Grok model crashes with "Cannot read properties of undefined (reading 'includes')"

Issue

After Anthropic API credits ran out, switching to Grok (xai/grok-4-1-fast-reasoning) now consistently throws a JavaScript error:

Cannot read properties of undefined (reading 'includes')

Timeline

1. Anthropic credits expired → started getting similar undefined errors
2. Switched to Grok → same "undefined.includes()" error appears
3. Gateway restart → error persists
4. Removed compat flags from Grok config → error persists
5. Sonnet/Haiku work fine → no errors

Evidence

• Sonnet (anthropic/claude-sonnet-4-5): ✅ Works perfectly
• Haiku (anthropic/claude-3-5-haiku-latest): ✅ Works in cron jobs
• Grok reasoning (xai/grok-4-1-fast-reasoning): ❌ Crashes with undefined error
• Grok non-reasoning (xai/grok-4-1-fast-non-reasoning): ❌ Crashes in cron jobs

Root Cause Hypothesis

The Anthropic credit failure corrupted some internal model resolution state. Even after:

• Refilling Anthropic credits
• Restarting gateway multiple times
• Removing Grok's compat flags (supportsDeveloperRole, supportsReasoningEffort)

The error persists when using ANY xAI model.

Gateway Logs

2026-02-08T22:15:50.007Z [agent:nested] session=agent:main:cron:23b5f86d-39e7-4236-979d-63e0592fe347 run=b232226c-1b3f-48bd-87a3-c9ab0b55aede channel=webchat Cannot read properties of undefined (reading 'includes')

Error appears in:

• Main chat session when switching to Grok
• Cron job isolated sessions using Grok non-reasoning

Config (Grok section)

"xai": {
  "baseUrl": "https://api.x.ai/v1",
  "apiKey": "XAI_API_KEY",
  "api": "openai-completions",
  "models": [
    {
      "id": "grok-4-1-fast-reasoning",
      "name": "Grok 4.1 Fast (Reasoning)",
      "api": "openai-completions",
      "reasoning": true,
      "input": ["text"],
      "cost": {
        "input": 0.2,
        "output": 0.5,
        "cacheRead": 0.05,
        "cacheWrite": 0.2
      },
      "contextWindow": 2000000,
      "maxTokens": 8192
    }
  ]
}

Environment

• Clawdbot version: 2026.1.24-3 (885167d)
• OS: macOS (arm64)
• Node: v25.5.0
• Auth: xai:manual token mode

Workaround

Switched to Sonnet as default, but this is burning credits faster. Grok is 15x cheaper ($0.20/$0.50 vs $3/$15 per M tokens).

Request

1. Fix the undefined .includes() error when using xAI models
2. Add better error handling/logging so we can see WHAT is undefined
3. Ensure provider errors don't corrupt model resolution state