fix(bidi): Gemini 3.1 Flash Live compatibility for BidiGeminiLiveModel#2000
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jrdeck wants to merge 1 commit intostrands-agents:mainfrom
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fix(bidi): Gemini 3.1 Flash Live compatibility for BidiGeminiLiveModel#2000jrdeck wants to merge 1 commit intostrands-agents:mainfrom
jrdeck wants to merge 1 commit intostrands-agents:mainfrom
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Three fixes for Gemini 3.1 Flash Live (`gemini-3.1-flash-live-preview`):
1. Route text input through `send_realtime_input` instead of
`send_client_content`. Gemini 3.1 only accepts `send_client_content`
for seeding initial context history — mid-session text causes error
1007. `send_realtime_input(text=...)` is compatible with both 2.5
and 3.1 models.
2. Only include `session_resumption` in live config when a handle is
provided. Sending `{"handle": null}` causes Gemini 3.1 to reject
the session with error 1007.
3. Default `api_version` from `v1alpha` to `v1beta`. `v1alpha` is not
a documented Gemini Developer API version; `v1beta` is the correct
endpoint for the Live API.
Closes strands-agents#1999
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Summary
Fixes three incompatibilities that prevent
BidiGeminiLiveModelfrom working withgemini-3.1-flash-live-preview.Closes #1999
Changes
1. Route text input through
send_realtime_inputGemini 3.1 Flash Live only allows
send_client_contentfor seeding initial context history. Mid-session text (e.g.BidiTextInputEventfrom aBidiAgentauto-greeting) must usesend_realtime_input(text=...)instead. This path is also compatible with Gemini 2.5 models — no regression.Before:
_send_text_content→send_client_content→ error 1007After:
_send_text_content→send_realtime_input(text=...)→ audio response2. Omit
session_resumptionwhen no handle exists_build_live_configunconditionally injectedsession_resumption: {"handle": None}. Gemini 3.1 rejects this; 2.5 silently accepted it. Now only included when a handle is actually provided.3. Default
api_versiontov1beta_resolve_client_configdefaulted tov1alpha, which is not a documented Gemini Developer API version. Changed tov1beta— the correct endpoint for the Live API per Google's documentation.Test plan
test_gemini_live.pytests passsend_realtime_input(text=...)instead ofsend_client_contentgemini-3.1-flash-live-previewreturns audio chunks in response to text sent viasend_realtime_inputgemini-2.5-flash-native-audio-latestworks with the same code pathContext
Discovered by Clevvi while building a multi-agent voice assistant on Bedrock AgentCore + Strands. The workaround (subclassing
BidiGeminiLiveModel) is deployed in production — this PR upstreams the fix.