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

With no annotations, the description carries the full burden, and it does disclose genuinely non-obvious semantics: trapdoor is a stored alert-time score rather than a live rescore, eligible is a saved window flag, and _pro_eligible/_pro_reason are evaluated against today's rules rather than stop history. It still omits operational traits such as empty-result behavior or any auth/permission notes, but the semantic caveats are valuable.

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 purpose is front-loaded in the first clause, followed by field caveats and then the routing instruction; every sentence adds distinct information. It is somewhat dense with underscored field names, but nothing is padding.

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?

An output schema exists, so return values need not be explained, yet the description goes further and clarifies the trickiest stored-vs-live distinctions. For a zero-parameter read tool this is close to complete; only the empty/no-alert case and any staleness horizon are unstated.

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?

The tool takes zero parameters, so the baseline is 4 and there is nothing for the description to compensate for. The field-level explanations it does provide (trapdoor, eligible, _pro_eligible/_pro_reason) add meaning beyond an empty argument 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 identifies the resource precisely as the 'Latest Discord-filtered A+/B card', which tells an agent this returns the most recent qualifying alert rather than history or a recomputed score. It is terse and leans on domain jargon ('A+/B card'), but the scope and freshness distinction from siblings like list_alert_history is inferable.

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 an explicit forward-routing instruction: 'Use check_alert_tradeable before planning', which is a concrete when-to-go-next rule. It stops short of naming when this tool should not be used (e.g. wanting history vs. latest), so it is clear context without explicit exclusions.

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