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DmitriyGolub

threejs-devtools-mcp

by DmitriyGolub

set_dev_port

Idempotent

Change the local development server port that the proxy forwards requests to.

Instructions

Change the local dev server port the proxy forwards to

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
portYesThe dev server port (e.g. 3000, 5173, 8080)
Behavior3/5

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

Annotations already indicate idempotentHint=true and destructiveHint=false. Description adds context (local dev server, proxy forwarding) but no additional behavioral traits like side effects or permissions.

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, no wasted words, front-loaded with action and resource.

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 simple one-param tool with no output schema, description covers purpose and parameter semantics adequately.

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

Parameters4/5

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

Schema has 100% coverage with a clear description. The tool description reinforces context (local dev server, proxy) beyond schema, adding value.

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 uses specific verb 'change' and resource 'local dev server port', clearly distinguishing from sibling set_dev_url which likely sets a URL.

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

Usage Guidelines4/5

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

Implied usage from name and description; context of local dev server port vs. URL is clear, but no explicit contrast with set_dev_url or when-not-to-use guidance.

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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