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

No annotations are provided, so the description carries the behavioral disclosure burden. It explains the KEYCODE_PASTE injection being 'built into the device control protocol,' discloses that empty string clears clipboard, and implies a state-modifying operation. Good disclosure of side effects without 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?

Three concise sentences, each earning its place: the primary purpose, the paste injection detail, and the empty-string clearing edge case. No fluff or redundant restatement of parameter names.

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 straightforward clipboard-set tool with 3 simple params and full schema coverage, the description covers the essential behavioral nuances (paste injection, clear semantics). It doesn't mention return values, but with no output schema and a fire-and-forget device control operation, that's acceptable. Missing only minor details about return confirmation.

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 description coverage is 100%, so the schema documents all 3 parameters (udid, content, paste). The description adds context by connecting the paste parameter to the KEYCODE_PASTE behavior and clarifying empty string semantics, complementing rather than redundantly restating the schema.

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?

Specific verb+resource: 'Set the Android device clipboard via the device control channel.' It clearly states what it does, including the paste injection behavior and empty-string clearing. Distinguishable from siblings like device_clipboard_get and ios_clipboard_set_hid.

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 explains the paste:true behavior and explicitly notes that no separate Ctrl+V is needed, which guides correct usage. It doesn't enumerate exclusions or when-not-to-use scenarios, but provides clear context for the main usage pathway.

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