variable_set

Create or update environment variables to manage configuration values, connection strings, and service secrets on the Railway MCP server, ensuring secure and precise service setups.

Instructions

[API] Create or update an environment variable

⚡️ Best for: ✓ Setting configuration values ✓ Updating connection strings ✓ Managing service secrets

⚠️ Not for: × Bulk variable updates (use variable_bulk_set) × Temporary configuration changes

→ Prerequisites: service_list

→ Alternatives: variable_bulk_set

→ Next steps: deployment_trigger, service_restart

→ Related: variable_list, variable_delete

Input Schema

Name	Required	Description
`environmentId`	Yes	ID of the environment for the variable (usually obtained from service_list)
`name`	Yes	Name of the environment variable
`projectId`	Yes	ID of the project containing the service
`serviceId`	No	Optional: ID of the service for the variable, if omitted creates/updates a shared variable
`value`	Yes	Value to set for the variable

Input Schema (JSON Schema)

{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "additionalProperties": false,
  "properties": {
    "environmentId": {
      "description": "ID of the environment for the variable (usually obtained from service_list)",
      "type": "string"
    },
    "name": {
      "description": "Name of the environment variable",
      "type": "string"
    },
    "projectId": {
      "description": "ID of the project containing the service",
      "type": "string"
    },
    "serviceId": {
      "description": "Optional: ID of the service for the variable, if omitted creates/updates a shared variable",
      "type": "string"
    },
    "value": {
      "description": "Value to set for the variable",
      "type": "string"
    }
  },
  "required": [
    "projectId",
    "environmentId",
    "name",
    "value"
  ],
  "type": "object"
}

railway-mcp

variable_set

Instructions

Input Schema

Input Schema (JSON Schema)

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MCP directory API