diff --git a/src/gateway/protocol/schema/agent.ts b/src/gateway/protocol/schema/agent.ts
index 9eba8b83594..2c2bf3c9359 100644
--- a/src/gateway/protocol/schema/agent.ts
+++ b/src/gateway/protocol/schema/agent.ts
@@ -73,6 +73,7 @@ export const AgentParamsSchema = Type.Object(
     timeout: Type.Optional(Type.Integer({ minimum: 0 })),
     lane: Type.Optional(Type.String()),
     extraSystemPrompt: Type.Optional(Type.String()),
+    workspace: Type.Optional(Type.String()),
     inputProvenance: Type.Optional(
       Type.Object(
         {
diff --git a/src/gateway/server-methods/agent.ts b/src/gateway/server-methods/agent.ts
index d9c3451ee9b..61c6bacca8d 100644
--- a/src/gateway/server-methods/agent.ts
+++ b/src/gateway/server-methods/agent.ts
@@ -189,6 +189,7 @@ export const agentHandlers: GatewayRequestHandlers = {
       groupSpace?: string;
       lane?: string;
       extraSystemPrompt?: string;
+      workspace?: string;
       idempotencyKey: string;
       timeout?: number;
       label?: string;
@@ -557,6 +558,7 @@ export const agentHandlers: GatewayRequestHandlers = {
         lane: request.lane,
         extraSystemPrompt: request.extraSystemPrompt,
         inputProvenance,
+        workspace: typeof request.workspace === "string" ? request.workspace.trim() : undefined,
       },
       defaultRuntime,
       context.deps,