Datasette Agent 0.4a0 Enables Custom JavaScript Tools

Datasette Agent 0.4a0 has been released, introducing a new capability that allows plugins to provide tools for executing custom JavaScript in the user's browser. This development, announced by Simon Willison on 31st July 2026, simplifies the integration of browser-based interactions within Datasette Agent. The update is part of ongoing efforts to enhance the platform's extensibility. Willison also mentioned a sponsorship option for $10 per month, which includes a curated email digest of significant LLM developments. The release is documented on his blog, with the source URL provided.