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

The annotations already declare readOnlyHint, idempotentHint, openWorldHint and destructiveHint=false, so the safety profile is fully covered without the description. The description's real additions are data-freshness and cost: results are 'delayed on lower plans' and each call is billed at 0.3 points, which an agent cannot learn from annotations. It falls short of top marks because 'pass `newest` back' references a parameter that does not exist in the input schema, which is stale or ambiguous documentation rather than useful disclosure.

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?

The description is two compact sentences with the payload summary front-loaded and the operational facts in a parenthetical, so scanning is fast and there is little waste. The 'pass `newest` back' clause is the only phrase that does not earn its place and actively risks confusion.

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 seven-parameter, zero-required list tool with no output schema, the description covers the important return semantics (event list, severity scale, newest-first ordering, plan-based delay) and the billing cost. The main gap is the `types` parameter, which is a free-form comma-separated string with no enum and no hint about valid values anywhere, an agent has no way to discover acceptable event types.

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%, so all seven parameters, including the asset enum and the 1-4 severity bounds, are documented in the schema and a baseline of 3 is appropriate. The description contributes only one ordering nuance ('with since: oldest first'), which is genuinely useful, but it also introduces the undefined `newest` parameter, muddling rather than clarifying 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?

The description names a specific resource and scope: 'Market Pulse events on US stocks and crypto: sudden price moves and other market events, each with a severity from 1 to 4.' An agent knows it is a list-of-events endpoint rather than an aggregate or analysis endpoint, but the description never distinguishes it from close siblings such as get_pulse_summary or get_autopilot_events.

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?

Ordering guidance is present ('Newest first (with since: oldest first...)'), and the pricing hint ('(0.3 points per call)') helps an agent weigh frequency. However, there is no statement of when to choose this over get_pulse_summary, deep_events, or get_sector_events, which are the realistic alternatives, so routing must be inferred.

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