n8n 2.43.0 blocks publishing of broken workflows

n8n released version 2.43.0 on October 6, 2026, focused on production hardening: the editor now refuses to publish workflows with unconnected required node inputs, policy checks extend to CLI import and execute commands, and MCP availability rules apply to error workflows. The update also fixes duplicate agent message deliveries and agent session pagination on SQLite.

• Publishing is blocked when required node inputs are unconnected (commit 5e28ff8, #37265)
• Policy checks now apply to CLI import and execute commands (#39714)
• MCP availability rules extended to error workflows (#39885)
• Fixed duplicate agent message deliveries (#39794) and SQLite session pagination (#39802)