qt-mcp

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

With no annotations provided, the description carries full burden for behavioral disclosure. It states what the tool does but doesn't describe what happens during invocation: whether it's synchronous/asynchronous, if it returns values, error conditions, or side effects. For a tool that invokes methods on QObjects, this lack of behavioral context is a significant gap, though it doesn't contradict any annotations.

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 appropriately concise with a clear purpose statement followed by parameter explanations. Every sentence adds value: the first defines the tool's function, and the next two clarify parameter meanings. It's front-loaded with the core functionality. Minor improvement could be adding a brief example or more context about QObject invocation.

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?

Given 2 parameters with 0% schema coverage but good parameter semantics in the description, plus an output schema (which means return values are documented elsewhere), the description is moderately complete. However, for a tool that performs method invocation—a potentially complex operation—the description lacks information about what the invocation does, return types, or error handling, making it incomplete for full understanding.

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 description adds meaningful context for both parameters: 'ref' is explained as 'Widget ref from qt_snapshot', and 'method_name' as 'Slot/method name to invoke'. With 0% schema description coverage, this compensates well by providing practical usage information beyond the bare schema types. However, it doesn't specify format constraints or examples for method names.

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 verb 'invoke' and the resource 'a slot or method on a QObject', making the purpose specific and understandable. It distinguishes from siblings like qt_click or qt_set_property by focusing on method invocation rather than UI interaction or property modification. However, it doesn't explicitly differentiate from qt_trigger_action, which might have overlapping functionality.

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 provides no guidance on when to use this tool versus alternatives. It mentions 'ref: Widget ref from qt_snapshot', implying a prerequisite relationship with qt_snapshot, but doesn't state this explicitly as a requirement or suggest other tools for similar tasks. There's no mention of when-not-to-use scenarios or clear alternatives among the many sibling tools.

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