picdefense_get_credits

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

With no annotations, the description carries the transparency burden. It adds useful behavioral context by explaining that other analysis tools consume credits, implying this tool is a read-only balance check. It does not explicitly state 'does not consume credits', but the framing makes that clear enough for this simple getter.

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?

Two sentences only. The first sentence is a front-loaded purpose statement, the second adds a practical usage hint. No wasted words; every sentence earns its place.

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 zero-parameter, read-only balance retrieval tool with no output schema, the description fully covers what the agent needs to know: what the tool does and when to use it. The sibling context and credit-consumption note provide a complete mental model for this simple tool.

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 tool has zero parameters, so the baseline is 4. The description correctly avoids fabricated details about parameters. It adds no semantic noise, and the empty schema is consistent with the description.

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 the tool's function with a specific verb and resource: 'Get the remaining credit balance on your PicDefense.io account.' This unambiguously distinguishes it from the sibling image analysis tools, making it immediately clear that this is an account utility, not an analysis tool.

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?

Provides explicit usage context: 'check this first if calls start failing with "insufficient credits"'. This tells the agent exactly when to invoke it, covering a common failure mode. No alternatives are needed as it is a unique utility among the siblings.

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