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

Annotations already declare readOnlyHint=true, idempotentHint=true, destructiveHint=false and openWorldHint=false, so the safety profile is covered. The description adds the 'free' filter and web-page parity, but says nothing about ordering, pagination, or result shape.

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, front-loaded sentence per language with no filler. The bilingual duplication is mildly redundant but justified for a locale-aware tool.

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 one-optional-param read tool with no output schema and full annotation coverage, the description is broadly sufficient for selection. It falls short on locale behavior, which matters given the tool is locale-scoped.

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 single locale parameter has 0% schema description coverage, and the description never mentions locale or what the enum values do. The /zh/clients/ reference weakly implies a zh default, which is not enough to compensate for an entirely undocumented parameter.

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 (list) and resource (entries usable as free AI coding clients), plus a scope anchor ('same set as /zh/clients/'). That clearly separates it from the offers/recent_changes siblings, though it doesn't name a sibling directly.

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?

Usage is only implied: an agent can infer 'call this to get the client list,' but there is no explicit when-to-use, when-not, or alternative tool named. The /zh/clients/ parity note hints at scope but not at routing.

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