feat (ai/core): forward abort signal to tools

.changeset/olive-roses-bathe.md

@@ -0,0 +1,5 @@
+---
+'ai': patch
+---
+
+feat (ai/core): forward abort signal to tools

content/docs/03-ai-sdk-core/15-tools-and-tool-calling.mdx

@@ -195,6 +195,35 @@ const result = await generateText({
 });
 ```
 
+## Abort Signals
+
+The abort signals from `generateText` and `streamText` are forwarded to the tool execution.
+You can access them in the second parameter of the `execute` function and e.g. abort long-running computations or forward them to fetch calls inside tools.
+
+```ts highlight="12,15"
+import { z } from 'zod';
+import { generateText, tool } from 'ai';
+
+const result = await generateText({
+  model: yourModel,
+  tools: {
+    weather: tool({
+      description: 'Get the weather in a location',
+      parameters: z.object({
+        location: z.string().describe('The location to get the weather for'),
+      }),
+      execute: async ({ location }, { abortSignal }) => {
+        return fetch(
+          `https://api.weatherapi.com/v1/current.json?q=${location}`,
+          { signal: abortSignal }, // forward the abort signal
+        );
+      },
+    }),
+  },
+  prompt: 'What is the weather in San Francisco?',
+});
+```
+
 ## Prompt Engineering with Tools
 
 When you create prompts that include tools, getting good results can be tricky as the number and complexity of your tools increases.

content/docs/07-reference/01-ai-sdk-core/01-generate-text.mdx

@@ -282,7 +282,7 @@ To see `generateText` in action, check out [these examples](#examples).
             {
               name: 'execute',
               isOptional: true,
-              type: 'async (parameters) => any',
+              type: 'async (parameters: T, options: { abortSignal: AbortSignal }) => JSONValue',
               description:
                 'An async function that is called with the arguments from the tool call and produces a result. If not provided, the tool will not be executed automatically.',
             },

content/docs/07-reference/01-ai-sdk-core/02-stream-text.mdx

@@ -284,7 +284,7 @@ To see `streamText` in action, check out [these examples](#examples).
             {
               name: 'execute',
               isOptional: true,
-              type: 'async (parameters) => any',
+              type: 'async (parameters: T, options: { abortSignal: AbortSignal }) => JSONValue',
               description:
                 'An async function that is called with the arguments from the tool call and produces a result. If not provided, the tool will not be executed automatically.',
             },

content/docs/07-reference/01-ai-sdk-core/20-tool.mdx

@@ -63,7 +63,7 @@ export const weatherTool = tool({
             {
               name: 'execute',
               isOptional: true,
-              type: 'async (parameters) => any',
+              type: 'async (parameters: T, options: { abortSignal: AbortSignal }) => JSONValue',
               description:
                 'An async function that is called with the arguments from the tool call and produces a result. If not provided, the tool will not be executed automatically.',
             },

packages/ai/core/generate-text/generate-text.test.ts

@@ -728,6 +728,47 @@ describe('options.providerMetadata', () => {
   });
 });
 
+describe('options.abortSignal', () => {
+  it('should forward abort signal to tool execution', async () => {
+    const abortController = new AbortController();
+    const toolExecuteMock = vi.fn().mockResolvedValue('tool result');
+
+    const generateTextPromise = generateText({
+      model: new MockLanguageModelV1({
+        doGenerate: async () => ({
+          ...dummyResponseValues,
+          toolCalls: [
+            {
+              toolCallType: 'function',
+              toolCallId: 'call-1',
+              toolName: 'tool1',
+              args: `{ "value": "value" }`,
+            },
+          ],
+        }),
+      }),
+      tools: {
+        tool1: {
+          parameters: z.object({ value: z.string() }),
+          execute: toolExecuteMock,
+        },
+      },
+      prompt: 'test-input',
+      abortSignal: abortController.signal,
+    });
+
+    // Abort the operation
+    abortController.abort();
+
+    await generateTextPromise;
+
+    expect(toolExecuteMock).toHaveBeenCalledWith(
+      { value: 'value' },
+      { abortSignal: abortController.signal },
+    );
+  });
+});
+
 describe('telemetry', () => {
   let tracer: MockTracer;
 

packages/ai/core/generate-text/generate-text.ts

@@ -369,6 +369,7 @@ functionality that can be fully encapsulated in the provider.
                 tools,
                 tracer,
                 telemetry,
+                abortSignal,
               });
 
         // token usage:
@@ -537,11 +538,13 @@ async function executeTools<TOOLS extends Record<string, CoreTool>>({
   tools,
   tracer,
   telemetry,
+  abortSignal,
 }: {
   toolCalls: ToToolCallArray<TOOLS>;
   tools: TOOLS;
   tracer: Tracer;
   telemetry: TelemetrySettings | undefined;
+  abortSignal: AbortSignal | undefined;
 }): Promise<ToToolResultArray<TOOLS>> {
   const toolResults = await Promise.all(
     toolCalls.map(async toolCall => {
@@ -569,7 +572,7 @@ async function executeTools<TOOLS extends Record<string, CoreTool>>({
         }),
         tracer,
         fn: async span => {
-          const result = await tool.execute!(toolCall.args);
+          const result = await tool.execute!(toolCall.args, { abortSignal });
 
           try {
             span.setAttributes(

packages/ai/core/generate-text/run-tools-transformation.ts

@@ -66,12 +66,14 @@ export function runToolsTransformation<TOOLS extends Record<string, CoreTool>>({
   toolCallStreaming,
   tracer,
   telemetry,
+  abortSignal,
 }: {
   tools: TOOLS | undefined;
   generatorStream: ReadableStream<LanguageModelV1StreamPart>;
   toolCallStreaming: boolean;
   tracer: Tracer;
   telemetry: TelemetrySettings | undefined;
+  abortSignal: AbortSignal | undefined;
 }): ReadableStream<SingleRequestTextStreamPart<TOOLS>> {
   let canClose = false;
   const outstandingToolCalls = new Set<string>();
@@ -195,7 +197,7 @@ export function runToolsTransformation<TOOLS extends Record<string, CoreTool>>({
                 }),
                 tracer,
                 fn: async span =>
-                  tool.execute!(toolCall.args).then(
+                  tool.execute!(toolCall.args, { abortSignal }).then(
                     (result: any) => {
                       toolResultsStreamController!.enqueue({
                         ...toolCall,

packages/ai/core/generate-text/stream-text.test.ts

@@ -2686,6 +2686,52 @@ describe('options.providerMetadata', () => {
   });
 });
 
+describe('options.abortSignal', () => {
+  it('should forward abort signal to tool execution during streaming', async () => {
+    const abortController = new AbortController();
+    const toolExecuteMock = vi.fn().mockResolvedValue('tool result');
+
+    const result = await streamText({
+      model: new MockLanguageModelV1({
+        doStream: async () => ({
+          stream: convertArrayToReadableStream([
+            {
+              type: 'tool-call',
+              toolCallType: 'function',
+              toolCallId: 'call-1',
+              toolName: 'tool1',
+              args: `{ "value": "value" }`,
+            },
+            {
+              type: 'finish',
+              finishReason: 'stop',
+              usage: { promptTokens: 10, completionTokens: 20 },
+            },
+          ]),
+          rawCall: { rawPrompt: 'prompt', rawSettings: {} },
+        }),
+      }),
+      tools: {
+        tool1: {
+          parameters: z.object({ value: z.string() }),
+          execute: toolExecuteMock,
+        },
+      },
+      prompt: 'test-input',
+      abortSignal: abortController.signal,
+    });
+
+    convertAsyncIterableToArray(result.fullStream);
+
+    abortController.abort();
+
+    expect(toolExecuteMock).toHaveBeenCalledWith(
+      { value: 'value' },
+      { abortSignal: abortController.signal },
+    );
+  });
+});
+
 describe('telemetry', () => {
   let tracer: MockTracer;
 

packages/ai/core/generate-text/stream-text.ts

@@ -366,6 +366,7 @@ need to be added separately.
               toolCallStreaming,
               tracer,
               telemetry,
+              abortSignal,
             }),
             warnings,
             rawResponse,

packages/ai/core/tool/tool.ts

@@ -32,8 +32,16 @@ Use descriptions to make the input understandable for the language model.
   /**
 An async function that is called with the arguments from the tool call and produces a result.
 If not provided, the tool will not be executed automatically.
+
+@args is the input of the tool call.
+@options.abortSignal is a signal that can be used to abort the tool call.
    */
-  execute?: (args: inferParameters<PARAMETERS>) => PromiseLike<RESULT>;
+  execute?: (
+    args: inferParameters<PARAMETERS>,
+    options: {
+      abortSignal?: AbortSignal;
+    },
+  ) => PromiseLike<RESULT>;
 }
 
 /**