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Radarr MCP server

by rollecode

create_downloadclient

Idempotent

Registers a download client in Radarr using the provided configuration payload. Establishes the connection for Radarr to send download requests.

Instructions

Create DownloadClient.

POST /api/v3/downloadclient

Args: body: Request payload. Read the matching GET or the /schema endpoint first to see the fields this resource expects. force_save: Query parameter.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
bodyYes
force_saveNo

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
resultYes

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv1.0.0

TDQS

B3.3/5.0
Behavior2/5

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

Annotations already declare idempotentHint=true, readOnlyHint=false, and destructiveHint=false, so the safety profile is known. The description adds only the HTTP endpoint and a pointer to the schema, with no side-effect, error, or auth context; it neither reinforces nor explains the idempotent behavior.

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?

The description is short, front-loaded with the purpose, and structured with a clear Args block. Each line adds at least endpoint or parameter-location context, though the force_save line is thin and mostly restates schema 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 an open-bodied create call with zero schema description coverage, the pointer to GET/schema is the critical missing piece and is present. Still, force_save semantics and the relationship to sibling test/update endpoints are left unexplained, so an agent would need to infer or probe those details.

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

Parameters2/5

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

The body parameter gets a meaningful directive—read the matching GET or /schema endpoint first—which is valuable because the schema shows an open object with additionalProperties. However, force_save is only labeled 'Query parameter' with no semantics, and schema description coverage is 0%, so the description does not fully compensate.

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 opens with the imperative 'Create DownloadClient' and confirms it with the explicit POST endpoint, giving a specific verb and resource. This is unambiguous against siblings like create_downloadclient_test or update_downloadclient_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 Guidelines3/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The use case is implied—create a download client—but the description never states when to prefer this over the sibling test endpoints or when not to use it. The instruction to read the matching GET or /schema endpoint is a useful prerequisite, but no explicit alternative routing 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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