Railway 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 mentions the tool lists projects but doesn't disclose behavioral traits like pagination, rate limits, authentication requirements, or error handling. While it hints at management use, it lacks operational details needed for full 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 (purpose, best for, next steps, related), but includes an emoji and formatting that slightly reduces efficiency. It's front-loaded with the core purpose, and each sentence adds value, though it could be more streamlined.

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 provides good usage context but lacks details on behavior (e.g., response format, errors) and operational constraints. For a list tool with no structured data, it's adequate but has gaps in completeness for agent invocation.

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 doesn't add param info, which is appropriate, but since there are no params, it doesn't compensate for any gaps. Baseline is 4 as per rules for 0 parameters.

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 purpose is unambiguous and directly addresses what the tool does.

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 guidance with 'Best for' scenarios (overview, finding IDs, discovery/management) and 'Next steps' (project_info, service_list) and 'Related' tools (project_create, project_delete), clearly indicating when to use this tool versus alternatives for specific needs.

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