Simon Willison added a four-player online mode to his Battledrones game. Working from a single prompt, Claude Opus 5.5 created the new Compass Rose map and updated the WebSocket networking code so empty slots are filled by AI players.
Google has made Data Agent Kit generally available: a free set of MCP tools and 37 open-source skills that connect coding agents to more than fifteen Google Data Cloud services. It ships two kinds of guardrail, one where a skill asks the agent to stop and one where an IAM deny policy blocks the call outright.
A tutorial shows how to build an engineering copilot with Letta whose memory goes beyond the prompt. It covers inspectable core memory, vector-based archival retrieval, state shared between agents, custom tools and portable workflows.
Vercel's MCP server now has a submit_feedback tool that lets an agent send bug reports, friction reports and feature requests to the Vercel team, with structured context about the task. It requires sign-in and only sends feedback when the user asks for it.
Anthropic's open-source sandbox-runtime, the sandbox used by Claude Code, limits file and network access for agents, MCP servers and command-line tools. It relies on Seatbelt on macOS and bubblewrap on Linux rather than containers.
Vercel explains how its agent handles permissions on live systems: it first investigates a problem, then proposes a plan describing the actions it intends to take. The approach tries to avoid both overly broad access and a flood of approval prompts that users end up clicking through.