mouseUp

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

No annotations are provided, so the description carries the full burden and provides almost nothing: no mention of required prior state (a held button), effect on drag operations, or error behavior if no button was pressed. Only the minimal action is stated.

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?

Three words, front-loaded with the verb, zero waste. Appropriately sized for a trivial UI primitive, though it is arguably too terse to be self-sufficient.

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 one-parameter input primitive with no output schema, the description covers the core action but omits the operant context — pairing with mouseDown, drag semantics, and whether coordinates or focus matter. Adequate but with clear gaps.

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?

Schema coverage is 100% and the single 'button' parameter is documented with an enum and default, so the schema does the work. The description adds no format or semantic detail beyond what the schema already conveys; baseline 3 applies.

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?

States a specific verb+resource ('Release mouse button') that unambiguously identifies the action. It is clearly distinguishable from most siblings, though it does not explicitly name its counterpart mouseDown or clarify the pair relationship.

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?

No guidance on when to use this versus mouseDown, mouseClick, or click. The key context — that this typically pairs with a preceding mouseDown, e.g. for drag operations — is absent.

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