Spawn 3 subagents, each with a different model. Give each the diff as part of the prompt:
Models to use:
oci/openai.gpt-5.4
oci/google.gemini-2.5-flash
oci/xai.grok-code-fast-1
Use spawn_subagent for each model with this prompt (include the diff inline):
Review this code diff. Identify bugs, security issues, performance problems,
and readability concerns. For each issue, provide the file, line, severity
(critical/warning/info), and a brief explanation.
{paste the diff here}
Use tools: ["read_file", "list_files", "grep"] so reviewers can check surrounding code.