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hebcal

hebcal-mcp

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by hebcal

shabbat-times

Calculate Shabbat and holiday candle-lighting and Havdalah times using latitude, longitude, and timezone for a specified date range.

Instructions

Generates Shabbat and holiday candle-lighting and Havdalah times for a given location and date range

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
latitudeYesLatitude as decimal, valid range -90 to +90 (e.g. 41.85003)
longitudeYesLongitude as decimal, valid range -180 to +180 (e.g. -87.65005)
tzidYesOlson timezone ID (e.g. "America/Chicago", "Europe/Moscow")
startDateYesStart date in yyyy-MM-dd format
endDateYesEnd date in yyyy-MM-dd format
Behavior2/5

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

No annotations are provided, so the description carries full burden. It only states the output type (times) without detailing behavioral aspects like output format, handling of remote locations, or error cases. This is minimal transparency.

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

Conciseness5/5

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

The description is a single, concise sentence that front-loads the key action ('Generates Shabbat... times') and provides necessary context. No unnecessary words.

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?

The tool has no output schema and no annotations. The description omits what the output looks like (list of times, possibly with dates) and whether it covers all holidays. It is somewhat complete for a simple query but lacks output details.

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?

Schema coverage is 100% with descriptions for all parameters. The description adds no additional meaning beyond what is in the schema, so a baseline score of 3 is appropriate.

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's purpose: generating Shabbat and holiday times (candle-lighting and Havdalah) for a given location and date range. This distinguishes it from sibling tools like 'daf-yomi' or 'torah-portion'.

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

Usage Guidelines3/5

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

The description implies usage when needing Shabbat/holiday times, but does not specify when not to use it (e.g., for non-holiday dates) or suggest alternatives. It provides no explicit guidance on prerequisites or context.

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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