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

Annotations declare destructiveHint=true and idempotentHint=false, so the description should explain what gets affected and what repeated calls do. Instead it calls the action "tiny" and a "card they tap in Hem" without saying what tapping triggers, whether repeated plings stack or notify repeatedly, or why anything is considered destructive — the framing softens the annotated risk rather than clarifying it.

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?

Very short and the example leads, so the agent immediately sees shape and intent. The nested quotes and Swedish parenthetical are slightly noisy, but nothing is redundant enough to warrant cutting.

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 non-idempotent, destructive-flagged mutation with no output schema, the description leaves the important questions open: who receives it, whether the nudge is a notification or a stored card, whether it can be undone or retracted, and what the caller gets back. The playful framing is not sufficient context for an agent to invoke this safely.

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 50%: "what" is documented as 2–5 words, but "to" has no schema description. The description partly compensates by showing "Pling Sara" (recipient as a name/handle) and "plugga ihop?" (an example payload for "what"), but it never states the expected identifier format for "to" or what happens if the recipient is ambiguous or not a friend.

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?

"A tiny nudge to a friend ... in their chat" states a concrete verb and target, and the example "Pling Sara" plus "a card they tap in Hem" shows the delivery surface. It is clearly distinct from message_member or start_thread, though it never names those siblings to sharpen the boundary.

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?

"Only when the person asks for it" gives one real usage constraint (consent-gated nudging), which is better than nothing. But it offers no routing guidance versus alternatives like message_member or knock, and no frequency or context guidance for when a plain message is the right choice instead.

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