## Summary
- add the Cursor-native plugin manifest and marketplace metadata with
inline AgentKey MCP OAuth
- add the root Gemini CLI extension manifest using Streamable HTTP and
native OAuth discovery
- add one root Antigravity plugin package for both Antigravity 2.0 and
Antigravity CLI
- configure Antigravity remote MCP with the required `serverUrl` field
and automatic OAuth discovery
- reuse the existing `skills/agentkey/` package across Gemini and
Antigravity without duplication
- keep endpoint and release/version synchronization across every client
- document Cursor, Gemini, Antigravity 2.0, and Antigravity CLI
onboarding in English and Chinese
## Validation
- `npx -y bats@1.12.0 tests/` (20/20 passing)
- `npx -y @google/gemini-cli@0.54.4 extensions validate .`
- verified all eight version values match `1.13.1`
- verified Claude, Codex, Cursor, Kimi, Gemini, and Antigravity MCP
endpoints remain synchronized
- verified the AgentKey endpoint advertises OAuth protected-resource
metadata
- verified the branch merges cleanly with `chainbase-labs/main`
## Antigravity validation boundary
The `agy` binary is not installed in the current environment, so a live
CLI install was not run. The plugin layout, manifest fields,
`serverUrl`, OAuth configuration, and shared Skill discovery are covered
by automated assertions against the current Antigravity documentation.
The documentation-prescribed `$schema` URL currently returns HTTP 404;
the manifest retains the prescribed value while tests enforce the
published schema locally.
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Co-authored-by: Allen <0xfatdog@gmail.com>
zzAllenn