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

With no annotations present, the description carries the full burden and delivers: it explicitly states the operation is a read with no answering side effect, reveals the auth requirement (X-NW-User-Key), and discloses the null return case. This gives the agent a realistic model of what will happen when the tool is called.

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 purpose, and every clause earns its place by describing an output or boundary condition. It is dense but not bloated.

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?

The description enumerates all relevant return values (state, UTC deadline, fallback name, answer call), specifies the no-window case, and includes the auth requirement. With no parameters and no output schema, this fully equips an agent to call the tool correctly.

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?

The tool has zero parameters and the schema confirms this, so there is no parameter information the description needs to add. The baseline of 4 applies because nothing is missing or ambiguous about invocation.

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 names a specific verb ('Read') and resource ('SBT naming window'), and sharpens the scope with 'without answering it.' It also lists the concrete pieces of information returned, making the tool's purpose unmistakable and distinct from any answering action.

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 clearly frames this as the read-only inspection tool and tells the agent it should not answer the window. It also gives a useful boundary condition ('Returns null when no window has ever opened'). It does not explicitly name the sibling tool to use for answering, so it stops short of full alternative routing.

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