FavCRM

delete_custom_field

Destructive

Delete a custom field definition and its stored values.

Tool call template

Replace each placeholder with a value matching the input schema. Only required parameters are included; add optional parameters as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {
      "definitionId": "<definitionId>"
    },
    "name": "delete_custom_field"
  }
}

Input Schema

Name	Required	Description	Default
`definitionId`	Yes	Custom field definition ID

Output Schema

Name	Required	Description
`data`	Yes	Tool result payload — shape varies per tool, see the tool description
`summary`	Yes	One-line human-readable summary of the action
`renderType`	Yes	UI rendering hint for the result

Schema Changelog

Changes observed during successful MCP inspections.

AddedJun 26, 2026

TDQS

A4.1/5.0

Behavior4/5

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

Annotations already indicate destructiveHint=true, but the description adds important context by specifying that stored values are also deleted, not just the definition. This clarifies the full scope of the destructive action.

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 words. It earns its place by capturing both the primary action and a critical side effect.

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

Completeness5/5

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

Given the simplicity of the tool (one parameter, output schema present, destructiveHint annotation), the description is fully sufficient. It covers what is deleted and the existence of stored values, which is key context for an agent.

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?

The input schema provides 100% coverage with a clear description for definitionId. The tool description does not add additional parameter semantics beyond what the schema already states.

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?

The description uses a specific verb and resource: "Delete a custom field definition and its stored values." It clearly distinguishes this from update_custom_field, get_custom_field, and set_custom_field_values by stating exactly what is removed.

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 description implies when to use the tool (when you want to permanently remove a custom field and its data), but it does not provide explicit alternatives or exclusions. For instance, it doesn't mention that updating the field might be preferable if you want to keep the stored values or that set_custom_field_values could be used to clear values only.

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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