pyxel-mcp

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 implies a read-only operation ('Get') and specifies the three data points returned, which is helpful. However, it doesn't disclose behavioral traits like error handling (e.g., if Pyxel isn't installed), performance (e.g., fast local lookup), or output format details (though an output schema exists).

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. It front-loads the core action ('Get Pyxel installation info') and immediately lists the specific outputs, making it easy to parse. Every word contributes directly to understanding the tool's function.

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 low complexity (0 parameters, read-only operation) and the presence of an output schema (which handles return values), the description is reasonably complete. It clearly states what information is retrieved. However, it lacks context on usage scenarios or error conditions, which would be beneficial for 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?

The tool has 0 parameters, and schema description coverage is 100% (empty schema). The description doesn't need to explain parameters, so it appropriately focuses on the tool's purpose. No additional parameter semantics are required, making this above baseline.

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 specific action ('Get') and the resource ('Pyxel installation info'), listing the exact information returned (package location, examples path, API stubs path). It distinguishes itself from sibling tools like 'capture_frames' or 'inspect_sprite' by focusing on installation metadata rather than game state inspection.

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. It doesn't mention prerequisites (e.g., Pyxel must be installed), typical use cases (e.g., debugging setup), or exclusions (e.g., not for runtime game data). With 13 sibling tools, this lack of context leaves the agent guessing about appropriate selection.

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