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

Beyond the annotations it discloses two non-obvious traits: SKU quantities are validated against a live catalog (so bad items fail rather than pass through), and the return artifact is a URL the client must click themselves. One tension is left unexplained: readOnlyHint=false implies a non-read-only operation, while the description frames the tool as pure link construction with no state change.

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 compact sentences: what it builds, what inputs it accepts, and what it does not do. The most decision-relevant constraint (returns a link, does not transact) is placed last for emphasis with zero filler.

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 correctly covers the return value ('zwraca link') and who uses it. Minor gaps remain: no mention of link expiry, of what an invalid SKU produces, or of precedence when both items and zestaw/moc/forma are supplied.

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% and all four enums are already documented in the schema, so the schema does the heavy lifting. The description adds framing that zestaw, moc and forma are optional preferences layered on top of the required goal, but nothing about the SKU:quantity format or what happens when validation rejects an item beyond what the schema already states.

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 concrete verb+resource: builds a link to the subscription configurator at /subskrypcja/zestaw. It explicitly declares the negative scope ('NIE tworzy subskrypcji ani nie płaci'), which separates it from compose_subscription, zloz_zamowienie and place_order without the agent opening any schema.

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 makes clear this is the path when the outcome is a hand-off link for the client to click, and it explicitly rules out actual subscription creation or payment. It stops short of naming a specific sibling to use instead when the agent does need to create a subscription or order, leaving that routing to inference.

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