insider_latest

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

With no annotations, the description carries the full burden and does well: it discloses the paid model ($0.01 USDC per call via x402 on Base, auto-charged from the wallet), the freshness window (parsed within minutes of filing), and the return format (clean JSON). It omits error/failure behavior and what happens if the wallet lacks funds, which is notable for a paid endpoint.

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?

Two dense sentences with zero filler: data source and freshness first, then filtering, then cost. Every clause carries information an agent needs before invoking.

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 three-param, no-output-schema read tool, the description covers source, freshness, filters, and payment model — the essentials. It would be complete with a note on sibling differentiation and empty-result or payment-failure behavior.

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 100%, so all three parameters are already documented in the schema, establishing a baseline of 3. The description restates the type codes (P=buy, S=sale) and min_value filter without adding new syntax or format detail beyond 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?

Names a specific verb and resource — most recent SEC Form 4 insider transactions for US stocks — with concrete detail about parsing latency. It does not, however, distinguish itself from the sibling tools insider_ticker and insider_clusters, which an agent must choose between.

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?

The description implies usage by describing filter options ('filter by type... and minimum dollar value'), but never states when to pick this over insider_ticker or insider_clusters. No explicit when/when-not guidance is given.

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