get_latest

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

With no annotations, the description fully discloses the paid nature ($0.01 via x402), the payment mechanism (USDC on Base), and the compute-first/settle-after model where users are never charged for an error. It also reveals the response without a key (402 price terms), providing complete transparency about tool behavior.

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 information-dense and front-loaded with the cost, but it contains a minor redundancy: 'PAID $0.01 via x402' and 'Pays USDC on Base via x402' both state the x402 payment. Otherwise, every sentence provides unique value and the structure is logical.

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?

Given the tool's simplicity (no params, no output schema), the description covers everything an agent needs: purpose, cost, usage sequence, prerequisites, and how to discover the response shape via get_sample. It is fully self-contained with appropriate cross-references to sibling tools.

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 input schema has zero parameters, so a baseline score of 4 applies. The description adds no parameter-specific semantics because there are none to describe, and it appropriately focuses on behavioral and usage context instead.

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 clearly states that get_latest returns the most recent Polymarket feed item and enumerates the types of items (quality-gated mover, tracked-whale entry, AI-detected predetermined-outcome signal). It distinguishes itself from get_signal by saying 'Same shape as get_signal without an index', making the purpose specific and unambiguous.

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 explicit usage instructions: 'Poll get_index (free) first; preview the shape with get_sample (free)' and provides the prerequisite of setting PRIVATE_KEY for live API use, noting the behavior without a key. This clearly guides when and how to use this tool versus alternatives.

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