In May 2026, Helix editor delivery focused on expanding language tooling by adding first-class support for the Concerto Modelling Language. This enables .cto data-model files to be authored, highlighted, and navigated within the editor, aligning with smart legal contracts and business network modeling needs. The work enhances developer productivity and reduces modeling errors by providing integrated syntax highlighting, indentation, and local scope tracking.

March 2026 monthly summary for macvim development: Delivered a feature enhancement to Concerto Modelling Language support by adding detection of .cto files as the Concerto filetype. This fixes a long-standing gap where .cto files were unrecognized and enables proper syntax highlighting and editing workflows in macvim. The change was implemented via patch 9.2.0217 in commit 68f9dedba46b4e6625459d94342a2e2c7f5b17b7, with references to the Accord Project language spec and tree-sitter grammar. This work closes issue #19760 and involved collaboration with Jamie Shorten and Christian Brabandt. Overall, the improvement enhances developer productivity when working with Concerto-based smart contracts and modeling data, aligning with business goals.