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

Annotations already declare readOnlyHint, idempotentHint, openWorldHint and destructiveHint=false, so the safety profile is covered. The description adds genuinely non-obvious behavior beyond that: a per-call cost of 0.01 USDC via Base x402 and the X-Provider-Key header for customer-owned credentials — both are things an agent could not infer from the schema or annotations.

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 sentences, front-loaded with the core capability and followed by the cost/auth caveat. No filler, no restatement of the tool name.

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 three-parameter, read-only computation tool with no output schema, the description conveys what is produced (ISO dates plus episode numbering) and the transaction cost. The remaining gap is the exact return structure and whether episode numbering is 1-based, which the schema placeholders purport to defer to a description that never supplies them.

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 nominally 100%, so the baseline is 3, but the schema's own parameter descriptions are placeholders ('see operation description for units and format') that delegate back to the description. The description partly fills that gap by implying cadence (interval_days), count (episodes) and anchor point (first_date), but it never states units or format explicitly as the schema promises it would.

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 states a specific verb and output ('Generate ISO dates') tied to a concrete domain concept ('serial drama production release cadence and episode numbering'), which is far more specific than the tool name alone. It does not, however, distinguish itself from adjacent siblings such as api_series_watch_plan or api_film_production_budget, so the agent must infer the boundary.

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?

There is no statement of when to use this tool versus alternatives, no prerequisites, and no exclusions. The second sentence covers payment and credential mechanics, which is operational rather than usage guidance.

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