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. It states the action ('Start') but doesn't disclose behavioral traits like whether this requires specific permissions, if it's a persistent operation, what happens if a stream is already running, or any rate limits. The mention of 'U64 only' adds some context about format restrictions, but key behavioral aspects are missing for a tool that initiates streams.

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 extremely concise and front-loaded in a single sentence, with zero wasted words. Every part ('Start a video/audio/debug stream (U64 only)') directly contributes to understanding the tool's purpose and constraints, making it highly efficient.

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 complexity of starting a stream (which likely involves network and media handling), no annotations, and no output schema, the description is incomplete. It lacks details on permissions, error conditions, stream persistence, or what the tool returns. The 'U64 only' note adds some context, but overall, it doesn't provide enough information for safe and effective use in a broader context.

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 input schema has 100% description coverage, clearly documenting both parameters ('stream' and 'ip') with their purposes. The description adds minimal value beyond the schema by implying the stream types ('video/audio/debug') and format constraint ('U64 only'), but doesn't provide additional syntax or usage details. With high schema coverage, the baseline score of 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 clearly states the action ('Start') and resource ('a video/audio/debug stream'), with specificity about the format ('U64 only'). It distinguishes from sibling 'stream_stop' by indicating the opposite operation. However, it doesn't explicitly differentiate from other streaming or media-related tools in the list, which slightly reduces clarity.

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, such as other streaming or media tools in the sibling list. It mentions 'U64 only' as a constraint but doesn't explain when this format is required or what alternatives exist for other formats. No explicit when/when-not or alternative tool references are provided.

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