The definition of an agent instance, as submitted at creation. The systemPrompt is a plain
string here for backwards compatibility with existing create requests; the read side
(AgentInstanceDefinitionResult) exposes it as content blocks instead. This write-side
string is deprecated and will be removed as part of #58795.
The definition of an agent instance, as submitted at creation. The systemPrompt is a plain string here for backwards compatibility with existing create requests; the read side (AgentInstanceDefinitionResult) exposes it as content blocks instead. This write-side string is deprecated and will be removed as part of #58795.