Backport: fix(anthropic): skip passing beta header for tool search tools (#13500)

vercel-ai-sdk[bot] · aayush-kapoor · web-flow · commit 41c6a56b6b75 · 2026-03-16T20:42:33.000Z
This is an automated backport of #13496 to the release-v6.0 branch. FYI @aayush-kapoor Co-authored-by: Aayush Kapoor <83492835+aayush-kapoor@users.noreply.github.com>
diff --git a/.changeset/odd-oranges-sparkle.md b/.changeset/odd-oranges-sparkle.md
@@ -0,0 +1,5 @@
+---
+'@ai-sdk/anthropic': patch
+---
+
+fix(anthropic): skip passing beta header for tool search tools
diff --git a/packages/anthropic/src/anthropic-messages-language-model.test.ts b/packages/anthropic/src/anthropic-messages-language-model.test.ts
@@ -3112,7 +3112,7 @@ describe('AnthropicMessagesLanguageModel', () => {
         it('should include advanced-tool-use beta header', async () => {
           expect(server.calls[0].requestHeaders).toMatchInlineSnapshot(`
             {
-              "anthropic-beta": "advanced-tool-use-2025-11-20,structured-outputs-2025-11-13",
+              "anthropic-beta": "structured-outputs-2025-11-13",
               "anthropic-version": "2023-06-01",
               "content-type": "application/json",
               "x-api-key": "test-api-key",
@@ -3218,7 +3218,7 @@ describe('AnthropicMessagesLanguageModel', () => {
         it('should include advanced-tool-use beta header', async () => {
           expect(server.calls[0].requestHeaders).toMatchInlineSnapshot(`
             {
-              "anthropic-beta": "advanced-tool-use-2025-11-20,structured-outputs-2025-11-13",
+              "anthropic-beta": "structured-outputs-2025-11-13",
               "anthropic-version": "2023-06-01",
               "content-type": "application/json",
               "x-api-key": "test-api-key",
diff --git a/packages/anthropic/src/anthropic-prepare-tools.test.ts b/packages/anthropic/src/anthropic-prepare-tools.test.ts
@@ -861,9 +861,7 @@ describe('prepareTools', () => {
 
       expect(result).toMatchInlineSnapshot(`
         {
-          "betas": Set {
-            "advanced-tool-use-2025-11-20",
-          },
+          "betas": Set {},
           "toolChoice": undefined,
           "toolWarnings": [],
           "tools": [
@@ -923,9 +921,7 @@ describe('prepareTools', () => {
 
       expect(result).toMatchInlineSnapshot(`
         {
-          "betas": Set {
-            "advanced-tool-use-2025-11-20",
-          },
+          "betas": Set {},
           "toolChoice": undefined,
           "toolWarnings": [],
           "tools": [
diff --git a/packages/anthropic/src/anthropic-prepare-tools.ts b/packages/anthropic/src/anthropic-prepare-tools.ts
@@ -322,7 +322,6 @@ export async function prepareTools({
           }
 
           case 'anthropic.tool_search_regex_20251119': {
-            betas.add('advanced-tool-use-2025-11-20');
             anthropicTools.push({
               type: 'tool_search_tool_regex_20251119',
               name: 'tool_search_tool_regex',
@@ -331,7 +330,6 @@ export async function prepareTools({
           }
 
           case 'anthropic.tool_search_bm25_20251119': {
-            betas.add('advanced-tool-use-2025-11-20');
             anthropicTools.push({
               type: 'tool_search_tool_bm25_20251119',
               name: 'tool_search_tool_bm25',

-Original file line number
+Diff line change
@@ @@ -0,0 +1,5 @@ @@
 +---
 +'@ai-sdk/anthropic': patch
 +---
++
 +fix(anthropic): skip passing beta header for tool search tools
Original file line number	Diff line number	Diff line change
`@@ -322,7 +322,6 @@ export async function prepareTools({`
`322`	`322`	`}`
`323`	`323`
`324`	`324`	`case 'anthropic.tool_search_regex_20251119': {`
`325`		`- betas.add('advanced-tool-use-2025-11-20');`
`326`	`325`	`anthropicTools.push({`
`327`	`326`	`type: 'tool_search_tool_regex_20251119',`
`328`	`327`	`name: 'tool_search_tool_regex',`
`@@ -331,7 +330,6 @@ export async function prepareTools({`
`331`	`330`	`}`
`332`	`331`
`333`	`332`	`case 'anthropic.tool_search_bm25_20251119': {`
`334`		`- betas.add('advanced-tool-use-2025-11-20');`
`335`	`333`	`anthropicTools.push({`
`336`	`334`	`type: 'tool_search_tool_bm25_20251119',`
`337`	`335`	`name: 'tool_search_tool_bm25',`