property_epc

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

No annotations provided, so description carries full burden. Describes return values for both modes (energy rating, score, floor area, etc.) but does not explicitly state it is a read-only query or mention any potential side effects, rate limits, or authentication. Implicitly safe but not fully transparent.

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?

Three sentences: first states general purpose, then two bullet-like sentences for each mode. No wasted words, front-loaded with core function. Excellent structure for quick scanning.

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?

Given the tool's two-mode complexity and lack of output schema, the description covers both modes and specifies returned fields for each. Could mention expected output structure or error cases, but is largely sufficient for an agent to decide.

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%, but the description adds significant value: explains the behavioral difference when address is provided vs omitted, and lists the output fields for both cases. Provides context beyond the schema's parameter descriptions.

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?

Clearly states it retrieves EPC certificate data for UK property or postcode area, with two distinct modes: with address returns specific certificate details, without address returns area-level aggregation. Distinguishes from sibling tools by specifying its exact resource and behavior.

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?

Provides explicit guidance on when to use each mode: 'Use this for area analysis rather than a single-property lookup.' Clearly indicates that omitting the address gives area aggregation. Does not explicitly exclude sibling tools but context is sufficient.

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