# iCalendar Syntax Validator MCP for AI Agents AI Agent Connect

> iCalendar Syntax Validator MCP ensures your ICS files are structurally sound and follow strict temporal formatting. It catches broken component boundaries, missing mandatory fields like UID, and invalid date-time strings before they break your calendar integrations.

## Overview
- **Category:** productivity
- **Price:** Free
- **Endpoint:** https://edge.vinkius.com/vk_preview_wLIP6aYDkdlrYy0W5yucP1fzZOl4WMJGEmctEZrd/ai-agent-connect
- **Tags:** icalendar, ics, validation, calendar, syntax

## Description

Writing calendar files manually or generating them through code is a minefield of tiny syntax errors. One missing closing tag or a single misplaced character in a timestamp can make an entire event stream unreadable to calendar applications. This MCP acts as a specialized debugger for your calendar data. Instead of guessing why an event won't import, you can hand the raw text to your AI client to scan for structural flaws. It looks for broken nesting in components like VEVENT or VTODO and makes sure every block is properly closed. It also checks that the essential metadata required by the iCalendar standard is actually there. If a date is formatted incorrectly or a mandatory field is missing, you get the exact line number where the error lives. By connecting this to your workflow through the Vinkius catalog, you stop fighting with broken ICS files and start producing reliable calendar data that works every time.

## Tools

### check_date_time_syntax
Scans the document to ensure all date and time properties follow the strict iCalendar temporal format.

### validate_icalendar_structure
Checks the high-level structural integrity and nesting of the iCalendar string.

### verify_component_properties
Validates that the required properties exist within specific component blocks.

## Prompt Examples

**Prompt:** 
```
Is this ICS string structurally valid: 'BEGIN:VEVENT
UID:123
DTSTAMP:20230101T000000Z
END:VEVENT'
```

**Response:** 
```
Yes, the structure is valid. 

**Validation Summary:**
* **Structure:** All components are correctly opened and closed.
* **Mandatory Fields:** UID and DTSTAMP are present.
* **Syntax:** Temporal formatting is correct.
```

**Prompt:** 
```
Check if this VEVENT has the required UID and DTSTAMP properties.
```

**Response:** 
```
The component is missing the required **UID** property.

**Error Details:**
| Property | Status |
| :--- | :--- |
| UID | ❌ Missing |
| DTSTAMP | ✅ Present |
```

**Prompt:** 
```
Validate the date-time syntax in this string: 'BEGIN:VEVENT
DTSTART:2023-13-01
END:VEVENT'
```

**Response:** 
```
Syntax error detected in the date-time property.

**Error Report:**
* **Error:** Invalid date format.
* **Location:** `DTSTART:2023-13-01` 
* **Reason:** Month '13' is out of range.
```

## Capabilities

### Fix broken calendar structures
Identify where component blocks like VEVENT or VJOURNAL fail to close properly.

### Verify mandatory event fields
Check that every component contains the required UID and DTSTAMP properties.

### Validate temporal formatting
Scan date and time strings to ensure they follow strict iCalendar standards.

### Locate syntax errors
Get specific line numbers for any detected structural or formatting issues.

### Audit component nesting
Ensure that nested calendar elements are organized according to the specification.

## Use Cases

### Debugging broken event exports
A developer generates an ICS file that won't import into Google Calendar; they ask their agent to find the structural error.

### Automating calendar data cleaning
An engineer needs to verify that thousands of migrated calendar records have the required UID and DTSTAMP fields.

### Validating scheduled task formats
A system generates VTODO entries and needs to ensure the time formats are strictly compliant before sending them to users.

### Testing calendar API outputs
A QA engineer uses the MCP to verify that a new scheduling service is producing valid iCalendar strings.

## Benefits

- Stop guessing why calendar imports fail by getting exact line numbers for syntax errors.
- Ensure every VEVENT and VTODO block is properly closed using validate_icalendar_structure.
- Prevent missing metadata errors by running verify_component_properties on every block.
- Eliminate timestamp errors by using check_date_time_syntax to catch invalid date formats.
- Speed up debugging cycles for calendar-based automation and scheduling tools.

## How It Works

The bottom line is you get an instant, line-by-line audit of your calendar files to prevent import failures.

1. Paste your raw iCalendar text or ICS content into your AI client.
2. Ask your agent to check the file for structural integrity or specific field errors.
3. Receive a detailed report pinpointing exact line numbers and the nature of any syntax violations.

## Frequently Asked Questions

**How can I use the iCalendar Syntax Validator MCP to fix my calendar files?**
You can provide your raw ICS text to your AI client and ask it to check for structural errors or missing fields. It will identify exactly where the file is broken so you can fix it.

**Can the iCalendar Syntax Validator MCP find errors in my event timestamps?**
Yes. It specifically checks that all date and time properties follow the strict iCalendar temporal format, catching invalid months or incorrect time strings.

**Will the iCalendar Syntax Validator MCP tell me why my ICS file won't import?**
Yes. It identifies structural failures like unclosed components or missing mandatory fields like UID, which are common reasons for import failures.

**Does the iCalendar Syntax Validator MCP work with VTODO and VJOURNAL components?**
Yes. It validates the structural integrity and mandatory properties for all standard iCalendar components, including VEVENT, VTODO, and VJOURNAL.

**Can I use this iCalendar Syntax Validator MCP to check for missing metadata?**
Yes. It can verify that specific component blocks contain all the required properties needed for a valid calendar entry.

**What component types are supported?**
The validator specifically supports VEVENT, VTODO, and VJOURNAL components.

**How can I find where an error occurred in my ICS file?**
The tools return the exact line number where the structural, property, or syntax error was detected.

**Does this tool check for mandatory properties?**
Yes, you can use `verify_component_properties` to ensure that mandatory properties like UID and DTSTAMP are present in your components.