Summary

Context window not detected correctly from Ollama API - OpenClaw detects 4096 tokens instead of actual value (32768), preventing agent from responding

Steps to reproduce

1. Configure OpenClaw with Custom Provider pointing to local Ollama:

   • Run: openclaw configure
   • Provider: Custom Provider
   • API Base URL: http://127.0.0.1:11434/v1
   • Endpoint compatibility: OpenAI-compatible
   • Model ID: qwen2.5:32b (or qwen14b-32k)

2. Start the gateway:
   systemctl --user start openclaw-gateway

3. Launch TUI and send a message:
   openclaw tui
   Type: "bonjour"

4. Observe the error message

Expected behavior

OpenClaw should detect the correct context window from Ollama's API response (32768 tokens for qwen2.5:32b) and allow the agent to respond normally.

Verification that Ollama exposes the correct value:
curl -s http://127.0.0.1:11434/api/show -d '{"name":"qwen2.5:32b"}' | jq '.model_info."qwen2.context_length"'
Output: 32768

Actual behavior

OpenClaw detects 4096 tokens and blocks the agent with error:
"⚠️ Agent failed before reply: Model context window too small (4096 tokens). Minimum is 16000."

The TUI shows: tokens ?/4.1k instead of tokens ?/32k

Logs show:
warn agent/embedded low context window: custom-127-0-0-1-11434/qwen2.5:32b ctx=4096 (warn<32000) source=modelsConfig
error agent/embedded blocked model (context window too small): custom-127-0-0-1-11434/qwen2.5:32b ctx=4096 (min=16000) source=modelsConfig

Additional issue: Attempting to manually configure contextWindow fails:
openclaw config set agents.defaults.models.custom-127-0-0-1-11434/qwen2.5:32b.contextWindow 32768
Error: "Config validation failed: Unrecognized key: contextWindow"

Workaround: Using Qwen via Alibaba Cloud OAuth (qwen-portal provider) works correctly.

OpenClaw version

2026.2.21-2 (35a57bc)

Operating system

Ubuntu 24.04.4 LTS Node.js: v22.22.0 Ollama: Latest version Models tested: qwen2.5:32b, qwen14b-32k

Install method

No response

Logs, screenshots, and evidence

Impact and severity

No response

Additional information

No response