Gemini Code Assist's Outline feature generates structured documentation drafts, function summaries, and architectural overviews directly from your code. It's one of the most practical features for code review workflows and technical documentation—but it's also one of the first to break when settings drift or credentials expire.
This guide covers every scenario where Outline stops working: from a silent failure after a VS Code update, to authentication errors in enterprise environments, to suggestions that generate but aren't useful. Each section includes actionable steps, not just explanations.
What Normal Operation Looks Like
Before troubleshooting, establish a baseline of expected behavior.
Prerequisites for Outline to work You need a valid Gemini Code Assist license (individual free tier or Enterprise). Your IDE must be a supported version: VS Code 1.80 or later, IntelliJ IDEA 2023.1 or later, or another supported JetBrains product. The file you're editing must be a supported language: Python, JavaScript, TypeScript, Java, Go, C++, Kotlin, Swift, C#, and others.
What to expect when it's working With a supported file open, you'll see a "Generate Outline" option in the editor context menu or command palette. After triggering it, a structured summary of the code—covering purpose, arguments, return values, and notable patterns—is generated within a few seconds to half a minute.
The Seven-Point Troubleshooting Checklist
Work through these in order. Each step resolves a distinct class of failure.
Check 1: Plugin Version
Outdated plugin versions are the most common cause of silently broken Outline functionality.
VS Code Open the Extensions sidebar and search for "Gemini Code Assist" or "Google Cloud Code." Compare your installed version against the latest available. If an update is available, install it and restart VS Code.
JetBrains IDEs
Go to Settings → Plugins → Installed, find "Google Cloud Code," and click "Update" if available. Restart the IDE after updating.
Check 2: Authentication Status
Expired authentication tokens cause Outline requests to fail without a clear error in the UI.
Re-authenticate in VS Code
Open the Command Palette (Ctrl+Shift+P / Cmd+Shift+P) and run Gemini Code Assist: Sign Out, then Gemini Code Assist: Sign In. Make sure you sign in with the Google account that has access to a project where Gemini Code Assist is enabled.
Check authentication via terminal
# Verify currently authenticated accounts
gcloud auth list
# Re-authenticate if needed
gcloud auth login
# Set application default credentials (for direct API use)
gcloud auth application-default loginCheck 3: Project and Billing Configuration
Incorrect project settings or a missing API activation will silently block Outline.
Verify in the Google Cloud Console Open console.cloud.google.com and confirm you're on the correct project. Check that Gemini for Google Cloud API is enabled, and that billing is active on the account.
# Confirm which project the CLI is using
gcloud config get-value project
# Check if the Gemini API is enabled
gcloud services list --enabled | grep cloudaicompanion
# Enable it if it's not listed
gcloud services enable cloudaicompanion.googleapis.comCheck 4: File Type and Size
Outline won't run on unsupported file types or files that are too large to process.
File size considerations The practical limit is roughly 500 KB to 1 MB depending on IDE settings. For larger files, select the specific class or function you want an outline for before triggering the feature.
File types that don't work
Binary files, auto-generated files inside node_modules or similar directories, and template files typically won't produce useful Outline output.
Check 5: Network and Proxy Settings
Corporate networks and VPNs sometimes block outbound requests to Google's API endpoints.
Test connectivity
curl -v https://cloudcode-pa.googleapis.com/ 2>&1 | head -20Configure VS Code to use a proxy
In settings.json:
{
"http.proxy": "http://your-proxy.company.com:8080",
"http.proxyAuthorization": null,
"http.proxyStrictSSL": false
}Check 6: IDE Cache
A corrupted IDE cache can cause extension features to stop responding without any clear error message.
Clear VS Code cache (macOS)
rm -rf ~/Library/Application\ Support/Code/Cache
rm -rf ~/Library/Application\ Support/Code/CachedData
rm -rf ~/Library/Application\ Support/Code/CachedExtensionVSIXsRestart VS Code after clearing. If the extension seems broken, also remove and reinstall it:
rm -rf ~/.vscode/extensions/google.cloudcode-*Clear JetBrains cache
Use File → Invalidate Caches → Invalidate and Restart.
Check 7: Read the Logs
If none of the above resolves it, the plugin logs will tell you exactly what's failing.
VS Code
Go to View → Output and select "Google Cloud Code" or "Gemini" from the dropdown.
# Common log errors and what they mean
PERMISSION_DENIED → Missing IAM role. Verify roles/cloudaicompanion.user is granted
QUOTA_EXCEEDED → Rate limit reached. Wait a few minutes and retry
UNAUTHENTICATED → Credentials expired. Re-authenticate via the Command Palette
Improving Outline Suggestion Quality
Once Outline is working, these practices will make the suggestions more useful.
Narrow the context before generating
Instead of running Outline on an entire file, select the specific function or class you want documented. Smaller, focused contexts produce more accurate and actionable outlines.
Use inline chat for targeted prompts
In VS Code, press Ctrl+I / Cmd+I to open inline chat with your selection active. Custom prompts consistently produce better results than the default Outline trigger.
# Effective inline chat prompts
"Document this function in JSDoc format, covering:
- what it does
- each parameter and its type
- the return value
- any side effects or exceptions"
"Explain the responsibility of this class, its main methods,
and the design pattern it implements, in plain English"
"List three architectural concerns about this code and
suggest concrete improvements for each"
Configure .aiexclude to reduce noise
Create a .aiexclude file at your project root to prevent sensitive or auto-generated files from entering the context:
# .aiexclude
*.env
*.key
*.pem
node_modules/
dist/
build/
.next/
vendor/
Use @workspace for cross-file outlines
In VS Code's chat panel, the @workspace context variable includes relevant files from across your project:
@workspace Give me a high-level architectural overview of this project,
focusing on the authentication flow, data access layer,
and how UI components communicate with the backend.
Enterprise-Specific Issues
If you're using Gemini Code Assist Enterprise, there are additional configuration points to check.
Organization policies A Google Workspace administrator may have restricted Gemini Code Assist features at the organization level. Check with your admin whether the feature is enabled in the Admin Console under "Gemini for Google Cloud."
Code Customization compatibility If your enterprise environment uses Code Customization (custom-trained models), those models may have limited compatibility with Outline. Contact Google Cloud support for guidance specific to your customization setup.
Service account permissions
For CI/CD integrations using a service account, both roles/cloudaicompanion.user and roles/cloudaicompanion.viewer must be granted.
# Grant required roles to a service account
gcloud projects add-iam-policy-binding YOUR_PROJECT_ID \
--member="serviceAccount:YOUR_SA@YOUR_PROJECT.iam.gserviceaccount.com" \
--role="roles/cloudaicompanion.user"
gcloud projects add-iam-policy-binding YOUR_PROJECT_ID \
--member="serviceAccount:YOUR_SA@YOUR_PROJECT.iam.gserviceaccount.com" \
--role="roles/cloudaicompanion.viewer"Write the Design First: Folding Outline into Your Pre-Implementation Workflow
The Outline feature is not only for fixing problems. In my own work as an indie developer, before I start a new feature I have made a habit of letting Outline sketch the overall map first, then dropping into implementation. When the structure is visible before I touch the keyboard, the amount of rework drops noticeably.
Draft a Design Skeleton from an Existing File
Select the file or class you plan to refactor and ask for a structural summary. You get back the responsibilities of each function and the flow of data as a bulleted list. That output works directly as the first draft of a design memo.
Organize this file's responsibilities, the public functions and their
roles, the internal state it holds, and its external dependencies
(API, DB, files) into a hierarchical bulleted list.
Make it readable as a "map of the design," not implementation detail.
Add your own judgment to that skeleton (why this split, where you plan to change things) and it becomes a design doc you can put up for review. Starting from a draft keeps your hands moving far better than starting from a blank page.
Move New Features in the Order "Overview, Split, Implement"
When you start a new feature straight from code, you often notice a structural distortion partway through and have to rebuild. If you let Outline draw the overall map first, settle the module boundaries, and only then descend into each implementation, that rework shrinks.
Propose a module structure for implementing this feature.
Show each module's responsibility, inputs and outputs, and dependencies,
and suggest the order to start implementing. Do not write code yet.
The trick is adding "Do not write code yet." Without it, an implementation comes back at the very moment you wanted to discuss the design, and your perspective gets dragged down into the details.
Use It as an Entry Point for Surveying a Large Codebase
When you inherit a project, or return to your own code you have not touched in a while, Outline is a good entry point for grasping the whole. Combine it with @workspace: get the map in hand first, then descend into the details.
@workspace Explain the overall structure of this project for a developer
who has just joined. Center it on the entry point, the role of the main
directories, and the path data flows through. Show only the broad outline first.
The overview you get here can be repurposed directly as a draft for a README or onboarding material. It shortens both the time spent reading code and the time spent explaining it to others.
A Caution When Keeping the Output as Documentation
The summary Outline returns is a snapshot of the code at that moment. As implementation moves on, it drifts from reality. If you keep it as a design doc, noting the generation date and the target commit makes it safe to read later, because you can tell which point in time the map describes. Rather than treating auto-generated prose as the source of truth, add one line of your own intent, and your future self half a year later will thank you.
Looking back: Priority-Order Resolution Flow
Update the plugin and restart the IDE. Re-authenticate through the Command Palette. Verify the Google Cloud project has Gemini API enabled and billing active. Check proxy settings if you're on a corporate network. Clear the IDE cache. Read the extension logs to see the specific error code.
If none of these work, the Gemini Code Assist Community and Google Cloud Support are the right next steps.
A working Outline feature meaningfully accelerates code reviews and documentation sprints. We hope this guide gets you there quickly.