feat: add usage/fingerprint metadata to KurtResult for KurtVertexAI adapter

packages/kurt-vertex-ai/spec/generateNaturalLanguage.spec.ts

@@ -8,7 +8,7 @@ describe("KurtVertexAI generateNaturalLanguage", () => {
         prompt: "Say hello!",
       })
     )
-    expect(result.text).toEqual("Hello! How can I assist you today?")
+    expect(result.text).toEqual("Hello! 👋  😊\n")
   })
 
   test("writes a haiku with high temperature", async () => {
@@ -24,9 +24,10 @@ describe("KurtVertexAI generateNaturalLanguage", () => {
     )
     expect(result.text).toEqual(
       [
-        "Moon paints silver path,",
-        "Water sings to sleeping stones,",
-        "Night sighs on the wind.",
+        "Moon bathes silver stream,",
+        "Whispers flow through sleeping wood,",
+        "Stones dream in the dark.",
+        "",
       ].join("\n")
     )
   })

packages/kurt-vertex-ai/spec/generateWithOptionalTools.spec.ts

@@ -50,7 +50,7 @@ describe("KurtVertexAI generateWithOptionalTools", () => {
         ],
       })
     )
-    expect(result.text).toEqual("That's about 324.")
+    expect(result.text).toEqual("That's about 324. \n")
   })
 
   test("calculator (with parallel tool calls)", async () => {
@@ -123,7 +123,7 @@ describe("KurtVertexAI generateWithOptionalTools", () => {
       [
         "1. 8026256882 divided by 3402398 is 2359.",
         "2. 1185835515 divided by 348263 is 3405.",
-        "3. 90135094495 minus 89944954350 is 190140145.",
+        "3. 90135094495 minus 89944954350 is 190140145. ",
         "",
       ].join("\n")
     )

packages/kurt-vertex-ai/spec/snapshots.ts

@@ -44,7 +44,7 @@ export async function snapshotAndMock<T>(
   // Here's the data structure we will use to snapshot a request/response cycle.
   const snapshot: {
     step1Request?: VertexAIRequest
-    step2RawChunks: VertexAIResponseChunkCandidate[]
+    step2RawChunks: VertexAIResponseChunk[]
     step3KurtEvents: KurtStreamEvent<T>[]
   } = {
     step1Request: undefined,
@@ -75,7 +75,7 @@ export async function snapshotAndMock<T>(
               snapshot.step2RawChunks = savedRawChunks
               async function* generator(): AsyncIterable<VertexAIResponseChunk> {
                 for await (const rawChunk of savedRawChunks) {
-                  yield { candidates: [rawChunk] }
+                  yield rawChunk
                 }
               }
               return { stream: generator() }
@@ -95,9 +95,14 @@ export async function snapshotAndMock<T>(
               for await (const rawEvent of response.stream) {
                 const candidate = rawEvent.candidates?.at(0)
                 if (candidate) {
-                  const rawChunk = { ...candidate }
+                  const partialCandidate = { ...candidate }
                   // biome-ignore lint/performance/noDelete: we don't care about performance in this test code
-                  delete rawChunk.safetyRatings
+                  delete partialCandidate.safetyRatings
+
+                  const rawChunk = {
+                    candidates: [partialCandidate],
+                    usageMetadata: rawEvent.usageMetadata,
+                  }
                   snapshot.step2RawChunks.push(rawChunk)
                 }
 

packages/kurt-vertex-ai/spec/snapshots/KurtVertexAI_generateNaturalLanguage_says_hello.yaml

@@ -8,24 +8,37 @@ step1Request:
       parts:
         - text: Say hello!
 step2RawChunks:
-  - content:
-      role: model
-      parts:
-        - text: Hello!
-    index: 0
-  - content:
-      role: model
-      parts:
-        - text: " How can I assist you today?"
-    index: 0
-  - content:
-      role: model
-      parts:
-        - text: ""
-    finishReason: STOP
-    index: 0
+  - candidates:
+      - content:
+          role: model
+          parts:
+            - text: Hello
+        index: 0
+  - candidates:
+      - content:
+          role: model
+          parts:
+            - text: |
+                ! 👋  😊
+        index: 0
+  - candidates:
+      - content:
+          role: model
+          parts:
+            - text: ""
+        finishReason: STOP
+        index: 0
+    usageMetadata:
+      promptTokenCount: 3
+      candidatesTokenCount: 7
+      totalTokenCount: 10
 step3KurtEvents:
-  - chunk: Hello!
-  - chunk: " How can I assist you today?"
+  - chunk: Hello
+  - chunk: |
+      ! 👋  😊
   - finished: true
-    text: Hello! How can I assist you today?
+    text: |
+      Hello! 👋  😊
+    metadata:
+      totalInputTokens: 3
+      totalOutputTokens: 7

packages/kurt-vertex-ai/spec/snapshots/KurtVertexAI_generateNaturalLanguage_writes_a_haiku_with_high_temperature.yaml

@@ -8,41 +8,52 @@ step1Request:
       parts:
         - text: Compose a haiku about a mountain stream at night.
 step2RawChunks:
-  - content:
-      role: model
-      parts:
-        - text: Moon
-    index: 0
-  - content:
-      role: model
-      parts:
-        - text: |2-
-             paints silver path,
-            Water sings to sleeping stones,
-            Night sighs on the
-    index: 0
-  - content:
-      role: model
-      parts:
-        - text: |2-
-             wind.
-    index: 0
-  - content:
-      role: model
-      parts:
-        - text: ""
-    finishReason: STOP
-    index: 0
+  - candidates:
+      - content:
+          role: model
+          parts:
+            - text: Moon
+        index: 0
+  - candidates:
+      - content:
+          role: model
+          parts:
+            - text: |2-
+                 bathes silver stream,
+                Whispers flow through sleeping wood,
+                Stones dream
+        index: 0
+  - candidates:
+      - content:
+          role: model
+          parts:
+            - text: |2
+                 in the dark.
+        index: 0
+  - candidates:
+      - content:
+          role: model
+          parts:
+            - text: ""
+        finishReason: STOP
+        index: 0
+    usageMetadata:
+      promptTokenCount: 10
+      candidatesTokenCount: 23
+      totalTokenCount: 33
 step3KurtEvents:
   - chunk: Moon
   - chunk: |2-
-       paints silver path,
-      Water sings to sleeping stones,
-      Night sighs on the
-  - chunk: |2-
-       wind.
+       bathes silver stream,
+      Whispers flow through sleeping wood,
+      Stones dream
+  - chunk: |2
+       in the dark.
   - finished: true
-    text: |-
-      Moon paints silver path,
-      Water sings to sleeping stones,
-      Night sighs on the wind.
+    text: |
+      Moon bathes silver stream,
+      Whispers flow through sleeping wood,
+      Stones dream in the dark.
+    metadata:
+      totalInputTokens: 10
+      totalOutputTokens: 23

packages/kurt-vertex-ai/spec/snapshots/KurtVertexAI_generateStructuredData_says_hello_(response_format_1).yaml

@@ -25,17 +25,32 @@ step1Request:
       allowed_function_names:
         - structured_data
 step2RawChunks:
-  - content:
-      role: model
-      parts:
-        - functionCall:
-            name: structured_data
-            args:
-              say: hello
-    index: 0
+  - candidates:
+      - content:
+          role: model
+          parts:
+            - functionCall:
+                name: structured_data
+                args:
+                  say: hello
+        index: 0
+  - candidates:
+      - content:
+          role: model
+          parts:
+            - text: ""
+        finishReason: STOP
+        index: 0
+    usageMetadata:
+      promptTokenCount: 16
+      candidatesTokenCount: 5
+      totalTokenCount: 21
 step3KurtEvents:
   - chunk: '{"say":"hello"}'
   - finished: true
     text: '{"say":"hello"}'
     data:
       say: hello
+    metadata:
+      totalInputTokens: 16
+      totalOutputTokens: 5

packages/kurt-vertex-ai/spec/snapshots/KurtVertexAI_generateStructuredData_says_hello_(response_format_2).yaml

@@ -25,19 +25,34 @@ step1Request:
       allowed_function_names:
         - structured_data
 step2RawChunks:
-  - content:
-      role: model
-      parts:
-        - functionCall:
-            name: call
-            args:
-              function: structured_data
-              say: hello
-              extension: default_api
-    index: 0
+  - candidates:
+      - content:
+          role: model
+          parts:
+            - functionCall:
+                name: call
+                args:
+                  function: structured_data
+                  say: hello
+                  extension: default_api
+        index: 0
+  - candidates:
+      - content:
+          role: model
+          parts:
+            - text: ""
+        finishReason: STOP
+        index: 0
+    usageMetadata:
+      promptTokenCount: 16
+      candidatesTokenCount: 8
+      totalTokenCount: 24
 step3KurtEvents:
   - chunk: '{"say":"hello"}'
   - finished: true
     text: '{"say":"hello"}'
     data:
       say: hello
+    metadata:
+      totalInputTokens: 16
+      totalOutputTokens: 8

packages/kurt-vertex-ai/spec/snapshots/KurtVertexAI_generateStructuredData_says_hello_(response_format_3).yaml

@@ -25,18 +25,33 @@ step1Request:
       allowed_function_names:
         - structured_data
 step2RawChunks:
-  - content:
-      role: model
-      parts:
-        - functionCall:
-            name: call
-            args: { say: "hello" }
-            function: structured_data
-            extension: default_api"
-    index: 0
+  - candidates:
+      - content:
+          role: model
+          parts:
+            - functionCall:
+                name: call
+                args: { say: "hello" }
+                function: structured_data
+                extension: default_api"
+        index: 0
+  - candidates:
+      - content:
+          role: model
+          parts:
+            - text: ""
+        finishReason: STOP
+        index: 0
+    usageMetadata:
+      promptTokenCount: 16
+      candidatesTokenCount: 8
+      totalTokenCount: 21
 step3KurtEvents:
   - chunk: '{"say":"hello"}'
   - finished: true
     text: '{"say":"hello"}'
     data:
       say: hello
+    metadata:
+      totalInputTokens: 16
+      totalOutputTokens: 8