google/elephant-goldfish-model

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Thousands of Google engineers use EGM, an open-source plugin, to draft specs with deep-context agents and stress-test them with zero-context subagents before writing code.
Elephant holds your project context and drafts the specification. Goldfish reviewers examine the draft and referenced source material without the earlier conversation, helping expose unstated assumptions and blind spots. You make the architectural trade-offs and approve the specification before implementing.
Use it when a feature needs design decisions before implementation. For a small, clear bug fix, use your normal coding workflow.
## Install
Choose your coding agent. Install the complete plugin so its skills can read the reviewer prompts and document standards.
### Antigravity
sh
agy plugin install https://github.com/google/elephant-goldfish-model
### Claude Code
sh
claude plugin marketplace add google/elephant-goldfish-model
claude plugin install egm@egm
### Codex
sh
codex plugin marketplace add google/elephant-goldfish-model
codex plugin add egm@egm
Start a new session after installation. For Claude Cowork and ChatGPT Work, see the setup guide.
## Try your first design
Open your project in your coding agent and choose a feature that needs design decisions. This example adds webhook delivery: what should happen when a delivery fails, or the same event arrives twice?
Use the commands below in Antigravity. In Claude Code, use the /egm: prefix, for example /egm:egm-brainstorm. In Codex, select the corresponding EGM skill from the skill picker. Brainstorming and review require a session that can create fresh subagents.
Explore the idea
text
/egm-brainstorm Add webhook delivery to this project.
Discuss requirements and trade-offs with the agent. Fresh reviewers challenge the proposal, and the agent saves the agreed direction in conceptsbrief.md.
Draft the specification
text
/egm-draft
The agent turns the brief into designdraft.md, pausing after each section for your feedback in chat.
Review the draft
text
/egm-review designdraft.md
Use the draft path returned by the agent.
Fresh reviewers check the design, its clarity, its fit with the code, and its implementation plan. Choose which findings to address. When you approve the design, ask your coding agent to implement it.
See the workflow guide for the full process, including saving approved specifications under docs/designs/.
## How it works
Role Context Responsibility
Elephant Your project, requirements, and earlier decisions Explore the problem and draft the specification.
Goldfish The document and its referenced source material, without the earlier conversation Find missing assumptions, unclear requirements, and implementation risks.
You The goals and constraints that matter Resolve trade-offs, approve the design, and decide what to build.