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ws_render_template

Render Jinja2 templates via WebSocket to dynamically generate content in Home Assistant automations.

Instructions

Render a Jinja2 template via WebSocket.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
templateYes

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
resultYes
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 full burden of behavioral disclosure. It only states the core function without revealing side effects, permissions needed, error behavior, or whether the template rendering is synchronous or asynchronous. For a tool that may interact with system state, this is insufficient.

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

Conciseness2/5

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

The description is extremely short (one sentence) and front-loaded, but it sacrifices informativeness for brevity. While concise, it fails to add value beyond the tool's name, resulting in under-specification rather than effective conciseness.

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 simplicity (1 param, no nested objects, output schema exists), the description still lacks completeness. It omits any mention of return values, error conditions, or usage examples. The existence of an output schema reduces the burden slightly, but the description remains too minimal to adequately guide an agent.

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 input schema has one parameter ('template') with 0% description coverage. The description does not explain what the template string should contain (e.g., the template syntax, variables available, or any format expectations). The agent receives no added meaning beyond the schema's type 'string'.

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?

The description clearly states the action (render), the resource (Jinja2 template), and the communication method (via WebSocket). This distinguishes it from its sibling 'services_render_template', which presumably renders templates via a service call. The verb+resource+scope is specific and unambiguous.

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 does not provide any guidance on when to use this WebSocket-based tool versus the service-based alternative ('services_render_template'). No contexts, prerequisites, or exclusions are mentioned. The agent is left to infer usage from the name alone.

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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