How to Use the Deterministic Datetime Engine MCP in Windsurf

Q: How do I install the Deterministic Datetime Engine in Windsurf?

Use the MCP Servers UI under Settings, or edit your /.codeium/windsurf/mcpconfig.json file. Add the server details to the mcpServers object and hit refresh. Cascade detects the new tools immediately.

Stop letting LLMs hallucinate date math. Give Windsurf exact temporal tools for deterministic scheduling and time calculations.

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Connect Deterministic Datetime Engine MCP to Windsurf

Create your Vinkius account to connect Deterministic Datetime Engine to Windsurf and route execution through our secure gateway. The platform manages server hosting, runtime updates, and security layers. Configuration requires no manual server provisioning.

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Setup Deterministic Datetime Engine with Windsurf

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Let Cascade Handle Business Days

The `add_business_days` tool fixes production date math by giving Windsurf a deterministic way to push dates forward while skipping Saturdays and Sundays. Date math breaks in production. You ask an agent to calculate a delivery window, and it forgets weekends exist. Cascade reads your prompt, realizes it needs a delivery date, and hits the tool directly. It passes the start date and the integer count. You get a mathematically correct target date back, without writing a custom Python script to verify it.

Calculate Absolute Date Differences

The `calculate_date_difference` tool forces the agent to use actual math instead of guessing the gap between two timestamps. LLMs guess when you ask them how many days passed between two dates. They approximate months and create bugs. You tell Windsurf to audit a log file and flag accounts older than ninety days. Cascade parses the timestamps, feeds them into the tool, and gets a hard number. No hallucinations. No off-by-one errors.

Windsurf MCP Server for Leap Years

The `check_leap_year` tool applies strict Gregorian rules locally because century boundaries always ruin calendar logic. The year 2000 was a leap year; 1900 wasn't. Most developers forget this. When your agent builds a scheduling feature, it needs to know if February has 29 days. Cascade queries this MCP Server, gets a boolean response, and moves on. The logic executes completely within your local environment.

Setup guide

Set up Deterministic Datetime Engine MCP in Windsurf

Prerequisites

Windsurf IDE installed (macOS, Windows, or Linux)
Active Vinkius subscription with a valid endpoint token

1

Open MCP configuration

Click the Cascade assistant icon in the sidebar, then click the hammer icon (🔨) at the top of the panel. Select "Configure" to open ~/.codeium/windsurf/mcp_config.json.
2

Add the Deterministic Datetime Engine MCP

Paste the JSON snippet shown on the right into the mcpServers object. Replace [YOUR_TOKEN_HERE] with your endpoint token from cloud.vinkius.com.
3

Refresh MCPs

Go back to the hammer icon (🔨) in Cascade and click "Refresh". Windsurf will detect the new server. No full restart is needed — the connection is hot-reloaded.
4

Verify in Cascade

Start a new Cascade conversation and ask something like "Show my Deterministic Datetime Engine payment history." If connected, Cascade will call the Deterministic Datetime Engine tools directly. You will see a green dot next to the server name in the MCP panel.

mcp_config.json

{
  "mcpServers": {
    "deterministic-datetime-engine-mcp": {
      "url": "https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp"
    }
  }
}

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Common questions about Deterministic Datetime Engine MCP in Windsurf

Use the MCP Servers UI under Settings, or edit your `~/.codeium/windsurf/mcp_config.json` file. Add the server details to the `mcpServers` object and hit refresh. Cascade detects the new tools immediately.

No. This engine strictly handles absolute date arithmetic. If you need timezone conversions, you have to manage those offsets before feeding the raw dates into the tools.

The engine only skips standard weekends. It does not pull external holiday calendars. You get raw business day math based on a Monday-through-Friday week.

Because language models cannot do math reliably. They predict text. Passing the raw dates to a local tool guarantees you get a mathematically correct answer every single time.

Nothing leaves your machine. The raw timestamps and integer offsets you provide stay entirely local. The engine processes the temporal data in memory and returns the result without making a single network call.

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