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

Annotations already declare destructiveHint=true and readOnlyHint=false, but the description 'mark done' sounds benign and does not disclose irreversibility, whether acked events are retrievable, or whether repeated acks are safe (relevant given the idem.* siblings). For a destructive mutation it adds essentially no context beyond the 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?

Extremely short and front-loaded with no wasted words, but at four words the brevity reflects under-specification rather than efficiency. There is room for another clause on effects or preconditions without bloat.

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, two-parameter mutation with no output schema and no parameter documentation, the description leaves out the effect on acked events, the batch size limit, and error/partial-failure behavior. An agent could call it, but not confidently.

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 0% with two required parameters (inbox_id, event_ids) and a maxItems=50 cap. The description says nothing about the parameters — the plural 'events' hints at event_ids but neither the batch limit nor the inbox identifier is explained anywhere.

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 verb+resource pair ('mark inbox events done') is specific enough to identify the operation as acknowledging events in an inbox, which distinguishes it from siblings like inbox.poll and inbox.wait. However, 'done' is ambiguous — it doesn't say whether events are removed, moved to an archive, or merely flagged, which matters for how an agent interprets the effect.

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 guidance on when to ack versus poll, wait, or create, and no preconditions are stated. An agent must infer the workflow position of this tool entirely from the name and sibling list.

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