feat: add agent actions

[ryanbonial]

Description

Added Agent Actions API to the Sanity SDK, exposing five key agent functions:

• agentGenerate: Generates content for documents or specific fields
• agentTransform: Transforms existing documents or fields
• agentTranslate: Translates documents or fields between languages
• agentPrompt: Prompts the LLM using instruction templates
• agentPatch: Performs schema-aware document patching

These functions are exposed both in the core package and as React hooks in the React package, allowing developers to leverage AI capabilities within Sanity applications.

What to review

• Implementation of agent action functions in packages/core/src/agent/agentActions.ts
• Type definitions for all agent action parameters and results
• React hooks implementation in packages/react/src/hooks/agent/agentActions.ts
• Test coverage for the agent actions
• API version handling for agent requests
• Public (alpha) exports in both core and React packages

Testing

Added comprehensive unit tests for all agent actions in agentActions.test.ts, covering:

• Observable return values from client methods
• Proper parameter passing to client methods
• Promise-to-Observable conversion for non-observable client methods

Fun gif

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Project	Deployment	Preview	Comments	Updated (UTC)
sdk-docs	Ready	Preview	Comment	Oct 28, 2025 10:06pm
sdk-kitchensink-react	Ready	Preview	Comment	Oct 28, 2025 10:06pm

[laurenashpole]

Not sure if you want a second pair of eyes from someone more familiar with our existing code and patterns but, if not, everything looks good to me!

I did one into an issue testing generating a document in Kitchen Sink but it could be one of the permissions errors I occasionally hit (the message was Not Found - Schema for schemaId '_.schemas.default' could not be not found.).