Simulate conversation API deprecated; music streaming now with metadata

Music

• Stream music with details: Added Stream music with details (POST /v1/music/detailed/stream) for SSE streaming of composed audio plus detailed metadata, including composition plan, song metadata, base64 audio chunks and optional word timestamps via with_timestamps.

ElevenAgents

• Simulate conversation deprecation: Simulate conversation and Stream simulate conversation are deprecated in favor of Create test and Run tests on the agent.
• Tool interruption mode: disable_interruptions is deprecated across agent tool and MCP server schemas. Use interruption_mode (ToolInterruptionMode: allow, disable_during_tool, disable_during_tool_and_turn) instead, with per-tool overrides via interruption_mode on tool override models.
• Numeric evaluation scoring: Evaluation criteria schemas add optional scoring_mode (binary | numeric_uniform), optional max_score (integer) and optional score_instructions (string). Evaluation results add optional numeric score. Conversation analysis payloads add optional call_success_score and success_score.
• Conversation reasoning: Transcript and history models add optional reasoning (ConversationReasoningModel) and transcript responses add optional reasoned (boolean). Agent prompt and LLM schemas add optional enable_reasoning_summary (boolean).
• Conversation platform billing: Conversation-related models add optional platform_charge, platform_price and platform_usage with per-category breakdown via PlatformCategory and PlatformCategoryUsage.
• Conversation cost metadata: Conversation history metadata adds required read-only cost_fiat (number, USD).
• Unredacted webhook events: WebhookEventType adds unredacted_transcript and unredacted_audio for webhook subscriptions that need unredacted payloads.
• Workflow phone transfer UUI limit: UUITransferConfig.data maximum length increases from 256 to 8192 characters for RFC 7433 User-to-User Information on SIP REFER transfers.

Speech Engine

• Optional authentication bypass: JavaScript and Python SDK v2.56.0 add optional disableAuth / disable_auth on Speech Engine WebSocket clients. This is intended for integrations that protect the connection through other means, such as IP allowlisting or custom authentication headers, rather than API key authentication.

Workspaces

• Professional voice slot tracking: Subscription-style models add optional professional_voice_slots_used_in_workspace alongside clarified group-wide professional_voice_slots_used for consolidated billing visibility.

ElevenCreative Studio

• Caption styling: Caption style models add blur and border-radius fields. Enter and exit animation enums add slam, scale_down and slide_in.

SDK Releases

JavaScript SDK

• v2.56.0 - Added optional disableAuth on Speech Engine WebSocket clients. Regenerated from the latest OpenAPI schema with music detailed streaming, tool interruption_mode, evaluation scoring modes, conversation reasoning and platform billing fields.

Python SDK

• v2.56.0 - Added optional disable_auth on Speech Engine WebSocket clients. Regenerated from the latest OpenAPI schema with music detailed streaming, tool interruption_mode, evaluation scoring modes, conversation reasoning and platform billing fields.

CLI

• @elevenlabs/cli@0.5.5 - Agent create and update requests are now sent as raw JSON to preserve configuration round-trip fidelity.

API