Primary Manifestation

When using any Google provider model (e.g., google/gemini-3-flash-preview, google/gemini-2.5-pro), the model generates and delivers complete text responses, but OpenClaw’s session remains in a processing state indefinitely.

Diagnostic Log Output

diagnostic: stalled session ... reason=active_work_without_progress
lane task error: lane=main durationMs=134161 error="FailoverError: LLM request timed out."

Timeout Behavior

The system waits the full 120-second idle watchdog interval before:

• Emitting the FailoverError: LLM request timed out error
• Triggering provider failover to the next model in the chain
• Or failing the session entirely

Affected Models

• google/gemini-3-flash-preview
• google/gemini-3.1-pro-preview
• google/gemini-2.5-pro
• Any other Gemini family model via @google/genai SDK

Contrasting Behavior

Anthropic models (claude-opus-4-7) and DeepSeek models (deepseek-v4-pro) on the same host correctly detect stream completion and close turns immediately without triggering the idle watchdog.

Reproduction Trigger

The issue occurs on 100% of observed Google generation attempts—every streaming response triggers the 120-second stall regardless of response length or complexity.

Technical Analysis

The root cause lies in the bundled @google/genai SDK version 1.52.0 shipped with OpenClaw 2026.5.7. This version contains a bug in its Server-Sent Events (SSE) stream handling implementation.

Failure Sequence

1. Stream Initialization: OpenClaw initiates a generateContentStream request using the @google/genai SDK's streaming API.
2. Data Transmission: Google's infrastructure correctly transmits all response chunks via SSE, including the terminal chunk containing finishReason: "STOP".
3. Connection Closure: Google's servers close the underlying HTTP connection after transmitting the final chunk (no [DONE] marker sent).
4. SDK Bug: The SDK version 1.52.0 fails to propagate the stream termination signal to OpenClaw's for await loop, leaving the iterator in a perpetual pending state.
5. Watchdog Trigger: After 120 seconds without progress detection, OpenClaw's idle watchdog aborts the request with FailoverError: LLM request timed out.

SDK Defect Details

The @google/genai@1.52.0 bug is officially documented in Google’s official changelog for version 2.0.0:

Bug Fix: timeout not functioning

This indicates the issue was known and fixed in subsequent releases.

Why Other Providers Work

Anthropic and DeepSeek providers either:

• Send explicit [DONE] SSE terminators
• Properly signal stream completion through their SDK implementations
• Use different connection management that correctly triggers iterator completion

Resolution: Upgrade @google/genai SDK

The fix requires upgrading the @google/genai package from version 1.52.0 to version 2.0.1 or later within OpenClaw’s installation directory.

Step 1: Locate OpenClaw’s Installation Directory

bash npm root -g

Typical output:

/usr/local/lib/node_modules

Step 2: Navigate to the OpenClaw Package Directory

bash cd /usr/local/lib/node_modules/openclaw

Step 3: Check Current @google/genai Version

bash npm list @google/genai

Expected output (before fix):

└── @google/genai@1.52.0

Step 4: Upgrade the SDK

bash npm install @google/genai@2.0.1 –save

Expected output:

added 1 package, and removed 1 package in 3.42s
  1 package changed (1 upgrade)

Step 5: Verify Installation

bash npm list @google/genai

Expected output (after fix):

└── @google/genai@2.0.1

Step 6: Restart OpenClaw

bash

Stop any running OpenClaw processes

pkill -f openclaw

Restart OpenClaw

openclaw start

or

openclaw agent [options]

Alternative: Project-Local Installation

If you maintain a local fork or have project-level npm installation:

bash cd /path/to/your/openclaw/project npm install @google/genai@2.0.1 –save npm rebuild

Before/After Configuration Reference

Method 1: Interactive CLI Test

bash openclaw chat –model google/gemini-3-flash-preview

Enter a simple prompt:

Hello, respond with just "Test successful".

Expected Behavior (After Fix):

• Response generates within seconds
• Session immediately returns to input state
• No “stalled session” or timeout warnings in logs

Method 2: Direct SDK Verification

bash node -e " const { GoogleGenerativeAI } = require(’@google/generai’); const genAI = new GoogleGenerativeAI(process.env.GEMINI_API_KEY); const model = genAI.getGenerativeModel({ model: ‘gemini-2.0-flash’ });

(async () => { const result = await model.generateContentStream(‘Say hello in one word’); let text = ‘’; for await (const chunk of result.stream) { text += chunk.text(); console.log(‘Chunk received:’, chunk.text()); } console.log(‘Stream completed. Total text:’, text); console.log(‘Verification: SUCCESS - Stream closed immediately’); })(); "

Expected Output:

Chunk received: Hello
Stream completed. Total text: Hello
Verification: SUCCESS - Stream closed immediately

Method 3: Log Monitoring

Start OpenClaw with verbose logging and monitor for stall indicators:

bash openclaw agent –verbose 2>&1 | grep -E “(stalled|FailoverError|LLM request timed out)”

Expected Result: No matches (empty output) after sending prompts to Google models.

Method 4: Timing Verification

bash time openclaw chat –model google/gemini-3-flash-preview –exec “Say ‘done’” «< “test”

Expected Result: Command completes in under 10 seconds (previously would hang for 120+ seconds before timeout).

Negative Verification (Confirming Bug is Fixed)

Ensure these error patterns no longer appear:

diagnostic: stalled session ... reason=active_work_without_progress
lane task error: lane=main durationMs=134161 error="FailoverError: LLM request timed out."

Pitfall 1: Global npm Directory Permissions

Issue: Insufficient permissions to write to global node_modules.

Symptom:

npm ERR! EACCES: permission denied, access '/usr/local/lib/node_modules'

Resolution:

sudo npm install @google/genai@2.0.1 --save
# OR
mkdir ~/.npm-global
npm config set prefix '~/.npm-global'
export PATH=~/.npm-global/bin:$PATH
npm install @google/genai@2.0.1 --save -g

Pitfall 2: Multiple OpenClaw Installations

Issue: User has multiple OpenClaw installations (global + local), upgrading the wrong instance.

Symptom: Issue persists after upgrade despite apparent success.

Resolution:

# Find all OpenClaw installations
find / -name "openclaw" -type d 2>/dev/null | grep node_modules

# Verify which instance is active
which openclaw
npm list -g openclaw

Pitfall 3: Cached Module State

Issue: Node.js module caching retains old SDK after upgrade.

Symptom: Behavior unchanged even after successful upgrade.

Resolution:

# Clear Node module cache
rm -rf node_modules/.cache

# Restart OpenClaw with fresh process
pkill -f openclaw
openclaw start

Pitfall 4: Package Lock Inconsistency

Issue: Package-lock.json reverts package version on next install.

Symptom: Bug returns after npm install or system updates.

Resolution:

# Pin the version in package.json
# Ensure line reads: "@google/genai": "^2.0.1"

# Regenerate lockfile
npm install
npm ls @google/genai

Pitfall 5: Docker Container Environment

Issue: SDK upgrade in host system doesn’t affect Docker container.

Symptom: Bug persists in containerized OpenClaw deployments.

Resolution:

# For Docker-based deployments, add to Dockerfile:
RUN npm install @google/genai@2.0.1 --save

# Or mount local node_modules:
docker run -v /usr/local/lib/node_modules:/usr/local/lib/node_modules openclaw

Pitfall 6: API Key Scope

Issue: Using API key with restrictions that cause connection drops.

Symptom: Timeout still occurs but for different reason (network/auth).

Verification:

# Test API key directly
curl -H "Authorization: Bearer $GEMINI_API_KEY" \
  "https://generativelanguage.googleapis.com/v1beta/models/gemini-2.0-flash:generateContentStream?key=$GEMINI_API_KEY" \
  -X POST -H "Content-Type: application/json" \
  -d '{"contents":[{"parts":[{"text":"hi"}]}]}'