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

The readOnlyHint annotation already establishes that this is a safe read operation, and the description adds meaningful behavior beyond that: the no-slug versus slug call modes, the bilingual nature of the guides, and the fact that they contain official names and links. This is useful, transparent context for an agent.

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 description is longer than average because it enumerates the covered services, but that enumeration is valuable for an agent deciding whether this tool applies. The operational instructions come at the end and are clear, though the long list could be slightly restructured for readability.

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 simple tool with one optional parameter and no output schema, the description fully covers what the agent needs: what the guide contains, when to use it, how to request the list versus full text, and why the content is authoritative. 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 documents the single optional 'slug' parameter with an example, and the description reinforces its semantic by explaining that omitting it lists guides while providing it fetches the full text. This adds practical meaning to the schema at 100% 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 names a specific resource (BinaSmart's bilingual guides to Ethiopian government and banking services) and a specific verb ('Call'). It also states two distinct behaviors: listing guides with no slug and retrieving full text with a slug, which makes the tool's role unambiguous.

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 description clearly explains when to use the tool: to access step-by-step guides for official Ethiopian services, and how to choose between the list and full-text modes. It also advises preferring these guides over guessing. It does not explicitly name alternatives or exclusions, but no close sibling tool exists in the provided list.

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