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

Annotations already declare read-only, idempotent, and non-destructive hints. The description adds context about it being a 'full working router' and its beta nature, but does not describe actual expected behavior or side effects. It does not contradict the 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?

The description is verbose and repetitive, restating 'matches ask_pipeworx exactly' and including meta-information about testing status, retirement dates, and merge decisions. It could be reduced to a single sentence without losing relevant content.

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?

With no output schema, the description should clarify what the tool returns, but it only calls it a 'router' and mentions 'newest routing' without defining the result. It also fails to differentiate this tool from the sibling tools ask_pipeworx and ask_pipeworx_grounded, leaving the agent without sufficient context.

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 complete for all six parameters, with aliases and a clear description for 'question'. The description itself adds no additional semantic detail beyond what the schema already provides, so the baseline of 3 applies.

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 focuses on the tool's beta status and its relationship to ask_pipeworx rather than its actual function. The phrase 'identical universal router' is vague and does not clarify what routing means or what the tool does with the question. It leaves the agent without a clear statement of 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 only usage hint is 'Use it exactly like ask_pipeworx when you want the newest routing,' but 'newest routing' is undefined and no distinction is made from ask_pipeworx or ask_pipeworx_grounded. The rest of the description is about internal testing and comparisons, not actionable use cases.

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