c2b_simulate

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

With no annotations, the description must carry behavioral disclosure. It discloses a key constraint (sandbox-only) but does not explain what the simulation actually does—e.g., whether it triggers a callback, returns a success response, or has side effects. This is minimal but non-tautological information.

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, front-loaded sentence that conveys the essential purpose without unnecessary words. Every word contributes value, and it is appropriately short for a tool with a clear focus.

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 the tool has 5 parameters, no output schema, and no annotations, this brief description is insufficient. It does not explain required versus optional parameters, what response to expect, or any post-simulation behavior (e.g., callback triggering). The agent would need additional context to use it correctly.

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 description coverage is 0%, and the description does not mention any parameter names or semantics. It only implicitly references concepts like 'shortcode', but does not explain the roles of phoneNumber, amount, commandId, shortCode, or billRefNumber, leaving the agent to infer from names alone.

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 a specific verb ('Simulate') and resource ('a customer paying your shortcode'). It distinguishes itself from sibling payment tools (e.g., b2c_payment, stk_push) by emphasizing simulation, and the 'Sandbox and simulator only' note further clarifies its role.

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 phrase 'Sandbox and simulator only' explicitly tells the agent when to use this tool (in testing/sandbox environments) and implies it should not be used for production payments. While no alternative tools are named, the simulation framing naturally contrasts with real payment operations among siblings.

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