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

Annotations already declare readOnlyHint=true, openWorldHint=false, and destructiveHint=false. The description adds meaningful behavioral details beyond that: case-insensitive substring matching, AND-combination of filters, optional filters, and the equivalence to list_howto_pages when called with no arguments. This is useful operational context not present in the 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 with no filler. The primary filtering behavior is stated first, followed by the important AND-combination semantics and the no-argument behavior. Every sentence adds value and the structure is easy to scan.

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 moderate complexity (four optional parameters, zero required), the description is complete: it explains filter combination, optionality, case-insensitivity, and the degenerate no-argument case. The presence of an output schema covers return-value expectations, so no major context is missing.

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%, so every parameter is already documented in the input schema. The description confirms the query behavior (case-insensitive substring against title + analysis name) but does not substantially add meaning beyond the schema, so the baseline score of 3 is appropriate.

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?

Description states a specific verb ('Filter the how-to index') and names the four filtering dimensions: analysis family, tool, vertical, and text query. It clearly distinguishes this from list_howto_pages by noting that no-argument calls return every page, while also framing itself as the filtering entry point.

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 clear usage context: all filters are optional, combine with AND, and the no-argument behavior matches list_howto_pages. It does not explicitly enumerate when NOT to use this tool or direct the agent to a sibling for unfiltered listing, but the 'same as list_howto_pages' note provides a useful comparison.

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