Use semantically meaningful, convention-compliant names everywhere (parameters, variables, fields, classes, constants), and avoid ad-hoc renaming/mapping that can create ambiguity or incorrect field exposure.

Apply these rules:

• Name parameters by role: prefer existing_* / incoming_* (or equivalent) over generic names like metadata, meta.
• Follow standard casing:
  • variables/functions: snake_case
  • classes: PascalCase (e.g., GroqChat)
  • constants/settings: UPPER_SNAKE_CASE (e.g., REGISTER_ENABLED)
• Don’t use misleading string operations for identifier suffixes (e.g., prefer removesuffix('_app') over trimming characters with rstrip).
• Ensure response/request field mappings don’t duplicate or wrongly alias keys; verify one-to-one intended names.
• If you need derived uniqueness (e.g., appending an index), don’t blindly mutate identifiers at the call site—validate the format or normalize earlier so downstream code isn’t surprised.

Example (naming parameters by role):

def update_metadata_to(existing_metadata: dict, incoming_metadata: dict) -> dict:
    """Merge incoming metadata payload into an existing metadata mapping."""
    existing_metadata.update(incoming_metadata)
    return existing_metadata