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

There are no annotations, so the description bears the full burden of explaining behavior. It hints that the tool returns options and can filter by a tag value, but it never explicitly states that this is a read-only retrieval operation, what the output shape is, or whether any side effects occur. For a tool with no annotation context, this is insufficient disclosure.

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 short, but its structure is poor due to repeated 'The The', missing words, and awkward phrasing. It is not cleanly front-loaded with a clear action or object. A concise description still needs to be grammatical and immediately understandable, which this is not.

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 tool with only two parameters and no output schema, the description still leaves major gaps: it does not clearly state what the returned comparison options look like, how filterKey and filterValue work together, or how this tool differs from its siblings. The available information is too incomplete for a new agent to invoke it confidently.

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 0%, so the description must explain the two parameters, filterKey and filterValue. The phrase 'optionally filtered by a tag value' gives some meaning to filterValue, but filterKey is not explained, and the relationship between the two parameters is left ambiguous. This is only partial parameter documentation.

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 indicates that the tool provides comparison options with fields such as name, suitability, and tags, and supports optional tag filtering. However, the phrasing 'The options in the The covers a UK self build needs comparison' is garbled and unclear, and it does not explicitly state a verb like 'list' or 'get'. It is more informative than a tautology, but too malformed to fully clarify the tool's purpose.

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 gives no guidance on when to use compare_options rather than sibling tools like compare_criteria, compare_table, or the enquiry tools. It only mentions an optional filter, which is a parameter detail, not usage context. An agent would have to infer the appropriate tool selection from the name alone.

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