>>> [!note] Migrated issue <!-- Drupal.org comment --> <!-- Migrated from issue #3580162. --> Reported by: [scott_euser](https://www.drupal.org/user/3267594) Related to !50 >>> <h3 id="summary-problem-motivation">Problem/Motivation</h3> <p><del>It seems like without a semver increase this module can be compatible with 3.x JSON-RPC</del>. Updating the module to be compatible with the 3.x JSON-RPC has breaking changes that are not backwards compatible, so would require a semver jump to 2.x here in the MCP module (which will also resolve the test warning e.g. see <a href="https://git.drupalcode.org/project/mcp/-/pipelines">https://git.drupalcode.org/project/mcp/-/pipelines</a>)</p> <h4 id="summary-steps-reproduce">Steps to reproduce</h4> <p>Checkout jsonrpc 3.x branch<br> See fatal error when attempting to enable MCP module</p> <h3 id="summary-proposed-resolution">Proposed resolution</h3> <ol> <li>Adding static return type + composer.json update makes it compatible<del>, while still remaining compatible with 2.x branch</del></li> <li>Update all plugins to use JSON RPC object and set matching return types with JSON RPC parent class</li> </ol> <h3 id="summary-remaining-tasks">Remaining tasks</h3> <p>MR</p> <h3 id="summary-ui-changes">User interface changes</h3> <p>N/A</p> <h3 id="summary-api-changes">API changes</h3> <p>N/A</p> <h3 id="summary-data-model-changes">Data model changes</h3> <p>N/A</p>