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

Annotations already declare readOnlyHint=false, openWorldHint=true, and destructiveHint=false. The description adds context by stating it is an educational resource (a tool · education) and notes a cost of 4 MESH/call, which gives agents a sense of interaction cost. However, it does not describe what actually happens when called (e.g., returns a guide, no side effects) or how the input payload is used. With annotations present, the description provides marginal extra value but not rich behavioral disclosure.

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?

The description is a single paragraph but well-structured: it starts with the core identity, then lists covered topics, then the target audience, and finally cost/category. Each clause contributes useful information. It is slightly long-winded but not bloated. The front-loaded purpose makes it easy to scan.

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?

Given the tool is a guide with a single 'input' object parameter, the description should explain what to pass. It only says it covers certain topics but never specifies the expected payload format for this tool. The schema description is misleading because it references other tools' payloads, and no output schema exists. An agent cannot confidently invoke this tool correctly, so the description is incomplete.

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?

Although schema description coverage is 100%, the schema's parameter description is generic and gives examples for other tools (agent-brain, agent-memory) rather than for browser-agent-101. The tool description does not clarify what should go into the 'input' object for this specific tool. This leaves the agent without a clear understanding of how to construct a valid invocation, so the description fails to add meaningful parameter semantics.

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 identifies the tool as a 'Plain-language guide to using an AI browser agent' and enumerates the specific coverage areas (agent-to-person work, agent-to-agent work, getting started). This fully distinguishes it from sibling tools like agent-brain or search, which are action-oriented tools rather than educational guides. The name and title are consistent and reinforced by the description, leaving no ambiguity about the tool's purpose.

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?

The description indicates the tool is 'Perfect for anyone new to agentic tools,' which implies a target audience and when it might be most useful. However, it does not explicitly state when not to use it or name alternative tools for specific tasks. The guidance is inferred from the content ('how to get started from zero') rather than explicit, so it meets the 'implied usage' level but lacks clear exclusions.

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