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WHEN TO USE: - After list_chats, to read one chat's full transcript - To review chat analysis (summary, sentiment, success) for quality checks ERROR RECOVERY: - 401: API key is missing or invalid → configure_retell_api_key - 404: chat_id not found → check the ID returned by list_chats RELATED TOOLS: - li","write_action":false,"price_micros":0,"input_schema":null},{"name":"get_concurrency","description":"","write_action":false,"price_micros":0,"input_schema":null},{"name":"get_knowledge_base","description":"Get details of a specific knowledge base, including its sources and processing status. WHEN TO USE: - Check whether a knowledge base has finished processing (status \"complete\") - List the documents/URLs/texts a knowledge base contains - Verify a source was added before attaching the knowledge base to an agent ERROR RECOVERY: - 401: API key is missing or invalid → configure_retell_api_key - 404: kn","write_action":false,"price_micros":0,"input_schema":null},{"name":"get_phone_number","description":"","write_action":false,"price_micros":0,"input_schema":null},{"name":"get_retell_llm","description":"","write_action":false,"price_micros":0,"input_schema":null},{"name":"list_agents","description":"","write_action":false,"price_micros":0,"input_schema":null},{"name":"list_calls","description":"","write_action":false,"price_micros":0,"input_schema":null},{"name":"list_chat_agents","description":"List configured chat agents in your Retell account (paginated). 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