get_checkout_url

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

Annotations indicate idempotentHint=true and readOnlyHint=false, meaning the tool is safe to retry and not read-only. The description adds context about post-payment email and activation, but does not disclose whether repeated calls create multiple checkout sessions, or if the URL expires. It also doesn't detail error cases or side effects beyond the stated flow.

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 front-loads the main purpose but is somewhat verbose, repeating tier details already in the schema. It is structured logically (purpose, flow, tiers, instruction) but could be more concise without losing clarity.

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?

Although there is no output schema, the description only says 'Returns a URL' without specifying the exact format or example. It also omits immediate return behavior (is it a redirect URL?), error conditions, and what happens if the email is invalid. The post-payment flow is detailed, but the tool's immediate output is underspecified.

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?

All three parameters are described in the schema (100% coverage), so baseline is 3. The description adds significant value by explaining the tier options with pricing and details, and the referral code purpose, which are not fully captured in the schema descriptions. This makes the parameter meaning clearer and more actionable.

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 clearly states the tool generates a Stripe checkout URL for an AlgoChains subscription, with a specific verb ('Generate') and resource. It distinguishes the action from siblings like get_started or generate_payment_link by detailing the subscription flow and tier options, though it doesn't explicitly contrast with alternatives.

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 lacks guidance on when to use this tool versus sibling tools like generate_payment_link or get_started. It explains the tiers but does not specify prerequisites, alternative tools, or scenarios where this tool is inappropriate (e.g., existing subscriptions).

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