feat(chore):integration between lb4 applications and mcp #2

vaibhavbhalla2505 · 2025-11-19T08:07:12Z

Description

This pull request introduces significant improvements to project infrastructure, developer workflow, and documentation. The main focus is on enhancing project governance (with new contribution and conduct guidelines), automating CI/CD processes, strengthening commit and linting standards, and improving documentation and template files for contributors.

Project governance and contribution guidelines:

Added a comprehensive CODE_OF_CONDUCT.md to define expected behavior and enforcement procedures for community members.
Added a detailed CONTRIBUTING.md to guide new contributors through the process of reporting issues, branching, and submitting pull requests.
Introduced issue and pull request templates to standardize bug reports, feature requests, and PR submissions. [1] [2] [3]

CI/CD automation and workflows:

Added GitHub Actions workflows for CI testing across multiple Node.js versions, manual release processes with semantic versioning, syncing documentation to a separate repo, and running Trivy security scans. [1] [2] [3] [4]

Commit and linting standards:

Introduced a commitizen configuration (.cz-config.js) to enforce conventional commit messages, including types, scopes, and message formatting.
Added Husky hooks for pre-commit testing, commit message linting, and interactive commit message prompts. [1] [2] [3]
Updated .eslintignore to exclude configuration files, and enhanced .eslintrc.js with custom rules and TypeScript project settings. [1] [2]

Documentation and developer experience:

Improved README.md with more detailed usage instructions and clarified code examples. [1] [2] [3]
Updated .vscode/settings.json to include build artifacts in the workspace.

These changes collectively improve the project's maintainability, onboarding experience, and code quality.

Fixes #1

yeshamavani · 2025-11-24T07:00:37Z

Since this is a new repo
need to add all the git templates
commitizen
semantic release setup
@vaibhavbhalla2505

vaibhavbhalla2505 · 2025-11-24T08:10:43Z

Since this is a new repo need to add all the git templates commitizen semantic release setup @vaibhavbhalla2505

@yeshamavani done!

rohit-sourcefuse

Comprehensive Senior Architecture/Dev Review

Overview

This is an extensive PR (+21,550, -3,630 lines across 41 files) introducing MCP (Model Context Protocol) integration for LoopBack 4 applications. While the implementation demonstrates solid architectural patterns and comprehensive tooling setup, there are several critical issues that need attention before merging.

🔴 CRITICAL ISSUES

1. Security Vulnerability - Overly Permissive Authorization

Location: src/controllers/mcp-controller.controller.ts:20-22

@authorize({
  permissions: ['*'],  // ❌ CRITICAL: Grants ALL permissions
})

Issue: Using wildcard permissions ('*') is a severe security risk. This grants unrestricted access to all MCP tools regardless of user permissions.

Recommendation:

@authorize({
  permissions: ['mcp.execute', 'mcp.tools.access'],
})

2. Missing SonarQube Configuration

Issue: PR mentions Sonar in commit message but sonar-project.properties is missing.

Action Required: Add SonarQube configuration:

sonar.projectKey=sourcefuse_loopback4-mcp
sonar.sources=src
sonar.tests=src/__tests__
sonar.javascript.lcov.reportPaths=coverage/lcov.info
sonar.coverage.exclusions=**/__tests__/**,**/*.spec.ts

3. Disabled ESLint Rule Without Justification

Location: src/controllers/mcp-controller.controller.ts:83

/* eslint-disable @typescript-eslint/no-misused-promises */

Issue: Disabling this rule hides potential async/await bugs.

Fix: Properly handle async operations:

res.on('close', () => {
  void (async () => {
    await transport.close();
    await server.close();
    this.logger.info('Session closed.');
  })();
});

⚠️ HIGH PRIORITY ISSUES

4. Node Engine Specification Too Broad

Location: package.json:12

"node": ">=20"  // Changed from "20 || 22 || 24"

Issue: This allows untested Node versions (e.g., 21, 23, 25+) which may have breaking changes.

Recommendation: Revert to explicit versions or use:

"node": ">=20 <25"

5. Configuration Mismatch

Location: package.json:81

"config": "./.cz-config.cjs"  // File is actually .cz-config.js

Fix:

"config": "./.cz-config.js"

6. Husky Pre-commit Performance Issue

Location: .husky/pre-commit:4

npm test  # Runs ALL tests on every commit

Issue: This will significantly slow down developer workflow.

Recommendation:

npm run lint:fix
npm run test:staged  # Only test changed files

7. Missing Input Validation

Location: src/controllers/mcp-controller.controller.ts:71

Issue: No schema validation for incoming MCP request payloads.

Recommendation: Add request body validation:

requestBody: {
  content: {
    [CONTENT_TYPE.JSON]: {
      schema: {
        type: 'object',
        required: ['jsonrpc', 'method'],
        properties: {
          jsonrpc: { type: 'string', enum: ['2.0'] },
          method: { type: 'string' },
          params: { type: 'object' },
          id: { type: ['string', 'number', 'null'] },
        },
      },
    },
  },
},

🟡 MEDIUM PRIORITY ISSUES

8. Insufficient Test Coverage

Files: Only 2 test files for extensive functionality

src/__tests__/unit/mcp-controller.unit.ts
src/__tests__/integration/mcp-tool.integration.ts

Missing Tests:

McpToolRegistry service tests
McpSchemaGeneratorService tests
Decorator tests
Observer tests
End-to-end integration tests

Recommendation: Add comprehensive test suite with >80% coverage target.

9. Tight Coupling to @sourceloop/core

Issue: Direct dependency on @sourceloop/core reduces reusability.

Recommendation: Create abstractions for logger and status codes:

export interface IMcpLogger {
  info(message: string, ...args: unknown[]): void;
  error(message: string, ...args: unknown[]): void;
  warn(message: string, ...args: unknown[]): void;
}

10. Missing Error Boundary Middleware

Issue: No global error handling for MCP-specific errors.

Recommendation: Add error handler sequence:

this.sequence(McpErrorHandlerSequence);

📝 CODE QUALITY SUGGESTIONS

11. Magic Numbers in Error Handling

Location: src/controllers/mcp-controller.controller.ts:104

code: -32603,  // Magic number

Recommendation:

const MCP_ERROR_CODES = {
  INTERNAL_ERROR: -32603,
  INVALID_REQUEST: -32600,
  METHOD_NOT_FOUND: -32601,
} as const;

12. Inconsistent Parameter Extraction

Location: src/services/mcp-tool-registry.service.ts:289-301

Issue: Fallback behavior isn't well documented.

Recommendation: Add JSDoc:

/**
 * Prepare method arguments from MCP tool call.
 * - If parameterNames defined: maps args by parameter names
 * - If no parameterNames: passes args object directly (legacy fallback)
 */
private prepareMethodArguments(...)

13. Semantic Release Configuration Incomplete

Location: package.json:87-120

Missing: Changelog plugin configuration

Add:

[
  "@semantic-release/changelog",
  {
    "changelogFile": "CHANGELOG.md"
  }
]

✅ POSITIVE ASPECTS

✅ Excellent Architecture: Clean separation of concerns with services, controllers, decorators
✅ Comprehensive Tooling: Commitizen, Husky, semantic-release properly configured
✅ Good Use of LoopBack Patterns: Proper use of DI, metadata, lifecycle observers
✅ CI/CD Setup: GitHub workflows for CI, release, and doc sync
✅ All CI Checks Pass: Tests, linting, and Trivy security scans passing
✅ Hook System: Pre/post hook architecture is well designed
✅ Type Safety: Strong TypeScript typing throughout

📋 ACTION ITEMS (Before Merge)

Must Fix:

Fix authorization wildcard permissions
Add SonarQube configuration
Fix ESLint disable issue
Fix commitizen config path
Add input validation to MCP controller

Should Fix:

Revert Node engine to specific versions
Optimize pre-commit hook
Add missing test coverage
Extract magic numbers to constants

Nice to Have:

Add README documentation for MCP usage
Create migration guide
Add architecture diagram
Reduce coupling to @sourceloop/core

🎯 FINAL RECOMMENDATION

Status: ⚠️ REQUEST CHANGES

This PR demonstrates excellent architectural design and comprehensive tooling setup. However, the critical security issue with authorization and missing Sonar configuration must be addressed before merging. Once these critical issues are resolved, this will be a solid addition to the codebase.

Estimated Effort to Fix: 4-6 hours

📚 Additional Resources

For secure authorization patterns, refer to:

Great work overall! The MCP integration architecture is solid. Please address the critical issues and we can move forward.

rohit-sourcefuse

README Enhancement Suggestions

The README could be more comprehensive. Consider adding the following sections:

1. Prerequisites & Requirements

Node.js version (>= 20 recommended)
LoopBack 4 version compatibility
MCP SDK version required

2. Mandatory Decorator Parameters

Document the required params for @mcpTool decorator:

Parameter	Type	Required	Description
`name`	string	Yes	Unique tool identifier
`description`	string	Yes	Tool description
`schema`	object	Recommended	Zod schema for input validation

3. Quick Start Example

@mcpTool({
  name: 'create-user',
  description: 'Creates a new user',
  schema: {
    email: z.string().email(),
    name: z.string()
  }
})
async createUser(args: { email: string; name: string }) {
  return { message: `User ${args.name} created` };
}

4. Additional Sections to Add

Hook Bindings: How to register pre/post hooks
Testing: How to run tests (npm run test)
API Reference: Main exported classes/functions
Troubleshooting: Common issues (missing required params, schema errors)
CI/CD: Mention Husky + Commitlint setup

package.json

src/controllers/mcp-controller.controller.ts

added git templates Gh-1

src/controllers/mcp.controller.ts

src/component.ts

README.md

src/__tests__/unit/mcp-controller.unit.ts

akshatdubeysf · 2025-12-11T11:49:48Z

src/__tests__/unit/mcp-controller.unit.ts

+  });
+
+  describe('handleMCPRequest', () => {
+    it('should successfully handle MCP request', async () => {


this should be an acceptance test with actual mcp client to ensure real coverage

Are you sure you are testing the code of your implementation?

src/controllers/mcp.controller.ts

akshatdubeysf · 2025-12-11T11:54:22Z

src/services/mcp-tool-registry.service.ts

+              throw error;
+            } finally {
+              await this.executePostHook(ctx, tool, hookContext);
+              ctx.close();


what if post hook fails?

added try catch block

Are you sure that is the right way to do it

src/services/mcp-tool-registry.service.ts

yeshamavani · 2025-12-11T11:55:27Z

.github/workflows/main.yaml

+        with:
+          node-version: ${{ matrix.node-version }}
+      - name: Install Dependencies
+        run: npm ci


--ignore-scripts

in all files

yeshamavani · 2025-12-11T11:58:03Z

src/types.ts

remove commented code

access-control interceptor support for MCP endpoint GH-1

src/__tests__/acceptance/mcp.acceptance.ts

akshatdubeysf · 2025-12-15T10:22:12Z

src/__tests__/unit/mcp-controller.unit.ts

+  });
+
+  describe('handleMCPRequest', () => {
+    it('should successfully handle MCP request', async () => {


Are you sure you are testing the code of your implementation?

akshatdubeysf · 2025-12-15T10:23:27Z

src/services/mcp-tool-registry.service.ts

+              throw error;
+            } finally {
+              await this.executePostHook(ctx, tool, hookContext);
+              ctx.close();


Are you sure that is the right way to do it

src/__tests__/acceptance/mcp.acceptance.ts

adding test cases and refactor the code GH-1

upgrade modelcontext version GH-1

sonarqubecloud · 2025-12-19T11:05:23Z

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.6% Duplication on New Code

See analysis details on SonarQube Cloud

vaibhavbhalla2505 requested a review from yeshamavani November 19, 2025 08:07

vaibhavbhalla2505 self-assigned this Nov 19, 2025

vaibhavbhalla2505 added the enhancement New feature or request label Nov 19, 2025

vaibhavbhalla2505 changed the title ~~integration between lb4 applications and mcp~~ feat:integration between lb4 applications and mcp Nov 19, 2025

vaibhavbhalla2505 changed the title ~~feat:integration between lb4 applications and mcp~~ feat(chore):integration between lb4 applications and mcp Nov 19, 2025

vaibhavbhalla2505 force-pushed the GH-1 branch 2 times, most recently from 78fb312 to 71bab3c Compare November 24, 2025 07:17

integration between lb4 applications and mcp

fa9f18f

vaibhavbhalla2505 force-pushed the GH-1 branch 2 times, most recently from 998520a to 7020d58 Compare November 24, 2025 08:09

rohit-sourcefuse requested changes Nov 24, 2025

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vaibhavbhalla2505 force-pushed the GH-1 branch 5 times, most recently from be1e8e6 to 84d1e8b Compare November 25, 2025 06:36

rohit-sourcefuse reviewed Nov 25, 2025

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vaibhavbhalla2505 force-pushed the GH-1 branch from 84d1e8b to fde5687 Compare November 25, 2025 07:44

yeshamavani requested changes Nov 25, 2025

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feat(chore): added git templates

9f21f07

added git templates Gh-1

vaibhavbhalla2505 force-pushed the GH-1 branch from fde5687 to 9f21f07 Compare November 25, 2025 11:13

Tyagi-Sunny reviewed Nov 26, 2025

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Tyagi-Sunny approved these changes Nov 26, 2025

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akshatdubeysf requested changes Dec 11, 2025

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yeshamavani requested changes Dec 11, 2025

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vaibhavbhalla2505 force-pushed the GH-1 branch 3 times, most recently from 6487410 to a959a4d Compare December 12, 2025 07:46

feat(chore): access-control interceptor support for MCP endpoint

6173d8c

access-control interceptor support for MCP endpoint GH-1

vaibhavbhalla2505 force-pushed the GH-1 branch from a959a4d to 6173d8c Compare December 15, 2025 08:43

akshatdubeysf requested changes Dec 15, 2025

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vaibhavbhalla2505 force-pushed the GH-1 branch 3 times, most recently from 13be935 to b95c21d Compare December 19, 2025 05:59

refactor(chore): adding test cases and refactor the code

f27d3d5

adding test cases and refactor the code GH-1

vaibhavbhalla2505 force-pushed the GH-1 branch from b95c21d to f27d3d5 Compare December 19, 2025 06:02

akshatdubeysf approved these changes Dec 19, 2025

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vaibhavbhalla2505 force-pushed the GH-1 branch from 6f7d33f to 430457c Compare December 19, 2025 10:37

fix(deps): upgrade modelcontext version

9e88e4e

upgrade modelcontext version GH-1

vaibhavbhalla2505 force-pushed the GH-1 branch from 430457c to 9e88e4e Compare December 19, 2025 11:04

yeshamavani merged commit 0f82909 into master Dec 19, 2025
7 checks passed

feat(chore):integration between lb4 applications and mcp #2

feat(chore):integration between lb4 applications and mcp #2

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vaibhavbhalla2505 commented Nov 19, 2025 • edited Loading Uh oh! There was an error while loading. Please reload this page.

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Description

Fixes #1

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yeshamavani commented Nov 24, 2025

Uh oh!

vaibhavbhalla2505 commented Nov 24, 2025

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rohit-sourcefuse left a comment

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Comprehensive Senior Architecture/Dev Review

Overview

🔴 CRITICAL ISSUES

1. Security Vulnerability - Overly Permissive Authorization

2. Missing SonarQube Configuration

3. Disabled ESLint Rule Without Justification

⚠️ HIGH PRIORITY ISSUES

4. Node Engine Specification Too Broad

5. Configuration Mismatch

6. Husky Pre-commit Performance Issue

7. Missing Input Validation

🟡 MEDIUM PRIORITY ISSUES

8. Insufficient Test Coverage

9. Tight Coupling to @sourceloop/core

10. Missing Error Boundary Middleware

📝 CODE QUALITY SUGGESTIONS

11. Magic Numbers in Error Handling

12. Inconsistent Parameter Extraction

13. Semantic Release Configuration Incomplete

✅ POSITIVE ASPECTS

📋 ACTION ITEMS (Before Merge)

Must Fix:

Should Fix:

Nice to Have:

🎯 FINAL RECOMMENDATION

📚 Additional Resources

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rohit-sourcefuse left a comment

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README Enhancement Suggestions

1. Prerequisites & Requirements

2. Mandatory Decorator Parameters

3. Quick Start Example

4. Additional Sections to Add

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vaibhavbhalla2505 commented Nov 19, 2025 •

edited

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