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Prowlarr MCP server

by rollecode

list_applications_schema

Read-onlyIdempotent

Retrieve the application schema from Prowlarr to see all available fields, types, and constraints for configuring applications.

Instructions

Read Application.

GET /api/v1/applications/schema

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault

No arguments

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
resultYes

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv1.0.0

TDQS

C2.7/5.0
Behavior2/5

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

Annotations already declare readOnlyHint, idempotentHint, and destructiveHint. The description merely restates 'Read' and adds no behavioral details beyond the annotations, such as response characteristics or any special behaviors.

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

Conciseness3/5

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

The description is extremely short but not elegantly so. 'Read Application.' is brief but vague, and the URL line comes second. It is appropriately small, but the first sentence could be more informative and structured around the schema aspect.

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?

The description does not explain the purpose of returning the schema, how it relates to invoking other application APIs, or when this is preferable to list_applications. Given the tool has a simple parameter list and annotations, the description still lacks enough context for correct usage.

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

Parameters4/5

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

The tool has zero parameters, so the schema empty and coverage is 100% in a vacuous sense. The rubric gives baseline 4 for 0 params; description doesn't need parameter details.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose3/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description states a read verb and the resource ('Application') with an explicit endpoint path containing '/schema', which indicates schema retrieval. However, it never explicitly says it returns the schema, and the phrasing 'Read Application' is too terse to clearly distinguish from other read tools like get_applications_by_id.

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?

There is no guidance about when to use this tool versus list_applications, list_applications_schema, or the other list_*_schema siblings. No conditions or alternatives are mentioned.

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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