fix(gateway): avoid whatsapp fallback for internal runs

src/agents/tools/agent-step.ts

@@ -23,6 +23,7 @@ export async function runAgentStep(params: {
   message: string;
   extraSystemPrompt: string;
   timeoutMs: number;
+  provider?: string;
   lane?: string;
 }): Promise<string | undefined> {
   const stepIdem = crypto.randomUUID();
@@ -33,6 +34,7 @@ export async function runAgentStep(params: {
       sessionKey: params.sessionKey,
       idempotencyKey: stepIdem,
       deliver: false,
+      provider: params.provider ?? "webchat",
       lane: params.lane ?? "nested",
       extraSystemPrompt: params.extraSystemPrompt,
     },

src/agents/tools/sessions-send-tool.ts

@@ -10,6 +10,7 @@ import {
   parseAgentSessionKey,
 } from "../../routing/session-key.js";
 import { SESSION_LABEL_MAX_LENGTH } from "../../sessions/session-label.js";
+import type { GatewayMessageProvider } from "../../utils/message-provider.js";
 import { readLatestAssistantReply, runAgentStep } from "./agent-step.js";
 import type { AnyAgentTool } from "./common.js";
 import { jsonResult, readStringParam } from "./common.js";
@@ -42,7 +43,7 @@ const SessionsSendToolSchema = Type.Object({
 
 export function createSessionsSendTool(opts?: {
   agentSessionKey?: string;
-  agentProvider?: string;
+  agentProvider?: GatewayMessageProvider;
   sandboxed?: boolean;
 }): AnyAgentTool {
   return {
@@ -296,6 +297,7 @@ export function createSessionsSendTool(opts?: {
         sessionKey: resolvedKey,
         idempotencyKey,
         deliver: false,
+        provider: "webchat",
         lane: "nested",
         extraSystemPrompt: agentMessageContext,
       };

src/agents/tools/sessions-spawn-tool.ts

@@ -9,6 +9,7 @@ import {
   normalizeAgentId,
   parseAgentSessionKey,
 } from "../../routing/session-key.js";
+import type { GatewayMessageProvider } from "../../utils/message-provider.js";
 import { resolveAgentConfig } from "../agent-scope.js";
 import { buildSubagentSystemPrompt } from "../subagent-announce.js";
 import { registerSubagentRun } from "../subagent-registry.js";
@@ -35,7 +36,7 @@ const SessionsSpawnToolSchema = Type.Object({
 
 export function createSessionsSpawnTool(opts?: {
   agentSessionKey?: string;
-  agentProvider?: string;
+  agentProvider?: GatewayMessageProvider;
   sandboxed?: boolean;
 }): AnyAgentTool {
   return {