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

Annotations supply readOnlyHint=true, so the safety profile is covered, and the description adds genuinely new behavioral context: results come back in a 'paged envelope', which tells the agent to expect pagination rather than a flat array. It still omits things like rate limits, auth scopes, or whether data freshness requires a prior refresh, which keeps it out of 5 territory.

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 compact fragments: purpose + returned fields, then the raw API endpoint, then the envelope note. It is front-loaded and free of filler, though the endpoint path is arguably operator-facing detail that pads the line.

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?

With no output schema, the description carries the return-value burden and does so by naming the top-level fields and the paged envelope. Combined with the fully documented input schema and the readOnly annotation, an agent has enough to invoke it correctly, though pagination defaults and refresh expectations are left unstated.

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 all five parameters (page, query, orderBy, pageSize, companyId) are already documented in the schema with examples. The description only lists response fields, not parameter behavior, so the 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?

The description gives a specific verb and resource ('List a company's journal entries') and even enumerates the fields returned (id, postedOn, createdOn, journalLines...), so the agent knows exactly what entity is being fetched. It does not, however, contrast itself with any sibling list tool (bills, invoices, payments), so it stops short of 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?

There is no statement of when to use this tool versus the many other codat_list_* siblings, nor any prerequisite or exclusion. The endpoint path implies a straightforward read of one company's data, but the agent must infer that from the name alone.

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