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Mews MCP

by code-rabi

updateReservations

Modify hotel reservation details in Mews MCP, including dates, guest counts, room types, notes, and status changes.

Instructions

Updates reservation properties

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
ReservationUpdatesYesArray of reservation update objects

Implementation Reference

  • The execute method implementing the core logic of the updateReservations tool, which sends a POST request to the Mews API endpoint '/api/connector/v1/reservations/update' with the provided input arguments.
    async execute(config: MewsAuthConfig, args: unknown): Promise<ToolResult> {
      const inputArgs = args as Record<string, unknown>;
      const requestData = {
        ...inputArgs
      };
    
      const result = await mewsRequest(config, '/api/connector/v1/reservations/update', requestData);
      return {
        content: [{
          type: 'text',
          text: JSON.stringify(result, null, 2)
        }]
      };
    }
  • The inputSchema defining the expected input structure for the tool, requiring an array of ReservationUpdates objects with at least ReservationId.
    inputSchema: {
      type: 'object',
      properties: {
        ReservationUpdates: {
          type: 'array',
          items: {
            type: 'object',
            properties: {
              ReservationId: { type: 'string', description: 'Unique identifier of the reservation to update' },
              StartUtc: { type: 'string', description: 'Check-in date/time (ISO 8601)' },
              EndUtc: { type: 'string', description: 'Check-out date/time (ISO 8601)' },
              Notes: { type: 'string', description: 'Reservation notes' },
              State: { type: 'string', description: 'Reservation state' },
              SpaceCategoryId: { type: 'string', description: 'Space category ID' },
              AdultCount: { type: 'number', description: 'Number of adults' },
              ChildCount: { type: 'number', description: 'Number of children' }
            },
            required: ['ReservationId']
          },
          description: 'Array of reservation update objects'
        }
      },
      required: ['ReservationUpdates'],
      additionalProperties: false
    },
  • Registration of the updateReservationsTool in the central allTools array exported from the tools index.
    updateReservationsTool,
  • Import statement bringing the updateReservationsTool into the central tools index for registration.
    import { updateReservationsTool } from './reservations/updateReservations.js';
Behavior2/5

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

With no annotations provided, the description carries full burden for behavioral disclosure. 'Updates' implies a mutation operation, but it doesn't specify permissions required, whether changes are reversible, error handling, or rate limits. This is inadequate for a mutation tool with zero annotation coverage.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is a single, efficient sentence with zero wasted words. It's appropriately sized and front-loaded, directly stating the tool's purpose without unnecessary elaboration.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness2/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a mutation tool with no annotations and no output schema, the description is insufficient. It doesn't explain what happens when properties are updated, potential side effects, or return values. Given the complexity of updating multiple reservations with various properties, more behavioral context is needed.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 100%, so the input schema fully documents the 'ReservationUpdates' array and its nested properties. The description adds no additional parameter information beyond what's in the schema, resulting in the baseline score of 3 for adequate but no extra value.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose3/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description 'Updates reservation properties' clearly states the verb ('Updates') and resource ('reservation properties'), making the purpose understandable. However, it's somewhat vague about what specific properties can be updated and doesn't distinguish this tool from sibling tools like 'updateCompanies' or 'updateCustomers' beyond the resource type.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines2/5

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, constraints, or how it differs from related tools like 'addReservation' or 'cancelReservations', leaving the agent to infer usage from the tool name alone.

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

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