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

Annotations already declare readOnly, idempotent and non-destructive, so the safety profile is covered. The description adds behavior the annotations do not: it caps input at two-to-five ids, requires ids sourced from search results, and discloses the derived comparison verdicts (best pay, newest, remote).

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 purpose and the routing examples, then the return summary. The trailing field list is somewhat long but each item (pay, work type, visa sponsorship, ghost-job check) is informative, so little 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?

With no output schema, the description carries the burden of explaining returns and does so explicitly, plus input constraints and comparison verdicts. An agent has everything needed to select and invoke 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 coverage is 100% for the single param, so the baseline is 3. The description nonetheless adds meaning beyond the schema: the ids must originate from search results and are bounded to two-to-five, reinforcing the 'copied exactly' provenance the schema only hints at.

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+resource ('Compare jobs side by side') and enumerates exactly what the comparison yields (pay, work type, visa sponsorship, ghost-job check, best-on metrics). This clearly separates it from sibling jobspotter_get_job (single job) and jobspotter_similar_jobs.

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?

Quoted user phrasings ('compare the first three', 'which of these pays best?') and the 'two to five ids from search results' constraint give clear activation context. It stops short of naming an explicit alternative or a when-not-to-use case, so it is strong but not fully prescriptive.

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