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rollecode

Radarr MCP server

by rollecode

get_customformat_by_id

Read-onlyIdempotent

Retrieve a specific custom format's details by ID to inspect its rules and configuration in Radarr.

Instructions

Read CustomFormat.

GET /api/v3/customformat/{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

B3.3/5.0
Behavior3/5

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

Annotations already disclose readOnlyHint, idempotentHint, and destructiveHint=false, so the safety profile is covered. The description adds only the HTTP GET method and path parameter, which is consistent but does not add behavioral context such as response shape or pagination (output schema covers response). No contradiction.

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?

Extremely compact with the main action front-loaded. The endpoint and Args block are directly useful, though the endpoint line partially repeats the 'Read' intent.

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 operation with output schema and safe annotations, the description is nearly sufficient. However, it lacks any context on when to choose this over list_customformat or get_customfilter_by_id, and it does not elaborate what the returned CustomFormat represents.

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?

Schema description coverage is 0%, so the description must compensate. It identifies 'id: Path parameter', clarifying that the single required parameter belongs in the URL path rather than the query body, which goes beyond the bare schema property.

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 a clear verb and resource ('Read CustomFormat') and includes the exact endpoint GET /api/v3/customformat/{id}, which identifies a single-resource read. It does not explicitly contrast with list_customformat or other read siblings, so it misses full differentiation.

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?

No guidance is given about when to use this tool versus the many sibling list/update/delete customformat tools or other get_*_by_id tools. The agent must infer usage from the name and endpoint.

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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