Download a completed Future Video Studio final render URL to a local file.
Use this only after fvs_get_render_status or fvs_get_paid_render_status returns
a final_video_url for a completed render. The tool performs an unauthenticated
HTTPS GET to that signed URL and writes the response bytes to output_path on the
MCP server's local filesystem. It does not call the FVS Agent API, spend wallet
credits, require FVS_AGENT_API_KEY, cancel jobs, or modify remote render state.
Side effects and constraints: output_path is a local filesystem path for the MCP
server process, parent directories are created, existing files are not replaced
unless overwrite is true, and large videos may take minutes to download. The
request timeout is 600 seconds. Use a fresh status check to refresh expired
signed URLs, and do not pass arbitrary or untrusted URLs.