rzil_init

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

With no annotations provided, the description carries full responsibility for disclosing behavior. It does disclose the session is persistent and that RzIL uses typed bitvectors, which adds meaningful context. However, it does not mention that sessions may need to be cleaned up via rzil_destroy, nor any side effects or resource considerations of initializing a VM.

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 contain all essential information: what the tool initializes, what it returns, and why RzIL is valuable. The key outcome (persistent session_id) is front-loaded, and the ESIL comparison earns its place by differentiating this tool from its closest siblings.

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?

The tool is simple (2 parameters, no output schema), but because there is no output schema the description should clarify what form the session_id takes. It also leaves the session lifecycle implicit, which matters for a persistent resource. Core usage is sufficiently clear, but the missing cleanup guidance and return format details are notable gaps.

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 100%, so the schema already documents binary_path and address adequately. The description does not add parameter-specific details such as address format or default behavior, but it does not need to because the schema handles this. Baseline 3 is appropriate.

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 names a concrete action ('Initialize the Rizin RzIL virtual machine') and its result ('return a persistent session_id'). It distinguishes this from the ESIL family of sibling tools by explicitly invoking RzIL and comparing it to ESIL. The purpose is immediately clear.

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 this tool is the entry point for subsequent RzIL tool calls, and it notes that RzIL has 'superior emulation fidelity compared to ESIL'. However, it does not explicitly state when to choose RzIL over ESIL, nor does it mention any scenario where ESIL would be preferable. Usage context is present but the selection boundary is left implicit.

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