Claude Opus 4 5 Migration

Handles the migration from Sonnet 4.0, Sonnet 4.5, or Opus 4.1 to Opus 4.5 by updating model strings across different platforms (Anthropic API, AWS Bedrock, Vertex AI, Azure) and removing unsupported beta headers. The workflow is straightforward: search for old model references, swap them out, add the effort parameter set to high, and summarize changes. What makes this useful is the prompt adjustment guidance for known Opus 4.5 quirks like tool overtriggering and over-engineering tendencies, though it only applies those fixes when you actually hit problems. Smart that it skips Haiku migrations entirely rather than pretending to handle everything. Most migrations will just be string replacements, which is exactly what you want.