Install and update your tools

Yardmaster and your agents use programs installed on your computer: Claude Code itself, Git, the GitHub CLI and others. The CLI Tools list shows which ones you have and installs or updates the rest for you.

Install or update a tool#

1. 1

   In the sidebar, open Agent Tools > CLI Tools.

2. 2

   Find the tool in the list, or type in Search tools.... Installed tools come first.

3. 3

   Click the tool, then Install, Update or Log In. A tool with no automatic installer offers View Instructions instead.

To handle everything at once, open Settings > Connected Tools: Check Updates looks for new versions, then Install All Missing and Update All do the rest.

When a model needs a newer Claude Code#

Some Claude models only run on a recent Claude Code. When yours is too old, the model picker greys that model out with "Needs Claude Code CLI" and the version, and an Inbox card links here. Click Update on Claude Code CLI, then switch back to Yardmaster when it finishes; the check runs again by itself. See A session will not start.

Check your MCP servers#

MCP servers give your agents extra tools. Agent Tools > MCP Servers lists yours. An enabled server that keeps failing to start gets a red Failing badge, and one that keeps needing a login gets an amber Sign in badge. Select it to see how often it failed, its last error and a likely cause.

Sign in once for every engine#

Some remote MCP servers, such as Mobbin, need you to sign in. Select the server in Agent Tools > MCP Servers and click Sign in for all engines, then finish signing in in the browser that opens. Yardmaster keeps that sign-in encrypted on this computer, and Codex, Antigravity and other agents that reach the server through Yardmaster all use it. Servers with a key in their address, such as Zapier, need no sign-in. Claude sessions still use Authenticate in Claude. Sign out removes the sign-in from this computer.

If an agent needs you to sign in, it asks with a card in your Inbox. Nothing opens until you approve it on this computer, because that is where the browser opens.

Test every tool#

Click Test every tool in Agent Tools > MCP Servers to see which engines can use each server you turned on. Yardmaster connects to every server and lists its tools, then shows Ready, Needs sign-in, Failed or Not enabled for Claude, Codex and Antigravity, with the reason underneath. It never runs a tool. Claude's answer comes from its recent sessions, so a new server shows Not checked yet until a Claude session uses it.

Not enabled means that engine is not installed on this computer, or you turned it off: Show alternative AI providers is off in Settings > Accounts, or you hid it from the new-session picker. Failed with "not allowed" means you are signed in, but your account's plan does not include that server or tool.

Why did I get an MCP Overhead alert?#

Every MCP server you turn on adds its tool descriptions to every message your agents send, and uses memory while a session runs. Yardmaster puts one amber MCP overhead row in your Inbox when your servers add more than about 25,000 tokens (an estimate), use more than 1,500 MB of memory in running sessions, or 3 or more of them have not been used in 30 days.

Open the row to see each server's share and which ones were never used. Click Manage MCP servers to turn off the ones you do not need, or Dismiss to hide it until your servers grow by about half again or 30 days pass. To change the limits (0 turns a check off) or turn the alert off, open Settings > Notifications > MCP Overhead.

See your Claude Code plugins#

Agent Tools > Claude Code plugins shows which Claude Code plugins are installed on this computer and which ones each running session loaded. It only shows them; it never installs or changes anything. Plugins marked Mod run in every Claude session with your permissions and can approve actions without asking you, so check that you trust them.