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 of behavioral disclosure. It states it's a list operation, implying read-only behavior, but doesn't cover critical aspects like authentication needs, rate limits, pagination, error handling, or the format of returned data. For a tool with zero annotation coverage, this leaves significant gaps in understanding how it behaves in practice.

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 that front-loads the core action ('List all environments in a project') with zero wasted words. It's appropriately sized for a simple list tool, making it easy to parse quickly without unnecessary elaboration.

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 (1 parameter, 100% schema coverage, no output schema), the description is minimal but incomplete. It lacks behavioral details (e.g., read-only nature, data format), usage context, and output expectations. While concise, it doesn't provide enough information for an agent to fully understand the tool's operation without relying heavily on the schema alone.

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 100% description coverage, with 'projectId' clearly documented as 'ID of the project'. The description adds no additional parameter semantics beyond what the schema provides, such as examples or constraints on the ID format. With high schema coverage, the baseline score of 3 is appropriate, as the description doesn't compensate but also doesn't detract.

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 verb ('List') and resource ('environments in a project'), making the purpose immediately understandable. It distinguishes itself from siblings like 'project_list' (which lists projects) and 'project_info' (which gets details of a single project). However, it doesn't specify the scope (e.g., 'all' is implied but not emphasized) or differentiate from potential environment-specific tools that might exist elsewhere.

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., needing a valid projectId), exclusions (e.g., not for creating or modifying environments), or comparisons with siblings like 'deployment_list' or 'service_list' that might relate to environments. Usage is implied by the action 'List' but lacks explicit context.

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