get_polymarket_latest

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

With no annotations provided, the description carries the full burden of behavioral disclosure. It usefully states the rate limit (1 request per 5 minutes), that it is free, and that no API key is required, which covers cost and access constraints. It also lists the output fields. However, it does not explicitly state read-only semantics (though 'Get' implies it) or mention any error conditions, such as what happens if no signal is available. The safety profile is partially covered, but not comprehensive.

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 reasonably concise, with the primary purpose front-loaded in the first sentence. It contains three sentences that each add value: purpose, output fields, and constraints. It could be slightly more streamlined (e.g., merging 'Free, rate limited...' and 'No payment or API key required' into one clause), but overall it is efficient and well-structured without redundant information.

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 zero-parameter tool with no output schema, the description covers the essential aspects: what it does, what it returns (list of fields), and key constraints (rate limit, free, no key). It does not describe error handling or edge cases (e.g., when no signal exists), but this is minor given the simplicity of the tool. Overall, it provides sufficient context for an agent to understand the tool's functionality and expected output.

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 has zero parameters, so the description has no parameter details to add. According to the rubric, a baseline of 4 is appropriate when there are no parameters. The description does not introduce any parameter-related confusion, and no additional explanation is needed.

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 the verb 'Get' and the resource 'most recent Polymarket predetermined outcome signal' with a specific purpose (detecting markets where outcome is known by insiders). It also lists the returned fields, making the purpose unambiguous. However, it does not explicitly differentiate itself from sibling tools like get_polymarket_signal or get_polymarket_signals beyond the 'most recent' qualifier, which is implicit rather than explicit.

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 provides no guidance on when to use this tool versus its siblings. It mentions rate limiting and that it is free, but does not explain selection criteria (e.g., 'use this for the latest signal, use get_polymarket_signal for a specific signal') or any conditions under which this tool should be avoided or preferred. This is a notable gap for an agent deciding between similar Polymarket tools.

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