Writing Crucible has two AI drafting tools in the Manuscript Editor to help when you're stuck:
Continue writing drafts the next passage from where your cursor is.
Continue writing with guidance lets you tell the AI what you want first: tone, point of view, story beats, things to avoid.
Nothing the AI writes is kept until you accept it.
Before you start
AI tools are part of the Professional plan (including the free trial). On other plans the options appear greyed out, with an Upgrade link.
They use your own AI provider key. Add one under Settings → AI Providers first. See Managing AI API Keys (BYOK).
Opening the AI menu
Put your cursor where you want the new text to start.
Type /. This works in the story (chapters, prologue, parts and the like). In front and back matter, such as a dedication or acknowledgments, / just types a slash.
Choose a Model if you want to change it, then pick Continue writing or Continue writing with guidance. The list only offers models your saved keys can run.
If you haven't added a key that can run a model, the model shows No model available, both options are greyed out, and the menu says Continue Writing uses your own AI provider key, and none is set up yet. Click Add a key to go to Settings.
Continue writing
The AI drafts a continuation from your cursor, using your manuscript so far, the chapter's context, and your notes and worldbuilding where relevant. No instructions needed.
Continue writing with guidance
This opens the Guided continuation dialog:
Scene: which scene you're writing, if your chapter outline has scenes.
Instructions: what the AI should focus on, such as tone, a beat, a reveal, constraints or point of view.
Length: Short (about 150–250 words), Scene (about 300–500, the default) or Extended (about 600–800).
Include previous context: on by default, so the AI reads what came before.
Generate becomes available once you've written some instructions.
Reviewing the draft
The draft appears in your manuscript, styled differently from your own text, with an AI draft ready bar:
Reject removes it completely.
Redo generates a new draft with the same settings.
Accept keeps it as normal text.
Nothing becomes part of your manuscript until you click Accept.
Custom prompts (optional)
To change how the AI approaches these tools, go to Settings → AI Prompts. Each tool (Continue Writing and Continue with Guidance) has its own prompt:
Turn on Use Custom.
Click Copy & Customize System Prompt to start from the built-in prompt, and edit it.
Click Save Prompt Settings.
Your custom prompt is used for all future generations from that tool. If Use Custom is on but the prompt is empty, the built-in prompt is used. Turn Use Custom off to go back to the default. Custom prompts apply to these two tools only; the AI editing tools always use the built-in prompts.
Tips
End your last paragraph pointing where you want the story to go.
Use guidance when voice or pacing matters.
Place your cursor deliberately: the AI continues from exactly there.
Read every draft before accepting it.
These tools are a drafting assistant. They don't write your book for you, and they never change your text without your approval.