TeamCity 2026.1: New CLI, AI Agent Integration, Pipelines Upgrades & Security Fixes

Welcome to this Q&A breakdown of TeamCity 2026.1, a major release that brings a command-line interface, AI agent capabilities, enhanced pipelines configuration, and important security updates. Whether you’re a developer, DevOps engineer, or TeamCity administrator, these changes are designed to streamline your workflows and strengthen your CI/CD environment. Below we answer the most pressing questions about this release.

What is the new TeamCity CLI and how can it help me?

The TeamCity CLI is a free, open-source command-line tool that lets you interact with your TeamCity server directly from your terminal. It includes over 60 commands (with more planned) for tasks like inspecting failed builds, applying fixes, configuring pipelines, and retriggering jobs. You can install it via brew, winget, npm, or a simple shell script. The CLI also features a skill for AI coding agents, enabling them to check build status, analyze failures, and interact with pipelines in real time. This means both you and your AI assistant can monitor build progress, view step updates, and stream logs without leaving the command line.

TeamCity 2026.1: New CLI, AI Agent Integration, Pipelines Upgrades & Security Fixes — Source: blog.jetbrains.com

What is MCP support and why does it matter for AI agents?

MCP (Model Context Protocol) support in TeamCity 2026.1 allows AI coding agents to securely interact with your CI/CD system. By integrating the TeamCity CLI as an agent skill, AI tools can query build status, investigate failures, and even trigger new builds—all while following the same real-time updates you see in the terminal. This bridges the gap between your development and operations, letting AI assistants help with troubleshooting and pipeline management directly from your IDE or command line.

How have Pipelines been enhanced in this version?

TeamCity 2026.1 introduces several upgrades to Pipelines that make configuration more convenient and powerful. While the original announcement doesn’t enumerate every tweak, it emphasizes that the new CLI and MCP capabilities integrate seamlessly with Pipelines—allowing you to script pipeline operations, inspect build steps, and automate workflows from the terminal. Additionally, the CLI’s pipeline commands let you define and modify pipeline configurations without navigating the web UI, boosting productivity for teams that prefer code-driven setup.

What security vulnerability was fixed in TeamCity 2026.1?

A high-severity post-authentication vulnerability (CVE-2026-44413) was discovered in TeamCity On-Premises. It could allow any authenticated user to expose parts of the TeamCity server API to unauthorized users. All on-premises versions are affected; TeamCity Cloud is not impacted and requires no action. The issue is fixed in version 2026.1, and a security patch plugin is available for TeamCity 2017.1+ for those unable to upgrade immediately. Upgrading or installing the patch is strongly recommended.

Is the AI Assistant available in TeamCity 2026.1?

Yes, the AI Assistant is now available in Enterprise trial accounts as of this release. It brings intelligent suggestions and automation to your TeamCity workflows, helping you analyze builds, diagnose issues, and optimize pipelines. This feature is part of JetBrains’ broader push to integrate AI into DevOps, complementing the new CLI and MCP support for AI agents.

What about the SAML authentication plugin?

The SAML authentication plugin now comes bundled with TeamCity 2026.1. Previously an optional add-on, it is included out of the box, simplifying single sign-on (SSO) setup for organizations using SAML identity providers. This change removes the need for manual plugin installation and reduces initial configuration overhead.

When is the TeamCity 2026.1 livestream and what will it cover?

JetBrains is hosting a dedicated livestream on May 12, 2026, from 10:00 AM to 11:00 AM (timezone TBD). During this one-hour event, the TeamCity team will walk through all new features in 2026.1, including the CLI, MCP support, pipeline enhancements, AI Assistant, and security updates. They’ll also share their development roadmap for the rest of 2026. You can register for the livestream via the official JetBrains blog post.

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