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

Annotations already declare readOnlyHint=true, idempotentHint=true, destructiveHint=false, so safety is covered structurally; the description adds the useful behavioral fact that this is a comparison against the latest published chart version and is a precursor to a move/update step. It does not describe what the check returns (e.g. drift status, version identifiers), which is left implicit.

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 tight lines: purpose first, then trigger, then next-step routing, with a compact example. No filler, and the most important information is front-loaded.

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 single-parameter read-only check, the description covers purpose, timing, and follow-up actions well. The one remaining gap is the return shape — with no output schema, the agent is not told what a 'fresh' vs 'stale' result looks like — but this is a minor omission for a diagnostic tool.

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 parameter is documented as 'Key from list_chart_events', so the schema already carries the semantics (baseline 3). The description goes slightly beyond by supplying a concrete worked example ({"eventKey": "ev_1350a828b5ff"}), which usefully confirms the expected key format.

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 ('Check whether an event uses an older published chart version') and explicitly frames the outcome ('could move to the latest'). This is clearly distinguishable from siblings like update_event_chart and move_event_to_chart, which the description names separately.

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?

Gives an explicit trigger ('Use when: after publishing chart changes') and routes to the correct next tool conditioned on lifecycle state ('on sale' -> plan_inventory_change / move_event_to_chart; 'in setup' -> update_event_chart). This is the when-to-use plus alternatives pattern at its best.

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