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kanopi

Campaign Monitor MCP Server

by kanopi

cm_update_custom_field_options

Idempotent

Update the selectable options of a multi-valued custom field in a Campaign Monitor list. Provide the list ID, custom field key, and new options; optionally keep existing options.

Instructions

Update the selectable options of a multi-valued custom field.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
listIdYesList ID.
OptionsYesThe new set of options.
customFieldKeyYesCustom field key, e.g. '[MyField]'.
KeepExistingOptionsNoIf true, add to existing options instead of replacing them.
Behavior4/5

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

Annotations declare idempotentHint=true, so description does not need to restate idempotence. It adds context about multi-valued field and the 'KeepExistingOptions' parameter indicates behavior. No contradictions.

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?

Single sentence of 10 words with no wasted content. Efficiently communicates the core purpose.

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?

Adequate but lacks details on prerequisites (e.g., field must be multi-valued), error conditions, or limits. Schema coverage compensates partially, but some gaps remain.

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 covers 100% of parameters with descriptions. The description does not add additional meaning beyond what the schema already provides, meeting baseline expectations.

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

Purpose5/5

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

Description clearly states the verb 'update' and the resource 'selectable options of a multi-valued custom field'. It distinguishes from sibling 'cm_update_custom_field' by specifying 'options'.

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?

No explicit guidance on when to use or alternatives. The context implies it is used for updating options, but no exclusion criteria or prerequisites are provided.

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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