TeamCity MCP Server

A Model Control Protocol (MCP) server that bridges AI coding assistants with JetBrains TeamCity CI/CD server, enabling natural language control of builds, tests, and deployments.

Overview

The TeamCity MCP Server allows developers using AI-powered coding assistants (Claude Code, Cursor, Windsurf) to interact with TeamCity directly from their development environment using natural language commands.

Features

🚀 Two Operational Modes

Dev Mode: Safe CI/CD operations
- Trigger builds
- Monitor build status and progress
- Fetch and analyze build logs
- Investigate test failures
- List projects and configurations
Full Mode: Complete infrastructure management
- All Dev mode features, plus:
- Create and clone build configurations
- Manage build steps and triggers
- Configure VCS roots and agents
- Set up new projects
- Modify infrastructure settings

🎯 Key Capabilities

Natural Language Control: Execute CI/CD tasks using conversational commands
Intelligent Analysis: Automatic test failure summarization and build problem identification
Real-time Monitoring: Live build status updates via WebSocket/SSE
Enterprise Security: Token-based authentication with audit logging
Modern Architecture: Simple, direct implementation with singleton pattern
Performance Optimized: Fast startup time with minimal overhead
Clean Codebase: Well-organized modules with clear separation of concerns

Installation

Prerequisites

Node.js >= 24.0.0
TeamCity Server 2020.1+ with REST API access
TeamCity authentication token

Quick Start

# Clone the repository
git clone https://github.com/yourusername/teamcity-mcp.git
cd teamcity-mcp

# Install dependencies
npm install

# Configure environment
cp .env.example .env
# Edit .env with your TeamCity URL and token

# Run in development mode
npm run dev

npm Package (Coming Soon)

npx @teamcity/mcp-server --mode=dev

Configuration

Environment is validated centrally with Zod. Supported variables and defaults:

# Server Configuration
PORT=3000
NODE_ENV=development
LOG_LEVEL=info

# TeamCity Configuration (aliases supported)
TEAMCITY_URL=https://teamcity.example.com
TEAMCITY_TOKEN=your-auth-token
# Optional aliases:
# TEAMCITY_SERVER_URL=...
# TEAMCITY_API_TOKEN=...

# MCP Mode (dev or full)
MCP_MODE=dev

# Optional advanced TeamCity options (defaults shown)
# Connection
# TEAMCITY_TIMEOUT=30000
# TEAMCITY_MAX_CONCURRENT=10
# TEAMCITY_KEEP_ALIVE=true
# TEAMCITY_COMPRESSION=true

# Retry
# TEAMCITY_RETRY_ENABLED=true
# TEAMCITY_MAX_RETRIES=3
# TEAMCITY_RETRY_DELAY=1000
# TEAMCITY_MAX_RETRY_DELAY=30000

# Pagination
# TEAMCITY_PAGE_SIZE=100
# TEAMCITY_MAX_PAGE_SIZE=1000
# TEAMCITY_AUTO_FETCH_ALL=false

# Circuit Breaker
# TEAMCITY_CIRCUIT_BREAKER=true
# TEAMCITY_CB_FAILURE_THRESHOLD=5
# TEAMCITY_CB_RESET_TIMEOUT=60000
# TEAMCITY_CB_SUCCESS_THRESHOLD=2

These values are normalized in src/config/index.ts and consumed by src/teamcity/config.ts via helper getters.

Usage Examples

Once integrated with your AI coding assistant:

"Build the frontend on feature branch"
"Why did last night's tests fail?"
"Deploy staging with the latest build"
"Create a new build config for the mobile app"

Tool Responses and Pagination

Responses: Tools now return consistent MCP content. For list/get operations, the content[0].text contains a JSON string. Example shape: { "items": [...], "pagination": { "page": 1, "pageSize": 100 } } or { "items": [...], "pagination": { "mode": "all", "pageSize": 100, "fetched": 250 } }.
Pagination: Most list_* tools accept pageSize, maxPages, and all:
- pageSize controls items per page.
- all: true fetches multiple pages up to maxPages.
- Legacy count on list_builds is kept for compatibility but pageSize is preferred.

Validation and Errors

Input validation: Tool inputs are validated with Zod schemas; invalid input returns a structured error payload in the response content (JSON string) with success: false and error.code = VALIDATION_ERROR.
Error shaping: Errors are formatted consistently via a global handler. In production, messages may be sanitized; sensitive values (e.g., tokens) are redacted in logs.

API Usage

import { TeamCityAPI } from '@/api-client';

// Get the API client instance
const api = TeamCityAPI.getInstance();

// List projects
const projects = await api.listProjects();

// Get build status
const build = await api.getBuild('BuildId123');

// Trigger a new build
const newBuild = await api.triggerBuild('BuildConfigId', {
  branchName: 'main',
});

Development

# Run tests
npm test

# Run tests with coverage
npm run test:coverage

# Lint code
npm run lint

# Format code
npm run format

# Type check
npm run typecheck

# Build for production
npm run build

Project Structure

teamcity-mcp/
├── src/               # Source code
│   ├── tools/        # MCP tool implementations
│   ├── utils/        # Utility functions
│   ├── types/        # TypeScript type definitions
│   └── config/       # Configuration management
├── tests/            # Test files
├── docs/             # Documentation
└── .agent-os/        # Agent OS specifications

API Documentation

The MCP server exposes tools for TeamCity operations. Each tool corresponds to specific TeamCity REST API endpoints:

Build Management

TriggerBuild - Queue a new build
GetBuildStatus - Check build progress
FetchBuildLog - Retrieve build logs
ListBuilds - Search builds by criteria

Test Analysis

ListTestFailures - Get failing tests
GetTestDetails - Detailed test information
AnalyzeBuildProblems - Identify failure reasons

Configuration (Full Mode Only)

create_build_config - Create new TeamCity build configurations with full support for:
- VCS roots (Git, SVN, Perforce) with authentication
- Build steps (script, Maven, Gradle, npm, Docker, PowerShell)
- Triggers (VCS, schedule, finish-build, maven-snapshot)
- Parameters and template-based configurations
- See the Tool Reference for details: docs/mcp-tools-reference.md
CloneBuildConfig - Duplicate configurations (coming soon)
ManageBuildSteps - Add/edit/remove steps (coming soon)
ManageVCS - Configure version control (coming soon)

See also: docs/TEAMCITY_MCP_TOOLS_GUIDE.md for an overview. Some advanced sections in that guide describe future enhancements; the behavior above reflects the current implementation.

Contributing

We welcome contributions! Please see CONTRIBUTING.md for details.

Security

Configure TEAMCITY_TOKEN via environment (see .env.example); never commit real tokens
Token-based authentication only
Logs redact sensitive values

Support

GitHub Issues: Report bugs or request features
Documentation: See the docs/ folder in this repository

Acknowledgments

JetBrains TeamCity for the excellent CI/CD platform
Anthropic for the Model Control Protocol specification
The open-source community for continuous support

Built with ❤️ for developers who love efficient CI/CD workflows

TeamCity MCP Server