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

Annotations already declare readOnlyHint, destructiveHint=false, and openWorldHint=false, so safety is covered. The description contributes the useful behavioral detail that results are presented as cards with short multi-page content, which signals the return shape and expected payload size. It says nothing about result limits, pagination, or ordering, so the additional context is modest.

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?

A single well-formed sentence leads with the verb and resource, and the filtering note is placed last. The parenthetical examples of mindsets are lengthy but earn their space by grounding an unfamiliar content type; the definition is compact overall.

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?

This is a read-only list tool with two optional parameters, full schema coverage, and annotations covering the safety profile, so little burden remains for the description. The one notable gap, how many journeys are returned and in what order, matters less here because there is no output schema or pagination parameter to explain.

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 100% and both parameters carry their own descriptions, so the schema does the heavy lifting. The description's "filter by mindset or words" merely restates the two schema fields without adding matching behavior, case sensitivity, or combination semantics, so the 3 baseline applies.

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 gives a specific verb+resource ("List Reulay journeys") and then defines the resource domain-specifically ("short guided stories, each a few pages about one mindset... shown as cards") so an agent can tell it apart from browse_library or start_journey. It stops short of explicitly naming a sibling to disambiguate against, so it is a 4 rather than a 5.

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 only guidance is "Optionally filter by mindset or words," which explains parameter usage rather than when to choose this tool. Nothing states the conditions for preferring it over browse_library, start_journey, or recommend_experience, and there are no exclusions or prerequisites.

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