Railway MCP Server

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

No annotations are provided, so the description carries full burden. It states this is an API tool for listing projects, implying a read-only operation, but doesn't disclose behavioral details like authentication requirements, rate limits, pagination, or response format. The description adds basic context but lacks operational transparency.

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 well-structured with clear sections (API context, Best for, Next steps, Related) and uses bullet points for readability. It's appropriately sized for a simple tool, though the emoji and formatting slightly reduce conciseness. Every sentence adds value without waste.

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 simplicity (0 parameters, no output schema, no annotations), the description covers purpose and usage well but lacks behavioral context like response format or error handling. It's adequate for a basic list tool but could be more complete by addressing what the output contains or how to interpret results.

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 0 parameters with 100% coverage, so no parameter documentation is needed. The description appropriately doesn't discuss parameters, focusing instead on usage and context. A baseline of 4 is applied since no parameters exist, and the description adds value without redundancy.

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 ('List all projects') and resource ('in your Railway account'), distinguishing it from siblings like project_info (detailed info), project_create (creation), and project_delete (deletion). The title 'project_list' aligns perfectly with the described functionality.

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 explicit usage guidance with a 'Best for' section listing specific use cases (overview, finding IDs, discovery/management) and 'Next steps' suggesting follow-up tools (project_info, service_list). It also mentions 'Related' tools (project_create, project_delete) to clarify alternatives.

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