Railway MCP Server

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

With no annotations provided, the description carries the full burden of behavioral disclosure. It implies a write operation ('Create a new Railway project') but doesn't specify permissions, rate limits, or response format. The 'Next steps' and 'Related' sections add useful context about workflow, but key behavioral traits like authentication needs or potential side effects are missing.

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 and front-loaded with the core purpose, followed by bullet-pointed guidelines. Every sentence earns its place: the first states the action, the next sections provide usage context, and the last links to related tools. No wasted words or redundancy.

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?

For a creation tool with no annotations and no output schema, the description does well by covering purpose, usage guidelines, and workflow context. However, it lacks details on behavioral aspects like permissions or response format, which would be helpful given the mutation nature. The high schema coverage compensates partially, but some gaps remain.

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?

Schema description coverage is 100%, so the schema fully documents the two parameters (name and teamId). The description doesn't add any parameter-specific information beyond what's in the schema, such as naming constraints or teamId usage details. Baseline 3 is appropriate when the schema handles parameter documentation.

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 tool's purpose with a specific verb ('Create') and resource ('new Railway project'), distinguishing it from siblings like project_delete, project_update, and project_list. It goes beyond the name/title by specifying it's for creating new projects, not duplicating existing ones.

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' and 'Not for' sections, listing specific use cases (starting new applications, setting up dev environments, creating project spaces) and exclusions (duplicating existing projects). It also suggests next steps and related tools, offering clear alternatives and context.

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