Code Sentinel MCP server

CodeSentinel MCP Server

A comprehensive code quality analysis server for the Model Context Protocol (MCP). CodeSentinel integrates with Claude Code and other MCP-compatible clients to detect security vulnerabilities, deceptive patterns, incomplete code, and highlight good practices.

Why CodeSentinel?

AI coding assistants can inadvertently introduce subtle issues: hardcoded secrets, empty catch blocks, TODO placeholders left behind, or patterns that hide errors. CodeSentinel acts as a quality gate, analyzing code for 93 distinct patterns across 5 categories before issues reach production.

Key differentiators:

• Verification-aware detection: Many patterns include verification steps to reduce false positives
• LLM-optimized output: Structured JSON output designed for AI consumption and action
• Balanced analysis: Detects both issues AND strengths for fair code assessment
• Multi-language support: Works with TypeScript, JavaScript, Python, Go, Rust, Java, and more

Why Not Tree-sitter or AST-Based Tools?

CodeSentinel intentionally uses a pattern-based approach rather than AST parsing. Here's why:

The Problem We Solve Is Different

Traditional linters (ESLint, tree-sitter) detect syntax errors and style violations. CodeSentinel detects semantically deceptive patterns - code that is:

• Syntactically valid (passes all linters)
• Structurally correct (valid AST)
• But hides serious issues that AI agents commonly produce

Examples AST Tools Miss

// AST sees: valid try-catch block
// CodeSentinel sees: error swallowing that masks failures
try { riskyOperation(); } catch(e) { }

// AST sees: valid function returning boolean
// CodeSentinel sees: fake implementation that always succeeds
function validateUser() { return true; } // TODO: implement

// AST sees: valid fallback expression
// CodeSentinel sees: failure masking - "no data" vs "fetch failed" indistinguishable
const users = response.data || [];

// AST sees: valid return statement
// CodeSentinel sees: silent failure hiding
if (error) { return null; } // error case

What Each Approach Detects

The Real Issue: Agent Behavior

AI coding agents produce code that looks correct but contains subtle deceptions:

1. "Making the error go away" - Empty catches, silent returns, swallowed exceptions
2. Placeholder implementations - return true, return [], TODO comments
3. False confidence patterns - || [] fallbacks that mask fetch failures
4. Suppression abuse - @ts-ignore, eslint-disable to hide type errors

These patterns pass every linter and compile successfully. AST tools see valid structure. Only pattern-based detection catches the semantic intent behind the code.

When to Use What

CodeSentinel complements these tools - it catches what they structurally cannot.

Features

Shortened. The full README is on GitHub.