Remove provider-level tool validation, add validateToolCall helper

packages/agent/src/agent.ts

@@ -221,7 +221,6 @@ export class Agent {
 			tools: this._state.tools,
 			model,
 			reasoning,
-			validateToolCallsAtProvider: false,
 			getQueuedMessages: async <T>() => {
 				// Return queued messages based on queue mode
 				if (this.queueMode === "one-at-a-time") {

packages/agent/src/transports/AppTransport.ts

@@ -77,7 +77,6 @@ function streamSimpleProxy(
 						temperature: options.temperature,
 						maxTokens: options.maxTokens,
 						reasoning: options.reasoning,
-						validateToolCallsAtProvider: options.validateToolCallsAtProvider,
 						// Don't send apiKey or signal - those are added server-side
 					},
 				}),
@@ -366,7 +365,6 @@ export class AppTransport implements AgentTransport {
 			model: cfg.model,
 			reasoning: cfg.reasoning,
 			getQueuedMessages: cfg.getQueuedMessages,
-			validateToolCallsAtProvider: cfg.validateToolCallsAtProvider ?? false,
 		};
 
 		// Yield events from the upstream agentLoop iterator

packages/agent/src/transports/ProviderTransport.ts

@@ -65,7 +65,6 @@ export class ProviderTransport implements AgentTransport {
 			reasoning: cfg.reasoning,
 			apiKey,
 			getQueuedMessages: cfg.getQueuedMessages,
-			validateToolCallsAtProvider: cfg.validateToolCallsAtProvider ?? false,
 		};
 
 		// Yield events from agentLoop

packages/agent/src/transports/types.ts

@@ -9,7 +9,6 @@ export interface AgentRunConfig {
 	model: Model<any>;
 	reasoning?: "low" | "medium" | "high";
 	getQueuedMessages?: <T>() => Promise<QueuedMessage<T>[]>;
-	validateToolCallsAtProvider?: boolean;
 }
 
 /**