set_registers

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

With no annotations provided, the description carries the full burden of behavioral disclosure. It clearly discloses that the tool mutates register state and requires the emulator to be paused, even naming the exact prior action. It does not detail failure behavior if called while running, but the stated precondition is the key behavioral trait.

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 with no filler. The core function and the critical prerequisite are front-loaded, and every word serves a purpose.

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 mutating debugger tool with no annotations, the description covers the purpose, the parameter shape, and the prerequisite. The presence of an output schema means return-value documentation is already handled externally. It could add more about downstream effects, but nothing essential for invoking it correctly 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?

The top-level schema coverage is 0%, so the description must compensate. It adds meaning with 'one or more' and 'by field name,' clarifying that the registers parameter is a partial mapping of named fields. The nested schema provides detailed descriptions and ranges for each register field, so the parameter semantics are reasonably complete.

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 action: 'Sets one or more C64 registers by field name.' This names a specific verb and resource, and the contrast with the sibling get_registers makes its purpose unambiguous.

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 gives an explicit precondition: 'Requires emulator to be stopped - call execute(action="pause") first if running.' This directly routes the agent to the correct sibling action and tells it when to do so, leaving no ambiguity about sequencing.

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