Using OpenCode as a fallback agent for Antigravity

Today I was confused by Antigravity errors about high load on their services. It made my work impossible even with the cheapest model Gemini 3 Flash.   Some time ago I heard something about the [OpenCode](https://opencode.a). And it was the time to try it! I've installed the opencode in my system by `brew install anomalyco/tap/opencode` and respective extension from the marketplace.  I have a good documentation inside the repo like described in the article [Specification-First Agentic Development: A Methodology for Structured, Traceable AI-Assisted Development](https://dev.to/holgerleichsenring/specification-first-agentic-development-a-methodology-for-structured-traceable-ai-assisted-la). So the default free OpenCode model `Big Pickle` performed planning, reviewing and coding stage well. But then I realized that it was working without taking into the account system instruction and rules which I had for Antigravity. So I've performed calls of Antigravity assurance workflows (like [here](https://dev.to/gdg/antigravity-my-approach-to-deliver-the-most-assured-value-for-the-least-money-3iip) and [here](https://dev.to/gdg/ai-powered-repository-security-check-with-antigravity-workflow-5hee)) right from the OpenCode chat and it performed them perfectly. As I have a lot of workflows for linting, security check of diff and the whole repo, and especially external self-made security gateway I was sure that the quality of code produced by the OpenCode was good enough and aligned with my codebase. The only thing I can mention is a redundant file was left after some iterations of testing. But it can be fixed by a good review right after MR creation. So seems the OpenCode is a good fallback for cases when Google servers are experiencing problems. Also it can by used to save tokens for some kind of tasks.