Manifold Markets MCP Server

Instructions

Implementation Reference

• src/index.ts:900-937 (handler)

  Handler for follow_market tool: Parses input with FollowMarketSchema, checks for MANIFOLD_API_KEY, makes POST request to /v0/follow-contract with contractId and follow boolean, returns success message.

  case 'follow_market': {
    const params = FollowMarketSchema.parse(args);
    const apiKey = process.env.MANIFOLD_API_KEY;
    if (!apiKey) {
      throw new McpError(
        ErrorCode.InternalError,
        'MANIFOLD_API_KEY environment variable is required'
      );
    }
  
    const response = await fetch(`${API_BASE}/v0/follow-contract`, {
      method: 'POST',
      headers: {
        'Content-Type': 'application/json',
        Authorization: `Key ${apiKey}`,
      },
      body: JSON.stringify({
        contractId: params.contractId,
        follow: params.follow,
      }),
    });
  
    if (!response.ok) {
      throw new McpError(
        ErrorCode.InternalError,
        `Manifold API error: ${response.statusText}`
      );
    }
  
    return {
      content: [
        {
          type: 'text',
          text: params.follow ? 'Now following market' : 'Unfollowed market',
        },
      ],
    };
  }

• src/index.ts:107-110 (schema)

  Zod schema defining input for follow_market: contractId (string), follow (boolean).

  const FollowMarketSchema = z.object({
    contractId: z.string(),
    follow: z.boolean(),
  });

• src/index.ts:349-360 (registration)

  Tool registration in listTools response, including name, description, and inputSchema matching the Zod schema.

  {
    name: 'follow_market',
    description: 'Follow or unfollow a market',
    inputSchema: {
      type: 'object',
      properties: {
        contractId: { type: 'string', description: 'Market ID' },
        follow: { type: 'boolean', description: 'True to follow, false to unfollow' }
      },
      required: ['contractId', 'follow']
    }
  },