convertGeminiToolName lowercased any unmapped Claude tool, so Skill and
SlashCommand became an invalid `skill`/`slashcommand` tool name. Gemini CLI
has no such built-in tool, so frontmatter validation failed (tools.N: Invalid
tool name) and aborted the entire agent load — 22 of 34 GSD agents were dead
on Gemini.
Add Skill and SlashCommand to the same `return null` exclusion branch that
already handles AskUserQuestion, in both the canonical src converter and the
hand-maintained bin/install.js copy that runs on the live --gemini install
path. Antigravity reuses this converter (it runs on the Gemini backend) and is
intentionally covered by the same exclusion — it surfaces GSD skills via the
skill surface (SKILL.md), not the agent tools: allowlist — locked by an added
Antigravity regression test.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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