Commodore 64 Ultimate Computer MCP Server

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

With no annotations, the description carries full burden but lacks behavioral details. It implies a write/execution operation but doesn't disclose effects (e.g., machine state changes, program execution impact), permissions needed, error conditions, or side effects like halting other processes. This is inadequate for a tool that likely alters system behavior.

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, efficient sentence with zero waste—each word ('upload, load and execute') contributes to understanding the tool's purpose. It's appropriately sized and front-loaded, making it easy to parse quickly.

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's complexity (executing programs likely changes machine state), lack of annotations, and no output schema, the description is insufficient. It doesn't cover behavioral traits, return values, or error handling, leaving critical gaps for safe and effective use by an agent.

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%, with the parameter 'data' documented as 'Base64 encoded PRG file data'. The description adds no extra meaning beyond this, such as format specifics or constraints. Baseline 3 is appropriate since the schema fully covers the single parameter.

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 ('upload, load and execute') and resource ('a program file'), specifying it must be base64 encoded. It distinguishes from some siblings like 'load_prg_upload' (which only loads) and 'run_prg_file' (which uses a file instead of data), but could be more explicit about differences from tools like 'run_crt_upload' or 'modplay_upload'.

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?

No guidance is provided on when to use this tool versus alternatives. It doesn't mention prerequisites (e.g., machine state), exclusions, or compare to siblings like 'run_prg_file' (file-based) or 'load_prg_upload' (load-only), leaving the agent to infer usage from names alone.

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