Render animation sequences in Blender by defining the output path, frame range, and render engine.
Render an animation sequence.
Args: output_path: Output directory path. frame_start: First frame. frame_end: Last frame. engine: Render engine.
| Name | Required | Description | Default |
|---|---|---|---|
| engine | No | CYCLES | |
| frame_end | No | ||
| frame_start | No | ||
| output_path | No |
Changes observed during successful MCP inspections.
v3.0.0Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
No annotations are provided, so the description carries the full burden of behavioral disclosure. It does not mention side effects (e.g., writing files to output_path), whether the operation is blocking, any required scene state, or how empty defaults are handled. This is a critical gap for a tool that likely triggers a long render operation.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Is the description appropriately sized, front-loaded, and free of redundancy?
The description is terse and avoids fluff, which is good. However, it is formatted as an 'Args' list that repeats parameter names already in the schema, and it front-loads the purpose sentence but doesn't expand on it. It is acceptable in length but lacks structural enrichment like examples or context.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
For a tool with 4 parameters, no output schema, and no annotations, the description is severely incomplete. It fails to explain what the output looks like, whether it saves to disk, what happens if output_path is empty, or what render engine options exist. An agent cannot confidently invoke this tool correctly without additional knowledge.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
The input schema provides only titles and defaults with no descriptions (0% coverage), so the description is the sole source of parameter meaning. It gives a one-line gloss for each parameter (e.g., 'output_path: Output directory path'), which adds basic value over the bare schema. However, it omits critical details like acceptable engine values (CYCLES vs EEVEE) and semantics of empty strings, so it only partially compensates for the missing schema descriptions.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Does the description clearly state what the tool does and how it differs from similar tools?
The description states a clear verb and resource: 'Render an animation sequence.' This differentiates from siblings like render_image or render_preview by specifying 'animation sequence,' but it doesn't explicitly name alternatives or contrast them. It is sufficiently clear for an agent to understand the primary action, though sibling differentiation is implicit rather than explicit.
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
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 alternatives like render_image or create_turntable_animation. No prerequisites are mentioned (e.g., animation range set, active scene), and no exclusions are stated. The agent must infer usage from the name alone, which is insufficient.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.