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Implement MCP 2026-07-28 (#2286)

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Co-authored-by: Matt <77928207+mattzcarey@users.noreply.github.com>
Co-authored-by: Konstantin Konstantinov <KKonstantinov@users.noreply.github.com>
Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
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Felix Weinberger 2026-06-26 14:01:10 +01:00 • committed by GitHub
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78
examples/caching/client.ts Normal file
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/**
* Reads the cache hints emitted on cacheable results (2026-07-28 connections
* only) and asserts the client honours them: a still-fresh cached entry is
* served without a round trip.
*/
import { check, parseExampleArgs, siblingPath } from '@mcp-examples/shared';
import { Client, StreamableHTTPClientTransport } from '@modelcontextprotocol/client';
import { StdioClientTransport } from '@modelcontextprotocol/client/stdio';
interface Cacheable {
ttlMs?: number;
cacheScope?: 'public' | 'private';
}
async function callCount(client: Client, name: 'read-count' | 'request-count'): Promise<number> {
const r = await client.callTool({ name });
return Number((r.content[0] as { text: string }).text);
}
const { transport, url, era } = parseExampleArgs();
const client = new Client(
{ name: 'caching-example-client', version: '1.0.0' },
{ versionNegotiation: { mode: era === 'modern' ? 'auto' : 'legacy' } }
);
await (transport === 'stdio'
? client.connect(new StdioClientTransport({ command: 'npx', args: ['-y', 'tsx', siblingPath(import.meta.url, 'server.ts')] }))
: client.connect(new StreamableHTTPClientTransport(new URL(url))));
check.equal(client.getNegotiatedProtocolVersion(), '2026-07-28');
// The server stamps `tools/list` with `ttlMs: 30_000, cacheScope: 'public'`.
const tools = (await client.listTools()) as Cacheable & Awaited<ReturnType<typeof client.listTools>>;
check.equal(tools.ttlMs, 30_000);
check.equal(tools.cacheScope, 'public');
// `request-count` proves the wire was reached exactly once.
check.equal(await callCount(client, 'request-count'), 1);
// The second call is served from the response cache: the server-side
// `tools/list` counter is unchanged, and the result is a fresh copy of the
// held entry (so mutating it cannot reach the cache).
const toolsAgain = await client.listTools();
check.deepEqual(
toolsAgain.tools.map(t => t.name),
tools.tools.map(t => t.name)
);
check.equal(await callCount(client, 'request-count'), 1);
// `cacheMode: 'refresh'` always fetches and re-stores: the counter moves.
await client.listTools(undefined, { cacheMode: 'refresh' });
check.equal(await callCount(client, 'request-count'), 2);
const resources = (await client.listResources()) as Cacheable & Awaited<ReturnType<typeof client.listResources>>;
check.equal(resources.ttlMs, 5000);
check.equal(resources.cacheScope, 'public');
// `readResource`: the resource handler counts how many times it ran, and
// the `read-count` tool exposes that counter.
const read = (await client.readResource({ uri: 'config://app' })) as Cacheable & Awaited<ReturnType<typeof client.readResource>>;
check.equal(read.ttlMs, 60_000);
check.equal(read.cacheScope, 'private');
check.equal(await callCount(client, 'read-count'), 1);
// Within TTL, default `cacheMode: 'use'` → served from cache; the server
// handler does not run.
await client.readResource({ uri: 'config://app' });
check.equal(await callCount(client, 'read-count'), 1);
// `cacheMode: 'refresh'` always fetches and re-stores.
await client.readResource({ uri: 'config://app' }, { cacheMode: 'refresh' });
check.equal(await callCount(client, 'read-count'), 2);
// After the refresh the entry is fresh again — back to cache-served.
await client.readResource({ uri: 'config://app' });
check.equal(await callCount(client, 'read-count'), 2);
await client.close();