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

Annotations already declare readOnlyHint, idempotentHint, openWorldHint and non-destructiveness, so the safety profile is fully covered. The description adds one behavioral detail, that duplicate listings of the same event are collapsed by default, though this largely restates the collapse_duplicates schema default. It does not disclose any result-format, result-count, or throttling 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?

Three sentences, front-loaded with the core capability and ending with the sibling hand-off, which is efficiently structured. The duplicate-collapsing sentence slightly overlaps the schema default and could be trimmed, but nothing is wasted.

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 13-parameter search tool with no output schema and only 38% schema description coverage, the description is adequate but incomplete: it never sketches what a result contains or how many are returned, and several parameters lack any explanation. It covers the main filter surface without fully rounding out the tool.

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 38% across 13 parameters. The description usefully maps natural-language filters (keyword, type, category, format, prize, closes soon, recently posted/updated) onto the matching parameters, but leaves sort, limit, free_only, include_closed and collapse_duplicates semantics unexplained, so it does not 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?

States a specific verb (Search and filter) plus resource (HackList's AI & Web3 hackathons, grants, bounties, programs), and enumerates the filter axes. An agent can distinguish this from siblings like best_opportunities or closing_soon, since it is clearly the general filtered-search entry point.

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?

Explicitly routes the agent to get_opportunity for the full brief and eligibility details of a returned result, which is clear when-to-use guidance. However, it gives no guidance on when to prefer this over search, best_opportunities, closing_soon, or whats_new, so the sibling routing is only partially covered.

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