNESS\_INFERENCE\_API\_KEY=@~/.secrets/do-inference.key \
--secret BLOG\_TYPE=ghost \
--secret BLOG\_URL=https://myblog.com \
--secret BLOG\_API\_KEY=@~/.secrets/blog-api.key \
--prompt "\_\_GW\_PUBLISH\_\_" \
--cron-expr "0 9 \* \* 1" \
--timezone America/New\_York \
--output-mode email \
--output-email [email protected]

0 9 \* \* 1 is 09:00 every Monday in the timezone you set. The result email includes the published post’s URL. Pause or resume the trigger later with doctl harness-runtime triggers pause and resume.