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

Annotations already cover the safety profile (readOnly, idempotent, non-destructive, closed-world), so the bar is lower, and the description adds meaningful context: a paid API key is required and the source's redistribution terms are under review. It does not discuss pagination or result volume, but with an output schema present that gap is minor.

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?

Front-loaded with the data content, then a compact access note. The pricing/refund sentence is commercial rather than functional but is short and does carry the gating information; nothing is padded or redundant.

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?

Output schema exists so return values need not be explained, and the description covers access requirements plus filter dimensions. Missing only peripheral details like expected date/LDA code formats or result-size behavior.

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 0% and the single 'params' property is an untyped free-form object, so the schema conveys essentially nothing. The description compensates by naming the actual filter dimensions (delivery year, LDA), which is the key information an agent needs to construct the filter object.

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?

States a specific verb and resource (query PJM Base Residual Auction UCAP clearing prices, RTO cleared MW, reliability requirement, price collar) and scopes it by delivery year and LDA. An agent can distinguish this from describe_power_capacity_market_pjm_v1 and from the MISO counterpart without opening a schema.

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?

It discloses an access prerequisite (API key, paid tiers, not in the 25 free queries), which is real usage context, but gives no when-to-use/when-not-to-use guidance or comparison to sibling tools such as describe_power_capacity_market_pjm_v1 or query_power_capacity_market_miso_v1. Usage must be inferred from the resource named.

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