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

Annotations already declare readOnlyHint=true, so the safety profile is covered. The description adds useful behavioral context by enumerating the fields and sub-objects returned (subject, requester, assignee, status, SLA metrics, custom fields, last post preview), which is valuable given there is no output schema, though it says nothing about errors, permissions, or rate limits.

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?

Front-loaded with the core purpose and returned fields, followed by compact parameter guidance and the underlying endpoint. Every sentence contributes, though the raw REST path is arguably extraneous for an agent that invokes a tool rather than an HTTP endpoint.

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 simple get-by-id tool, the description is complete: purpose, returned content, parameter usage, and safety annotation coverage are all present. Since there is no output schema, listing the key returned fields compensates adequately, and an agent has everything needed to call it correctly.

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 the schema already documents all three parameters with examples. The description reinforces include ('expand references') and fields ('+tags' for tags) but adds little syntax or meaning beyond what the schema provides, matching the baseline for high coverage.

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 (one case/conversation) with a clear scope constraint (by id), and enumerates the returned fields. The 'one case by id' framing distinguishes it from the sibling list/search tools such as kayako_list_cases and kayako_search.

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?

Usage is implied: call it when you have a case id and need a single case. It describes how to use the include and fields parameters, but never states when to choose this tool over kayako_list_cases, kayako_search, or kayako_list_case_posts, nor does it mention any exclusions or prerequisites.

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