Commodore 64 Ultimate Computer MCP Server

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

No annotations are provided, so the description carries the full burden of behavioral disclosure. It mentions 'upload and play' but doesn't specify what happens during playback (e.g., audio output, duration, controls), whether it's destructive to system state, or any permissions/rate limits. This is inadequate for a tool that likely involves media processing.

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 that front-loads the core action ('upload and play') and resource ('Amiga MOD file'), with no wasted words. It's appropriately sized for a tool with one parameter and clear 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?

Given no annotations and no output schema, the description is incomplete. It doesn't explain what 'play' entails (e.g., audio playback, visual feedback, error handling) or the return values, which is insufficient for a tool that likely produces media output or status updates.

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 description adds that the MOD file must be 'base64 encoded', which provides context beyond the schema's 'Base64 encoded MOD file data' for the single parameter 'data'. With 100% schema description coverage, this extra detail is minimal but helpful, meeting the baseline for adequate parameter semantics.

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 verb 'upload and play' and the resource 'an Amiga MOD file (base64 encoded)', making the purpose immediately understandable. However, it doesn't distinguish itself from sibling tools like 'modplay_file' or 'sidplay_upload', which appear to be related media playback tools, so it misses the highest score.

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 provides no guidance on when to use this tool versus alternatives. With sibling tools like 'modplay_file' and 'sidplay_upload' present, there's no indication of when this upload-based MOD playback is preferred over file-based methods or other media types, leaving usage unclear.

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