[Feature]: Add Official Support for Google Anti-Gravity (IDX)

[iamKhan79690]

Feature Category

Specify CLI (new commands, options)

Priority

Critical (blocking workflow)

Problem Statement

Problem

Currently, Spec-Kit-Plus supports Cursor, Claude, and Gemini, but lacks native support for Google's new Anti-Gravity (Project IDX) IDE. Users in IDX have to manually copy-paste templates.

Proposed Solution

Solution

I have implemented full support for Google Anti-Gravity. This includes:

1. A new antigravity agent option in the CLI.
2. Native MCP Server configuration (mcp.json) for slash commands (/specify, /plan) inside the IDX chat.
3. Optimized templates for the Gemini 3 model used by IDX.

Alternatives Considered

Implementation Details

• I have verified this locally in Google IDX.
• I have added the necessary build scripts to create-release-packages.sh.

I have a Pull Request ready to submit for this.

Examples/References

No response

Acceptance Criteria

No response

Breaking Change?

No

Additional Context

No response