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Radarr MCP server

by rollecode

get_metadata_by_id

Read-onlyIdempotent

Get metadata for a movie by its ID from Radarr, enabling direct retrieval of metadata details.

Instructions

Read Metadata.

GET /api/v3/metadata/{id}

Args: id: Path parameter.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
idYes

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
resultYes

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv1.0.0

TDQS

B3.2/5.0
Behavior3/5

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

Annotations already declare readOnlyHint=true, idempotentHint=true, and destructiveHint=false, so the safety profile is covered. The description adds the HTTP method and path parameter but does not disclose response behavior, error cases, or what the metadata represents. No contradiction with annotations.

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 minimal and clearly structured with a summary, endpoint, and args section. There is no filler or redundancy, though the terseness leaves out sibling routing and domain context.

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 a simple one-parameter read tool with output schema and annotations, the description is nearly sufficient to make a correct call. It lacks context about what 'metadata' refers to and does not relate to list_metadata, but the endpoint and path parameter provide the essential mechanics.

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 description coverage is 0%, so the description must compensate. It adds that 'id' is a path parameter, which is meaningful location semantics beyond the schema's integer type. However, it does not explain what the ID refers to or provide any constraints or format details beyond the obvious.

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

Purpose4/5

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

The description states 'Read Metadata' and provides the exact endpoint GET /api/v3/metadata/{id}, making it clear this fetches a single metadata resource by ID. It does not explicitly distinguish itself from list_metadata or other get_*_by_id siblings, but the endpoint and name convey the core operation.

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 alternatives. It does not mention that list_metadata should be used to retrieve all metadata, or that this tool requires a known ID. The intended usage is only implied by the path parameter.

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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