Code review session #7

mdlmarkham · 2025-11-18T03:07:57Z

Major refactoring to improve maintainability and code organization.

Changes:

Split 1,712-line mcp_server.py into focused modules (97% reduction to 56 lines)
Created server infrastructure modules (config, dependencies, utils)
Extracted 8 tool modules organized by domain:
- system_tools.py - System monitoring (4 tools)
- file_tools.py - File operations (1 tool)
- admin_tools.py - Package management (1 tool)
- network_tools.py - Network diagnostics (9 tools)
- image_tools.py - Docker image management (3 tools)
- container_tools.py - Container management (5 tools)
- inventory_tools.py - Application inventory (4 tools)
- prompts.py - MCP prompts (9 prompts)
Implemented tool registry pattern for automatic registration
Backed up original as mcp_server_legacy.py

Benefits:
✅ 97% reduction in main file size (1,712 → 56 lines) ✅ Maximum module size: 592 lines (vs 1,712 before) ✅ Clear separation of concerns by domain
✅ Easier testing and maintenance
✅ Better developer experience
✅ No breaking changes - full backwards compatibility

Architecture:

Dependency injection via deps singleton
Centralized service initialization
Shared utilities (caching, formatting, error handling)
Clean registration pattern for adding new tools

Total: 36 tools + 9 prompts across 8 modules
All functionality preserved with zero breaking changes.

Major refactoring to improve maintainability and code organization. Changes: - Split 1,712-line mcp_server.py into focused modules (97% reduction to 56 lines) - Created server infrastructure modules (config, dependencies, utils) - Extracted 8 tool modules organized by domain: * system_tools.py - System monitoring (4 tools) * file_tools.py - File operations (1 tool) * admin_tools.py - Package management (1 tool) * network_tools.py - Network diagnostics (9 tools) * image_tools.py - Docker image management (3 tools) * container_tools.py - Container management (5 tools) * inventory_tools.py - Application inventory (4 tools) * prompts.py - MCP prompts (9 prompts) - Implemented tool registry pattern for automatic registration - Backed up original as mcp_server_legacy.py Benefits: ✅ 97% reduction in main file size (1,712 → 56 lines) ✅ Maximum module size: 592 lines (vs 1,712 before) ✅ Clear separation of concerns by domain ✅ Easier testing and maintenance ✅ Better developer experience ✅ No breaking changes - full backwards compatibility Architecture: - Dependency injection via deps singleton - Centralized service initialization - Shared utilities (caching, formatting, error handling) - Clean registration pattern for adding new tools Total: 36 tools + 9 prompts across 8 modules All functionality preserved with zero breaking changes.

mdlmarkham · 2025-11-18T03:08:20Z

@codex Please review

chatgpt-codex-connector · 2025-11-18T03:19:05Z

Codex Review: Didn't find any major issues. Keep it up!

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mdlmarkham · 2025-11-18T03:22:01Z

@claude Please review

Copilot

Pull Request Overview

This PR successfully refactors a monolithic 1,712-line MCP server into a clean modular architecture, achieving a 97% reduction in the main file size while maintaining complete backwards compatibility.

Key achievements:

Extracted 8 focused tool modules organized by domain (system, file, admin, network, image, container, inventory, prompts)
Created server infrastructure layer for configuration, dependencies, and utilities
Implemented tool registry pattern for automatic registration
Preserved all 36 tools and 9 prompts with no breaking changes

Reviewed Changes

Copilot reviewed 16 out of 16 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
src/mcp_server.py	Refactored main entry point from 1,712 to 56 lines; now imports and registers tools
src/mcp_server_legacy.py	Backup of original monolithic implementation
src/server/config.py	Centralized auth configuration and FastMCP instance creation
src/server/dependencies.py	Dependency injection container with lazy initialization
src/server/utils.py	Shared utilities for caching, error formatting, and response formatting
src/server/init.py	Server module marker
src/tools/init.py	Tool registry with `register_all_tools()` function
src/tools/system_tools.py	4 system monitoring tools (status, processes, network I/O, health)
src/tools/file_tools.py	File operations tool with security validation
src/tools/admin_tools.py	Package management tool
src/tools/network_tools.py	9 network diagnostic tools plus utility functions
src/tools/image_tools.py	3 Docker image management tools
src/tools/container_tools.py	5 Docker container management tools
src/tools/inventory_tools.py	4 application inventory and system identity tools
src/tools/prompts.py	9 pre-configured workflow prompts for common tasks
REFACTORING_SUMMARY.md	Comprehensive documentation of refactoring changes and architecture

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Copilot · 2025-11-18T03:24:51Z

src/server/dependencies.py

+    """Container for shared service dependencies."""
+


Missing documentation for the Dependencies class. While individual methods have docstrings, the class itself should document its purpose as a dependency injection container and explain the lazy initialization pattern being used.

Suggested change

"""Container for shared service dependencies."""

"""

Dependency injection container for shared service dependencies.

This class acts as a central registry for services and resources used throughout the application.

It provides singleton access to shared dependencies such as Docker clients, log analyzers,

package managers, application scanners, and inventory management.

Dependencies are lazily initialized: each service is instantiated only when first accessed,

ensuring efficient resource usage and avoiding unnecessary initialization at startup.

This pattern also facilitates testing and modularity by allowing dependencies to be mocked or replaced.

"""

Copilot · 2025-11-18T03:24:51Z

src/server/utils.py

+# Cache storage
+_cache = {}


The _cache dictionary is a module-level global that grows unbounded. In a long-running server, this could lead to memory leaks as cached entries are never evicted even after TTL expires. Consider implementing a cleanup mechanism (e.g., periodic purging of expired entries) or using a proper caching library with LRU eviction.

Copilot · 2025-11-18T03:24:51Z

src/server/dependencies.py

@@ -0,0 +1,105 @@
+"""Shared dependencies for MCP tools."""
+from typing import Optional


Import of 'Optional' is not used.

Suggested change

from typing import Optional

Copilot · 2025-11-18T03:24:52Z

src/mcp_server_legacy.py

+import time
+import os
+from datetime import datetime
+from typing import Optional, Literal, Union, Any, Dict


Import of 'Any' is not used.
Import of 'Dict' is not used.

Suggested change

from typing import Optional, Literal, Union, Any, Dict

from typing import Optional, Literal, Union

Copilot · 2025-11-18T03:24:52Z

src/mcp_server_legacy.py

+        format: Response format - 'toon' (compact, default) or 'json' (verbose)
+    """
+    import subprocess
+    import re


This import of module re is redundant, as it was previously imported on line 103.

Suggested change

import re

Copilot · 2025-11-18T03:24:52Z

src/mcp_server_legacy.py

+async def traceroute(host: str, max_hops: int = 15) -> dict:
+    """Perform traceroute (returns hop summary, not full details)."""
+    import subprocess
+    import re


This import of module re is redundant, as it was previously imported on line 103.

Suggested change

import re

mdlmarkham · 2025-11-18T03:25:34Z

@copilot open a new pull request to apply changes based on the comments in this thread

Copilot · 2025-11-18T03:25:42Z

@mdlmarkham I've opened a new pull request, #8, to work on those changes. Once the pull request is ready, I'll request review from you.

mdlmarkham marked this pull request as ready for review November 18, 2025 03:22

Copilot AI review requested due to automatic review settings November 18, 2025 03:22

Copilot started reviewing on behalf of mdlmarkham November 18, 2025 03:23 View session

Copilot finished reviewing on behalf of mdlmarkham November 18, 2025 03:23

Copilot AI reviewed Nov 18, 2025

View reviewed changes

Copilot AI mentioned this pull request Nov 18, 2025

[WIP] Refactor mcp_server.py for improved maintainability #8

Merged

mdlmarkham merged commit 6602a36 into master Nov 18, 2025
6 of 7 checks passed

mdlmarkham deleted the claude/code-review-01PxrE5iWptqVHRgtUXveTMa branch November 18, 2025 03:26

-    """Container for shared service dependencies."""
+    """
+    Dependency injection container for shared service dependencies.
+    This class acts as a central registry for services and resources used throughout the application.
+    It provides singleton access to shared dependencies such as Docker clients, log analyzers,
+    package managers, application scanners, and inventory management.
+    Dependencies are lazily initialized: each service is instantiated only when first accessed,
+    ensuring efficient resource usage and avoiding unnecessary initialization at startup.
+    This pattern also facilitates testing and modularity by allowing dependencies to be mocked or replaced.
+    """

		@@ -0,0 +1,105 @@
		"""Shared dependencies for MCP tools."""
		from typing import Optional

	from typing import Optional, Literal, Union, Any, Dict
	from typing import Optional, Literal, Union

Code review session #7

Code review session #7

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