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Radarr MCP server

by rollecode

delete_system_backup_by_id

DestructiveIdempotent

Delete a specific Radarr system backup by supplying its ID to remove it and free up storage space.

Instructions

Delete Backup.

DELETE /api/v3/system/backup/{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

C2.8/5.0
Behavior2/5

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

The annotations already carry destructiveHint=true, idempotentHint=true, and readOnlyHint=false, so the safety profile is known. However, the description adds no behavioral context on top of that - it does not say the backup is permanently removed, whether it is recoverable, or that an existing backup ID is required.

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 and ordered: a one-line summary, the API endpoint, and the parameter mapping. The first sentence is redundant with the tool name, but the endpoint and path-parameter note are genuinely useful and the overall length is appropriate.

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 single-parameter destructive tool with annotations and an output schema, the execution path is mostly clear. The description does not state the irreversible nature of deleting a backup or suggest retrieving the ID first, which is a moderate gap for an agent deciding how to use the tool effectively.

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?

Schema description coverage is 0%, and the only added parameter information is 'id: Path parameter'. While this is a useful structural detail, it does not describe what the id represents, what IDs are valid, or the semantic relationship to the backup entity, so it gives only minimal compensation for the schema gap.

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 says 'Delete Backup' and gives the DELETE endpoint, which is an explicit verb and resource. It is unambiguous about what the tool does and is distinct from sibling backup tools, though it leaves the 'system backup by id' precision to the tool name and path rather than stating it directly.

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 such as create_system_backup_restore_by_id or list_system_backup. No prerequisites, exclusions, or context are given, so an agent must infer selection from the raw operation alone.

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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