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

With no annotations, the description carries the full burden of behavioral disclosure. It reveals the semantic-search nature, says it returns 'best-matching passages with a source url to cite,' and adds a truthfulness constraint ('never invent a fare or an official portal name'). It does not discuss failure modes, rate limits, or output structure, 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?

The definition is two sentences and front-loaded with the core purpose, but the first sentence is a long list-heavy enumeration. The list is useful for routing queries to the right tool, so it is not padding, but it is denser than necessary.

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 2-parameter tool with no annotations and no output schema, the description provides purpose, scope, return format, and usage timing, which is enough to select and invoke it correctly. It could add explicit exclusions or a contrast with search_places, but nothing critical is missing.

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?

The input schema already describes both parameters fully: query (question/keywords, English or Amharic, length bounds) and k (integer 1-8, default 4). The description adds no parameter-specific detail, so the baseline of 3 applies given 100% schema coverage.

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 opens with 'Semantic search over BinaSmart's knowledge base' and then enumerates the exact domains (services, product rules, guides, Addis Ababa knowledge), making the verb, resource, and scope explicit. It also distinguishes itself from siblings like search_places and get_ethiopia_guide by listing the full breadth of content it covers.

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 contains a direct usage directive: 'Use it before answering any question about BinaSmart, Ethiopia paperwork or getting around Addis' and warns against inventing facts. It does not mention when not to use it or compare against search_places, so it stops short of full when/when-not guidance.

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