Add xAI realtime provider tools

[rosetta-livekit-bot]

Summary

• Add xAI ProviderTool classes for Realtime API web search, X search, and file search
• Serialize xAI provider tools into realtime session.update payloads
• Keep OpenAI Realtime function-tool retention robust when provider tools are present

Stacked on #1576 for the ProviderTool base abstraction, mirroring #1582's provider-tool pattern for xAI.

Testing

• pnpm build
• pnpm exec prettier --check .changeset/xai-provider-tools.md plugins/xai/src/index.ts plugins/xai/src/realtime/realtime_model.ts plugins/xai/src/tools.ts plugins/openai/src/realtime/realtime_model.ts

[changeset-bot]

🦋 Changeset detected

Latest commit: bd921b1

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 31 packages

Name	Type
@livekit/agents	Major
@livekit/agents-plugin-google	Major
@livekit/agents-plugin-openai	Major
@livekit/agents-plugin-xai	Major
@livekit/agents-plugin-anam	Major
@livekit/agents-plugin-assemblyai	Major
@livekit/agents-plugin-baseten	Major
@livekit/agents-plugin-bey	Major
@livekit/agents-plugin-cartesia	Major
@livekit/agents-plugin-cerebras	Major
@livekit/agents-plugin-deepgram	Major
@livekit/agents-plugin-elevenlabs	Major
@livekit/agents-plugin-fishaudio	Major
@livekit/agents-plugin-hedra	Major
@livekit/agents-plugin-hume	Major
@livekit/agents-plugin-inworld	Major
@livekit/agents-plugin-lemonslice	Major
@livekit/agents-plugin-liveavatar	Major
@livekit/agents-plugin-livekit	Major
@livekit/agents-plugin-minimax	Major
@livekit/agents-plugin-mistral	Major
@livekit/agents-plugin-mistralai	Major
@livekit/agents-plugin-neuphonic	Major
@livekit/agents-plugin-phonic	Major
@livekit/agents-plugin-resemble	Major
@livekit/agents-plugin-rime	Major
@livekit/agents-plugin-runway	Major
@livekit/agents-plugin-sarvam	Major
@livekit/agents-plugin-silero	Major
@livekit/agents-plugins-test	Major
@livekit/agents-plugin-trugen	Major

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[devin-ai-integration]

Devin Review found 1 new potential issue.

View 5 additional findings in Devin Review.

[devin-ai-integration]

🔴 Reconnect skips restoring xAI provider tools when no function tools are present

The reconnect() method in OpenAIRealtimeSession at plugins/openai/src/realtime/realtime_model.ts:1002 only checks Object.keys(this._tools.functionTools).length > 0 before sending the tools update event. Since functionTools only returns function tools (not provider tools), if an xAI session is configured with only provider tools (e.g., WebSearch, XSearch, FileSearch) and no function tools, those tools will not be sent to the server during reconnection. After the default 20-minute maxSessionDuration triggers a reconnect, the xAI provider tools are silently lost.

Reconnect condition only checks function tools

At plugins/openai/src/realtime/realtime_model.ts:1002-1004:

if (Object.keys(this._tools.functionTools).length > 0) {
  events.push(this.createToolsUpdateEvent(this._tools));
}

functionTools (agents/src/llm/tool_context.ts:287-289) only returns entries from _functionToolsMap, not _providerTools. The xAI RealtimeSession overrides createToolsUpdateEvent to append provider tools, but that method is never called when this condition is false.

(Refers to lines 1002-1004)

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