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eitan3

Gmail + Calendar MCP Server

by eitan3

get_colors

Retrieve color palettes for calendars and events, mapping color IDs to hexadecimal values.

Instructions

Get the calendar and event color palettes (colorId -> hex values).

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
accountNo
passwordNo
Behavior2/5

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

No annotations are provided, so the description should fully disclose behavioral traits. It only states what the tool does (returns color palettes) without mentioning side effects, authentication requirements, rate limits, or that it is likely a read-only operation. The presence of 'account' and 'password' parameters suggests authentication is needed, but this is not clarified.

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, efficient sentence that immediately conveys the core functionality. There is no extraneous information, and it is front-loaded with the key information.

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?

For a simple retrieval tool, the description adequately explains the return value (colorId to hex mapping). However, it lacks context on authentication, output structure details, and any usage constraints. With no output schema, a bit more detail on the response format would improve completeness.

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

Parameters1/5

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

The input schema has 0% description coverage, and the tool description does not explain the purpose or usage of the 'account' and 'password' parameters. This is a significant gap, leaving the agent to guess their role (likely authentication) without any guidance.

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 retrieves calendar and event color palettes, mapping colorId to hex values. It uses a specific verb ('Get') and resource, and no sibling tools have a similar purpose.

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 does not provide any guidance on when to use this tool versus alternatives, nor does it mention prerequisites or exclusions. Since there are no sibling tools for colors, the lack of explicit usage context is acceptable but not ideal.

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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