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

With no annotations supplied, the description carries the full burden, and it discloses that the call is argument-free, "costs nothing", returns live coverage rather than a static doc, and includes rules for interpreting any reply. It does not describe the shape of the returned payload (section names, ordering), which is the main remaining gap for a zero-annotation tool.

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?

It is front-loaded with "Start here" and every listed element (tool routing, rules, keyless access, coverage) adds real information. The middle section is an em-dash run-on and the phrase "the two rules" refers to something the reader cannot yet resolve, costing some clarity.

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?

No output schema exists, yet the description tells the agent what the response contains (tool mapping, reading rules, coverage) and its cost. For a low-complexity, zero-parameter entry-point tool this is nearly complete; only the exact structure of the returned sections is left 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; the description simply confirms "Takes no arguments", which is consistent with the empty schema. No further parameter meaning is needed or possible.

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 concretely what the tool returns: a tool-to-question map (naming find_analogs, get_topic_outcomes, query_history, get_market_state, get_price_paths), the rules for reading replies, live coverage data, and what can be asked without a key. That routing content also differentiates it from every listed sibling, so an agent can tell this is the orientation entry point rather than an analytics call.

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?

"Start here" plus "one call is enough to begin" gives an explicit call-first instruction, and "carries the live coverage that list_coverage returns" implicitly tells the agent not to also call that sibling for the same data. It never states a case where this tool should be skipped, but the routing list functions as a clear handoff guide to the alternatives.

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