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Fix a bug in AI SDK MCP Schema conversion #1890

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Fix a bug in AI SDK MCP Schema conversion #1890

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a4fa7d8
Fix a bug in AI SDK MCP Schema conversion
tconley1428 Jan 15, 2026
e5c572b
Fix type import
tconley1428 Jan 15, 2026
bcd1e91
Merge branch 'main' into ai_sdk_mcp_schema
tconley1428 Jan 16, 2026
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7 changes: 3 additions & 4 deletions packages/ai-sdk/src/activities.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -6,7 +6,7 @@ import type {
SharedV3Headers,
ProviderV3,
} from '@ai-sdk/provider';
import type { FlexibleSchema, ToolExecutionOptions } from 'ai';
import { asSchema, type Schema, type ToolExecutionOptions } from 'ai';
import { ApplicationFailure } from '@temporalio/common';
import type { McpClientFactories, McpClientFactory } from './mcp';

Expand Down Expand Up @@ -44,7 +44,7 @@ export type InvokeEmbeddingModelResult = EmbeddingModelV3Result;

export interface ListToolResult {
description?: string;
inputSchema: FlexibleSchema<unknown>;
inputSchema: Schema<unknown>;
}

export interface ListToolArgs {
Expand Down Expand Up @@ -100,13 +100,12 @@ function activitiesForName(name: string, mcpClientFactory: McpClientFactory): ob
const mcpClient = await mcpClientFactory(args.clientArgs);
try {
const tools = await mcpClient.tools();

return Object.fromEntries(
Object.entries(tools).map(([k, v]) => [
k,
{
description: v.description,
inputSchema: v.inputSchema,
inputSchema: asSchema(v.inputSchema),
},
])
);
Expand Down
12 changes: 9 additions & 3 deletions packages/ai-sdk/src/mcp.ts
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Original file line number Diff line number Diff line change
@@ -1,5 +1,4 @@
import { jsonSchema, type ToolSet } from 'ai';
import type { JSONSchema7 } from '@ai-sdk/provider';
import type { ToolSet } from 'ai';
import type { experimental_MCPClient as MCPClient } from '@ai-sdk/mcp';
import * as workflow from '@temporalio/workflow';
import type { ActivityOptions } from '@temporalio/workflow';
Expand Down Expand Up @@ -39,6 +38,7 @@ export class TemporalMCPClient {

const listActivity = activities[this.options.name + '-listTools'];
const tools: Record<string, ListToolResult> = await listActivity!({ clientArgs: this.options.clientArgs });

return Object.fromEntries(
Object.entries(tools).map(([toolName, toolResult]) => [
toolName,
Expand All @@ -52,7 +52,13 @@ export class TemporalMCPClient {
const callActivity = activities[this.options.name + '-callTool']!;
return await callActivity({ name: toolName, input, options, clientArgs: this.options.clientArgs });
},
inputSchema: jsonSchema(toolResult.inputSchema as JSONSchema7),
inputSchema: {
...toolResult.inputSchema,
_type: undefined,
validate: undefined,
[Symbol.for('vercel.ai.schema')]: true,
[Symbol.for('vercel.ai.validator')]: true,
},
type: 'dynamic',
},
])
Expand Down
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