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nissand

WHOOP MCP Server

by nissand

whoop-get-workout-by-id

Retrieve detailed workout data from WHOOP by providing a specific workout ID to access performance metrics and exercise records.

Instructions

Get the workout record for the specified ID

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
workoutIdYesID of the workout record to retrieve

Implementation Reference

  • MCP server tool handler: validates workoutId input and calls WhoopApiClient.getWorkoutById to fetch and return the workout data as JSON.
    case 'whoop-get-workout-by-id': {
      if (!args || typeof args.workoutId !== 'string') {
        throw new Error('workoutId is required and must be a string');
      }
      const result = await this.whoopClient.getWorkoutById(args.workoutId);
      return {
        content: [
          {
            type: 'text',
            text: JSON.stringify(result, null, 2),
          },
        ],
      };
    }
  • Core API client method that performs the HTTP GET request to Whoop's /activity/workout/{workoutId} endpoint and returns the workout object.
    async getWorkoutById(workoutId: string): Promise<WhoopWorkout> {
      const response = await this.client.get(`/activity/workout/${workoutId}`);
      return response.data;
    }
  • Tool registration in the listTools response, defining name, description, and input schema (workoutId: string).
      name: 'whoop-get-workout-by-id',
      description: 'Get the workout record for the specified ID',
      inputSchema: {
        type: 'object',
        properties: {
          workoutId: {
            type: 'string',
            description: 'ID of the workout record to retrieve',
          },
        },
        required: ['workoutId'],
      },
    },
  • TypeScript interface defining the output structure of the Whoop workout data.
    export interface WhoopWorkout {
      id: string;
      v1_id: number;
      user_id: number;
      created_at: string;
      updated_at: string;
      start: string;
      end: string;
      timezone_offset: string;
      sport_name: string;
      sport_id: number;
      score_state: string;
      score?: WhoopWorkoutScore;
    }

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observed

TDQS

B3.3/5.0
Behavior2/5

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

Without annotations, the description should provide more behavioral context (e.g., requires authentication, returns 404 if not found). It only states the basic read action. Acceptable for a simple get, but lacks depth.

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?

Extremely concise with a single sentence stating the purpose. No redundant information.

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

Completeness3/5

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

For a simple get-by-ID tool with one parameter, the description is minimally complete. However, adding context about when to prefer this over get-workout-collection and error handling would enhance completeness.

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?

The input schema provides a clear description for the only parameter. The tool description does not add extra semantics beyond what the schema already covers. Baseline score of 3 is appropriate.

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

Purpose5/5

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

The description uses a specific verb ('Get') and resource ('workout record for the specified ID'), clearly distinguishing it from sibling tools that retrieve other resource types like cycles, sleep, or recovery.

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?

No usage guidelines provided. The description does not indicate when to use this single-record retrieval versus batch retrieval via get-workout-collection, nor any prerequisites or alternative tools.

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