Gemini-powered MCP server for code review analysis.
Gemini-powered MCP server for code review analysis.
Code Lens is a Model Context Protocol server that uses Google Gemini to analyze diffs, review pull requests, detect code smells, generate documentation, and verify logic. It exposes 13 tools, 7 resources, and 5 prompts over stdio transport.
GEMINI_API_KEY or GOOGLE_API_KEY)Compare MCP servers by category, or browse hosted MCP servers if you prefer an endpoint over a local process.
Check the linked publisher documentation and your connected client's tool list. Names and availability can vary with the server version and account permissions.
| Tool | What it does |
|---|---|
| generate_diff | Capture git diff (unstaged/staged) and cache server-side |
| analyze_pr_impact | Assess severity, categories, breaking changes, rollback complexity |
| generate_review_summary | PR summary, risk rating, merge recommendation |
| generate_test_plan | Prioritized test cases and coverage guidance |
| analyze_time_space_complexity | Big-O complexity analysis and degradation detection |
| detect_api_breaking_changes | Detect breaking API/interface changes |
| load_file | Cache a source file for analysis tools |
| refactor_code | Complexity, duplication, naming, grouping suggestions |
| detect_code_smells | Structural code smells (Fowler taxonomy) |
| generate_documentation | JSDoc/TSDoc/docstring stubs for public exports |
| ask_about_code | Natural-language Q&A about a cached file |
| verify_logic | Verify algorithms via Gemini code execution sandbox |
| web_search | Google Search with Grounding |
{
"mcpServers": {
"code-lens": {
"command": "npx",
"args": ["-y", "@j0hanz/code-lens-mcp@latest"],
"env": {
"GEMINI_API_KEY": "your-api-key"
}
}
}
}Configuration as documented by the project. Restart the client after saving.
GEMINI_API_KEY or GOOGLE_API_KEY)| Variable | Description | Required |
|---|---|---|
| GEMINI_API_KEY | Credential the server authenticates with. | Yes |
| GOOGLE_API_KEY | Credential the server authenticates with. | Yes |
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