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. It explains this is for authentication configuration and mentions it's only needed if not set in environment variables, which adds useful context. However, it doesn't disclose important behavioral aspects like whether this persists the token, what format it expects, or potential error conditions.

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 (utility tag, main description, best for/not for lists, next steps, related tools). Every sentence earns its place, and the information is front-loaded with the core purpose stated first.

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 single-parameter authentication configuration tool with no output schema, the description provides good contextual information about when to use it and what it's not for. However, without annotations and with no output schema, it could benefit from more details about what happens after configuration (e.g., token validation, persistence mechanism).

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 already documents the single 'token' parameter with its description. The description doesn't add any additional parameter semantics beyond what's in the schema, maintaining the baseline score of 3 for high schema coverage.

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 ('Configure the Railway API token for authentication') and resource ('Railway API token'), distinguishing it from sibling tools like project configuration or service settings. It explicitly mentions this is for authentication setup only, not for other configuration tasks.

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, clearly indicating when to use this tool (initial setup, token updates, authentication configuration) and when not to use it (project configuration, service settings, environment variables). It also suggests next steps and related tools.

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