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

The annotations already declare readOnlyHint=true, idempotentHint=true, destructiveHint=false and openWorldHint=false, fully covering the safety profile. The description adds the markdown return claim and usage motivation, but since an output schema exists that return note is largely redundant, leaving little behavioral disclosure beyond 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?

Three short, front-loaded sentences: what it fetches, how to find topics, and when to reach for it. No sentence is filler and the purpose leads.

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 one-parameter read tool with a full enum, complete annotations, and an output schema, nothing needed to call it correctly is missing. Discovery (list_guides) and the motivating precondition (before authoring) are both covered.

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% and the single topic parameter is a fully enumerated 14-value enum documented in the schema. The description points to list_guides for topic discovery but adds no syntax or format detail beyond what the schema already provides, so baseline 3 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?

States a specific verb (Fetch) and resource (a Tessryx guide) scoped by topic, and states the return format directly in the description (markdown). It is clearly distinguishable from the sibling list_guides, which it names.

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?

Explicitly names the alternative tool (list_guides to discover topics) and gives a when-to-use condition: 'Reach for the relevant guide before authoring to avoid trial-and-error.' Both the discovery path and the trigger condition are supplied.

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