ZennoPoster: browsers of running tasks — Claude Code MCP server
Connects coding agents to active ZennoPoster task browsers via MCP. It allows models to click elements, inspect web pages, and capture screenshots during execution.
Open on GitHubWhat ZennoPoster: browsers of running tasks does
The MCP.Instance server connects external LLM clients directly to browsers running inside ZennoPoster tasks. Through this bridge, an agent can navigate web addresses, inspect DOM nodes, click buttons, and save page screenshots. To hook into task instances instead of the template editor, launch the process with Target=zennoposter pointing to port :5300.
A running ZennoPoster 7.9.3 or higher is required. The server ships as an autonomous win-x64 binary, so you do not need an external .NET installation. ZennoPoster reserves ports 6107 to 6113 for its internal chat assistants. For this reason, standalone client setups must run on assigned external ports such as 6209.
Authorization relies on an ApiKey generated in ProjectMaker under the API keys settings. Place this token in appsettings.json, pass it via environment variables, or provide it on the command line. Inbound Authorization headers are ignored, and the service accepts connections only over loopback.
What it helps with
- click buttons and links in active ZennoPoster task instances
- capture screenshots from running browser automation jobs
- navigate to target pages inside background worker threads
- extract element structures and text from opened tabs
Example prompts for the agent
- Navigate to the target website in the active ZennoPoster task and take a screenshot.
- Click the submit button inside the currently running task browser.
- Inspect the active page DOM and extract the form input fields.
How to install ZennoPoster: browsers of running tasks
Install
The MCP registry has no launch command for it: see the repository README
Step by step, with commands for each platform: How to add an MCP server to Claude Code, Codex, Cursor, VS Code, Gemini CLI and more
Questions about ZennoPoster: browsers of running tasks
How do I install ZennoPoster: browsers of running tasks?
Download the MCP.Instance-v*-win-x64.zip package from the ZennoLab/zennoposter-mcp releases page and unpack it. Create an ApiKey inside ProjectMaker settings, then configure port 6209 and Target=zennoposter in appsettings.json or pass them as launch parameters.
What does ZennoPoster: browsers of running tasks do?
It exposes browser automation controls from active ZennoPoster tasks to AI models. Agents can inspect page elements, trigger clicks, navigate tabs, and capture screenshots.
What are the runtime requirements for this server?
You need Windows x64 and ZennoPoster 7.9.3 or newer. An external .NET runtime is not required because the distributed binary is self-contained.
