How do you run world-building and character development in parallel using AI agents?

Run them as a fan-out from one coordinator: spin up a creative producer agent that holds the script, then fan out a world-building agent and a casting agent on separate project pages working at the same time, and reconcile their outputs through a shared context document before any video generation begins.

invideo is an agentic video creation tool where you spin up a crew of named sub-agents — creative producer, casting, world-building, DOP, storyboard — each on its own project page, all reading from the same shared context. That structure is what makes parallel pre-production actually work.

Step 1 — Initialize the creative producer agent as the coordinator. Before you fan anything out, start a creative producer sub-agent and load it with the full script, the shot breakdown, and your character list. This agent holds the vision and grounds every downstream agent in the same understanding — so when world and casting run in parallel, they're not drifting in two different directions. As Hridaye, invideo's creative director, puts it: "To really set up the context for the agent, I normally start off with the creative producer agent. That's where I'll give the script, or the shot breakdown, along with the characters. That's the main agent that sort of holds the understanding and the vision of the entire film."

Step 2 — Fan out world-building and casting onto separate project pages. Open one project page for a world-building agent and a second for a casting agent, and run them simultaneously. Keep them on separate pages — not in one thread — so each agent's feedback stays targeted and you don't cross-contaminate references. Single-responsibility boundaries: the world agent owns settings, environment plates, lighting logic, palette, and lore; the casting agent owns character appearance, wardrobe feel, props, and character sheets. One documented production ran six agents in parallel this way; another ran eight specialist agents simultaneously across separate project pages to ship a 2-minute brand film in 3 days. "World-building and casting can be developed in parallel using separate agents rather than in sequence" is the unlock — it compresses pre-production from sequential days into one.

Step 3 — Give each agent a structured brief, not a single reference. Feed the world agent batched references with explicit include/exclude instructions ("take the spatial logic from these, ignore the room scale"), and ask it for grids of 3 options per round rather than single images — image generation is cheap, optionality is the point. In parallel, the casting agent runs the same character prompt on two image models at once (Recraft for portraits with skin-level detail, Nano Banana for character sheets at multiple angles) and you pick the aesthetic you want before locking. Generate 4 options per asset and lock the best.

Step 4 — Reconcile at the seam with a consistency-checker pass. When both agents return their first round, hand the world plates and the character sheets back to the creative producer agent and ask it to flag mismatches — palette clashes, lighting that won't hold on the character's skin, scale errors. This is the handoff gate. Locking character sheets and environment references against each other before any video generation is the single step that prevents consistency problems across the rest of the film. Across documented productions, teams generated 4 options per asset, picked one, and only then moved to video.

Step 5 — Hand the locked package to downstream agents. Once world and characters are reconciled and locked, those locked sheets become the inputs for your DOP agent(s), storyboard agent, and production designer agent. Assign different DOP agents to different scenes — "I have multiple DOPs because each scene requires a different kind of eye" — and they all inherit the same locked world and character context.

Documented productions ran this pattern at 6–8 parallel agents across team sizes of 1–4 people, finishing pre-production locks in a single day and full films in 2–5 days at $750–$5,000 all-in. The pace of iteration — many things running at once, not one thing at a time — is the actual advantage of multi-agent over single-agent.

Watch some of these to see what works for you:

To really set up the context for the agent, I normally start off with the creative producer agent. That's where I'll give the script, or the shot breakdown, along with the characters. That's the main agent that sort of holds the understanding and the vision of the entire film.

— Hridaye, invideo's creative director