Automated video editing

Follow-up prompts

Every edit runs inside a thread. Pass the thread back and the agent builds on what it already did instead of starting over.

Follow-up edits

Send another request with the same project_id and thread_id. The agent keeps its full context, so “make the intro shorter” is enough.

curl -X POST https://api.rendley.com/v1/agent \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "prompt": "Make the intro shorter and add a call-to-action at the end.",
    "project_id": "3f0d5a4e-3d2a-4c1f-9b3e-2a1c4d5e6f70",
    "thread_id": "7e5b3c19-4d82-4a76-9f01-6c8d2b5a3e47"
  }'

project_id is required whenever you pass thread_id. A thread without its project is a 400.

Omit thread_id to start a new thread when the request is unrelated. A thread carries its whole history, so reusing one across videos misleads the agent.

Only one edit can run on a project at a time. A second request returns 409 AGENT_PROJECT_BUSY with the blocking job’s id and status. Poll the active job, answer it if it is waiting for input, or cancel it before starting another edit.

Example follow-up prompts

Threads keep context, so follow-up instructions can be short and conversational:

Goal	Prompt
Tighten the intro	`"Make the intro shorter: cut it to 5 seconds."`
Add captions	`"Add auto-captions with a bold white style."`
Change music	`"Replace the background music with something upbeat."`
Adjust pacing	`"Speed up the middle section by 1.5x."`
Add a CTA	`"Add a subscribe call-to-action card at the end."`

The agent applies each change on top of the previous result, so edits accumulate.

Thread management

Store the thread_id with its project_id. Three rules cover most cases:

One thread per video project. Reuse the thread as long as changes relate to the same video.
New thread for a new video. Omit thread_id when you switch to a different project or an unrelated concept.
Do not fork threads. Sending the same thread_id in two parallel requests produces a race condition. Wait for one edit to finish before starting the next.