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Commit889cb6c

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properly convert custom / mcp tools to anthropic cua format (#1103)
WhyCustom AI SDK tools and MCP integrations weren't working properly withAnthropic CUA - parameters were empty {} and tools weren't tracked.What Changed- Convert Zod schemas to JSON Schema before sending to Anthropic (usingzodToJsonSchema)- Track custom tool calls in the actions array- Silence "Unknown tool name" warnings for custom toolsTest PlanTested with examples file. Parameters passed correctly ({"city":"San Francisco"} instead of {})Custom tools execute and appear in actions arrayNo warnings
1 parente0e6b30 commit889cb6c

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-11
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2 files changed

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‎.changeset/short-mirrors-switch.md‎

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@@ -0,0 +1,5 @@
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---
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"@browserbasehq/stagehand":patch
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---
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patch custom tool support in anthropic cua client

‎lib/agent/AnthropicCUAClient.ts‎

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@@ -13,6 +13,7 @@ import { LogLine } from "@/types/log";
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import{AgentScreenshotProviderError}from"@/types/stagehandErrors";
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importAnthropicfrom"@anthropic-ai/sdk";
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import{ToolSet}from"ai";
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import{zodToJsonSchema}from"zod-to-json-schema";
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import{AgentClient}from"./AgentClient";
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import{mapKeyToPlaywright}from"./utils/cuaKeyMapping";
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import{compressConversationImages}from"./utils/imageCompression";
@@ -275,6 +276,12 @@ export class AnthropicCUAClient extends AgentClient {
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level:2,
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});
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stepActions.push(action);
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}elseif(this.tools&&toolUseItem.nameinthis.tools){
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stepActions.push({
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type:"custom_tool",
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tool:toolUseItem.name,
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input:toolUseItem.input,
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}asAgentAction);
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}
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}elseif(block.type==="text"){
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// Safe to cast here since we've verified it's a text block
@@ -436,17 +443,16 @@ export class AnthropicCUAClient extends AgentClient {
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if(this.tools&&Object.keys(this.tools).length>0){
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constcustomTools=Object.entries(this.tools).map(([name,tool])=>{
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// Convert Zod schema to proper JSON schema format for Anthropic
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letinputSchema=tool.parameters;
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// Ensure the schema has the required 'type' field at root level
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if(typeofinputSchema==="object"&&inputSchema!==null){
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if(!("type"ininputSchema)){
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inputSchema={
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type:"object",
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...inputSchema,
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};
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}
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}
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constjsonSchema=zodToJsonSchema(tool.parameters)as{
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properties?:Record<string,unknown>;
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required?:string[];
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};
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constinputSchema={
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type:"object",
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properties:jsonSchema.properties||{},
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required:jsonSchema.required||[],
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};
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return{
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name,
@@ -890,6 +896,8 @@ export class AnthropicCUAClient extends AgentClient {
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type:name,
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params:input,
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};
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}elseif(this.tools&&nameinthis.tools){
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returnnull;
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}
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console.warn(`Unknown tool name:${name}`);

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