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Config Set

config_set

Set a single Drupal configuration value by name and new value to directly modify site settings.

Instructions

Set a single configuration value.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
nameYes
valueYes

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault

No arguments

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv0.1.0

TDQS

C2.6/5.0
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 behavioral burden. It does not say whether setting a value overwrites prior state, whether the change is persisted immediately, what permissions or cache implications apply, or how the nested value object is interpreted. For a mutation tool with zero annotation coverage this is a significant gap.

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

Conciseness3/5

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

The single sentence is front-loaded and free of waste, so structure is fine. But it is under-specified rather than genuinely concise; the same length could have carried the essential format and scope details.

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?

An output schema exists, so return values need not be explained, but the tool is a state-mutating operation with an undocumented nested-object parameter and no annotations. The description omits virtually all of the behavioral and parameter context an agent would need to invoke it correctly.

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 neither parameter is documented. The description hints that there is a single (name, value) pair, but adds no meaning about the expected format of 'name' (machine name, config object path) or the structure of the nested 'value' object, so it fails to compensate for the coverage 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 gives a specific verb ('Set') and resource ('a single configuration value', qualified as single). An agent can tell it apart from config_get by the write verb. However, it does not distinguish itself from siblings like import_config, sync_config, or config_set leaf naming, so it stops short of full sibling differentiation.

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 on when to use this tool versus config_get, import_config, sync_config, or split_config, nor any mention of prerequisites or the scope of what 'single value' means in practice. Usage must be inferred purely from the name.

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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