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Unity ships official Codex plugin with 31 engineer-written skills

Unity released an official Codex plugin (Sept 16) with 31 skills written by Unity engineers—covering UI Toolkit, URP, IAP, multiplayer, and a unity-cli for Editors and packages—so Codex checks the project and verifies results against current APIs. It requires Unity 6+, installs in two commands, and follows Unity’s earlier Claude Code plugin.

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Claude Code: build-eval and hillclimb tune agents without overfitting

Anthropic’s claude api skill adds /claude api build eval (guided eval design in your repo) and /claude api hillclimb (one change per round tuning with a held out set to catch overfitting). On an internal support bench, hillclimb lifted search accuracy from 74.4% to 98.9% while cutting cost to about one fifth…

Anthropic

Claude Code 2.1.285: disable WebFetch, admins lock API providers

Claude Code 2.1.285 (npm Sept 29) adds CLAUDE CODE DISABLE WEB FETCH to turn off WebFetch and a managed allowedProviders policy so admins can lock machines to Anthropic, Bedrock, Vertex, Foundry, or a cloud gateway. It also ships claude desktop , claude plugin configure , and a fix for URL passwords leaking past log redaction…

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OpenAI MCP Events: ChatGPT plugins react via signed webhooks

OpenAI’s DevDay MCP Events let ChatGPT plugins subscribe to MCP server updates (messages, comments, status) and trigger automations over verified signed HTTPS webhooks. Servers need MCP 2.0 (protocol 2026 07 28) with events/list, events/subscribe, and events/unsubscribe; polling and streaming aren’t supported…

OpenAI

Anthropic: open-weight GLM-5.3 near Mythos on end-to-end exploits

Anthropic finds Z.ai’s freely downloadable GLM 5.3 builds end to end exploits at rates close to Claude Mythos Preview (50/410 vs 56/410 on ExploitBench), while simple jailbreaks and weight abliteration bypass its safeguards 64–100% of the time—unlike safeguarded Claude models in the same tests…

Anthropic

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