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Arenukvern

Flutter Inspector MCP Server

inspector_set_pub_root_directories

Sets the root directories for pub packages in a Flutter app to enable accurate widget tree inspection and navigation analysis.

Instructions

RPC: Set the root directories for pub packages (ext.flutter.inspector.setPubRootDirectories)

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
portNoPort number where the Flutter app is running (defaults to 8181)
directoriesYesList of root directories for pub packages
Behavior2/5

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

No annotations are provided, so the description must disclose behavioral traits. It only states the action (set) without mentioning whether it overwrites existing directories, requires permissions, or any side effects. This is insufficient for safe agent usage.

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

Conciseness4/5

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

The description is a single sentence, concise and to the point. It includes the RPC identifier which is not essential for understanding, but overall there is no wasted text.

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?

Given the tool's complexity (setting root directories that affect pub resolution) and the absence of output schema, the description lacks important context such as that this replaces the current list, that it requires a running Flutter app, or what the expected outcome is.

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 has 100% description coverage for both parameters, so the schema already documents them adequately. The description adds no extra meaning beyond the schema; it merely restates the tool's purpose. Baseline score of 3 is appropriate.

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 'Set the root directories for pub packages', which indicates the verb 'set' and the resource. However, it does not explicitly differentiate from sibling tools like inspector_add_pub_root_directories and inspector_remove_pub_root_directories, which could cause confusion about whether 'set' replaces or updates the list.

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?

No usage guidelines are provided. The description does not indicate when to use this tool versus the add or remove variants, nor does it mention any prerequisites or typical scenarios.

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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