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

With no annotations, the description carries the full burden and does well: it discloses the return units (psig), that two values (bubble and dew) are returned, that they coincide for pure fluids, and that certification is a prerequisite. It omits error behavior for unrecognized refrigerants and any valid temperature/refrigerant ranges.

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 core purpose, then example, then the operational bubble/dew guidance. Every sentence carries information, though the certification note sits between the example and the usage rules, slightly interrupting the flow of the most actionable content.

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?

No output schema exists, and the description adequately covers the return shape (psig, bubble and dew) and the special pure-fluid case. For a 2-parameter domain lookup this is nearly sufficient; the remaining gap is naming/range validation, which matters little since there is no error-handling context to convey.

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% (only bare titles), so the description must compensate: it specifies temp_f is in Fahrenheit and demonstrates the argument order and refrigerant string format via pt_lookup("R-454B", 45). It still does not state valid refrigerant naming conventions or a supported list, which leaves ambiguity for the agent.

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 (lookup) and resource (saturation pressure, bubble and dew, in psig) with explicit input units (Fahrenheit) plus a concrete call example. An agent immediately understands this is a PT chart lookup returning two pressure values, and the companion tool pt_reverse is implicitly the inverse operation.

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?

Gives real conditional guidance: bubble point for subcooling calculations, dew point for superheat calculations, and notes pure fluids show no glide so both values match. It also states the prerequisite audience (EPA 608 / A2L certified technicians). It does not explicitly name alternatives such as pt_reverse or the subcooling/superheat tools as the downstream consumers.

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