[thisfilipe]

Summary

Fixes #100.

This PR adds support for OpenCode model variants in the V2 agent reviewer, allowing users to configure reasoning effort through the standard #variant syntax.

Previously, the reviewer passed modelID directly to the V2 session API, which expects the model ID and variant as separate properties.

Changes

• Update toModelRef() to split an optional #variant suffix and pass it as a separate property.
• Update fromModelRef() to preserve the originating session's selected variant when the reviewer inherits its model.
• Add regression tests covering explicitly configured and inherited variants.
• Document variant configuration and the OpenCode V1 limitation in the README.

Example

The following configuration is now supported on V2:

{
  "reviewer": {
    "agent": {
      "model": {
        "providerID": "opencode-go",
        "modelID": "deepseek-v4.1-flash#low"
      }
    }
  }
}

The plugin translates it into:

{
  "providerID": "opencode-go",
  "id": "deepseek-v4.1-flash",
  "variant": "low"
}

Compatibility

• Existing model configurations without variants remain unchanged.
• The change is limited to the OpenCode V2 session adapter.
• OpenCode V1 and external SDK runtimes retain their existing behavior.
• No new configuration property is required.

Testing

• Added regression test for explicitly configured model variants.
• Added regression test for inherited session variants.
• Verified the diff is isolated from unrelated fork changes.
• Run the test suite and type checks.
• Confirm behavior in a live OpenCode V2 session.
• Review CI results.

References

• [OpenCode model reference parser](https://github.com/anomalyco/opencode/blob/dev/packages/schema/src/model.ts)
• [OpenCode session model resolver](https://github.com/anomalyco/opencode/blob/dev/packages/core/src/session/runner/model.ts)