fix: deprecate codersdk.AITaskPromptParameterName and reduce usage (#20501)

Depends on coder/sqlc#1
Fixes coder/internal#979
Updates coder/internal#973

site/src/api/api.ts

@@ -2661,27 +2661,6 @@ export type CreateTaskFeedbackRequest = {
 class ExperimentalApiMethods {
 	constructor(protected readonly axios: AxiosInstance) {}
 
-	getAITasksPrompts = async (
-		buildIds: TypesGen.WorkspaceBuild["id"][],
-	): Promise<TypesGen.AITasksPromptsResponse> => {
-		if (buildIds.length === 0) {
-			return {
-				prompts: {},
-			};
-		}
-
-		const response = await this.axios.get<TypesGen.AITasksPromptsResponse>(
-			"/api/experimental/aitasks/prompts",
-			{
-				params: {
-					build_ids: buildIds.join(","),
-				},
-			},
-		);
-
-		return response.data;
-	};
-
 	createTask = async (
 		user: string,
 		req: TypesGen.CreateTaskRequest,

site/src/api/typesGenerated.ts

@@ -108,23 +108,17 @@ export interface AIConfig {
  * AITaskPromptParameterName is the name of the parameter used to pass prompts
  * to AI tasks.
  *
- * Experimental: This value is experimental and may change in the future.
+ * Deprecated: This constant is deprecated and maintained only for backwards
+ * compatibility with older templates. Task prompts are now stored directly
+ * in the tasks.prompt database column. New code should access prompts via
+ * the Task.InitialPrompt field returned from task endpoints.
+ *
+ * This constant will be removed in a future major version. Templates should
+ * not rely on this parameter name, as the backend will continue to create it
+ * automatically for compatibility but reads from tasks.prompt.
  */
 export const AITaskPromptParameterName = "AI Prompt";
 
-// From codersdk/aitasks.go
-/**
- * AITasksPromptsResponse represents the response from the AITaskPrompts method.
- *
- * Experimental: This method is experimental and may change in the future.
- */
-export interface AITasksPromptsResponse {
-	/**
-	 * Prompts is a map of workspace build IDs to prompts.
-	 */
-	readonly prompts: Record<string, string>;
-}
-
 // From codersdk/allowlist.go
 /**
  * APIAllowListTarget represents a single allow-list entry using the canonical

site/src/modules/tasks/TaskPrompt/TaskPrompt.tsx

@@ -7,6 +7,7 @@ import type {
 	Template,
 	TemplateVersionExternalAuth,
 } from "api/typesGenerated";
+import { AITaskPromptParameterName } from "api/typesGenerated";
 import { ErrorAlert } from "components/Alert/ErrorAlert";
 import { Button } from "components/Button/Button";
 import { ExternalImage } from "components/ExternalImage/ExternalImage";
@@ -38,8 +39,6 @@ import { docs } from "utils/docs";
 import { PromptSelectTrigger } from "./PromptSelectTrigger";
 import { TemplateVersionSelect } from "./TemplateVersionSelect";
 
-const AI_PROMPT_PARAMETER_NAME = "AI Prompt";
-
 type TaskPromptProps = {
 	templates: Template[] | undefined;
 	error: unknown;
@@ -168,7 +167,7 @@ const CreateTaskForm: FC<CreateTaskFormProps> = ({ templates, onSuccess }) => {
 
 	// Read-only prompt if defined in preset
 	const presetPrompt = selectedPreset?.Parameters?.find(
-		(param) => param.Name === AI_PROMPT_PARAMETER_NAME,
+		(param) => param.Name === AITaskPromptParameterName,
 	)?.Value;
 	const isPromptReadOnly = !!presetPrompt;
 	useEffect(() => {