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

Annotations already declare readOnlyHint=true and openWorldHint=true, so the safety profile is covered. The description adds the underlying endpoint (GET /vendors/{id}), which hints at a direct remote read, but says nothing about error behavior for a missing id or whether a 404-style result is surfaced.

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?

One compact sentence with the identity and the provenance of the key argument front-loaded, plus a terse endpoint reference. Nothing 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?

For a one-parameter read this is nearly sufficient, and the annotations carry the safety profile. However, with no output schema there is no structured signal about what a vendor record contains or how a missing id is reported, so the description leaves a small but real gap.

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% and the single 'id' parameter is already documented as 'Vendor id.' with type constraints. The description goes slightly beyond by saying where valid ids come from (jurnal_list_vendors), which is genuine added meaning over the schema.

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 ('Get one vendor by id') and disambiguates from the sibling list tool by naming jurnal_list_vendors as the id source. An agent can distinguish this from jurnal_list_vendors and jurnal_get_customer without reading either 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?

The parenthetical '(from jurnal_list_vendors)' tells the agent the prerequisite step and implicitly when to reach for this tool. It doesn't state exclusions or what to do if the id is unknown, but the usage context is clear for a simple single-record fetch.

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