Variable useAgentTransformConst Alpha

Transforms an existing document or selected fields using Sanity Agent Actions.

• Accepts instruction and instructionParams (constants, fields, documents, GROQ queries).
• Can write to the same or a different targetDocument (create/edit), and target specific paths.
• Supports per-path image transform instructions and image description operations.
• Optional temperature, async, noWrite, conditionalPaths.

Returns a stable callback that triggers the action and yields a Subscribable stream.