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Chalkcast

by FredMichel
OverviewSchemaSourceRelated ServersDiscussionsAdmin
Python
Local

render_frame

Renders a single still frame from a Manim scene for quick visual previews, letting you verify the last frame before committing to a full render.

Instructions

Fast single-still preview of a scene (last frame).

Tool call template

This tool declares no required parameters. Add optional parameters from the input schema as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {},
    "name": "render_frame"
  }
}

Input Schema

NameRequiredDescriptionDefault
scene_idNo
project_idNo

Output Schema

NameRequiredDescriptionDefault

No arguments

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv0.1.0

TDQS

C2.8/5.0
Behavior2/5

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

No annotations are provided, so the description must carry the behavioral burden. It only says the tool is fast and produces a single still of the last frame; it does not disclose whether rendering writes files, creates caches, requires permissions, or has other side effects.

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 front-loaded sentence with no padding. It is efficient, though its extreme brevity leaves important details unstated rather than wasting words.

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 output schema means return values need not be explained, but the definition still lacks usage guidance and parameter semantics. With no annotations and 0% schema description coverage, an agent cannot determine how scene_id and project_id should be supplied or when this tool is preferred over render_scene.

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

Parameters1/5

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

The tool has two parameters with 0% schema description coverage, and the description does not explain scene_id or project_id. Mentioning 'a scene' only echoes the name scene_id and leaves project_id and the relationship between the two identifiers entirely undocumented.

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 clear verb and resource: render a single still frame. 'Fast single-still preview' and '(last frame)' make it more specific than a generic render call and hint at a difference from render_scene, though it does not explicitly name that sibling.

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

Usage Guidelines3/5

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

The words 'preview' and 'fast' imply using this for quick inspection rather than final output, but the description does not say when to use it instead of render_scene. It gives only implied usage guidance with no explicit alternatives 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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