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deepseek-harness/packages/mcp/mcp-client/tests/fixture-server.ts
T

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/**
* Minimal MCP server over stdio for e2e testing of the dsh-mcp-client plugin.
* Registers controlled tools with predictable behavior for asserting edge cases.
*
* Run: node fixture-server.ts
*/
import { McpServer } from '@modelcontextprotocol/sdk/server/mcp.js'
import { StdioServerTransport } from '@modelcontextprotocol/sdk/server/stdio.js'
import { z } from 'zod'
const server = new McpServer(
{ name: 'fixture-server', version: '1.0.0' },
{ capabilities: { tools: { listChanged: true } } },
)
server.registerTool('add', {
title: 'Add Tool',
description: 'Adds two numbers.',
inputSchema: { a: z.number().describe('First number'), b: z.number().describe('Second number') },
}, async args => ({
content: [{ type: 'text', text: String(args.a + args.b) }],
}))
server.registerTool('greet', {
title: 'Greet Tool',
description: 'Greets a person by name.',
inputSchema: { name: z.string().describe('Name to greet') },
}, async args => ({
content: [{ type: 'text', text: `Hello, ${args.name}!` }],
}))
server.registerTool('fail', {
title: 'Fail Tool',
description: 'Always returns an error.',
inputSchema: {},
}, async () => ({
content: [{ type: 'text', text: 'Something went wrong' }],
isError: true,
}))
server.registerTool('image', {
title: 'Image Tool',
description: 'Returns an image content block.',
inputSchema: {},
}, async () => ({
content: [
{ type: 'text', text: 'Here is an image:' },
{ type: 'image', data: 'iVBORw0KGgo=', mimeType: 'image/png' },
{ type: 'text', text: 'End of image.' },
],
}))
// Dotted name: legal in MCP, illegal in the DeepSeek function-name contract.
// Exercises the bridge's normalize-and-hash public-name path end to end.
server.registerTool('admin.reset', {
title: 'Admin Reset Tool',
description: 'Tool with a dotted name (normalization test).',
inputSchema: {},
}, async () => ({
content: [{ type: 'text', text: 'reset done' }],
}))
const transport = new StdioServerTransport()
await server.connect(transport)