Fixed: "agent executor error: could not convert a single message before hitting truncation"

[ozgundogan-qa]

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The Problem / Sorun
When installing the full antigravity-awesome-skills repository (1200+ skills), Antigravity throws a termination error:

Error: agent executor error: could not convert a single message before hitting truncation

This happens because the metadata of 1200+ skills exceeds the model's initial context window (System Prompt). The agent tries to "read" all skill descriptions before the first message and fails immediately.

The Solution / Çözüm
The fix is to use Selective/Modular Installation instead of a full clone. By only installing specific bundles (like web-wizard or qa-testing), the system prompt remains lean and the agent works perfectly.

Step-by-Step Fix:

Clean up: Remove the existing overstuffed skills folder:
rm -rf ~/.gemini/antigravity/skills/*

Install via Bundles: Use the CLI to only fetch what you need. For example:
npx antigravity-awesome-skills --bundle web-wizard --bundle web-designer

Restart: Restart your IDE and Antigravity.

Why this works?
By reducing the number of active skills from 1200+ to ~30-40, you free up the context window for actual coding tasks and conversation history.

Relevant links or examples

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[sickn33]

Thanks for flagging this! It’s a known issue and it’s already fixed in PR #219 (“feat: Add skill filtering utility to fix Gemini token truncation”), merged on 2026‑03‑07. Update to the latest main (or the next release) and use the new skill-filter/bundle setup to avoid context overflow. Much appreciated!