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Cron Expression MCP Server

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Parse, explain, validate, and generate cron expressions. Convert between human-readable schedules and cron syntax. Show next N execution times. Supports standard 5-field cron and common extensions. Pure computation.

3 tools
Agent guide included
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AI Skill
SKILL.md

Domain knowledge for Cron Expression — workflow patterns, data models, and gotchas for your AI agent.

Cron Expression

Work with cron scheduling expressions: parse them into human-readable descriptions, validate syntax, show upcoming execution times, and generate expressions from natural language descriptions.

Capabilities

  • Explain: Convert a cron expression into plain English (e.g. "0 9 * * 1-5" → "At 09:00 on every day-of-week from Monday through Friday").
  • Validate: Check if a cron expression is syntactically valid and report specific field errors.
  • Next runs: Calculate the next N execution times from a given cron expression and reference date.
  • Generate: Convert a natural language schedule description into a cron expression.

Cron Format

Standard 5-field: minute hour day-of-month month day-of-week

FieldAllowed ValuesSpecial Characters
Minute0-59* , - /
Hour0-23* , - /
Day of Month1-31* , - /
Month1-12 or JAN-DEC* , - /
Day of Week0-6 or SUN-SAT (0=Sunday)* , - /

Gotchas

  • Day-of-week numbering: 0 = Sunday in standard cron. Some systems use 7 for Sunday.
  • Both day fields: Setting both day-of-month and day-of-week creates an OR condition (runs if either matches), not AND.
  • @reboot, @yearly, etc.: Shorthand expressions are expanded to their 5-field equivalents.

Tools in this Server (3)

Cron Expression Explain

Convert a cron expression into a plain English description. Supports standard 5-field cron and shorthand expressions like @daily, @hourly, @weekly.

Cron Expression Next Runs

Calculate the next N execution times for a cron expression. Returns ISO-formatted timestamps for when the cron job would fire, starting from a referen...

Cron Expression Validate

Check if a cron expression is syntactically valid. Returns validation status and details about each field.

Frequently Asked Questions

What is the Cron Expression MCP server?

Parse, explain, validate, and generate cron expressions. Convert between human-readable schedules and cron syntax. Show next N execution times. Supports standard 5-field cron and common extensions. Pure computation. It provides 3 tools that AI agents can use through the Model Context Protocol (MCP).

How do I connect Cron Expression to my AI agent?

Add the MCPBundles server URL to your MCP client configuration (Claude Desktop, Cursor, VS Code, etc.). The URL format is: https://mcp.mcpbundles.com/bundle/cron-expression. Authentication is handled automatically.

How many tools does Cron Expression provide?

Cron Expression provides 3 tools that can be called by AI agents, along with a SKILL.md that gives your AI agent domain knowledge about when and how to use them.

What authentication does Cron Expression require?

Cron Expression uses open data APIs — no authentication required.

Setup Instructions

Connect Cron Expression to any MCP client in minutes

https://mcp.mcpbundles.com/bundle/cron-expression

What is MCP?

Model Context Protocol lets AI tools call external capabilities securely through a single URL. This bundle groups tools behind an MCP endpoint that many clients can use.

Use this bundle in 3 steps

  1. Copy the MCP URL above
  2. Open your AI tool and add a new MCP/connector
  3. Paste the URL and follow any auth prompts

Claude Desktop Users

Skip the manual setup! Use the .mcpb file format for one-click installation. Check the Claude Desktop tab for setup instructions.

Pick your tool tab for exact steps

Select ChatGPT, Cursor, Claude Code, or another tab for copy-paste config.

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Cron Expression MCP Server & Skill — 3 Tools