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[Server] Let a server say how long its answers stay fresh (#450)

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Every cacheable result went out as ttlMs 0, private — the letter of
SEP-2549 and none of its point, with no way to change it. CachePolicy adds
a default and per-method overrides; a resource can override per read. The
conservative default stands, because public means a shared cache may serve
one caller's answer to another.
This commit is contained in:
Christopher Hertel 2026-08-18 23:53:16 +02:00 • committed by GitHub
commit 7dd72d82de
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1 changed files with 320 additions and 16 deletions
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4
src/Server/Stateless/StatelessProtocol.php
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@ -31,6 +31,7 @@ use Mcp\Server\Handler\Request\RequestHandlerInterface;
use Mcp\Server\Protocol;
use Mcp\Server\Session\InMemorySessionStore;
use Mcp\Server\Session\Session;
use Mcp\Server\Wire\CachePolicy;
use Mcp\Server\Wire\Rev2026Codec;
use Mcp\Server\Wire\WireCodecInterface;
use Psr\Log\LoggerInterface;
@ -98,8 +99,9 @@ final class StatelessProtocol
?WireCodecInterface $codec = null,
private readonly ?StandardHeaderValidator $headerValidator = null,
private readonly ?RequestStateCodec $requestStateCodec = null,
?CachePolicy $cachePolicy = null,
) {
$this->codec = $codec ?? new Rev2026Codec($configuration->serverInfo);
$this->codec = $codec ?? new Rev2026Codec($configuration->serverInfo, $cachePolicy);
if (null === $this->headerValidator) {
// Not fatal: a transport without a header layer — stdio — has