### What does this PR do?
Type of change: new feature
Packages the existing ModelOpt agent skills as installable Codex and
Claude plugins:
- Adds a repo-scoped Codex marketplace and Claude-compatible
marketplace.
- Adds the canonical `plugins/modelopt/` plugin tree and manifests.
- Moves the skill tree into the plugin and keeps `.agents/skills` as a
compatibility symlink.
- Adds a minimal `common` placeholder skill required by Codex
validation.
- Documents installation from this repository.
### Usage
```bash
codex plugin marketplace add NVIDIA/Model-Optimizer
```
Then open `/plugins`, select the `modelopt` marketplace, and install
`modelopt`.
For Claude Code:
```bash
claude plugin marketplace add https://github.com/NVIDIA/Model-Optimizer.git
claude plugin install modelopt@modelopt
```
### Testing
- Codex plugin validator
- `claude plugin validate . --strict`
- `claude plugin validate plugins/modelopt --strict`
1. Install the marketplace plugin with Codex and Claude from an
unrelated temporary workspace.
2. Exercise packaged evaluation helpers, a day-0 gate, and the shared
remote helper from that workspace.
3. Run `uv run --frozen --extra dev python -m pytest -q
plugins/modelopt/skills/day0-release/tests/test_gates.py
plugins/modelopt/skills/benchmark-model-kernels/tests`.
4. Run pre-commit hooks for all changed files.
### Before your PR is "*Ready for review*"
- Is this change backward compatible?: ✅
- If you copied code from any other sources or added a new PIP
dependency, did you follow guidance in `CONTRIBUTING.md`: N/A
- Did you write any new necessary tests?: ✅ — added a plugin-path
validator; existing focused skill tests and installed-plugin smoke tests
pass.
- Did you update Changelog?: N/A — agent tooling and distribution only.
- Did you get Claude approval on this PR?: N/A
### Additional Information
Skills remain available through `.agents/skills`; bundled helpers are
packaged under the plugin and resolved from `$SKILL_DIR` so installed
workflows do not depend on the current workspace.
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **New Features**
* Added installable ModelOpt plugins for Claude Code and Codex.
* Added skills for PTQ, deployment, evaluation, monitoring, debugging,
benchmarking, MLflow access, EAGLE3 workflows, and release management.
* Added deployment helpers, evaluation recipes, checkpoint validation,
and release-gating tools.
* **Documentation**
* Expanded setup, credential, SLURM, benchmarking, deployment,
evaluation, troubleshooting, and workspace guidance.
* Added installation instructions and updated agent-skill discovery
guidance.
* **Maintenance**
* Updated skill references and compatibility links for reliable use
across supported plugin environments.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
---------
Signed-off-by: Chad Voegele <cvoegele@nvidia.com>
