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ConfigCat MCP Server

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create-setting

Create a new feature flag or setting in a Config with a unique key and specified type.

Instructions

This endpoint creates a new Feature Flag or Setting in a specified Config identified by the configId parameter.

Important: The key attribute must be unique within the given Config.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
configIdYesThe identifier of the Config.
requestBodyYes
Behavior2/5

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

No annotations are present, so the description carries full burden. It only mentions key uniqueness, but omits behavioral traits such as required permissions, side effects, idempotency, or error handling on duplicate key.

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?

Two concise sentences with no redundant information. The important uniqueness note is highlighted. Effective front-loading.

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

Completeness2/5

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

Despite the tool's complexity (many parameters, nested objects, no output schema), the description lacks details about request body structure, response format, error scenarios, or required permissions. Incomplete for a creation endpoint.

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 input schema has high description coverage for properties, so the description adds marginal value beyond schema. The mention of key uniqueness is helpful but not extensive.

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?

Description clearly states it creates a new Feature Flag or Setting under a specific Config, and emphasizes the unique key constraint. This distinguishes it from sibling tools like create-config or create-tag.

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 for creation but does not explicitly state when to use this tool vs alternatives like replace-setting or update-setting. No when-not-to-use guidance is provided.

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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