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

Annotations already declare readOnlyHint=true, destructiveHint=false and openWorldHint=false, so safety is covered. The description adds real value beyond that: it scopes the corpus (agencies listed on GCC Domestic across UAE, KSA, Kuwait, Qatar, Bahrain, Oman) and discloses return content (contact details, government-verified flag with a '1,300+ verified' figure, official registry link).

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?

The purpose and the scope constraint are front-loaded, and the sentence about returns is useful rather than filler. It is a dense single block, though, and the parenthetical enumeration of worker types is the one element that could be trimmed.

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 correctly takes on the burden of describing returns (contacts, verification status, registry link). It leaves minor gaps: the `limit` default of 10 and result pagination are only in the schema, and 'compare' is advertised without explaining what comparison output looks like.

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 baseline is 3. The description goes beyond the schema by explaining the filter combination logic (country, city and/or free-text name query), noting the query covers English or Arabic, and giving an intent-to-parameter mapping example for `city`.

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 names a specific verb set (find, list, compare) and a precise resource (maid/domestic-worker recruitment agencies), plus the geographic scope (six GCC countries). It also implicitly separates itself from sibling search_workers by targeting agencies rather than workers, and from verify_agency_licence by being a discovery rather than a verification tool.

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?

It gives explicit triggering context ('Use this for any "agencies in <place>" question') and a worked example mapping a natural-language phrasing to the `city` parameter. It stops short of naming when NOT to use it or pointing to a specific sibling alternative.

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