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

Annotations already declare the mutation profile (readOnlyHint=false, destructiveHint=false), so the safety bar is lower. The description does add real behavioral context beyond annotations — that `value: null` resets the field to its default — but omits permission requirements, validation behavior when the value does not match the field definition, and error conditions.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

Two short sentences, action first and the clearing rule second. No filler, no restatement of the title, everything front-loaded.

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

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

For a 3-param mutation tool with no output schema and annotations covering safety, the description covers the essential 'what' but leaves gaps around permissions, value-vs-field-type validation, and what happens on unknown IDs. Adequate but not complete.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema coverage is 67%, and the description supplies exactly the missing meaning for the trickiest parameter: the null branch of `value` is defined as 'clear back to default', which the schema only expresses as a type union. It adds nothing for automationId/fieldId, but those are already documented.

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

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

States a specific verb pair ('set or clear') and resource ('config field's value'), which is clearly distinct from siblings like updateConfigFieldDefinition, addConfigField, or hideConfigField. It does not explicitly name or contrast those siblings, so it stops short of a 5.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

Usage is only implied: it tells you this sets a value and how to clear it, but never states when to prefer it over updateConfigFieldDefinition (definition-level edits) or restoreConfigField/hideConfigField. No prerequisites or exclusions are given.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.