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

With no annotations, the description carries the full burden and does well: it discloses the recurring side effect (daily/weekly emails of NEW matching jobs to the account email), an unsubscribe link, the 5-alert cap, and the important caveat that sending may not yet be switched on ('sending_enabled in the reply'). It omits failure behavior when the cap is hit or whether an alert can be edited later, which keeps it from a 5.

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?

Four tight sentences: identity first, then prerequisites, then the delivery behavior, then the filter list. The parentheticals are compressed but each carries load (A$/yr, ANZSCO, 'advertised pay'); nothing is redundant.

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?

No output schema, no annotations, nine params, and the description still covers prerequisites, limits, side effects, and the one return field worth knowing (sending_enabled). What's missing is only edge behavior: what happens at the 5-alert cap, whether duplicates are rejected, and how to reference the created alert later.

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 only 33%, but the description names all nine parameters plus semantics for the tricky ones: min_pay is annual advertised A$ pay, occupation is an ANZSCO prefix, frequency is daily or weekly, and the filter set mirrors search_jobs so the agent knows the matching semantics. That transparently compensates for the thin schema, though it gives no format hints for q/near/work_type.

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 and resource ('Save a job search as an email alert') with clear scope, and implicitly separates it from search_jobs (the search it snapshots), list_job_alerts and delete_job_alert by describing the delivery mechanism. An agent can identify this as the create/alert-subscription tool without opening the schema.

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?

Discloses prerequisites ('seeker key, Basic verified') and a hard constraint ('Max 5 alerts') that determine whether the call will succeed, and ties the filters to search_jobs so the agent knows to mirror a search. It does not explicitly say when to prefer this over, say, re-running search_jobs or when to use list_job_alerts first, so it stops short of full routing guidance.

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