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

Annotations already set readOnlyHint=true and destructiveHint=false. The description adds that the result includes access and charging metadata, clarifying the nature of the output. It does not contradict annotations, though it does not disclose pagination or exhaustiveness.

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 main sentence is clear and compact. The prefixed 'FREE DISCOVERY.' is somewhat promotional and adds little functional value, but the description remains short and front-loaded.

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 low-complexity read-only list tool, the description conveys the core return content. However, it does not state what the 'access' parameter does, what 'FREE DISCOVERY' means, or what the response shape looks like, leaving some ambiguity for an agent choosing between many list tools.

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 schema's single parameter 'access' has an enum (all/free/paid) that is fairly self-explanatory, but the description provides no explanation of the filter or its default behavior, and schema description coverage is 0%. The mention of 'free and paid capabilities' weakly aligns with the parameter values.

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 the verb 'Lists' with a specific resource 'capabilities' and elaborates that they include free and paid variants with access and charging metadata. This distinguishes it from sibling list tools such as list_offers and list_stripe_offers, though it does not explicitly name them.

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 guidance is provided on when to choose this tool over alternatives. The 'FREE DISCOVERY' tagline hints at a discovery or zero-cost use case but does not state exclusions or compare with siblings like list_offers, discover_provider, or list_stripe_offers.

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