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

Annotations already declare readOnlyHint=true, so the safe-read profile is covered. The description adds no return-shape, pagination, default-limit, or no-filter behavior context, so with annotations carrying the safety burden a 3 is appropriate.

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?

Purpose is front-loaded in the first clause, followed by the two parameter hints. The long process enumeration is dense but each item earns its place as the only enumeration of valid values; still, a single unwieldy sentence is slightly less scannable than it could be.

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?

No output schema exists, so return values need not be explained. However, with zero required parameters the description should say what happens when called with no filters (return everything? cap at limit?) and whether limit has a default, which it does not.

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?

With 75% schema coverage, the schema already documents limit and country format. The description genuinely adds value by enumerating all valid process ids (laser-cutting, cnc-machining, etc.), which the schema lacks as an enum, and restates the accepted country formats. It is silent on the city parameter, keeping it below a 5.

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+resource+scope: 'Find contract manufacturers in the directory by country and process.' An agent knows exactly what it returns. It does not, however, explicitly distinguish itself from the sibling match_manufacturers, so it falls short of a 5.

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?

There is no explicit when-to-use or when-not-to-use guidance, and no mention of the sibling match_manufacturers as an alternative for a different matching task. Usage is only implied by the phrase 'in the directory'.

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