Liner announced Liner Actions MCP, a unified connector that gives AI agents access to more than 1,100 verified applications through a single integration. The service works with agents such as Claude and ChatGPT, allowing users to connect services, retrieve information and complete tasks across multiple apps using natural-language prompts.
Connecting AI agents to external applications has traditionally required users to find individual Model Context Protocol (MCP) servers, follow installation instructions and manage API keys for each service. Liner Actions MCP eliminates that process, allowing users to connect an account with a single login when an agent first needs to access it.
MCP has emerged as a standard for connecting AI agents to external tools and services. However, the growing number of available servers has made setup and maintenance increasingly complicated. Liner Actions MCP addresses this challenge with one connection to a catalog of more than 1,100 tools spanning services such as Slack, Notion and calendar applications.
Liner says it individually tested every tool in its catalog across multiple environments to verify that the integrations work. This approach is intended to reduce the failed connections and troubleshooting that can undermine agent workflows.
Once connected, agents can identify and activate the tools needed to complete a request, including tasks that span multiple applications. For example, a user could ask an agent to summarize a week’s discussion in a Slack marketing channel and save the results in Notion. The agent identifies the required services, retrieves the relevant information and completes the task without requiring users to configure each integration in advance.
Tools load when needed rather than all at once, helping limit the amount of unnecessary context an agent must process. This can make it easier for agents to manage multi-step tasks across multiple services from a single prompt.
Liner Actions MCP operates as a relay between an AI agent and each service’s MCP server. According to Liner, the system does not store user data, and any logs generated during operation are de-identified and designed to prevent Liner from viewing the details of users’ activity.
API for developers building AI agents
In addition to the MCP connector, Liner offers the Liner Actions API, which enables companies developing their own AI agent products to connect to the same catalog of approximately 1,100 services. Liner Write, the company’s AI writing tool, already incorporates connector capabilities built on the API.
Liner Actions MCP and the Liner Actions API are currently free and support both Korean and English.
