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Detects semantic merge conflicts between Git branches using AST-level analysis
About
Detects semantic merge conflicts between Git branches using AST-level analysis
Security Report
SemaMerge is a well-structured MCP server for detecting semantic merge conflicts in Git repositories. The codebase demonstrates solid engineering practices with proper input validation, sensible error handling, and appropriate permission scoping. No critical security vulnerabilities or malicious patterns were detected. Minor code quality observations exist but do not materially impact security posture. Supply chain analysis found 2 known vulnerabilities in dependencies (1 critical, 1 high severity). Package verification found 1 issue.
5 files analyzed · 7 issues found
Security scores are indicators to help you make informed decisions, not guarantees. Always review permissions before connecting any MCP server.
Permissions Required
This plugin requests these system permissions. Most are normal for its category.
How to Install
Add this to your MCP configuration file:
{
"mcpServers": {
"io-github-vineethwilson15-semamerge": {
"args": [
"-y",
"semamerge"
],
"command": "npx"
}
}
}Documentation
View on GitHubFrom the project's GitHub README.
SemaMerge
An MCP (Model Context Protocol) server that detects semantic merge conflicts between Git branches using AST-level analysis.
When two branches change code in ways that Git merges cleanly but are functionally incompatible, SemaMerge catches it before the merge breaks your app.
What It Detects
| Conflict Type | Example |
|---|---|
| Type signature change | Branch A changes getUser() return type, Branch B calls getUser().address |
| Removed/renamed export | Branch A removes export function validate(), Branch B adds import { validate } |
| Parameter change | Branch A adds required param to function, Branch B calls with old signature |
| Interface/contract break | Branch A adds required field to interface, Branch B implements without it |
| Enum/constant change | Branch A removes Status.PENDING, Branch B uses Status.PENDING |
| Import path change | Branch A moves file, Branch B imports from old path |
Installation
npx semamerge
Or install globally:
npm install -g semamerge
Or clone and build from source:
git clone https://github.com/vineethwilson15/semamerge.git
cd semamerge
npm install
npm run build
MCP Tools
check_merge_safety
Quick pre-merge check. Returns a risk score (safe/warning/danger).
{
"repoPath": "/path/to/repo",
"sourceBranch": "feature-x",
"targetBranch": "main"
}
analyze_branches
Deep analysis with per-file breakdown of all semantic conflicts.
{
"repoPath": "/path/to/repo",
"branchA": "feature-x",
"branchB": "feature-y",
"baseBranch": "main"
}
list_semantic_changes
Lists all semantic changes on a branch (functions, exports, types, etc.).
{
"repoPath": "/path/to/repo",
"branch": "feature-x",
"baseBranch": "main"
}
analyze_file_pair
Deep-dive into a specific file's semantic diff between two branches.
{
"repoPath": "/path/to/repo",
"filePath": "src/utils.ts",
"branchA": "feature-x",
"branchB": "main"
}
Configuration
VS Code (Copilot)
Add to your VS Code settings.json:
{
"mcp": {
"servers": {
"semamerge": {
"command": "node",
"args": ["/path/to/semamerge/dist/index.js"]
}
}
}
}
Claude Desktop
Add to claude_desktop_config.json:
{
"mcpServers": {
"semamerge": {
"command": "node",
"args": ["/path/to/semamerge/dist/index.js"]
}
}
}
Supported Languages
- TypeScript / JavaScript (
.ts,.tsx,.js,.jsx,.mjs,.cjs) - Python support planned
How It Works
- Git layer — Reads file content from branches without checkout using
git show - AST parsing — Parses source code with tree-sitter (WASM) into syntax trees
- Semantic extraction — Walks ASTs to extract function signatures, types, exports, imports, enums
- Three-way comparison — Computes semantic diffs from common ancestor to each branch
- Conflict detection — Cross-references changes to find incompatibilities
Development
npm run build # Compile TypeScript
npm run dev # Watch mode
npm test # Run tests
License
MIT
Reviews
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