openclaw - 💡(How to fix) Fix OpenRouter model context window not auto-detected from provider catalog [1 comments, 2 participants]

No valid workaround found. The models block in agents.defaults.models does not accept contextWindow as a key (config validation error). The context1m param mentioned in docs also fails validation.

Fix Plan

To resolve the issue, we need to update the OpenClaw configuration to automatically resolve the contextWindow from the provider's API.

Here are the steps:

• Update the agents.defaults.models configuration to include the contextWindow key.
• Modify the OpenClaw code to fetch the context_length from the OpenRouter's /api/v1/models endpoint and update the contextWindow accordingly.

Example code snippet:

# Fetch model details from OpenRouter's API
model_details = requests.get(f"{openrouter_url}/api/v1/models/{model_name}").json()

# Update contextWindow in OpenClaw config
context_window = model_details.get("context_length", 200000)
openclaw_config["contextWindow"] = context_window

• Add error handling to ensure that the contextWindow is updated correctly even if the API call fails.

Verification

To verify that the fix worked, check the session status card in OpenClaw. It should display the correct contextWindow value (1M) instead of the hardcoded 200k fallback.

Extra Tips

• Ensure that the OpenRouter's API endpoint is correctly configured and accessible.
• Handle cases where the context_length is not available in the model details API response.
• Consider adding logging to track any errors that occur during the API call or config update.