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Created February 23, 2026 05:48
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FalkorDB-MCPServer-Full-Project-Code-Review.md

FalkorDB-MCPServer — Full Project Code Review

You are an expert TypeScript/Node.js engineer with deep knowledge of the Model Context Protocol (MCP), graph databases, and production server design. Your task is to conduct a thorough code review of the FalkorDB-MCPServer project at its current state on main: https://github.com/FalkorDB/FalkorDB-MCPServer

Clone the repository and read every file before reviewing. The project was recently significantly refactored — it now uses the MCP TypeScript SDK directly (stdio transport) instead of a custom Hono HTTP server, and brings in a richer layered architecture. Review it accordingly.

1. Architecture & Design

  • Does the overall src/ structure make sense? Evaluate the separation between services/, mcp/, errors/, config/, models/, and utils/.
  • The server switched from a custom HTTP/Hono approach to the MCP SDK with stdio transport. Was this the right architectural call? Are there any transport or lifecycle concerns?
  • Is index.ts a clean entry point, or is it doing too much? Is startup logic (config validation, DB connection, MCP registration) handled in the right order?
  • Is the connection-parser.ts utility robust enough to handle edge cases in connection strings?

2. FalkorDB Integration (services/falkordb.service.ts)

  • How is the FalkorDB client instantiated and managed? Is connection pooling or reconnection logic handled correctly?
  • Are OpenCypher queries constructed safely? Look carefully for any Cypher injection risks from user-supplied inputs passed through MCP tool calls.
  • Is FALKORDB_DEFAULT_READONLY mode correctly enforced throughout — including when readOnly is overridden per-query in tool calls? Could it be bypassed?
  • How are FalkorDB-specific errors and timeouts surfaced back to the MCP client?

3. Redis Integration (services/redis.service.ts)

  • Is the Redis service clearly separated from FalkorDB concerns?
  • Is the Redis connection managed safely (error handling, reconnects, graceful shutdown)?
  • Are there any unnecessary Redis operations, or is it used only where appropriate?

4. MCP Protocol Correctness (mcp/tools.ts, mcp/resources.ts, mcp/prompts.ts)

  • Are all MCP tools correctly defined with proper Zod input schemas? Are schemas too permissive or too strict?
  • Are resources and prompts implemented correctly per the MCP spec, and do they add genuine value?
  • There is a known WIP (PR #18) to fix a Zod/TypeScript error in the schemas — identify the root cause in the current code and propose the correct fix.
  • Are tool responses formatted correctly (text content blocks, error content, etc.)?
  • Is there proper handling for malformed, missing, or unexpected MCP tool inputs?

5. Error Handling (errors/AppError.ts, errors/ErrorHandler.ts)

  • Is the custom error class hierarchy appropriate? Are errors correctly typed and consistently thrown?
  • Does the global error handler translate errors into valid MCP error responses?
  • Are there any unhandled promise rejections or missing try/catch blocks in async tool handlers?
  • Are there any cases where raw error messages (potentially containing secrets or stack traces) could leak to MCP clients?

6. Configuration (config/index.ts)

  • Are all required environment variables validated at startup? Can the server start in a broken state if variables are missing?
  • Are defaults sensible and documented?
  • Is the .env.example file complete and accurate relative to what config/index.ts actually reads?

7. Logging (services/logger.service.ts)

  • Is the logger well-structured and consistent across the codebase?
  • Does it use MCP notifications for logging (as appropriate for stdio transport), or does it incorrectly write to stdout (which would corrupt the MCP stdio stream)?
  • Are log levels appropriate? Is there any risk of sensitive data (passwords, API keys, query contents) being logged?

8. Security

  • Is there any authentication/authorization layer? For a stdio MCP server this may not be needed — but confirm this is intentional and document the threat model.
  • Are environment variables containing secrets (passwords, API keys) handled safely — never logged, never exposed in error messages?
  • Evaluate the Dockerfile — does it follow security best practices (non-root user, minimal base image, no secrets baked in)?

9. TypeScript Quality

  • Is TypeScript used strictly (tsconfig.json)? Look for any, unsafe casts, missing return types, or suppressed errors.
  • Are models/mcp.types.ts and models/mcp-client-config.ts well-typed and consistent with the MCP SDK's own types?
  • Does npm run build complete cleanly with zero warnings or errors?

10. Testing

  • Evaluate jest.config.js and any test files. What is the current coverage?
  • Are the MCP tool handlers tested in isolation with mocked FalkorDB/Redis services?
  • What are the most critical gaps — empty graphs, invalid queries, connection failures, read-only bypass attempts?

11. Developer Experience & Documentation

  • Is the README.md accurate for the current codebase? The old README described a Hono HTTP API — has it been updated to reflect the stdio MCP transport?
  • Are npm scripts (dev, build, start, test) working and clearly documented?
  • Are there any remaining artifacts from the old Hono-based architecture that should be cleaned up?

12. Open PRs to be Aware Of

Review these open PRs and flag if any of their concerns already exist on main or are now moot:

  • PR #18 — WIP Zod schema TypeScript fix
  • PR #19 — Bump hono to 4.12.0 (is Hono even still used?)
  • PR #20 — Add badges and links to README
  • PR #22 — Docker Compose setup

Output Format

For each area above, provide:

  • Summary: 2–3 sentences on the current state.
  • Issues Found: Specific bugs, risks, or anti-patterns with file names and line numbers where possible.
  • Recommendations: Concrete, actionable fixes with code snippets where helpful.

At the end, provide:

  • A Priority List of the top 5 issues to fix immediately, ranked by severity.
  • A Nice-to-Have list of lower-priority improvements.
  • An overall health score from 1–10 with a one-paragraph justification.

Be direct and specific. Don't praise code to be polite — the goal is to make this server production-ready and a high-quality reference implementation for the FalkorDB ecosystem.

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