Bug Description

When a model provider is registered via an OpenClaw plugin (not explicitly in models.providers), attempting to switch to that model directly via /model stepfun-plan/step-3.5-flash fails with:

Model \`stepfun-plan/step-3.5-flash\` is not allowed

However, creating an alias (step -> stepfun-plan/step-3.5-flash) makes it work correctly.

Steps to Reproduce

1. Install stepfun-openclaw-plugin (registers stepfun and stepfun-plan providers)
2. Try to switch model using /model stepfun-plan/step-3.5-flash
3. Observe error: "model not allowed"

Expected Behavior

Should be able to switch to stepfun-plan/step-3.5-flash without needing an alias.

Root Cause

This is the same root cause as issue #30152. In buildAllowedModelSet, plugin-registered providers are not recognized as "configured providers", so models from those providers are silently dropped from the allowlist.

The three conditions checked:

• isCliProvider() → false for API providers
• catalogKeys.has(key) → false (plugin models not in generated catalog)
• configuredProviders[providerKey] != null → false (provider registered via plugin, not explicit config)

Since none match, the model key is dropped.

Workaround

Add an alias in agents.defaults.models:

"models": {
  "stepfun-plan/step-3.5-flash": {
    "alias": "step"
  }
}

Then use /model step instead of /model stepfun-plan/step-3.5-flash.

Environment

• OpenClaw version: Latest
• Provider: stepfun-plan (via stepfun-openclaw-plugin)
• Model: step-3.5-flash
• Config: Provider registered via plugin, no explicit models.providers entry

Related Issues

• #30152 (same root cause, closed due to inactivity)
• #19774 (attempted fix, closed without merging)