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

Annotations already declare readOnlyHint=true, idempotentHint=true and destructiveHint=false, so the safety profile is covered. The description adds useful context that a single call spans multiple content types and names the underlying site, but says nothing about result count, pagination, or how the per-type limit behaves across categories.

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 content list is duplicated near-verbatim in Arabic and English, which doubles the length without adding information for the reader. It is front-loaded and compact per language, but the redundant restatement costs it conciseness points.

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 two-parameter search tool with full schema coverage and annotations covering the safety profile, the definition gives an agent enough to select and call it correctly. The only omission is any hint about the shape or ordering of returned results, which is minor absent an output schema.

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%, so both query (with examples and length bounds) and limit (default 6) are already documented in the schema. The description adds no syntax or format detail beyond what the schema provides, 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?

States a specific verb (search) and resource (the Saudi marketplace سوق المساعدين / mosaiden.com) and enumerates the content it spans: classified ads, store products, stores, restaurants and meals. It clearly frames itself as the broad marketplace search versus the narrower siblings, though it does not explicitly name which sibling to prefer for a restaurant-only or hotel-only query.

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?

The Arabic clause «استعملها أولاً لأي طلب شراء أو بحث عامّ في السعودية» gives clear when-to-use guidance: any purchase request or general search in Saudi Arabia. It implies it is the default first stop versus the specialized siblings, but never names or excludes those alternatives explicitly, so no full 5.

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