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set_collection_field

Set a custom field value on a specific record in your Discogs collection. Modify one exact copy without affecting other releases.

Instructions

Set a custom field value on one exact collection copy.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
valueYes
fieldIdYes
folderIdYes
usernameNo
releaseIdYes
instanceIdYes

Schema Changelog

Changes observed during successful MCP inspections. Dates show when Glama detected each change.

  1. First observedv0.3.0

TDQS

B3/5.0
Behavior2/5

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

No annotations are provided, so the description carries the full burden of behavioral disclosure. It reveals a mutation ('set') and a narrow scope, but does not state whether existing values are overwritten, whether the custom field must already exist, what permissions are needed, or what the API returns after the update.

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 a single, front-loaded sentence with no filler: verb, resource, and scope are all present in minimal words. It earns every word.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness2/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

This is a mutation tool with 6 parameters, no output schema, no annotations, and very limited context. The description is not enough for an agent to confidently assemble a correct call because several required identifiers are not explained and no usage/alternative guidance is provided.

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%, so the description must compensate for undocumented parameters. It loosely maps 'custom field value' to fieldId/value and 'exact collection copy' to instanceId, but leaves folderId, releaseId, and username unexplained, and does not clarify the relationship between fieldId and the custom field definition.

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 clearly states the action ('Set') and the resource ('custom field value') on 'one exact collection copy', making the core purpose recognizable. It is specific enough to distinguish from list/get tools, though it does not explicitly contrast with the nearby edit_collection_instance tool.

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 phrase 'on one exact collection copy' implies this is a targeted, single-instance operation rather than a bulk or collection-level one, and 'custom field value' suggests when it applies. However, it does not explicitly say when not to use it or which sibling tool to prefer for other edits to a collection instance.

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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