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emails

Find a professional email address using a person's first name, last name, and company domain. Each lookup costs 2 credits.

Instructions

Find a professional email address by name and company domain. Cost: 2 credits.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
first_nameYesPerson's first name
last_nameYesPerson's last name
domainYesCompany domain (e.g. stripe.com)

Implementation Reference

  • Schema definition (CapabilityDef) for the 'emails' tool: defines required inputs (first_name, last_name, domain) and description.
    {
      name: "emails",
      description: "Find a professional email address by name and company domain. Cost: 2 credits.",
      inputSchema: {
        first_name: z.string().describe("Person's first name"),
        last_name: z.string().describe("Person's last name"),
        domain: z.string().describe("Company domain (e.g. stripe.com)"),
      },
    },
  • src/index.ts:247-259 (registration)
    Registration: the 'emails' tool is registered via a generic loop over CAPABILITIES using server.registerTool().
    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>);
        },
      );
    }
  • Handler: the generic callSuprsonic function that handles ALL tools including 'emails'. It sends the capability name and params to the Suprsonic REST API at POST /v1/agent.
    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,
        };
      }
    }
Behavior2/5

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

The description lacks behavioral details beyond the cost. It does not disclose whether the email is guaranteed to exist, what happens if not found, or any authorization or rate limit information. With no annotations, the description should carry this burden but fails to do so.

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

Conciseness4/5

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

The description is a single sentence, which is very concise. However, it front-loads the main action and cost, and there is no superfluous information. Slightly more structured format could improve readability.

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?

Given the lack of output schema and annotations, the description is incomplete. It does not explain the return value (the actual email address), error handling, or any limitations. For a paid tool (2 credits), more context would be beneficial.

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 already provides clear descriptions for all three parameters (first_name, last_name, domain). The description adds context about the expected email type ('professional') and cost, but does not significantly enhance understanding beyond the schema.

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 clearly states the tool's purpose: finding a professional email address using first name, last name, and company domain. It distinguishes itself from the sibling 'email-verify' which likely verifies emails rather than finding them.

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 guidance is provided on when to use this tool versus alternatives (e.g., when to use 'email-verify' instead). No context about prerequisites or limitations is given.

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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