Aider RepoMapper MCP Server

A standalone Model Context Protocol (MCP) server wrapping Aider's graph-ranking repository mapping engine. This server is explicitly hardened for high-efficiency LLM development workflows by optimizing text payloads for strict byte-for-byte Prompt Caching (e.g., Anthropic Prompt Caching via OpenRouter).

Key Features

• Cache-Locked Architecture Summarization: Intercepts volatile file parsing outputs and swaps mutating line numbers for static pipe (|) tokens.

• Rank Score Stripping: Removes fluctuating PageRank floating-point scores ((Rank value: X.XXXX)) generated dynamically in memory, preventing prefix cache invalidation loops across code changes.

• Path Blacklisting Heuristics: Automatically intercepts and filters untracked runtime assets, database dumps, localized state subtrees (data/), and compiled frontend asset bundles (*.min.js) from corrupting the tool context window.

• JSON-RPC Schema Compliant: Plugs natively into agent frameworks like ZooCode, RooCode, and Cursor-agent extension environments out of the box.

Related MCP server: Sigil MCP Server

Server Layout & Core Modules

The repository structures the port across these primary utilities:

• repomap_server.py: Async JSON-RPC server harness exposing tool schemas and managing filesystem parameter inputs.

• repomap_class.py & repomap.py: Local interface adapters wrapping the core Abstract Syntax Tree (AST) tree-sitter parser hooks.

• importance.py & scm.py: Heuristic logic for assessing file contribution ranks and structural tracking states.

• utils.py: Local counting frameworks and atomic file reader fallbacks.

• test_matrix.py: Regression framework validating formatting state guarantees.

Installation & Environment Configuration

Ensure the engine is running within a Python 3.10+ environment containing the core dependency stack (mcp, tiktoken, aider-chat).

Agent Settings Integration

Add the server entry point configuration to your global or project-level MCP definition matrix (e.g., .vscode/mcp.json or .roo/mcp.json):

{
  "mcpServers": {
    "repo-mapper": {
      "command": "/home/barry/tools/RepoMapper/.venv/bin/python",
      "args": ["/home/barry/tools/RepoMapper/repomap_server.py"],
      "env": {
        "PYTHONUNBUFFERED": "1"
      }
    }
  }
}

Exposed MCP Tools

repo_map

Generates an optimized, topologically sorted layout matching the internal repository architecture.

Parameters:

• project_root (string, required): The absolute path to the targeted repository root.

• token_limit (integer, optional): Maximum scale window for the map text block (defaults to 2000).

• exclude_unranked (boolean, optional): Drops low-signal definitions when processing constrained tokens.

• verbose (boolean, optional): Promotes deeper diagnostic stdout updates to log levels.

search_identifiers

Performs keyword-based target cross-referencing against structural symbol matrices.