WebMCP tools can now emit PostHog's standard `$mcp_tool_call` event through posthog-js. The implementation adds privacy redaction and omits arguments/results, but only works for sites that enable the feature and initialise instrumentation before registering tools.
WebMCP is no longer a Chrome-only browser experiment: Microsoft Edge now has its own active origin trial, while ChatGPT’s built-in browser and WordPress Playground show agent-client and platform implementation paths.
A new public MCP endpoint lets agents search without an API key and complete shopper-authorised purchases. It is separate from the Global Catalog REST API retirement and earlier browser-only WebMCP checkout; webhooks are not available at launch.
RuntimeWire found a generic `genui` message path, a server-directed widget refresh endpoint and 467 versioned Learning Block manifests inside OpenAI’s Codex desktop client. The material development is not another visualization feature: it is evidence of a reusable interface layer beneath conversational answers, with important limits around what is actually public or enabled.