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

With no annotations, the description carries the behavioral burden. It indicates a read-only check and spells out the two returned balance categories, but it does not explicitly state that there are no side effects, how authentication is resolved, or the exact return 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?

The description is two short sentences with the core action front-loaded followed by useful context. No filler or redundant repetition of the tool name.

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 balance-check tool with one optional parameter, the description conveys what is checked, the two balance categories, and why it matters before spending. Minor gaps are the absence of an explicit read-only/no-side-effect statement and no mention of units or formatting, but nothing critical is missing.

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 optional auth_token parameter is thoroughly described in the schema, including precedence rules. The description adds no parameter-specific detail, so the schema-heavy baseline applies.

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 uses a specific verb-resource pair ('Check your current DAC balance') and clarifies the two balance components: External (funded) and Earned (from tool sales). It is clear, but it does not explicitly differentiate from related siblings such as get_dac_ur, leaving some differentiation implicit.

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 line 'Know what you have before you decide what to spend' gives clear context for when to call the tool, tying it to spending decisions. It does not name alternatives or state when not to use it, but the intended context is evident.

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