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hebcal

hebcal-mcp

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by hebcal

jewish-holidays-year

Get a complete list of Jewish holidays for a specified Gregorian year. Input the year and receive all holiday dates.

Instructions

Calculates a list of all Jewish holidays during a Gregorian (civil) year

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
yearYesGregorian year
Behavior2/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

With no annotations, the description carries full burden but provides minimal behavioral details. It does not disclose the format or scope of holidays (e.g., major/minor, including fasts), nor any edge cases like year validity.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is a single sentence, very concise. However, it could be slightly more informative without sacrificing efficiency.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness3/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given the simple input and no output schema, the description is minimally complete. It lacks mention of holiday types or formatting, leaving some ambiguity.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

The single parameter 'year' has a schema description 'Gregorian year', and the tool description adds 'civil' but no additional detail. Schema coverage is 100%, so baseline is 3; the description adds minimal meaning.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the tool calculates a list of all Jewish holidays for a Gregorian year, using a specific verb and resource. It differentiates itself from sibling tools like convert-gregorian-to-hebrew and shabbat-times.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines2/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

No guidance is provided on when to use this tool versus siblings. For example, there is no mention that this tool is for annual holiday lists while torah-portion is for weekly readings.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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