1 files changed, 0 insertions, 151 deletions
diff --git a/packages/server/src/utils/nextSpeakerChecker.ts b/packages/server/src/utils/nextSpeakerChecker.ts
deleted file mode 100644
index 66fa4395..00000000
--- a/packages/server/src/utils/nextSpeakerChecker.ts
+++ /dev/null
@@ -1,151 +0,0 @@
-/**
- * @license
- * Copyright 2025 Google LLC
- * SPDX-License-Identifier: Apache-2.0
- */
-
-import { Content, SchemaUnion, Type } from '@google/genai';
-import { GeminiClient } from '../core/client.js';
-import { GeminiChat } from '../core/geminiChat.js';
-import { isFunctionResponse } from './messageInspectors.js';
-
-const CHECK_PROMPT = `Analyze *only* the content and structure of your immediately preceding response (your last turn in the conversation history). Based *strictly* on that response, determine who should logically speak next: the 'user' or the 'model' (you).
-**Decision Rules (apply in order):**
-1.  **Model Continues:** If your last response explicitly states an immediate next action *you* intend to take (e.g., "Next, I will...", "Now I'll process...", "Moving on to analyze...", indicates an intended tool call that didn't execute), OR if the response seems clearly incomplete (cut off mid-thought without a natural conclusion), then the **'model'** should speak next.
-2.  **Question to User:** If your last response ends with a direct question specifically addressed *to the user*, then the **'user'** should speak next.
-3.  **Waiting for User:** If your last response completed a thought, statement, or task *and* does not meet the criteria for Rule 1 (Model Continues) or Rule 2 (Question to User), it implies a pause expecting user input or reaction. In this case, the **'user'** should speak next.
-**Output Format:**
-Respond *only* in JSON format according to the following schema. Do not include any text outside the JSON structure.
-\`\`\`json
-{
-  "type": "object",
-  "properties": {
-    "reasoning": {
-        "type": "string",
-        "description": "Brief explanation justifying the 'next_speaker' choice based *strictly* on the applicable rule and the content/structure of the preceding turn."
-    },
-    "next_speaker": {
-      "type": "string",
-      "enum": ["user", "model"],
-      "description": "Who should speak next based *only* on the preceding turn and the decision rules."
-    }
-  },
-  "required": ["next_speaker", "reasoning"]
-}
-\`\`\`
-`;
-
-const RESPONSE_SCHEMA: SchemaUnion = {
-  type: Type.OBJECT,
-  properties: {
-    reasoning: {
-      type: Type.STRING,
-      description:
-        "Brief explanation justifying the 'next_speaker' choice based *strictly* on the applicable rule and the content/structure of the preceding turn.",
-    },
-    next_speaker: {
-      type: Type.STRING,
-      enum: ['user', 'model'],
-      description:
-        'Who should speak next based *only* on the preceding turn and the decision rules',
-    },
-  },
-  required: ['reasoning', 'next_speaker'],
-};
-
-export interface NextSpeakerResponse {
-  reasoning: string;
-  next_speaker: 'user' | 'model';
-}
-
-export async function checkNextSpeaker(
-  chat: GeminiChat,
-  geminiClient: GeminiClient,
-  abortSignal: AbortSignal,
-): Promise<NextSpeakerResponse | null> {
-  // We need to capture the curated history because there are many moments when the model will return invalid turns
-  // that when passed back up to the endpoint will break subsequent calls. An example of this is when the model decides
-  // to respond with an empty part collection if you were to send that message back to the server it will respond with
-  // a 400 indicating that model part collections MUST have content.
-  const curatedHistory = chat.getHistory(/* curated */ true);
-
-  // Ensure there's a model response to analyze
-  if (curatedHistory.length === 0) {
-    // Cannot determine next speaker if history is empty.
-    return null;
-  }
-
-  const comprehensiveHistory = chat.getHistory();
-  // If comprehensiveHistory is empty, there is no last message to check.
-  // This case should ideally be caught by the curatedHistory.length check earlier,
-  // but as a safeguard:
-  if (comprehensiveHistory.length === 0) {
-    return null;
-  }
-  const lastComprehensiveMessage =
-    comprehensiveHistory[comprehensiveHistory.length - 1];
-
-  // If the last message is a user message containing only function_responses,
-  // then the model should speak next.
-  if (
-    lastComprehensiveMessage &&
-    isFunctionResponse(lastComprehensiveMessage)
-  ) {
-    return {
-      reasoning:
-        'The last message was a function response, so the model should speak next.',
-      next_speaker: 'model',
-    };
-  }
-
-  if (
-    lastComprehensiveMessage &&
-    lastComprehensiveMessage.role === 'model' &&
-    lastComprehensiveMessage.parts &&
-    lastComprehensiveMessage.parts.length === 0
-  ) {
-    lastComprehensiveMessage.parts.push({ text: '' });
-    return {
-      reasoning:
-        'The last message was a filler model message with no content (nothing for user to act on), model should speak next.',
-      next_speaker: 'model',
-    };
-  }
-
-  // Things checked out. Lets proceed to potentially making an LLM request.
-
-  const lastMessage = curatedHistory[curatedHistory.length - 1];
-  if (!lastMessage || lastMessage.role !== 'model') {
-    // Cannot determine next speaker if the last turn wasn't from the model
-    // or if history is empty.
-    return null;
-  }
-
-  const contents: Content[] = [
-    ...curatedHistory,
-    { role: 'user', parts: [{ text: CHECK_PROMPT }] },
-  ];
-
-  try {
-    const parsedResponse = (await geminiClient.generateJson(
-      contents,
-      RESPONSE_SCHEMA,
-      abortSignal,
-    )) as unknown as NextSpeakerResponse;
-
-    if (
-      parsedResponse &&
-      parsedResponse.next_speaker &&
-      ['user', 'model'].includes(parsedResponse.next_speaker)
-    ) {
-      return parsedResponse;
-    }
-    return null;
-  } catch (error) {
-    console.warn(
-      'Failed to talk to Gemini endpoint when seeing if conversation should continue.',
-      error,
-    );
-    return null;
-  }
-}