feat(core): add embedded v2 session runtime and tool foundation (#30632)

packages/llm/test/provider/bedrock-converse.test.ts

@@ -5,6 +5,7 @@ import { Effect } from "effect"
 import { CacheHint, LLM, Message, ToolCallPart, ToolChoice } from "../../src"
 import { LLMClient } from "../../src/route"
 import { AmazonBedrock } from "../../src/providers"
+import * as BedrockConverse from "../../src/protocols/bedrock-converse"
 import { it } from "../lib/effect"
 import { fixedResponse } from "../lib/http"
 import {
@@ -82,6 +83,23 @@ describe("Bedrock Converse route", () => {
     }),
   )
 
+  it.effect("lowers chronological system updates to wrapped user text in order", () =>
+    Effect.gen(function* () {
+      const prepared = yield* LLMClient.prepare<BedrockConverse.BedrockConverseBody>(
+        LLM.request({
+          model,
+          messages: [Message.user("Before."), Message.system("Update."), Message.assistant("After.")],
+          cache: "none",
+        }),
+      )
+
+      expect(prepared.body.messages).toEqual([
+        { role: "user", content: [{ text: "Before." }, { text: "<system-update>\nUpdate.\n</system-update>" }] },
+        { role: "assistant", content: [{ text: "After." }] },
+      ])
+    }),
+  )
+
   it.effect("prepares tool config with toolSpec and toolChoice", () =>
     Effect.gen(function* () {
       const prepared = yield* LLMClient.prepare(
@@ -279,6 +297,41 @@ describe("Bedrock Converse route", () => {
     }),
   )
 
+  it.effect("preserves streamed reasoning signatures for continuation lowering", () =>
+    Effect.gen(function* () {
+      const body = eventStreamBody(
+        ["messageStart", { role: "assistant" }],
+        ["contentBlockDelta", { contentBlockIndex: 0, delta: { reasoningContent: { text: "Let me think." } } }],
+        ["contentBlockDelta", { contentBlockIndex: 0, delta: { reasoningContent: { signature: "sig_1" } } }],
+        ["contentBlockStop", { contentBlockIndex: 0 }],
+        ["messageStop", { stopReason: "end_turn" }],
+      )
+      const response = yield* LLMClient.generate(baseRequest).pipe(Effect.provide(fixedBytes(body)))
+      const reasoning = response.events.find((event) => event.type === "reasoning-end")
+
+      expect(reasoning).toEqual({
+        type: "reasoning-end",
+        id: "reasoning-0",
+        providerMetadata: { bedrock: { signature: "sig_1" } },
+      })
+
+      const prepared = yield* LLMClient.prepare<BedrockConverse.BedrockConverseBody>(
+        LLM.request({
+          model,
+          messages: [
+            Message.assistant([
+              { type: "reasoning", text: "Let me think.", providerMetadata: reasoning?.providerMetadata },
+            ]),
+          ],
+          cache: "none",
+        }),
+      )
+      expect(prepared.body.messages).toEqual([
+        { role: "assistant", content: [{ reasoningContent: { reasoningText: { text: "Let me think.", signature: "sig_1" } } }] },
+      ])
+    }),
+  )
+
   it.effect("emits provider-error for throttlingException", () =>
     Effect.gen(function* () {
       const body = eventStreamBody(