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

With annotations only covering the mutation/safety profile (readOnlyHint=false, destructiveHint=false, idempotentHint=false), the description adds substantial behavior: the alert fires immediately on crossing, is marked already_true, is one-shot unless repeat for at most hourly firing, polling cadence of 10 minutes, stale data suppression, and API-key/auth requirement. It also clarifies the tool places no orders and moves no funds, which is valuable scoping 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?

The critical trigger condition is front-loaded in the first sentence, followed by kind/threshold semantics and then firing rules. Most sentences earn their place, though promotional/boilerplate content (the EventTrader dashboard URL, the plausibility-check and 'not financial advice' lines) dilutes focus slightly.

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 create tool with no output schema, it covers firing semantics, repeat limits, cadence, and auth requirements well. It does not describe what is returned on success (e.g. an alert id or confirmation), which is the one gap an agent would want filled.

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 the baseline is 3, but the description genuinely extends meaning: it explains that threshold units depend on kind (dollars, percent, or the meter's scale), points kind at the crypto_alert_kinds sibling, and constrains repeat to at most once an hour. It adds real semantics beyond the terse schema strings.

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 states a specific verb and resource: creating an alert that fires when a coin crosses a threshold. It is unambiguous about what gets created (an alert delivered to the agent) and the trigger condition. It does not explicitly name or contrast with siblings like crypto_alerts_list or crypto_alert_delete, so it stops short of a 5.

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?

It gives clear operational context: needs a registered agent (API key), checked every 10 minutes, one-shot unless repeat=true, and stale data fires nothing. It routes the agent to the sibling crypto_alert_kinds for valid kind values. It does not explicitly say when to prefer this over other alerting tools or state exclusions.

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