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

Annotations already cover safety (readOnlyHint=true, idempotentHint=true, destructiveHint=false, openWorldHint=true), lowering the bar. The description adds genuinely useful behavioral context beyond annotations: candidate routing improvements may be enabled live at any time, none is active as of a dated outcome, and it 'falls back to nothing — this IS a full working router'. This temporal variability and experimental-edge framing is valuable and 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?

Four dense sentences, each earning its place: identity, current state (with date), usage instruction, and correction of a likely misperception that it is a fallback stub. Front-loaded with the most important fact (beta of ask_pipeworx), and the logical flow from definition to state to usage to caveat is clean.

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 semantically simple tool (one required string) with rich annotations, the description is near-complete: it covers identity, current operational state, how to use it, and response shape ('same response shape' compensates for the absent output schema). Minor gaps remain: it relies on the agent knowing ask_pipeworx for details, and it does not clarify its relationship to ask_pipeworx_grounded or what a candidate outcome would look like in results.

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 100%, so the schema already documents all six parameters and the alias relationships. The description adds only the confirmation that arguments are 'same' as ask_pipeworx, which weakly reinforces the alias semantics but does not compensate for or add meaning beyond the already-complete schema. Baseline 3 is appropriate.

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 verb-resource pair ('Beta version of ask_pipeworx') and immediately distinguishes it from siblings by specifying it is 'identical universal router (same 5,908 tools, same arguments, same response shape)'. It clearly separates this experimental edge from the stable ask_pipeworx and the grounded variant in the sibling list, so an agent can tell them apart.

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 an explicit when-to-use condition: 'Use it exactly like ask_pipeworx when you want the newest routing.' It also explains the experimental purpose (results compared against the stable router). It stops short of giving explicit when-not-to-use guidance relative to ask_pipeworx or ask_pipeworx_grounded, but the beta/stable contrast is sufficient context for routing decisions.

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