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Blender MCP Plus

Blender MCP Plus

by lusilong
OverviewSchemaSourceRelated ServersDiscussionsAdmin
Python
Local

render_thumbnail_to_path

Destructive

Render a small, low-quality thumbnail to a specified output path, temporarily overriding scene settings to quickly preview a Blender project.

Instructions

Render a small, low-quality thumbnail to output_path (temporarily overrides settings).

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": {
      "output_path": "<output_path>"
    },
    "name": "render_thumbnail_to_path"
  }
}

Input Schema

NameRequiredDescriptionDefault
output_pathYes

Output Schema

NameRequiredDescriptionDefault

No arguments

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv1.0.3

TDQS

B3/5.0
Behavior3/5

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

Annotations already declare destructiveHint=true, and the description adds that it temporarily overrides settings, which is useful context. However, it does not elaborate on the nature of the destruction (e.g., file overwrite) or any other side effects beyond the temporary override. The description does not contradict annotations.

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 sentence with no fluff. It front-loads the primary action and target, and the parenthetical about overriding settings is efficient. Every word adds value.

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?

The tool is simple but the description leaves significant gaps: no usage guidance, no parameter semantics, and no mention of what happens to existing files at the output path. The existence of an output schema is noted but the description does not help an agent understand the tool's role among the many rendering and screenshot siblings.

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 the description does not compensate. It only repeats 'output_path' without clarifying expected format, file extension, whether the path must exist, or overwrite behavior. With a single required parameter, some elaboration is expected but absent.

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 states a specific action (render) on a specific resource (a small, low-quality thumbnail) and the target (output_path). It is clear and distinct from sibling tools like render_viewport_to_path, though it does not explicitly name the alternative.

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?

The description provides no guidance on when to use this tool versus alternatives such as render_viewport_to_path or get_screenshot_of_area_as_image. It only mentions a temporary override of settings, which hints at context but does not offer explicit selection criteria or exclusions.

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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