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

readOnlyHint=true already tells the agent this is a safe read, so the bar is lower. The description goes beyond the annotation by disclosing the shape of the returned data (ids plus behaviour values pending/completed) and the underlying endpoint, which matters because there is no output schema. It still omits auth/pagination/rate-limit details.

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 compact sentence, front-loaded with the verb and resource, with the payload description and endpoint appended. The endpoint reference is mildly redundant but useful for a bare list call; nothing else is wasted.

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 zero-parameter read-only lister with no output schema, the description supplies the essential missing piece — what the response contains — so an agent can call it and interpret the result. Auth behaviour and pagination are unstated but minor for a small static status list.

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?

This tool takes zero parameters, so per the rubric the baseline is 4. The description adds nothing about inputs because there are none to describe, and the empty schema is fully consistent with the narrative.

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 and resource ('List ticket statuses') and adds what the result contains (ids and behaviour, pending/completed), which distinguishes it from sibling listers like happyfox_list_priorities or happyfox_list_categories by resource name. It stops short of explicitly contrasting itself with a specific sibling, so it sits just below the top band.

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?

'ids used to change a ticket's status' implies the usage context (fetch ids, then use them in a status-change call), but the description never states when to reach for this tool versus alternatives or any prerequisites. Usage is implied rather than instructed.

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