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

Annotations already declare destructiveHint=true and readOnlyHint=false, so the agent knows this is a mutating operation. 'Replace' reinforces that prior clipboard contents are overwritten, but the description adds no permission requirements, no device/session routing behavior, and no note that existing clipboard data is unrecoverable.

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?

A single front-loaded sentence with zero waste. It is efficient, though arguably under-specified for a tool with device and session dimensions rather than deliberately tight.

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 destructive, multi-device, session-scoped write tool with no output schema, one bare sentence leaves key context unstated: it never explains that clipboard contents are lost, how deviceId/workSessionId affect targeting, or what happens on failure. The schema covers parameters, but the behavioral context is thin.

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 67%, and the two optional parameters already carry useful guidance (deviceId references list_devices; workSessionId references create_work_session and instructs passing the same ID every call). The description contributes nothing beyond the schema, so the baseline 3 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?

States a specific verb and resource ('Replace the computer's clipboard text'), which an agent can immediately distinguish from read_clipboard. It does not, however, explicitly name the sibling or scope (which device/which session) it operates over.

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?

There is no when-to-use guidance, no mention of the inverse read_clipboard tool, and no note about multi-device or work-session contexts. The agent must infer usage entirely from the name.

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