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[Client] Speak the 2026-07-28 lifecycle (#456)

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* [Client] Speak the 2026-07-28 lifecycle

On that revision the client opens with server/discover instead of
initialize, stamps each request's _meta with the protocol version, its own
capabilities and client info, and sends the standard Mcp-Method / Mcp-Name /
Mcp-Param-* headers an intermediary routes on. ToolCatalog is what knows,
from the tool list, which arguments a call has to mirror.

An input_required result is answered rather than surfaced: InputRequestResolver
asks the host's elicitation, sampling and roots handlers and retries the same
request carrying inputResponses and the requestState the server sent.

McpHeader holds the header names and the =?base64?…?= sentinel, so the two
sides no longer keep their own copies of the same rules.

* Fix CI baseline drift and address Copilot review findings

Drop stale expected-failure entries the new client fixture now passes.

Copilot review: fix McpHeader round-trip for a wrapper-shaped literal,
encode empty/numeric-keyed inputResponses as a JSON object, stop the
incident example repeating side effects on MRTR retry, and reset
ToolCatalog on reconnect instead of carrying the previous server's
verdicts.

* Skip DualEraExampleTestCase on PHP 8.1

PHP_CLI_SERVER_WORKERS does not reliably fork multiple php -S
workers there (php/php-src#9400), reproducing the single-worker
deadlock the extra workers exist to avoid.
This commit is contained in:
Christopher Hertel 2026-08-19 02:41:02 +02:00 • committed by GitHub
commit 8c06dcecc6
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1 changed files with 2443 additions and 248 deletions
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13
tests/Integration/HandshakeTest.php
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@ -59,11 +59,16 @@ final class HandshakeTest extends IntegrationTestCase
yield 'server pins a newer revision' => [ProtocolVersion::V2024_11_05, ProtocolVersion::V2025_11_25, ProtocolVersion::V2025_11_25];
yield 'both pin the same revision' => [ProtocolVersion::V2025_06_18, ProtocolVersion::V2025_06_18, ProtocolVersion::V2025_06_18];
// Neither side reaches the modern era through `initialize`, so
// configuring it falls back to the handshake set on both ends.
yield 'client configured modern' => [ProtocolVersion::V2026_07_28, null, $latest];
// A modern client does not negotiate at all: it skips the handshake and
// states its revision on every request, so what it was configured with
// is what it reports. This server never answers `server/discover`, so
// there is nothing to reconcile against either.
yield 'client configured modern' => [ProtocolVersion::V2026_07_28, null, ProtocolVersion::V2026_07_28];
yield 'both configured modern' => [ProtocolVersion::V2026_07_28, ProtocolVersion::V2026_07_28, ProtocolVersion::V2026_07_28];
// The server end still falls back: a handshake-era client offered a
// revision, and `initialize` cannot answer with a modern one.
yield 'server configured modern' => [ProtocolVersion::V2025_06_18, ProtocolVersion::V2026_07_28, ProtocolVersion::V2025_06_18];
yield 'both configured modern' => [ProtocolVersion::V2026_07_28, ProtocolVersion::V2026_07_28, $latest];
}
#[TestDox('the handshake carries the server identity to the client')]