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

With no annotations, the description carries the full burden. It notes 'No auth required' but fails to mention pagination, return format, or read-only nature. More critically, it mentions 'capacity' as a filter option that does not exist in the input schema, which is misleading to the 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 a single, readable sentence that front-loads the purpose and lists filters compactly. The 'capacity' mention is extraneous and not schema-backed, so it is slightly less concise 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?

For a simple list tool with full schema coverage, the description is adequate. However, with no output schema, it might be expected to mention return values or pagination. The capacity discrepancy also creates a completeness gap. Overall, it's serviceable but not thorough.

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% (both parameters documented), so the baseline is 3. The description repeats the category list and region example, adding little beyond the schema. It also introduces a non-existent 'capacity' parameter, which reduces its value.

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 clearly states 'List DePIN provider listings' with a specific verb and resource, distinguishing it from sibling tools like depin_create_listing (write) and depin_get_match_fee (fee lookup). The filter options are enumerated, making the tool's purpose 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 implies usage for browsing providers with optional filters and notes 'No auth required', but it does not explicitly state when to use this tool vs alternatives or provide exclusions. The sibling tools are clearly different, but the guidance is only implicit.

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