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Yuchenhui

Redis MCP Server

by Yuchenhui

json_get

Retrieve a JSON value from Redis by providing a key and an optional JSON path.

Instructions

Retrieve a JSON value from Redis at a given path.

Args: name: The Redis key where the JSON document is stored. path: The JSON path to retrieve (default: root '$').

Returns: The retrieved JSON value or an error message.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
nameYes
pathNo$

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
resultYes
Behavior3/5

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

No annotations provided, so description must disclose behavioral traits. It indicates read-only operation ('Retrieve') and mentions error messages, but lacks details on side effects, permissions, or performance.

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?

Description is brief and front-loaded with purpose, followed by Args and Returns sections. It avoids unnecessary detail but could be more streamlined.

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

Completeness4/5

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

Given the simplicity of the tool (read JSON from Redis) and existence of an output schema, the description adequately covers usage and parameters.

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?

Description adds minimal value beyond schema by naming parameters in Args docstring, but schema coverage is 0%. It explains name as Redis key and path as JSON path, which is sufficient for basic understanding.

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 action (Retrieve), the resource (JSON value from Redis), and the path parameter, distinguishing it from sibling tools like json_del and json_set.

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 on when to use this tool vs alternatives like get or json_set. No context on prerequisites or when not to use.

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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