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[v1.x backport] Allow servers / clients to advertise extensions in the capability object (#1811)

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Den Delimarsky 2026-03-30 03:43:46 -07:00 • committed by GitHub
commit 5608e78dd0
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1 changed files with 77 additions and 2 deletions
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54
test/server/mcp.test.ts
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@ -198,6 +198,60 @@ describe.each(zodTestMatrix)('$zodVersionLabel', (entry: ZodMatrixEntry) => {
message: 'Completed step 3 of 3'
});
});
/***
* Test: Extensions capability registration
*/
test('should register and advertise server extensions capability', async () => {
const mcpServer = new McpServer({
name: 'test server',
version: '1.0'
});
const client = new Client({
name: 'test client',
version: '1.0'
});
mcpServer.server.registerCapabilities({
extensions: {
'io.modelcontextprotocol/test-extension': { listChanged: true }
}
});
const [clientTransport, serverTransport] = InMemoryTransport.createLinkedPair();
await Promise.all([client.connect(clientTransport), mcpServer.connect(serverTransport)]);
const capabilities = client.getServerCapabilities();
expect(capabilities?.extensions).toBeDefined();
expect(capabilities?.extensions?.['io.modelcontextprotocol/test-extension']).toEqual({ listChanged: true });
});
test('should advertise client extensions capability to server', async () => {
const mcpServer = new McpServer({
name: 'test server',
version: '1.0'
});
const client = new Client(
{
name: 'test client',
version: '1.0'
},
{
capabilities: {
extensions: {
'io.modelcontextprotocol/test-extension': { streaming: true }
}
}
}
);
const [clientTransport, serverTransport] = InMemoryTransport.createLinkedPair();
await Promise.all([client.connect(clientTransport), mcpServer.connect(serverTransport)]);
const capabilities = mcpServer.server.getClientCapabilities();
expect(capabilities?.extensions).toBeDefined();
expect(capabilities?.extensions?.['io.modelcontextprotocol/test-extension']).toEqual({ streaming: true });
});
});
describe('ResourceTemplate', () => {