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

With no annotations, the description carries the behavioral transparency burden. It states the core behavior (list all, filter by category) but omits details such as pagination, permissions, or whether results are summaries or full objects. Acceptable but with gaps.

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?

One concise sentence (12 words) that front-loads the action and includes the key optional behavior. No wasted 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?

For a simple list tool with one optional parameter, the description covers the main purpose and parameter semantics. It omits return value details, but the absence of an output schema makes this less critical. Complete enough for a low-complexity 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 defines 'category' only as a string with no description. The description adds meaning by explaining it as an optional filter, significantly enhancing the agent's understanding beyond the bare schema.

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?

Clearly states 'List all agents in the AgentsKit registry' – a specific verb and resource. Differentiates from siblings like get_agent (fetches single) and search_agents (targeted search) by explicitly indicating it lists all.

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 clear usage context: use to list all agents, optionally filtered by category. However, does not explicitly mention when to prefer it over search_agents or get_agent, though the purpose itself implies the distinction.

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