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

Annotations already declare readOnlyHint=true and destructiveHint=false, so the safety profile is covered. The description adds genuinely non-obvious context: the call costs no credits, which matters in a credit-metered product where other tools presumably do consume balance. It does not state whether the result is a URL or page content, keeping it below a 5.

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, front-loaded with the verb and resource, then the credit-cost fact. Nothing is padded and nothing important is buried.

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 zero-parameter, read-only link/reference tool with no output schema, the description supplies purpose, scope, and cost behavior — close to all an agent needs. The only mild gap is not clarifying whether the return value is a link or rendered page content.

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?

The tool takes zero parameters and the empty schema makes that unambiguous, so there is nothing to disambiguate. Baseline for a no-parameter tool 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 uses a specific verb+resource combination ("Get Promptify's pricing page") and scopes it to credit packs and monthly plans, which tells an agent what it returns. It does not differentiate from the potentially confusable sibling get_credit_balance (current balance vs. plan pricing), so it falls short of a 5.

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?

Usage is implied — reach for this when a user wants to see what things cost — but there is no explicit when-to-use statement, no exclusion of adjacent tools like get_credit_balance, and no prerequisite guidance. Adequate but leaves the routing decision to inference.

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