Google Open Source Blog · Oct 22, 2026 · 8:24 PM

Google open-sources its Elephant-Goldfish plugin: design with one long agent session, critique with stateless ones

Released Oct 22 under Apache 2.0 and used daily by thousands of Googlers, the plugin has a long-context "Elephant" session co-design a no-code Markdown spec (egm-brainstorm, egm-draft), then sends zero-context "Goldfish" sessions to explain it back, attack it, and give a go/no-go before any code is written (egm-review). It targets Antigravity first, with other environments to follow.

Read at opensource.googleblog.com

Google Antigravity

Agentic development platform with IDE, CLI, SDK, and local agents

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