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

With no annotations, the description carries the full burden. It usefully discloses a quota (3 free calls/day) and an entitlement gate ('ledger'), which is real behavioral context an agent should know before invoking. It says nothing about side effects, idempotency, latency, or whether the routing is purely advisory, so disclosure is partial.

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?

Two short sentences with no filler; the product/entitlement tag is front-loaded and the core action follows. Nothing is redundant, though the bracketed metadata prefix adds minor noise before the actual purpose statement.

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 one-parameter tool with no output schema and no annotations, the description should at minimum describe what a successful call returns. It says the result is a 'capability/pipeline coordinate' but never explains the shape or how to use that coordinate, leaving a meaningful gap.

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?

Only one parameter, fully documented in the schema (100% coverage: 'The natural-language intent to route'). The description adds no syntax, format, or example beyond what the schema already states, so 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?

States a specific verb and resource: 'Route a natural-language intent to a deterministic capability/pipeline coordinate.' An agent understands this is intent-to-route resolution, not text processing. However, it does not distinguish itself from plausible siblings like agents_intent_classify or inference, so the agent must guess which routing tool is canonical.

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?

No when-to-use, when-not-to-use, or alternative is named. The only usage constraint given is a quota ('3 free calls/day, then entitlement ledger'), which is a rate/pricing limit rather than guidance on selecting this tool over its many siblings.

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