mcp_server 2.0.0-beta7

Fixes cached resource content leaking between users, 503s from concurrent requests on one session, and stale stdio timestamps. Requires mcp/sdk ^0.9.

Upgrade notes

This release requires mcp/sdk 0.9. Update both packages together:

composer update drupal/mcp_server mcp/sdk --with-all-dependencies

Then rebuild caches with drush cr (or run drush updb). Several service definitions changed, and until the container is rebuilt, POST /mcp answers 500 with an ArgumentCountError.

mcp/sdk 0.9 validates a tool's structuredContent against its outputSchema. A result that doesn't match now comes back as a CallToolResult with isError: true instead of the value. Return new \stdClass() for an empty object, because [] is sent as an array. See the mcp/sdk changelog for the rest of 0.9.

Contributors (10)

ahmad-khalil-imagex, boychev, dcgoodwin, kotekirkitadze, mglaman, mortona2k, penyaskito, roborn, ronaldtebrake, scott falconer

Changelog

Issues: 5 issues resolved.

Changes since 2.0.0-beta6 (compare):

Bug

• fix: #3585955 Wait again for the session lock after a lost race
• fix: #3585953 Give each stdio request its own request time
• fix: #3585956 Vary cached resource content by each caller's contexts

Task

• test: #3585943 Move the JSON-RPC request builder into RequestTrait
• chore: #3585949 Require mcp/sdk ^0.9