chore: bump effect to 4.0.7

packages/effect/package.json

@@ -68,7 +68,7 @@
     "@types/node": "^26.6.3",
     "@vitest/coverage-v8": "^5.0.5",
     "ai": "^7.0.155",
-    "effect": "4.0.6",
+    "effect": "4.0.7",
     "publint": "^0.3.25",
     "tsup": "^9.0.0",
     "tsx": "^4.23.15",

packages/effect/src/language-model.ts

@@ -498,6 +498,15 @@ const toolResultToV4 = (part: Prompt.ToolResultPart): LanguageModelV4ToolResultP
   let output: LanguageModelV4ToolResultOutput;
   if (part.isFailure) {
     output = { type: "error-json", value };
+  } else if (part.modelOutput !== undefined) {
+    // A tool's `toModelOutput` mapping (effect 4.0.7+) replaces the result
+    // sent to the model.
+    output = {
+      type: "content",
+      value: part.modelOutput.map((item) =>
+        item.type === "text" ? { type: "text", text: item.text } : filePartToV4(item),
+      ),
+    };
   } else {
     output = { type: "json", value };
   }

packages/effect/test/language-model.test.ts

@@ -178,6 +178,78 @@ describe("generateText", () => {
     ]);
   });
 
+  it("sends a tool's model output in place of its serialized result", async () => {
+    let captured: LanguageModelV4CallOptions | undefined;
+    const model = fakeModel({
+      doGenerate: async (options) => {
+        captured = options;
+        return {
+          content: [{ type: "text", text: "ok" }],
+          finishReason: { unified: "stop", raw: undefined },
+          usage: USAGE,
+          warnings: [],
+        };
+      },
+    });
+
+    const messages: Array<Prompt.MessageEncoded> = [
+      { role: "user", content: [{ type: "text", text: "Take a screenshot." }] },
+      {
+        role: "assistant",
+        content: [{ type: "tool-call", id: "call_1", name: "screenshot", params: {} }],
+      },
+      {
+        role: "tool",
+        content: [
+          {
+            type: "tool-result",
+            id: "call_1",
+            name: "screenshot",
+            isFailure: false,
+            result: { path: "/tmp/shot.png" },
+            modelOutput: [
+              { type: "text", text: "Screenshot" },
+              {
+                type: "file",
+                mediaType: "image/png",
+                fileName: "shot.png",
+                data: "iVBORw0KGgo=",
+              },
+            ],
+            providerExecuted: false,
+          },
+        ],
+      },
+    ];
+
+    await Effect.runPromise(
+      Effect.flatMap(service(model), (m) => m.generateText({ prompt: messages })),
+    );
+
+    expect(captured?.prompt.at(-1)).toEqual({
+      role: "tool",
+      content: [
+        {
+          type: "tool-result",
+          toolCallId: "call_1",
+          toolName: "screenshot",
+          output: {
+            type: "content",
+            value: [
+              { type: "text", text: "Screenshot" },
+              {
+                type: "file",
+                mediaType: "image/png",
+                filename: "shot.png",
+                data: { type: "data", data: "iVBORw0KGgo=" },
+              },
+            ],
+          },
+        },
+      ],
+    });
+  });
+
   it("sends tool definitions as JSON schema and resolves tool calls", async () => {
     const GetWeather = Tool.make("get_weather", {
       description: "Look up the current weather",