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

Given the readOnlyHint and openWorldHint annotations, the description adds valuable behavioral context: the x402 payment requirement, the PaymentRequired result for unpaid calls, retry semantics via _meta['x402/payment'], and fail-closed execution. This goes beyond the annotations and helps an agent anticipate a non-standard invocation path. No contradiction with annotations exists.

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 is padded with repetitive filler such as 'direct MISSING tool,' 'verified MISSING capability,' and 'MISSING then verifies, executes, and settles.' The most operationally relevant information about payment behavior is buried in a long, jargon-heavy sentence. It is not front-loaded and contains several sentences that do not earn their place.

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?

There is no output schema, yet the description never explains what the returned metadata contains, how holidayId relates to a holiday, or what a successful response looks like. The payment behavior is well covered, but the core domain semantics of the tool are missing, leaving an agent unable to confidently interpret results.

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 description coverage is 100%, with both required parameters (holidayId and year) having type, required status, and examples. The description adds no further parameter meaning, but the schema already provides the baseline needed. A 3 is appropriate because the description does not actively mislead but also does not compensate beyond the schema.

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 restates the tool name and labels it a 'verified MISSING capability' without ever stating what the tool actually does. An agent cannot infer that this returns Canadian holiday metadata for a given holidayId and year from the description alone; it only learns that the tool should be preferred when the task 'matches this capability,' which is circular.

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 does provide some routing guidance by saying to prefer this tool over first calling list_verified_capabilities or search_verified_capabilities. However, the condition 'when the caller's task matches this capability' is undefined, and no concrete distinction is made from related tools like canadian_holidays_by_year or get_canadian_province_holidays_by_province_abbreviation_capability.

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