diff --git a/.changeset/beige-colts-design.md b/.changeset/beige-colts-design.md
new file mode 100644
index 000000000..499e591a5
--- /dev/null
+++ b/.changeset/beige-colts-design.md
@@ -0,0 +1,5 @@
+---
+'@tanstack/ai': minor
+---
+
+Added telemetry field to activities and events
diff --git a/packages/typescript/ai/src/activities/chat/index.ts b/packages/typescript/ai/src/activities/chat/index.ts
index feb5ef995..ed307b594 100644
--- a/packages/typescript/ai/src/activities/chat/index.ts
+++ b/packages/typescript/ai/src/activities/chat/index.ts
@@ -28,6 +28,7 @@ import type {
   RunFinishedEvent,
   SchemaInput,
   StreamChunk,
+  TelemetrySettings,
   TextMessageContentEvent,
   TextOptions,
   Tool,
@@ -130,6 +131,10 @@ export interface TextActivityOptions<
    * ```
    */
   stream?: TStream
+  /**
+   * Telemetry data for tracking and monitoring.
+   */
+  telemetry?: TextOptions['telemetry']
 }
 
 // ===========================
@@ -209,6 +214,7 @@ class TextEngine<
   private readonly streamId: string
   private readonly effectiveRequest?: Request | RequestInit
   private readonly effectiveSignal?: AbortSignal
+  private readonly telemetry?: TelemetrySettings
 
   private messages: Array<ModelMessage>
   private iterationCount = 0
@@ -241,6 +247,7 @@ class TextEngine<
       ? { signal: config.params.abortController.signal }
       : undefined
     this.effectiveSignal = config.params.abortController?.signal
+    this.telemetry = config.params.telemetry
   }
 
   /** Get the accumulated content after the chat loop completes */
@@ -942,6 +949,7 @@ class TextEngine<
     messageCount: number
     hasTools: boolean
     streaming: boolean
+    telemetry?: TelemetrySettings
   } {
     return {
       requestId: this.requestId,
@@ -960,6 +968,7 @@ class TextEngine<
       messageCount: this.initialMessageCount,
       hasTools: this.tools.length > 0,
       streaming: true,
+      telemetry: this.telemetry,
     }
   }
 
@@ -1194,10 +1203,10 @@ async function runAgenticStructuredOutput<TSchema extends SchemaInput>(
 }
 
 // Re-export adapter types
+export { BaseTextAdapter } from './adapter'
 export type {
-  TextAdapter,
-  TextAdapterConfig,
   StructuredOutputOptions,
   StructuredOutputResult,
+  TextAdapter,
+  TextAdapterConfig,
 } from './adapter'
-export { BaseTextAdapter } from './adapter'
diff --git a/packages/typescript/ai/src/activities/generateImage/index.ts b/packages/typescript/ai/src/activities/generateImage/index.ts
index d573b32f1..0caaa96af 100644
--- a/packages/typescript/ai/src/activities/generateImage/index.ts
+++ b/packages/typescript/ai/src/activities/generateImage/index.ts
@@ -6,8 +6,8 @@
  */
 
 import { aiEventClient } from '../../event-client.js'
+import type { ImageGenerationOptions, ImageGenerationResult } from '../../types'
 import type { ImageAdapter } from './adapter'
-import type { ImageGenerationResult } from '../../types'
 
 // ===========================
 // Activity Kind
@@ -74,6 +74,10 @@ export interface ImageActivityOptions<
   size?: ImageSizeForModel<TAdapter, TAdapter['model']>
   /** Provider-specific options for image generation */
   modelOptions?: ImageProviderOptionsForModel<TAdapter, TAdapter['model']>
+  /**
+   * Telemetry data for tracking and monitoring.
+   */
+  telemetry?: ImageGenerationOptions['telemetry']
 }
 
 // ===========================
@@ -152,6 +156,7 @@ export async function generateImage<
     numberOfImages: rest.numberOfImages,
     size: rest.size as string | undefined,
     modelOptions: rest.modelOptions as Record<string, unknown> | undefined,
+    telemetry: rest.telemetry,
     timestamp: startTime,
   })
 
@@ -168,6 +173,7 @@ export async function generateImage<
       })),
       duration,
       modelOptions: rest.modelOptions as Record<string, unknown> | undefined,
+      telemetry: rest.telemetry,
       timestamp: Date.now(),
     })
 
@@ -177,6 +183,7 @@ export async function generateImage<
         model,
         usage: result.usage,
         modelOptions: rest.modelOptions as Record<string, unknown> | undefined,
+        telemetry: rest.telemetry,
         timestamp: Date.now(),
       })
     }
@@ -199,9 +206,9 @@ export function createImageOptions<
 }
 
 // Re-export adapter types
+export { BaseImageAdapter } from './adapter'
 export type {
+  AnyImageAdapter,
   ImageAdapter,
   ImageAdapterConfig,
-  AnyImageAdapter,
 } from './adapter'
-export { BaseImageAdapter } from './adapter'
diff --git a/packages/typescript/ai/src/activities/generateSpeech/index.ts b/packages/typescript/ai/src/activities/generateSpeech/index.ts
index 39645ebab..2c0024573 100644
--- a/packages/typescript/ai/src/activities/generateSpeech/index.ts
+++ b/packages/typescript/ai/src/activities/generateSpeech/index.ts
@@ -6,8 +6,8 @@
  */
 
 import { aiEventClient } from '../../event-client.js'
+import type { TTSOptions, TTSResult } from '../../types'
 import type { TTSAdapter } from './adapter'
-import type { TTSResult } from '../../types'
 
 // ===========================
 // Activity Kind
@@ -53,6 +53,10 @@ export interface TTSActivityOptions<
   speed?: number
   /** Provider-specific options for TTS generation */
   modelOptions?: TTSProviderOptions<TAdapter>
+  /**
+   * Telemetry data for tracking and monitoring.
+   */
+  telemetry?: TTSOptions['telemetry']
 }
 
 // ===========================
@@ -117,6 +121,7 @@ export async function generateSpeech<
     format: rest.format,
     speed: rest.speed,
     modelOptions: rest.modelOptions as Record<string, unknown> | undefined,
+    telemetry: rest.telemetry,
     timestamp: startTime,
   })
 
@@ -133,6 +138,7 @@ export async function generateSpeech<
       contentType: result.contentType,
       duration,
       modelOptions: rest.modelOptions as Record<string, unknown> | undefined,
+      telemetry: rest.telemetry,
       timestamp: Date.now(),
     })
 
@@ -154,5 +160,5 @@ export function createSpeechOptions<
 }
 
 // Re-export adapter types
-export type { TTSAdapter, TTSAdapterConfig, AnyTTSAdapter } from './adapter'
 export { BaseTTSAdapter } from './adapter'
+export type { AnyTTSAdapter, TTSAdapter, TTSAdapterConfig } from './adapter'
diff --git a/packages/typescript/ai/src/activities/generateTranscription/index.ts b/packages/typescript/ai/src/activities/generateTranscription/index.ts
index dff9a477b..292bca5da 100644
--- a/packages/typescript/ai/src/activities/generateTranscription/index.ts
+++ b/packages/typescript/ai/src/activities/generateTranscription/index.ts
@@ -6,8 +6,8 @@
  */
 
 import { aiEventClient } from '../../event-client.js'
+import type { TranscriptionOptions, TranscriptionResult } from '../../types'
 import type { TranscriptionAdapter } from './adapter'
-import type { TranscriptionResult } from '../../types'
 
 // ===========================
 // Activity Kind
@@ -53,6 +53,10 @@ export interface TranscriptionActivityOptions<
   responseFormat?: 'json' | 'text' | 'srt' | 'verbose_json' | 'vtt'
   /** Provider-specific options for transcription */
   modelOptions?: TranscriptionProviderOptions<TAdapter>
+  /**
+   * Telemetry data for tracking and monitoring.
+   */
+  telemetry?: TranscriptionOptions['telemetry']
 }
 
 // ===========================
@@ -120,6 +124,7 @@ export async function generateTranscription<
     prompt: rest.prompt,
     responseFormat: rest.responseFormat,
     modelOptions: rest.modelOptions as Record<string, unknown> | undefined,
+    telemetry: rest.telemetry,
     timestamp: startTime,
   })
 
@@ -134,6 +139,7 @@ export async function generateTranscription<
     language: result.language,
     duration,
     modelOptions: rest.modelOptions as Record<string, unknown> | undefined,
+    telemetry: rest.telemetry,
     timestamp: Date.now(),
   })
 
@@ -156,9 +162,9 @@ export function createTranscriptionOptions<
 }
 
 // Re-export adapter types
+export { BaseTranscriptionAdapter } from './adapter'
 export type {
+  AnyTranscriptionAdapter,
   TranscriptionAdapter,
   TranscriptionAdapterConfig,
-  AnyTranscriptionAdapter,
 } from './adapter'
-export { BaseTranscriptionAdapter } from './adapter'
diff --git a/packages/typescript/ai/src/activities/generateVideo/index.ts b/packages/typescript/ai/src/activities/generateVideo/index.ts
index 9a7a46aa4..da9aae443 100644
--- a/packages/typescript/ai/src/activities/generateVideo/index.ts
+++ b/packages/typescript/ai/src/activities/generateVideo/index.ts
@@ -8,12 +8,13 @@
  */
 
 import { aiEventClient } from '../../event-client.js'
-import type { VideoAdapter } from './adapter'
 import type {
+  VideoGenerationOptions,
   VideoJobResult,
   VideoStatusResult,
   VideoUrlResult,
 } from '../../types'
+import type { VideoAdapter } from './adapter'
 
 // ===========================
 // Activity Kind
@@ -51,6 +52,10 @@ interface VideoActivityBaseOptions<
 > {
   /** The video adapter to use (must be created with a model) */
   adapter: TAdapter & { kind: typeof kind }
+  /**
+   * Telemetry data for tracking and monitoring.
+   */
+  telemetry?: VideoGenerationOptions['telemetry']
 }
 
 /**
@@ -202,16 +207,15 @@ export async function generateVideo<
  */
 export async function getVideoJobStatus<
   TAdapter extends VideoAdapter<string, object>,
->(options: {
-  adapter: TAdapter & { kind: typeof kind }
-  jobId: string
-}): Promise<{
+>(
+  options: VideoStatusOptions<TAdapter>,
+): Promise<{
   status: 'pending' | 'processing' | 'completed' | 'failed'
   progress?: number
   url?: string
   error?: string
 }> {
-  const { adapter, jobId } = options
+  const { adapter, jobId, ...rest } = options
   const requestId = createId('video-status')
   const startTime = Date.now()
 
@@ -221,6 +225,7 @@ export async function getVideoJobStatus<
     model: adapter.model,
     requestType: 'status',
     jobId,
+    telemetry: rest.telemetry,
     timestamp: startTime,
   })
 
@@ -241,6 +246,7 @@ export async function getVideoJobStatus<
         progress: statusResult.progress,
         url: urlResult.url,
         duration: Date.now() - startTime,
+        telemetry: rest.telemetry,
         timestamp: Date.now(),
       })
       return {
@@ -260,6 +266,7 @@ export async function getVideoJobStatus<
         error:
           error instanceof Error ? error.message : 'Failed to get video URL',
         duration: Date.now() - startTime,
+        telemetry: rest.telemetry,
         timestamp: Date.now(),
       })
       // If URL fetch fails, still return status
@@ -282,6 +289,7 @@ export async function getVideoJobStatus<
     progress: statusResult.progress,
     error: statusResult.error,
     duration: Date.now() - startTime,
+    telemetry: rest.telemetry,
     timestamp: Date.now(),
   })
 
@@ -307,9 +315,9 @@ export function createVideoOptions<
 }
 
 // Re-export adapter types
+export { BaseVideoAdapter } from './adapter'
 export type {
+  AnyVideoAdapter,
   VideoAdapter,
   VideoAdapterConfig,
-  AnyVideoAdapter,
 } from './adapter'
-export { BaseVideoAdapter } from './adapter'
diff --git a/packages/typescript/ai/src/activities/summarize/index.ts b/packages/typescript/ai/src/activities/summarize/index.ts
index ddee4280a..f28510324 100644
--- a/packages/typescript/ai/src/activities/summarize/index.ts
+++ b/packages/typescript/ai/src/activities/summarize/index.ts
@@ -6,12 +6,12 @@
  */
 
 import { aiEventClient } from '../../event-client.js'
-import type { SummarizeAdapter } from './adapter'
 import type {
   StreamChunk,
   SummarizationOptions,
   SummarizationResult,
 } from '../../types'
+import type { SummarizeAdapter } from './adapter'
 
 // ===========================
 // Activity Kind
@@ -65,6 +65,10 @@ export interface SummarizeActivityOptions<
    * @default false
    */
   stream?: TStream
+  /**
+   * Telemetry data for tracking and monitoring.
+   */
+  telemetry?: SummarizationOptions['telemetry']
 }
 
 // ===========================
@@ -174,7 +178,7 @@ export function summarize<
 async function runSummarize(
   options: SummarizeActivityOptions<SummarizeAdapter<string, object>, false>,
 ): Promise<SummarizationResult> {
-  const { adapter, text, maxLength, style, focus } = options
+  const { adapter, text, maxLength, style, focus, telemetry } = options
   const model = adapter.model
   const requestId = createId('summarize')
   const inputLength = text.length
@@ -185,6 +189,7 @@ async function runSummarize(
     provider: adapter.name,
     model,
     inputLength,
+    telemetry,
     timestamp: startTime,
   })
 
@@ -194,6 +199,7 @@ async function runSummarize(
     maxLength,
     style,
     focus,
+    telemetry,
   }
 
   const result = await adapter.summarize(summarizeOptions)
@@ -208,6 +214,7 @@ async function runSummarize(
     inputLength,
     outputLength,
     duration,
+    telemetry,
     timestamp: Date.now(),
   })
 
@@ -231,6 +238,7 @@ async function* runStreamingSummarize(
     maxLength,
     style,
     focus,
+    telemetry: options.telemetry,
   }
 
   // Use real streaming if the adapter supports it
@@ -280,9 +288,9 @@ export function createSummarizeOptions<
 }
 
 // Re-export adapter types
+export { BaseSummarizeAdapter } from './adapter'
 export type {
+  AnySummarizeAdapter,
   SummarizeAdapter,
   SummarizeAdapterConfig,
-  AnySummarizeAdapter,
 } from './adapter'
-export { BaseSummarizeAdapter } from './adapter'
diff --git a/packages/typescript/ai/src/event-client.ts b/packages/typescript/ai/src/event-client.ts
index b76d67055..b3567b2d4 100644
--- a/packages/typescript/ai/src/event-client.ts
+++ b/packages/typescript/ai/src/event-client.ts
@@ -1,5 +1,5 @@
 import { EventClient } from '@tanstack/devtools-event-client'
-import type { MessagePart, ToolCall } from './types'
+import type { MessagePart, TelemetrySettings, ToolCall } from './types'
 
 /**
  * Tool call states - track the lifecycle of a tool call
@@ -44,6 +44,7 @@ interface BaseEventContext {
   model?: string
   systemPrompts?: Array<string>
   options?: Record<string, unknown>
+  telemetry?: TelemetrySettings
   modelOptions?: Record<string, unknown>
   toolNames?: Array<string>
   messageCount?: number
diff --git a/packages/typescript/ai/src/types.ts b/packages/typescript/ai/src/types.ts
index 7bd3c52d9..e27f0707e 100644
--- a/packages/typescript/ai/src/types.ts
+++ b/packages/typescript/ai/src/types.ts
@@ -1,5 +1,34 @@
 import type { StandardJSONSchemaV1 } from '@standard-schema/spec'
 
+/**
+ * Type for telemetry metadata values.
+ *
+ * This type is intended to be replaced by OpenTelemetry AttributeType in the future.
+ */
+export type TelemetryMetadataValue =
+  | string
+  | number
+  | boolean
+  | Array<null | undefined | string>
+  | Array<null | undefined | number>
+  | Array<null | undefined | boolean>
+
+/**
+ * Telemetry data for tracking and debugging.
+ */
+export type TelemetrySettings = {
+  /**
+   * Identifier for the specific function or operation being tracked.
+   */
+  functionId?: string
+
+  /**
+   * Arbitrary key-value pairs for tracking context.
+   * Common keys: userId, sessionId, billingAccount, environment, etc.
+   */
+  metadata?: Record<string, TelemetryMetadataValue>
+}
+
 /**
  * Tool call states - track the lifecycle of a tool call
  */
@@ -617,6 +646,10 @@ export interface TextOptions<
    * - Gemini: Not directly available in TextProviderOptions
    */
   metadata?: Record<string, any>
+  /**
+   * Telemetry data for tracking and monitoring.
+   */
+  telemetry?: TelemetrySettings
   modelOptions?: TProviderOptionsForModel
   request?: Request | RequestInit
 
@@ -912,6 +945,10 @@ export interface SummarizationOptions {
   maxLength?: number
   style?: 'bullet-points' | 'paragraph' | 'concise'
   focus?: Array<string>
+  /**
+   * Telemetry data for tracking and monitoring.
+   */
+  telemetry?: TelemetrySettings
 }
 
 export interface SummarizationResult {
@@ -946,6 +983,10 @@ export interface ImageGenerationOptions<
   size?: string
   /** Model-specific options for image generation */
   modelOptions?: TProviderOptions
+  /**
+   * Telemetry data for tracking and monitoring.
+   */
+  telemetry?: TelemetrySettings
 }
 
 /**
@@ -1001,6 +1042,10 @@ export interface VideoGenerationOptions<
   duration?: number
   /** Model-specific options for video generation */
   modelOptions?: TProviderOptions
+  /**
+   * Telemetry data for tracking and monitoring.
+   */
+  telemetry?: TelemetrySettings
 }
 
 /**
@@ -1066,6 +1111,10 @@ export interface TTSOptions<TProviderOptions extends object = object> {
   speed?: number
   /** Model-specific options for TTS generation */
   modelOptions?: TProviderOptions
+  /**
+   * Telemetry data for tracking and monitoring.
+   */
+  telemetry?: TelemetrySettings
 }
 
 /**
@@ -1109,6 +1158,10 @@ export interface TranscriptionOptions<
   responseFormat?: 'json' | 'text' | 'srt' | 'verbose_json' | 'vtt'
   /** Model-specific options for transcription */
   modelOptions?: TProviderOptions
+  /**
+   * Telemetry data for tracking and monitoring.
+   */
+  telemetry?: TelemetrySettings
 }
 
 /**