Get Active Layer

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

The description correctly indicates a read operation, consistent with the 'readOnlyHint' annotation. However, it adds little beyond that; the annotation already signals no side effects. The description does not elaborate on return format or other behavioral traits.

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 a concise single sentence that immediately conveys the tool's purpose. No extraneous information.

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 parameterless tool with a clear read-only annotation and an output schema, the description provides sufficient context. The existence of the output schema compensates for any missing details about return values.

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 has no parameters, so the description does not need to explain parameter semantics. The baseline for zero parameters is 4, which is appropriate.

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 the tool retrieves the currently active layer from the QGIS layer panel. It uses a specific verb-resource combination and is easily distinguished from the sibling tool 'set_active_layer'.

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 the tool should be used to query the active layer, but it does not explicitly state when not to use it or mention alternatives. Given the sibling 'set_active_layer', the context is clear enough for an agent.

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