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Radarr MCP server

by rollecode

create_metadata_action_by_name

Idempotent

Creates metadata for a specified action name using the provided payload. Set up or modify metadata configurations directly through the Radarr API.

Instructions

Create Metadata.

POST /api/v3/metadata/action/{name}

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

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
bodyYes
nameYes

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
resultYes

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv1.0.0

TDQS

B3/5.0
Behavior3/5

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

Annotations already declare readOnlyHint=false, idempotentHint=true, and destructiveHint=false, so the safety profile is covered. The description adds a meaningful behavioral pointer: the body fields are dynamic and should be discovered from the matching GET or schema endpoint. It does not disclose auth requirements or side effects, but the annotations carry much of that burden.

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 compact and front-loaded with the endpoint, followed by minimal parameter explanations. Every line serves a purpose, and there is no redundant prose.

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?

Given the open-ended body and the presence of an output schema, the description points to the right discovery mechanism and covers invocation prerequisites reasonably well. However, it does not explain what a metadata action is, what name refers to, or how this call fits into the broader metadata lifecycle, leaving some context gaps for an agent choosing this tool.

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?

Schema coverage is 0%, and the body is an open additionalProperties object, so the description must compensate. It does clarify that name is a path parameter, body is the request payload, and that the body's expected fields should be discovered via GET or /schema. This is helpful, but it leaves the semantics of 'name' and the actual body structure almost entirely to external discovery.

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 says 'Create Metadata.' and gives the endpoint, which identifies the resource and HTTP method, but it never explains what a 'metadata action' is or how this differs from the sibling create_metadata tool. The resource is vaguely described and the purpose is not substantially clearer than the tool name.

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 on when to use this tool versus alternatives like create_metadata, create_metadata_test, or other create_* tools. The instruction to 'Read the matching GET or the /schema endpoint first' is a useful prerequisite but does not help an agent decide between this tool and its siblings.

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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