Gitea's workflow_dispatch endpoint returns 204 No Content with no Location header. DispatchWorkflow required that header, so every successful dispatch errored with "missing Location header" and never yielded a run ID — making the tool unusable for CAD dispatch. - DispatchWorkflow now returns error-only; 204 = success, no Location needed. Body already carried ref+inputs; kept and covered by test. - Tool snapshots the newest existing workflow_dispatch run before dispatch, then polls ListWorkflowRuns after and returns the newest run with ID above that baseline (avoids returning a stale prior run). Falls back to an honest "dispatched, run not yet registered" result rather than failing. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>