tts

Instructions

Implementation Reference

• src/index.ts:82-89 (schema)

  Schema definition for the 'tts' tool: defines name, description, and inputSchema with 'text' (required) and 'voice_description' (optional) parameters.

  {
    name: "tts",
    description: "Convert text to speech audio. Cost: 2 credits.",
    inputSchema: {
      text: z.string().describe("Text to convert to speech"),
      voice_description: z.string().optional().describe("Describe the voice, e.g. 'calm professional female'"),
    },
  },

• src/index.ts:246-259 (registration)

  Registration of all capabilities (including 'tts') as MCP tools via server.registerTool() in a loop. The handler delegates to the generic callSuprsonic() function.

  // Register each capability as an MCP tool
  for (const cap of CAPABILITIES) {
    // Cast inputSchema to avoid TS2589 (excessively deep type instantiation from Zod chains)
    server.registerTool(
      cap.name,
      {
        description: cap.description,
        inputSchema: cap.inputSchema as any,
      },
      async (args: any): Promise<CallToolResult> => {
        return callSuprsonic(cap.name, args as Record<string, unknown>);
      },
    );
  }

• src/index.ts:183-234 (handler)

  Generic handler function callSuprsonic() that executes all tool logic by calling the Suprsonic REST API (/v1/agent). The 'tts' tool name is passed as the 'capability' parameter along with its arguments.

  async function callSuprsonic(capability: string, params: Record<string, unknown>): Promise<CallToolResult> {
    if (!API_KEY) {
      return {
        content: [{ type: "text", text: "Error: SUPRSONIC_API_KEY environment variable is not set. Get your key at https://suprsonic.ai/app/apis" }],
        isError: true,
      };
    }
  
    try {
      const resp = await fetch(`${BASE_URL}/v1/agent`, {
        method: "POST",
        headers: {
          "Authorization": `Bearer ${API_KEY}`,
          "Content-Type": "application/json",
        },
        body: JSON.stringify({ capability, params }),
      });
  
      const result = await resp.json() as any;
  
      // Handle non-envelope responses (401, 429, etc. return {"detail": ...})
      if (result.detail && result.success === undefined) {
        const msg = typeof result.detail === "object" ? (result.detail.title || result.detail.detail || JSON.stringify(result.detail)) : String(result.detail);
        return {
          content: [{ type: "text", text: `Error (HTTP ${resp.status}): ${msg}` }],
          isError: true,
        };
      }
  
      if (!result.success) {
        const errMsg = result.error?.detail || result.error?.title || "Request failed";
        return {
          content: [{ type: "text", text: `Error: ${errMsg}` }],
          isError: true,
        };
      }
  
      const text = JSON.stringify(result.data, null, 2);
      const meta = result.metadata
        ? `\n\n[Provider: ${(result.metadata as any).provider_used || "unknown"}, ${(result.metadata as any).response_time_ms || 0}ms, ${result.credits_used || 0} credits]`
        : "";
  
      return {
        content: [{ type: "text", text: text + meta }],
      };
    } catch (err) {
      return {
        content: [{ type: "text", text: `Network error: ${err instanceof Error ? err.message : String(err)}` }],
        isError: true,
      };
    }
  }

• src/index.ts:30-34 (helper)

  The CapabilityDef interface that defines the shape used for all tool definitions including 'tts'.

  interface CapabilityDef {
    name: string;
    description: string;
    inputSchema: Record<string, z.ZodType>;
  }