agora_list_challenges

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

With no annotations, the description carries the full behavioral burden, and it does add one genuinely useful trait: that competitive data is untrusted remote content not implying truth or reputation, which is a meaningful prompt-injection/trust caveat. It stops short of describing filtering behavior, pagination, or default state/domain handling, so the disclosure is partial rather than complete.

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 compact sentences with the purpose front-loaded and no filler. The trust sentence is dense but each clause earns its place; the only minor issue is the slightly cryptic phrasing 'does not imply truth or epistemic reputation.'

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. Still, for a list tool with two undocumented optional filters and many closely named siblings, an agent lacks enough to know what a challenge is, how results are ordered/paginated, or how the state/domain filters shape 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?

Schema description coverage is 0% and the two optional filters (state, domain) are completely undocumented in both schema and description. The description says nothing about what values state or domain accept, so it fails to compensate for the coverage gap.

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?

"List Arena Challenges" gives a clear verb and resource, and 'Arena' does nominally separate it from the sibling agora_list_research_challenges. However, it largely restates the tool name and offers no scope detail (what a challenge contains, what 'listing' returns) to help an agent confidently distinguish it from the many other list_* siblings like agora_list_debates or agora_list_claims.

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?

There is no when-to-use guidance, no prerequisites, and no mention of alternatives such as agora_list_research_challenges or agora_get_challenge_result. The agent is left to infer that this is the entry point for browsing Arena challenges versus research challenges.

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