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

Matches annotations (read-only, idempotent) and adds 'free' and ranking details. Does not contradict annotations.

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?

Very concise (3 lines), front-loads purpose, and well-structured without unnecessary words.

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?

Covers purpose, filtering, ranking, and read-only nature. Has output schema and rich annotations, so missing param explanations for limit and caller_id are minor gaps.

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 coverage is 0%, but description only explains the capability parameter with a list of values. No details on limit or caller_id, insufficient compensation for low coverage.

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 'Find registered agents, optionally filtered to one capability,' with a specific verb and resource. It lists valid capabilities and distinguishes this from sibling tools like discover_strategies.

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?

Provides explicit context on filtering (capability list, empty = all) and ranking (by reputation then recency). Lacks explicit when-not or alternatives but is adequate for agent discovery context.

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