Semamerge
@vineethwilson15
About Semamerge
MCP server that detects semantic (non-textual) merge conflicts between Git branches using AST-level analysis. Catches incompatible changes that Git merges cleanly but break at runtime — like signature changes, removed exports, interface breaks, and cross-file dependency conflicts
Config
Add this server to your MCP-compatible client using the configuration below.
{
"mcpServers": {
"semamerge": {
"command": "npx",
"args": [
"-y",
"semamerge"
]
}
}
}Tools
4Quick pre-merge safety check. Analyzes two branches for semantic conflicts that Git would miss (signature changes, removed exports, parameter mismatches, etc.). Returns a risk score: safe/warning/danger.
Deep semantic analysis between two branches. Returns a detailed per-file report of all semantic changes and conflicts, including cross-file dependency issues.
Lists all semantic changes on a branch (function additions/removals, export changes, type changes, etc.) relative to a base. Useful for understanding what semantically changed.
Deep-dive semantic diff of a single file between two branches. Shows exactly what each branch changed and where conflicts arise.
Overview
What is Semamerge?
Semamerge is a tool that detects semantic merge conflicts across branches, including type signature changes, removed exports, parameter changes, interface breaks, enum/constant changes, and cross-file dependency breaks. It is aimed at developers who want to identify breaking changes before merging branches.
How to use Semamerge?
Install with npm install -g semamerge. Use the provided CLI tools: check_merge_safety for a quick risk score, analyze_branches for deep per-file analysis, list_semantic_changes to list all semantic changes on a branch, and analyze_file_pair for a single-file deep dive between two branches.
Key features of Semamerge
- Detects type signature changes between branches
- Identifies removed or renamed exports
- Catches parameter changes in function calls
- Flags interface/contract breaks
- Alerts on enum/constant member changes
- Detects cross-file import/export dependency breaks
Use cases of Semamerge
- Pre-merge safety check before integrating feature branches
- Reviewing all semantic changes on a branch before review
- Deep-diving into a specific file’s conflict between two branches
- Analyzing cross-file dependency breaks that standard diff tools miss
FAQ from Semamerge
What conflicts does Semamerge detect
Basic information
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