call_service_tool

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

The description explains the return value and provides examples, but does not disclose potential side effects (e.g., destructive mutations), authentication needs, or error handling. Given no annotations, more transparency about the generic nature and risks would improve score.

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 well-structured with separate sections for description, args, returns, and examples. It is moderately concise; the examples are useful and not overly verbose.

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?

The description provides a good overview of purpose, parameters, return value, and examples. For a tool that calls arbitrary services, it covers the necessary context without requiring additional information from output schema or annotations.

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?

With 0% schema description coverage, the description compensates well by explaining each parameter (domain, service, data) and giving concrete examples. It adds meaning beyond the schema's title-only definitions.

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 clearly states 'Call any Home Assistant service (low-level API access)' with specific verb and resource. It distinguishes from sibling tools like get_entity or list_entities which are higher-level or more specific operations.

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?

The description implies usage as a low-level access for arbitrary service calls, but does not explicitly state when to use this tool versus alternatives. No exclusions or when-not-to-use guidance is provided.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.