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[bot] Google GenAI Multimodal Live API sessions not instrumented #120

Open
Open
[bot] Google GenAI Multimodal Live API sessions not instrumented#120

Description

@braintrust-bot
braintrust-bot
bot
opened on Jun 3, 2026

Summary

The Google GenAI Java SDK has a stable Multimodal Live API (client.aio.live.connect() → AsyncSession) that enables real-time, bidirectional text and audio generation over WebSocket. This API surface is completely invisible to the current Braintrust instrumentation because BraintrustApiClient only wraps HTTP-based ApiClient.request() and asyncRequest() methods — WebSocket connections use an entirely separate transport that is never intercepted.

Braintrust already documents Live API tracing for Python (client.aio.live.connect() sessions and "tool calls made during Live API sessions"), but there is no equivalent Java instrumentation.

What is missing

BraintrustApiClient (the core instrumentation class, placed in the com.google.genai package to access package-private ApiClient) overrides exactly four methods:

ApiResponserequest(String, String, String, Optional<HttpOptions>) // line 186ApiResponserequest(String, String, byte[], Optional<HttpOptions>) // line 210CompletableFuture<ApiResponse> asyncRequest(String, String, String, ...) // line 239CompletableFuture<ApiResponse> asyncRequest(String, String, byte[], ...) // line 277

The Live API is not HTTP — it uses WebSocket (WSS) via org.java_websocket.client.WebSocketClient internally. The entry point is:

client.aio.live.connect(model, LiveConnectConfig) // → CompletableFuture<AsyncSession>

AsyncSession then provides:

  • sendClientContent(LiveSendClientContentParameters) — sends text/content turns
  • sendRealtimeInput(LiveSendRealtimeInputParameters) — streams real-time audio/video input
  • sendToolResponse(LiveSendToolResponseParameters) — responds to model tool calls
  • receive(Consumer<LiveServerMessage>) — registers callback for server messages

None of these are reachable via ApiClient.request(), so no spans are created for Live API sessions.

Why this is a distinct gap from #61

Issue #61 covers generateContentStream() not being instrumented (missing streaming HTTP method overrides). The Live API is fundamentally different:

Braintrust docs status

Braintrust docs at https://www.braintrust.dev/docs/integrations/ai-providers/gemini document Live API tracing for Python:

  • client.aio.live.connect() — supported (Python)
  • "async Live API round-trips" — supported (Python)
  • "tool calls made during Live API sessions" — supported (Python)
  • Java Live API: not_found — no mention in Java SDK documentation

Upstream sources

  • Google GenAI Java SDK Live API: introduced in v0.3.0 (2025-03-28), stable and progressively enhanced through v1.18.0 (the version this module targets) — https://github.com/googleapis/java-genai
  • Google GenAI Java SDK changelog: v0.3.0 "add types for Live API" and "Support Live API", v1.0.0 "add async support for Live API"
  • Gemini Live API docs: https://ai.google.dev/api/multimodal-live — real-time, bidirectional generative execution surface for text and audio

Local files inspected

  • braintrust-sdk/instrumentation/genai_1_18_0/src/main/java/com/google/genai/BraintrustApiClient.java — lines 186–312: only request() and asyncRequest() are overridden; no WebSocket or Live API interception
  • braintrust-sdk/instrumentation/genai_1_18_0/src/main/java/com/google/genai/BraintrustInstrumentation.java — wraps ApiClient into Client; no live client wrapping
  • braintrust-sdk/instrumentation/genai_1_18_0/src/test/java/dev/braintrust/instrumentation/genai/v1_18_0/BraintrustGenAITest.java — tests only sync/async generateContent; no Live API tests

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(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '
Issue · GitHub
      Skip to content
      [bot] Google GenAI Multimodal Live API sessions not instrumented #120
      Open
      Open
      [bot] Google GenAI Multimodal Live API sessions not instrumented#120
      Description
      @braintrust-bot
      braintrust-bot
      bot
      opened on Jun 3, 2026
      Summary
      The Google GenAI Java SDK has a stable Multimodal Live API (client.aio.live.connect() → AsyncSession) that enables real-time, bidirectional text and audio generation over WebSocket. This API surface is completely invisible to the current Braintrust instrumentation because BraintrustApiClient only wraps HTTP-based ApiClient.request() and asyncRequest() methods — WebSocket connections use an entirely separate transport that is never intercepted.
      Braintrust already documents Live API tracing for Python (client.aio.live.connect() sessions and "tool calls made during Live API sessions"), but there is no equivalent Java instrumentation.
      What is missing
      BraintrustApiClient (the core instrumentation class, placed in the com.google.genai package to access package-private ApiClient) overrides exactly four methods:
      ApiResponserequest(String, String, String, Optional<HttpOptions>) // line 186ApiResponserequest(String, String, byte[], Optional<HttpOptions>) // line 210CompletableFuture<ApiResponse> asyncRequest(String, String, String, ...) // line 239CompletableFuture<ApiResponse> asyncRequest(String, String, byte[], ...) // line 277
      The Live API is not HTTP — it uses WebSocket (WSS) via org.java_websocket.client.WebSocketClient internally. The entry point is:
      client.aio.live.connect(model, LiveConnectConfig) // → CompletableFuture<AsyncSession>
      AsyncSession then provides:
      • sendClientContent(LiveSendClientContentParameters) — sends text/content turns
      • sendRealtimeInput(LiveSendRealtimeInputParameters) — streams real-time audio/video input
      • sendToolResponse(LiveSendToolResponseParameters) — responds to model tool calls
      • receive(Consumer<LiveServerMessage>) — registers callback for server messages
      None of these are reachable via ApiClient.request(), so no spans are created for Live API sessions.
      Why this is a distinct gap from #61
      Issue #61 covers generateContentStream() not being instrumented (missing streaming HTTP method overrides). The Live API is fundamentally different:
      Braintrust docs status
      Braintrust docs at https://www.braintrust.dev/docs/integrations/ai-providers/gemini document Live API tracing for Python:
      • client.aio.live.connect() — supported (Python)
      • "async Live API round-trips" — supported (Python)
      • "tool calls made during Live API sessions" — supported (Python)
      • Java Live API: not_found — no mention in Java SDK documentation
      Upstream sources
      • Google GenAI Java SDK Live API: introduced in v0.3.0 (2025-03-28), stable and progressively enhanced through v1.18.0 (the version this module targets) — https://github.com/googleapis/java-genai
      • Google GenAI Java SDK changelog: v0.3.0 "add types for Live API" and "Support Live API", v1.0.0 "add async support for Live API"
      • Gemini Live API docs: https://ai.google.dev/api/multimodal-live — real-time, bidirectional generative execution surface for text and audio
      Local files inspected
      • braintrust-sdk/instrumentation/genai_1_18_0/src/main/java/com/google/genai/BraintrustApiClient.java — lines 186–312: only request() and asyncRequest() are overridden; no WebSocket or Live API interception
      • braintrust-sdk/instrumentation/genai_1_18_0/src/main/java/com/google/genai/BraintrustInstrumentation.java — wraps ApiClient into Client; no live client wrapping
      • braintrust-sdk/instrumentation/genai_1_18_0/src/test/java/dev/braintrust/instrumentation/genai/v1_18_0/BraintrustGenAITest.java — tests only sync/async generateContent; no Live API tests
      Metadata
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, 'i');
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(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
Issue · GitHub
          Skip to content
          [bot] Google GenAI Multimodal Live API sessions not instrumented #120
          Open
          Open
          [bot] Google GenAI Multimodal Live API sessions not instrumented#120
          Description
          @braintrust-bot
          braintrust-bot
          bot
          opened on Jun 3, 2026
          Summary
          The Google GenAI Java SDK has a stable Multimodal Live API (client.aio.live.connect() → AsyncSession) that enables real-time, bidirectional text and audio generation over WebSocket. This API surface is completely invisible to the current Braintrust instrumentation because BraintrustApiClient only wraps HTTP-based ApiClient.request() and asyncRequest() methods — WebSocket connections use an entirely separate transport that is never intercepted.
          Braintrust already documents Live API tracing for Python (client.aio.live.connect() sessions and "tool calls made during Live API sessions"), but there is no equivalent Java instrumentation.
          What is missing
          BraintrustApiClient (the core instrumentation class, placed in the com.google.genai package to access package-private ApiClient) overrides exactly four methods:
          ApiResponserequest(String, String, String, Optional<HttpOptions>) // line 186ApiResponserequest(String, String, byte[], Optional<HttpOptions>) // line 210CompletableFuture<ApiResponse> asyncRequest(String, String, String, ...) // line 239CompletableFuture<ApiResponse> asyncRequest(String, String, byte[], ...) // line 277
          The Live API is not HTTP — it uses WebSocket (WSS) via org.java_websocket.client.WebSocketClient internally. The entry point is:
          client.aio.live.connect(model, LiveConnectConfig) // → CompletableFuture<AsyncSession>
          AsyncSession then provides:
          • sendClientContent(LiveSendClientContentParameters) — sends text/content turns
          • sendRealtimeInput(LiveSendRealtimeInputParameters) — streams real-time audio/video input
          • sendToolResponse(LiveSendToolResponseParameters) — responds to model tool calls
          • receive(Consumer<LiveServerMessage>) — registers callback for server messages
          None of these are reachable via ApiClient.request(), so no spans are created for Live API sessions.
          Why this is a distinct gap from #61
          Issue #61 covers generateContentStream() not being instrumented (missing streaming HTTP method overrides). The Live API is fundamentally different:
          Braintrust docs status
          Braintrust docs at https://www.braintrust.dev/docs/integrations/ai-providers/gemini document Live API tracing for Python:
          • client.aio.live.connect() — supported (Python)
          • "async Live API round-trips" — supported (Python)
          • "tool calls made during Live API sessions" — supported (Python)
          • Java Live API: not_found — no mention in Java SDK documentation
          Upstream sources
          • Google GenAI Java SDK Live API: introduced in v0.3.0 (2025-03-28), stable and progressively enhanced through v1.18.0 (the version this module targets) — https://github.com/googleapis/java-genai
          • Google GenAI Java SDK changelog: v0.3.0 "add types for Live API" and "Support Live API", v1.0.0 "add async support for Live API"
          • Gemini Live API docs: https://ai.google.dev/api/multimodal-live — real-time, bidirectional generative execution surface for text and audio
          Local files inspected
          • braintrust-sdk/instrumentation/genai_1_18_0/src/main/java/com/google/genai/BraintrustApiClient.java — lines 186–312: only request() and asyncRequest() are overridden; no WebSocket or Live API interception
          • braintrust-sdk/instrumentation/genai_1_18_0/src/main/java/com/google/genai/BraintrustInstrumentation.java — wraps ApiClient into Client; no live client wrapping
          • braintrust-sdk/instrumentation/genai_1_18_0/src/test/java/dev/braintrust/instrumentation/genai/v1_18_0/BraintrustGenAITest.java — tests only sync/async generateContent; no Live API tests
          Metadata
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            Projects
            No projects
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              No milestone
              Relationships
              None yet
              Development
              No branches or pull requests
              Issue actions
              
, 'i');
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(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
Issue · GitHub
              Skip to content
              [bot] Google GenAI Multimodal Live API sessions not instrumented #120
              Open
              Open
              [bot] Google GenAI Multimodal Live API sessions not instrumented#120
              Description
              @braintrust-bot
              braintrust-bot
              bot
              opened on Jun 3, 2026
              Summary
              The Google GenAI Java SDK has a stable Multimodal Live API (client.aio.live.connect() → AsyncSession) that enables real-time, bidirectional text and audio generation over WebSocket. This API surface is completely invisible to the current Braintrust instrumentation because BraintrustApiClient only wraps HTTP-based ApiClient.request() and asyncRequest() methods — WebSocket connections use an entirely separate transport that is never intercepted.
              Braintrust already documents Live API tracing for Python (client.aio.live.connect() sessions and "tool calls made during Live API sessions"), but there is no equivalent Java instrumentation.
              What is missing
              BraintrustApiClient (the core instrumentation class, placed in the com.google.genai package to access package-private ApiClient) overrides exactly four methods:
              ApiResponserequest(String, String, String, Optional<HttpOptions>) // line 186ApiResponserequest(String, String, byte[], Optional<HttpOptions>) // line 210CompletableFuture<ApiResponse> asyncRequest(String, String, String, ...) // line 239CompletableFuture<ApiResponse> asyncRequest(String, String, byte[], ...) // line 277
              The Live API is not HTTP — it uses WebSocket (WSS) via org.java_websocket.client.WebSocketClient internally. The entry point is:
              client.aio.live.connect(model, LiveConnectConfig) // → CompletableFuture<AsyncSession>
              AsyncSession then provides:
              • sendClientContent(LiveSendClientContentParameters) — sends text/content turns
              • sendRealtimeInput(LiveSendRealtimeInputParameters) — streams real-time audio/video input
              • sendToolResponse(LiveSendToolResponseParameters) — responds to model tool calls
              • receive(Consumer<LiveServerMessage>) — registers callback for server messages
              None of these are reachable via ApiClient.request(), so no spans are created for Live API sessions.
              Why this is a distinct gap from #61
              Issue #61 covers generateContentStream() not being instrumented (missing streaming HTTP method overrides). The Live API is fundamentally different:
              Braintrust docs status
              Braintrust docs at https://www.braintrust.dev/docs/integrations/ai-providers/gemini document Live API tracing for Python:
              • client.aio.live.connect() — supported (Python)
              • "async Live API round-trips" — supported (Python)
              • "tool calls made during Live API sessions" — supported (Python)
              • Java Live API: not_found — no mention in Java SDK documentation
              Upstream sources
              • Google GenAI Java SDK Live API: introduced in v0.3.0 (2025-03-28), stable and progressively enhanced through v1.18.0 (the version this module targets) — https://github.com/googleapis/java-genai
              • Google GenAI Java SDK changelog: v0.3.0 "add types for Live API" and "Support Live API", v1.0.0 "add async support for Live API"
              • Gemini Live API docs: https://ai.google.dev/api/multimodal-live — real-time, bidirectional generative execution surface for text and audio
              Local files inspected
              • braintrust-sdk/instrumentation/genai_1_18_0/src/main/java/com/google/genai/BraintrustApiClient.java — lines 186–312: only request() and asyncRequest() are overridden; no WebSocket or Live API interception
              • braintrust-sdk/instrumentation/genai_1_18_0/src/main/java/com/google/genai/BraintrustInstrumentation.java — wraps ApiClient into Client; no live client wrapping
              • braintrust-sdk/instrumentation/genai_1_18_0/src/test/java/dev/braintrust/instrumentation/genai/v1_18_0/BraintrustGenAITest.java — tests only sync/async generateContent; no Live API tests
              Metadata
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                  No branches or pull requests
                  Issue actions
                  
, 'i');
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var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',
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})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '
Issue · GitHub
                  Skip to content
                  [bot] Google GenAI Multimodal Live API sessions not instrumented #120
                  Open
                  Open
                  [bot] Google GenAI Multimodal Live API sessions not instrumented#120
                  Description
                  @braintrust-bot
                  braintrust-bot
                  bot
                  opened on Jun 3, 2026
                  Summary
                  The Google GenAI Java SDK has a stable Multimodal Live API (client.aio.live.connect() → AsyncSession) that enables real-time, bidirectional text and audio generation over WebSocket. This API surface is completely invisible to the current Braintrust instrumentation because BraintrustApiClient only wraps HTTP-based ApiClient.request() and asyncRequest() methods — WebSocket connections use an entirely separate transport that is never intercepted.
                  Braintrust already documents Live API tracing for Python (client.aio.live.connect() sessions and "tool calls made during Live API sessions"), but there is no equivalent Java instrumentation.
                  What is missing
                  BraintrustApiClient (the core instrumentation class, placed in the com.google.genai package to access package-private ApiClient) overrides exactly four methods:
                  ApiResponserequest(String, String, String, Optional<HttpOptions>) // line 186ApiResponserequest(String, String, byte[], Optional<HttpOptions>) // line 210CompletableFuture<ApiResponse> asyncRequest(String, String, String, ...) // line 239CompletableFuture<ApiResponse> asyncRequest(String, String, byte[], ...) // line 277
                  The Live API is not HTTP — it uses WebSocket (WSS) via org.java_websocket.client.WebSocketClient internally. The entry point is:
                  client.aio.live.connect(model, LiveConnectConfig) // → CompletableFuture<AsyncSession>
                  AsyncSession then provides:
                  • sendClientContent(LiveSendClientContentParameters) — sends text/content turns
                  • sendRealtimeInput(LiveSendRealtimeInputParameters) — streams real-time audio/video input
                  • sendToolResponse(LiveSendToolResponseParameters) — responds to model tool calls
                  • receive(Consumer<LiveServerMessage>) — registers callback for server messages
                  None of these are reachable via ApiClient.request(), so no spans are created for Live API sessions.
                  Why this is a distinct gap from #61
                  Issue #61 covers generateContentStream() not being instrumented (missing streaming HTTP method overrides). The Live API is fundamentally different:
                  Braintrust docs status
                  Braintrust docs at https://www.braintrust.dev/docs/integrations/ai-providers/gemini document Live API tracing for Python:
                  • client.aio.live.connect() — supported (Python)
                  • "async Live API round-trips" — supported (Python)
                  • "tool calls made during Live API sessions" — supported (Python)
                  • Java Live API: not_found — no mention in Java SDK documentation
                  Upstream sources
                  • Google GenAI Java SDK Live API: introduced in v0.3.0 (2025-03-28), stable and progressively enhanced through v1.18.0 (the version this module targets) — https://github.com/googleapis/java-genai
                  • Google GenAI Java SDK changelog: v0.3.0 "add types for Live API" and "Support Live API", v1.0.0 "add async support for Live API"
                  • Gemini Live API docs: https://ai.google.dev/api/multimodal-live — real-time, bidirectional generative execution surface for text and audio
                  Local files inspected
                  • braintrust-sdk/instrumentation/genai_1_18_0/src/main/java/com/google/genai/BraintrustApiClient.java — lines 186–312: only request() and asyncRequest() are overridden; no WebSocket or Live API interception
                  • braintrust-sdk/instrumentation/genai_1_18_0/src/main/java/com/google/genai/BraintrustInstrumentation.java — wraps ApiClient into Client; no live client wrapping
                  • braintrust-sdk/instrumentation/genai_1_18_0/src/test/java/dev/braintrust/instrumentation/genai/v1_18_0/BraintrustGenAITest.java — tests only sync/async generateContent; no Live API tests
                  Metadata
                  Metadata
                  Assignees
                  No one assigned
                    Labels
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                    No labels
                    Type
                    No type
                    Projects
                    No projects
                      Milestone
                      No milestone
                      Relationships
                      None yet
                      Development
                      No branches or pull requests
                      Issue actions
                      
, 'i');
if (__m === '*' || __re.test(location.href)) {
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function tryTheater() {
var btn = document.querySelector('button[aria-label="Theater mode"], ytd-player #player button[title="Theater mode"]');
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}, 1000);
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observer.observe(document.body, { childList: true, subtree: true });
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})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
Issue · GitHub
                      Skip to content
                      [bot] Google GenAI Multimodal Live API sessions not instrumented #120
                      Open
                      Open
                      [bot] Google GenAI Multimodal Live API sessions not instrumented#120
                      Description
                      @braintrust-bot
                      braintrust-bot
                      bot
                      opened on Jun 3, 2026
                      Summary
                      The Google GenAI Java SDK has a stable Multimodal Live API (client.aio.live.connect() → AsyncSession) that enables real-time, bidirectional text and audio generation over WebSocket. This API surface is completely invisible to the current Braintrust instrumentation because BraintrustApiClient only wraps HTTP-based ApiClient.request() and asyncRequest() methods — WebSocket connections use an entirely separate transport that is never intercepted.
                      Braintrust already documents Live API tracing for Python (client.aio.live.connect() sessions and "tool calls made during Live API sessions"), but there is no equivalent Java instrumentation.
                      What is missing
                      BraintrustApiClient (the core instrumentation class, placed in the com.google.genai package to access package-private ApiClient) overrides exactly four methods:
                      ApiResponserequest(String, String, String, Optional<HttpOptions>) // line 186ApiResponserequest(String, String, byte[], Optional<HttpOptions>) // line 210CompletableFuture<ApiResponse> asyncRequest(String, String, String, ...) // line 239CompletableFuture<ApiResponse> asyncRequest(String, String, byte[], ...) // line 277
                      The Live API is not HTTP — it uses WebSocket (WSS) via org.java_websocket.client.WebSocketClient internally. The entry point is:
                      client.aio.live.connect(model, LiveConnectConfig) // → CompletableFuture<AsyncSession>
                      AsyncSession then provides:
                      • sendClientContent(LiveSendClientContentParameters) — sends text/content turns
                      • sendRealtimeInput(LiveSendRealtimeInputParameters) — streams real-time audio/video input
                      • sendToolResponse(LiveSendToolResponseParameters) — responds to model tool calls
                      • receive(Consumer<LiveServerMessage>) — registers callback for server messages
                      None of these are reachable via ApiClient.request(), so no spans are created for Live API sessions.
                      Why this is a distinct gap from #61
                      Issue #61 covers generateContentStream() not being instrumented (missing streaming HTTP method overrides). The Live API is fundamentally different:
                      Braintrust docs status
                      Braintrust docs at https://www.braintrust.dev/docs/integrations/ai-providers/gemini document Live API tracing for Python:
                      • client.aio.live.connect() — supported (Python)
                      • "async Live API round-trips" — supported (Python)
                      • "tool calls made during Live API sessions" — supported (Python)
                      • Java Live API: not_found — no mention in Java SDK documentation
                      Upstream sources
                      • Google GenAI Java SDK Live API: introduced in v0.3.0 (2025-03-28), stable and progressively enhanced through v1.18.0 (the version this module targets) — https://github.com/googleapis/java-genai
                      • Google GenAI Java SDK changelog: v0.3.0 "add types for Live API" and "Support Live API", v1.0.0 "add async support for Live API"
                      • Gemini Live API docs: https://ai.google.dev/api/multimodal-live — real-time, bidirectional generative execution surface for text and audio
                      Local files inspected
                      • braintrust-sdk/instrumentation/genai_1_18_0/src/main/java/com/google/genai/BraintrustApiClient.java — lines 186–312: only request() and asyncRequest() are overridden; no WebSocket or Live API interception
                      • braintrust-sdk/instrumentation/genai_1_18_0/src/main/java/com/google/genai/BraintrustInstrumentation.java — wraps ApiClient into Client; no live client wrapping
                      • braintrust-sdk/instrumentation/genai_1_18_0/src/test/java/dev/braintrust/instrumentation/genai/v1_18_0/BraintrustGenAITest.java — tests only sync/async generateContent; no Live API tests
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Issue · GitHub
                          Skip to content
                          [bot] Google GenAI Multimodal Live API sessions not instrumented #120
                          Open
                          Open
                          [bot] Google GenAI Multimodal Live API sessions not instrumented#120
                          Description
                          @braintrust-bot
                          braintrust-bot
                          bot
                          opened on Jun 3, 2026
                          Summary
                          The Google GenAI Java SDK has a stable Multimodal Live API (client.aio.live.connect() → AsyncSession) that enables real-time, bidirectional text and audio generation over WebSocket. This API surface is completely invisible to the current Braintrust instrumentation because BraintrustApiClient only wraps HTTP-based ApiClient.request() and asyncRequest() methods — WebSocket connections use an entirely separate transport that is never intercepted.
                          Braintrust already documents Live API tracing for Python (client.aio.live.connect() sessions and "tool calls made during Live API sessions"), but there is no equivalent Java instrumentation.
                          What is missing
                          BraintrustApiClient (the core instrumentation class, placed in the com.google.genai package to access package-private ApiClient) overrides exactly four methods:
                          ApiResponserequest(String, String, String, Optional<HttpOptions>) // line 186ApiResponserequest(String, String, byte[], Optional<HttpOptions>) // line 210CompletableFuture<ApiResponse> asyncRequest(String, String, String, ...) // line 239CompletableFuture<ApiResponse> asyncRequest(String, String, byte[], ...) // line 277
                          The Live API is not HTTP — it uses WebSocket (WSS) via org.java_websocket.client.WebSocketClient internally. The entry point is:
                          client.aio.live.connect(model, LiveConnectConfig) // → CompletableFuture<AsyncSession>
                          AsyncSession then provides:
                          • sendClientContent(LiveSendClientContentParameters) — sends text/content turns
                          • sendRealtimeInput(LiveSendRealtimeInputParameters) — streams real-time audio/video input
                          • sendToolResponse(LiveSendToolResponseParameters) — responds to model tool calls
                          • receive(Consumer<LiveServerMessage>) — registers callback for server messages
                          None of these are reachable via ApiClient.request(), so no spans are created for Live API sessions.
                          Why this is a distinct gap from #61
                          Issue #61 covers generateContentStream() not being instrumented (missing streaming HTTP method overrides). The Live API is fundamentally different:
                          Braintrust docs status
                          Braintrust docs at https://www.braintrust.dev/docs/integrations/ai-providers/gemini document Live API tracing for Python:
                          • client.aio.live.connect() — supported (Python)
                          • "async Live API round-trips" — supported (Python)
                          • "tool calls made during Live API sessions" — supported (Python)
                          • Java Live API: not_found — no mention in Java SDK documentation
                          Upstream sources
                          • Google GenAI Java SDK Live API: introduced in v0.3.0 (2025-03-28), stable and progressively enhanced through v1.18.0 (the version this module targets) — https://github.com/googleapis/java-genai
                          • Google GenAI Java SDK changelog: v0.3.0 "add types for Live API" and "Support Live API", v1.0.0 "add async support for Live API"
                          • Gemini Live API docs: https://ai.google.dev/api/multimodal-live — real-time, bidirectional generative execution surface for text and audio
                          Local files inspected
                          • braintrust-sdk/instrumentation/genai_1_18_0/src/main/java/com/google/genai/BraintrustApiClient.java — lines 186–312: only request() and asyncRequest() are overridden; no WebSocket or Live API interception
                          • braintrust-sdk/instrumentation/genai_1_18_0/src/main/java/com/google/genai/BraintrustInstrumentation.java — wraps ApiClient into Client; no live client wrapping
                          • braintrust-sdk/instrumentation/genai_1_18_0/src/test/java/dev/braintrust/instrumentation/genai/v1_18_0/BraintrustGenAITest.java — tests only sync/async generateContent; no Live API tests
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, 'i');
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Issue · GitHub
                              Skip to content
                              [bot] Google GenAI Multimodal Live API sessions not instrumented #120
                              Open
                              Open
                              [bot] Google GenAI Multimodal Live API sessions not instrumented#120
                              Description
                              @braintrust-bot
                              braintrust-bot
                              bot
                              opened on Jun 3, 2026
                              Summary
                              The Google GenAI Java SDK has a stable Multimodal Live API (client.aio.live.connect() → AsyncSession) that enables real-time, bidirectional text and audio generation over WebSocket. This API surface is completely invisible to the current Braintrust instrumentation because BraintrustApiClient only wraps HTTP-based ApiClient.request() and asyncRequest() methods — WebSocket connections use an entirely separate transport that is never intercepted.
                              Braintrust already documents Live API tracing for Python (client.aio.live.connect() sessions and "tool calls made during Live API sessions"), but there is no equivalent Java instrumentation.
                              What is missing
                              BraintrustApiClient (the core instrumentation class, placed in the com.google.genai package to access package-private ApiClient) overrides exactly four methods:
                              ApiResponserequest(String, String, String, Optional<HttpOptions>) // line 186ApiResponserequest(String, String, byte[], Optional<HttpOptions>) // line 210CompletableFuture<ApiResponse> asyncRequest(String, String, String, ...) // line 239CompletableFuture<ApiResponse> asyncRequest(String, String, byte[], ...) // line 277
                              The Live API is not HTTP — it uses WebSocket (WSS) via org.java_websocket.client.WebSocketClient internally. The entry point is:
                              client.aio.live.connect(model, LiveConnectConfig) // → CompletableFuture<AsyncSession>
                              AsyncSession then provides:
                              • sendClientContent(LiveSendClientContentParameters) — sends text/content turns
                              • sendRealtimeInput(LiveSendRealtimeInputParameters) — streams real-time audio/video input
                              • sendToolResponse(LiveSendToolResponseParameters) — responds to model tool calls
                              • receive(Consumer<LiveServerMessage>) — registers callback for server messages
                              None of these are reachable via ApiClient.request(), so no spans are created for Live API sessions.
                              Why this is a distinct gap from #61
                              Issue #61 covers generateContentStream() not being instrumented (missing streaming HTTP method overrides). The Live API is fundamentally different:
                              Braintrust docs status
                              Braintrust docs at https://www.braintrust.dev/docs/integrations/ai-providers/gemini document Live API tracing for Python:
                              • client.aio.live.connect() — supported (Python)
                              • "async Live API round-trips" — supported (Python)
                              • "tool calls made during Live API sessions" — supported (Python)
                              • Java Live API: not_found — no mention in Java SDK documentation
                              Upstream sources
                              • Google GenAI Java SDK Live API: introduced in v0.3.0 (2025-03-28), stable and progressively enhanced through v1.18.0 (the version this module targets) — https://github.com/googleapis/java-genai
                              • Google GenAI Java SDK changelog: v0.3.0 "add types for Live API" and "Support Live API", v1.0.0 "add async support for Live API"
                              • Gemini Live API docs: https://ai.google.dev/api/multimodal-live — real-time, bidirectional generative execution surface for text and audio
                              Local files inspected
                              • braintrust-sdk/instrumentation/genai_1_18_0/src/main/java/com/google/genai/BraintrustApiClient.java — lines 186–312: only request() and asyncRequest() are overridden; no WebSocket or Live API interception
                              • braintrust-sdk/instrumentation/genai_1_18_0/src/main/java/com/google/genai/BraintrustInstrumentation.java — wraps ApiClient into Client; no live client wrapping
                              • braintrust-sdk/instrumentation/genai_1_18_0/src/test/java/dev/braintrust/instrumentation/genai/v1_18_0/BraintrustGenAITest.java — tests only sync/async generateContent; no Live API tests
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