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

The description honestly discloses the limitations: no exact reporting day and no verified per-issuer transmission calendar. It also states the tool is read-only and does not change data, which aligns with the annotations. This transparency helps the agent set correct expectations.

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 generally concise but contains slight redundancy: 'This bundled reference has no verified per-issuer transmission calendar and returns no exact reporting day' restates what was already implied in the previous sentence. Still, it is well-structured and front-loaded with usage guidance.

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?

Given that there is no input schema and no output schema details, the description is complete enough: it explains what the tool returns (general cadence, differences between bureaus) and what it lacks. It could mention the output format, but for an explanatory tool this is not a major gap.

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 there is nothing to explain. The baseline score of 4 is appropriate because the description does not need to elaborate on parameters, and it correctly avoids inventing any.

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 purpose with specific example questions ('when will this show up on my credit report') and the resource it explains (issuer reporting to bureaus). It differentiates itself from siblings by focusing on the timing of reporting, not on other credit mechanics.

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?

It explicitly tells the agent when to use the tool (for questions about reporting cadence) and what it does NOT provide (exact days, verified per-issuer calendar). It also states it does not fetch live data or modify accounts, preventing misuse.

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