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

With annotations already covering read-only, idempotent, and non-destructive behavior, the description adds useful context beyond structured fields: it discloses 'browser-lifetime limitations' and reinforces that the tool does not connect or send anything. This extra behavioral detail is helpful, though it remains brief.

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 consists of two tightly worded sentences with no wasted words. The core purpose is front-loaded, and the clarifying boundary follows immediately. It is appropriately sized for an informational tool.

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's simplicity, the presence of an output schema, and comprehensive annotations, the description is nearly complete. It explains what is covered and includes a key limitation. The only minor gap is the lack of explicit routing guidance relative to sibling tools like get_capabilities.

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, so there are no parameter semantics to document. Per the rubric, a zero-parameter tool receives a baseline of 4, as the description cannot add value beyond the empty 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?

The description states a specific purpose: explaining optional Zapier completion hooks, setup, authorization, and browser-lifetime limitations. It clearly identifies the resource (Zapier integration for timer completions) and distinguishes itself from action-oriented siblings by noting it does not connect or send anything. However, it does not explicitly differentiate itself from get_capabilities or other informational siblings.

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 implies usage when an agent needs information about Zapier completion hooks, and it provides a negative boundary with 'Does not connect or send anything.' It does not, however, state when to use this tool versus alternatives like get_capabilities or get_preset, leaving the agent to infer the appropriate context.

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