Skip to content

Feat(ai-gemini): Gemini Realtime Adapter #405

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
nikas-belogolov wants to merge 7 commits into
base: main
Choose a base branch
from
Open

Feat(ai-gemini): Gemini Realtime Adapter #405

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
7 commits
Select commit Hold shift + click to select a range
d4874c6
Added gemini ephemeral realtime token
nikas-belogolov Mar 29, 2026
bb7d7b2
added initial realtime adapter
nikas-belogolov Mar 29, 2026
69ae10c
ci: apply automated fixes
autofix-ci[bot] Mar 29, 2026
f40f0c8
Merge branch 'main' into feat/gemini-realtime-chat
nikas-belogolov Mar 29, 2026
8d4097f
Added gemini adapter, refactored realtime client
nikas-belogolov Apr 13, 2026
dadfae9
Added gemini live option to example
nikas-belogolov Apr 13, 2026
0711441
Fixed refactoring of realtime client
nikas-belogolov Apr 13, 2026
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
5 changes: 5 additions & 0 deletions .changeset/huge-lizards-admire.md
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -0,0 +1,5 @@
---
'@tanstack/ai-gemini': minor
---

Added Gemini Realtime Adapter
15 changes: 13 additions & 2 deletions examples/ts-react-chat/src/lib/use-realtime.ts
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -6,9 +6,10 @@ import {
elevenlabsRealtime,
elevenlabsRealtimeToken,
} from '@tanstack/ai-elevenlabs'
import { geminiRealtime, geminiRealtimeToken } from '@tanstack/ai-gemini'
import { realtimeClientTools } from '@/lib/realtime-tools'

type Provider = 'openai' | 'elevenlabs'
type Provider = 'openai' | 'elevenlabs' | 'gemini'

const getRealtimeTokenFn = createServerFn({ method: 'POST' })
.inputValidator((data: { provider: Provider; agentId?: string }) => {
Expand All @@ -24,6 +25,12 @@ const getRealtimeTokenFn = createServerFn({ method: 'POST' })
})
}

if (data.provider === 'gemini') {
return realtimeToken({
adapter: geminiRealtimeToken(),
})
}

if (data.provider === 'elevenlabs') {
const agentId = data.agentId || process.env.ELEVENLABS_AGENT_ID
if (!agentId) {
Expand Down Expand Up @@ -55,7 +62,11 @@ export function useRealtime({
semanticEagerness?: 'low' | 'medium' | 'high'
}) {
const adapter =
provider === 'openai' ? openaiRealtime() : elevenlabsRealtime()
provider === 'openai'
? openaiRealtime()
: provider === 'gemini'
? geminiRealtime()
: elevenlabsRealtime()
Comment on lines +65 to +69
Copy link
Copy Markdown
Contributor

@coderabbitai coderabbitai bot Apr 13, 2026

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

⚠️ Potential issue | 🟠 Major

🧩 Analysis chain

🌐 Web query:

Gemini Live API JavaScript supported responseModalities per session and supported prebuilt voice names

💡 Result:

In the Gemini Live API JavaScript SDK (@google/genai), supported responseModalities are specified as an array in the session config, e.g., responseModalities: [Modality.AUDIO] or [Modality.TEXT]. These are set per session via LiveConnectConfig and determine the output types (AUDIO and/or TEXT) for that session. Native audio models primarily support AUDIO, while others support combinations including TEXT. Supported prebuilt voice names (used in speechConfig.voiceConfig.prebuiltVoiceConfig.voiceName) include 30 HD voices: Zephyr (Bright), Puck (Upbeat, default), Charon (Informative), Kore (Firm), Fenrir (Excitable), Leda (Youthful), Orus (Firm), Aoede (Breezy), Callirrhoe (Easy-going), Autonoe (Bright), Enceladus (Breathy), Iapetus (Clear), Laomedeia (Upbeat), Achernar (Soft), Alnilam (Firm), Schedar (Even), Gacrux (Mature), Pulcherrima (Forward), Sadachbia (Lively), Sadaltager (Knowledgeable), Sulafat (Warm), Umbriel (Easy-going), Erinome (Clear), Achird (Friendly), Algieba (Smooth), Algenib (Gravelly), Zubenelgenubi (Casual), Despina (Smooth), Rasalgethi (Informative), Vindemiatrix (Gentle). These are shared with TTS and configurable per session for audio responses.

Citations:

🏁 Script executed:

cat -n examples/ts-react-chat/src/lib/use-realtime.ts

Repository: TanStack/ai

Length of output: 3793

Update Gemini adapter to use Gemini-compatible voice and responseModalities configuration.

The geminiRealtime() adapter selected at line 68 is routed through shared defaults below that are incompatible with Gemini Live. Line 92 specifies voice: 'alloy' (an OpenAI voice), but Gemini Live only supports 30 prebuilt voices with names like Puck (default), Kore, Aoede, etc. Additionally, Gemini Live requires responseModalities to be explicitly set per session as an array (e.g., [Modality.AUDIO]) and only supports a single response modality per session, whereas the current config allows unconstrained modalities. The Gemini branch will fail on connection with these defaults.

🤖 Prompt for AI Agents 
Verify each finding against the current code and only fix it if needed.

In `@examples/ts-react-chat/src/lib/use-realtime.ts` around lines 65 - 69, The
Gemini branch is using shared OpenAI defaults (voice: 'alloy' and unconstrained
responseModalities) which Gemini Live rejects; update the geminiRealtime() path
so it supplies Gemini-compatible defaults: set voice to a valid Gemini prebuilt
name (e.g., 'Puck' or another supported name) instead of 'alloy', and set
responseModalities to an explicit single-element array (e.g., [Modality.AUDIO])
for the session; ensure geminiRealtime (or its caller in useRealtime) overrides
the shared defaults and enforces only one modality so the Gemini connection will
succeed.


return useRealtimeChat({
getToken: () =>
Expand Down
5 changes: 3 additions & 2 deletions examples/ts-react-chat/src/routes/realtime.tsx
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -13,11 +13,12 @@ import {
import { AudioSparkline } from '@/components/AudioSparkline'
import { useRealtime } from '@/lib/use-realtime'

type Provider = 'openai' | 'elevenlabs'
type Provider = 'openai' | 'elevenlabs' | 'gemini'
type OutputMode = 'audio+text' | 'text-only' | 'audio-only'

const PROVIDER_OPTIONS: Array<{ value: Provider; label: string }> = [
{ value: 'openai', label: 'OpenAI Realtime' },
{ value: 'gemini', label: 'Google Gemini' },
{ value: 'elevenlabs', label: 'ElevenLabs' },
]

Expand Down Expand Up @@ -275,7 +276,7 @@ function RealtimePage() {
</div>

{/* Tools indicator */}
{provider === 'openai' && (
{(provider === 'openai' || provider === 'gemini') && (
<div className="border-b border-orange-500/10 bg-gray-800/50 px-4 py-2">
<div className="flex items-center gap-2 text-xs text-gray-400">
<Wrench className="w-3 h-3" />
Expand Down
36 changes: 29 additions & 7 deletions packages/typescript/ai-client/src/realtime-client.ts
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -100,8 +100,30 @@ export class RealtimeClient {
this.clientTools.size > 0
? Array.from(this.clientTools.values())
: undefined

const {
instructions,
voice,
vadMode,
outputModalities,
temperature,
maxOutputTokens,
semanticEagerness,
providerOptions,
} = this.options

this.connection = await this.options.adapter.connect(
this.token,
this.token,
{
instructions,
voice,
vadMode,
outputModalities,
temperature,
maxOutputTokens,
semanticEagerness,
providerOptions,
},
toolsList,
)

Expand Down Expand Up @@ -500,12 +522,12 @@ export class RealtimeClient {

const toolsConfig = tools
? Array.from(this.clientTools.values()).map((t) => ({
name: t.name,
description: t.description,
inputSchema: t.inputSchema
? convertSchemaToJsonSchema(t.inputSchema)
: undefined,
}))
name: t.name,
description: t.description,
inputSchema: t.inputSchema
? convertSchemaToJsonSchema(t.inputSchema)
: undefined,
}))
: undefined

this.connection.updateSession({
Expand Down
8 changes: 7 additions & 1 deletion packages/typescript/ai-client/src/realtime-types.ts
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -25,11 +25,12 @@ export interface RealtimeAdapter {
/**
* Create a connection using the provided token
* @param token - The ephemeral token from the server
* @param clientTools - Optional client-side tools to register with the provider
* @param config - Initial session configuration (voice, instructions, etc.)
* @returns A connection instance
*/
connect: (
token: RealtimeToken,
config: RealtimeSessionConfig,
clientTools?: ReadonlyArray<AnyClientTool>,
) => Promise<RealtimeConnection>
}
Expand Down Expand Up @@ -148,6 +149,11 @@ export interface RealtimeClientOptions {
*/
semanticEagerness?: 'low' | 'medium' | 'high'

/**
* Provider-specific options
*/
providerOptions?: Record<string, unknown>

// Callbacks
onStatusChange?: (status: RealtimeStatus) => void
onModeChange?: (mode: RealtimeMode) => void
Expand Down
4 changes: 2 additions & 2 deletions packages/typescript/ai-elevenlabs/src/realtime/adapter.ts
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -40,9 +40,10 @@ export function elevenlabsRealtime(

async connect(
token: RealtimeToken,
_config: RealtimeSessionConfig,
clientToolDefs?: ReadonlyArray<AnyClientTool>,
): Promise<RealtimeConnection> {
return createElevenLabsConnection(token, options, clientToolDefs)
return createElevenLabsConnection(token, clientToolDefs)
},
}
}
Expand All @@ -52,7 +53,6 @@ export function elevenlabsRealtime(
*/
async function createElevenLabsConnection(
token: RealtimeToken,
_options: ElevenLabsRealtimeOptions,
clientToolDefs?: ReadonlyArray<AnyClientTool>,
): Promise<RealtimeConnection> {
const eventHandlers = new Map<RealtimeEvent, Set<RealtimeEventHandler<any>>>()
Expand Down
8 changes: 5 additions & 3 deletions packages/typescript/ai-gemini/package.json
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -40,14 +40,16 @@
"adapter"
],
"dependencies": {
"@google/genai": "^1.43.0"
"@google/genai": "^1.46.0"
},
"peerDependencies": {
"@tanstack/ai": "workspace:^"
"@tanstack/ai": "workspace:^",
"@tanstack/ai-client": "workspace:^"
},
"devDependencies": {
"@tanstack/ai": "workspace:*",
"@tanstack/ai-client": "workspace:*",
"@vitest/coverage-v8": "4.0.14",
"vite": "^7.2.7"
"vite": "^7.3.1"
}
}
6 changes: 6 additions & 0 deletions packages/typescript/ai-gemini/src/index.ts
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -82,3 +82,9 @@ export type {
GeminiDocumentMetadata,
GeminiMessageMetadataByModality,
} from './message-types'

// Realtime adapter
export {
geminiRealtime,
geminiRealtimeToken,
} from './realtime/index'
Loading