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redis

Redis MCP Server

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by redis

json_get

Retrieve a JSON value stored in Redis using 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, but the description mentions default path and that it returns an error message on failure. It lacks details on behavior if key missing or path invalid, and does not confirm idempotency or side effects.

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 concise, using two sentences for the summary followed by a clear Args/Returns structure. Every sentence adds value, no redundant text.

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 presence of an output schema, the description adequately covers return values. However, it omits edge cases and potential errors beyond a generic error message, leaving room for improvement.

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

Parameters5/5

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

With 0% schema description coverage, the description adds meaningful explanations for both parameters: 'name' as key, 'path' as JSON path with default. This fully compensates for the schema gap.

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 'Retrieve a JSON value from Redis at a given path,' specifying the action and resource. It distinguishes from siblings like json_del and json_set, which are for mutation.

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 reading JSON values but does not explicitly state when to use or avoid this tool, nor does it mention alternatives or prerequisites.

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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