Github MCP Server Java

GitHub MCP Server — Java / Spring AI

A production-ready MCP server that connects any MCP-compatible AI agent to the GitHub API. Manage repositories, issues, pull requests, and search — all through natural language.

Transport: HTTP/SSE on port 8080, compatible with Cursor and Claude Desktop out of the box.

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Why this server?

Capability	This server	GitHub REST API
Repository management	✅	✅
Issue & PR operations	✅	✅
Branch & commit control	✅	✅
Code & user search	✅	✅
Natural language interface	✅	❌
MCP protocol (SSE)	✅	❌
Java / Spring AI	✅	❌
GitHub Enterprise support	✅	✅

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Tools (38 total)

Category	Count	Tools
Repository	11	create_repository, fork_repository, get_repository, list_commits, get_commit, get_file_contents, create_or_update_file, delete_file, create_branch, list_branches, merge_branch
Issues	11	create_issue, update_issue, add_issue_comment, list_issues, get_issue, close_issue, reopen_issue, assign_issue, unassign_issue, add_issue_labels, remove_issue_label
Pull Requests	10	create_pull_request, update_pull_request, list_pull_requests, get_pull_request, merge_pull_request, close_pull_request, reopen_pull_request, add_pull_request_comment, create_pull_request_review, submit_pull_request_review
Search	4	search_code, search_issues, search_repositories, search_users
Users	3	get_authenticated_user, get_user, list_user_repositories

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Quick start

# 1. Build
mvn clean package

# 2. Set credentials
export GITHUB_PERSONAL_ACCESS_TOKEN=ghp_...

# 3. Run (SSE transport — port 8080)
java -jar target/github-mcp-server-1.0.0.jar

# 4. Verify
curl http://localhost:8080/health

# 5. Inspect all tools
npx @modelcontextprotocol/inspector http://localhost:8080/sse

Get your token from GitHub Settings → Developer settings → Personal access tokens. For GitHub Enterprise, set GITHUB_HOST to your instance URL.

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Architecture

MCP Client (Cursor / Claude Desktop / other)
    │   HTTP/SSE transport (/sse + /mcp/message)
    ▼
Tool class  (@McpTool — thin delegation layer, validates required params)
    ▼
Service interface + impl  (business logic, error mapping, pagination)
    ▼
GitHubRestClient  (typed HTTP gateway, PAT auth, exception handling)
    ▼
GitHub REST API

The architecture is strictly layered:

• client/ — GitHub integration boundary (HTTP, Bearer-Auth, error handling)
• service/ — domain logic (filtering, mapping, pagination)
• tools/ — MCP-facing surface (descriptions, param validation, delegation)
• Spring Boot — runtime and transport wrapper only

Every tool returns a consistent ApiResponse<T> envelope:

{ "success": true,  "data": { ... } }
{ "success": false, "errorCode": "REPO_NOT_FOUND", "errorMessage": "..." }

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Configuration

Property	Env var	Required	Default	Description
—	GITHUB_PERSONAL_ACCESS_TOKEN	✅	—	GitHub Personal Access Token
—	GITHUB_HOST	❌	github.com	GitHub hostname (for GitHub Enterprise)
—	GITHUB_READ_ONLY	❌	false	Restrict to read-only operations
—	GITHUB_TOOLSETS	❌	all	Comma-separated list of toolsets to enable
—	GITHUB_TOOLS	❌	all	Comma-separated list of specific tools to enable
—	GITHUB_EXCLUDE_TOOLS	❌	none	Comma-separated list of tools to exclude

Creating a GitHub Personal Access Token

1. Go to GitHub Settings → Developer settings → Personal access tokens
2. Click "Generate new token (classic)"
3. Select the following scopes:
   • repo — Full control of private repositories
   • workflow — Update GitHub Action workflows
   • read:org — Read org and team membership
   • gist — Create gists
   • notifications — Access notifications
   • read:user — Read user profile data
4. Generate and copy the token

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Client config

Cursor (.cursor/mcp.json)

{
  "mcpServers": {
    "github": {
      "url": "http://localhost:8080/sse"
    }
  }
}

Claude Desktop (claude_desktop_config.json)

{
  "mcpServers": {
    "github": {
      "url": "http://localhost:8080/sse"
    }
  }
}

On macOS: ~/Library/Application Support/Claude/claude_desktop_config.json

VS Code / GitHub Copilot

URL mode (if your client supports it):

{
  "github.copilot.chat.mcp.servers": {
    "github": {
      "url": "http://localhost:8080/sse"
    }
  }
}

Command mode (stdio-only clients):

{
  "github.copilot.chat.mcp.servers": {
    "github": {
      "command": "java",
      "args": ["-jar", "/path/to/github-mcp-server-1.0.0.jar"],
      "env": {
        "GITHUB_PERSONAL_ACCESS_TOKEN": "ghp_..."
      }
    }
  }
}

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Docker

# Build image
docker build -t github-mcp-server:latest .

# Run
docker run --rm -p 8080:8080 \
  -e GITHUB_PERSONAL_ACCESS_TOKEN=ghp_... \
  github-mcp-server:latest

If GitHub Enterprise runs in Docker on the same host, use host.docker.internal:

-e GITHUB_HOST=http://host.docker.internal:3000

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Running tests

mvn test

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Package structure

com.github.mcp
├── GithubMcpApplication.java              @SpringBootApplication
├── config/
│   ├── GitHubProperties.java              @ConfigurationProperties — token, host, readOnly, toolsets
│   └── WebConfig.java                     Web configuration
├── client/
│   ├── GitHubRestClient.java              GET/POST/PATCH/DELETE HTTP gateway; typed exceptions
│   └── GitHubGraphqlClient.java           GraphQL client
├── controller/
│   └── HealthController.java              Health check endpoint (GET /health)
├── exception/
│   ├── GitHubMcpException.java            Base exception
│   └── GlobalExceptionHandler.java        Global error handler
├── dto/
│   ├── common/   ApiResponse · PagedResponse
│   ├── request/  *Request DTOs
│   └── response/ *Response DTOs
├── service/      Interfaces + impl — business logic, error mapping, pagination
└── tools/
    ├── RepositoryTools.java   (11 tools)
    ├── IssueTools.java        (11 tools)
    ├── PullRequestTools.java  (10 tools)
    ├── SearchTools.java       (4 tools)
    └── UserTools.java         (3 tools)

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Troubleshooting

401 Unauthorized

Token issue. Check:

1. GITHUB_PERSONAL_ACCESS_TOKEN is set correctly
2. The token has not expired
3. The token has the required scopes (see Configuration)
4. For GitHub Enterprise: confirm GITHUB_HOST is set to your instance URL

REPO_NOT_FOUND / 404 Not Found

The repository may be private and the token lacks repo scope, or the owner/name is incorrect.

Connection timeouts

The server connects to api.github.com (or your GITHUB_HOST). Ensure the JVM process has outbound network access.

Copilot / Claude can't see the server

1. Confirm the server is running: curl http://localhost:8080/health
2. Confirm the MCP SSE endpoint is alive: curl http://localhost:8080/sse
3. Check that the URL in the client config points to http://localhost:8080/sse

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Acknowledgments

This project is a Java / Spring AI port of the official GitHub MCP Server written in Go.

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License

MIT License — see LICENSE for details.