Merge pull request #159 from tavily-ai/chore/add-human-id-support

Chore/add human id support

Author: pulvedu

README.md

@@ -206,6 +206,29 @@ export DEFAULT_PARAMETERS='{"include_images": true}'
 }
 ```
 
+## Identifying the End User (Optional)
+
+You can optionally identify the end user on whose behalf requests are being made by setting the `TAVILY_HUMAN_ID` environment variable. When set, Tavily MCP forwards it as the `X-Human-Id` header on every API call, enabling per-user analytics.
+
+This is **entirely optional** — leave it unset and behavior is unchanged.
+
+```json
+{
+  "mcpServers": {
+    "tavily-mcp": {
+      "command": "npx",
+      "args": ["-y", "tavily-mcp@latest"],
+      "env": {
+        "TAVILY_API_KEY": "your-api-key-here",
+        "TAVILY_HUMAN_ID": "your-user-id"
+      }
+    }
+  }
+}
+```
+
+**Privacy note:** Tavily hashes `human_id` server-side (SHA-256) before storage, so the raw value is never persisted. Even so, prefer opaque identifiers (e.g. an internal user ID) over raw PII like emails when possible.
+
 ## Acknowledgments ✨
 
 - [Model Context Protocol](https://modelcontextprotocol.io) for the MCP specification

package-lock.json

@@ -1,6 +1,6 @@
 {
   "name": "tavily-mcp",
-  "version": "0.2.18",
+  "version": "0.2.19",
   "mcpName": "io.github.tavily-ai/tavily-mcp",
   "description": "MCP server for advanced web search using Tavily",
   "repository": {

package.json

@@ -4,6 +4,7 @@ import { Server } from "@modelcontextprotocol/sdk/server/index.js";
 import { StdioServerTransport } from "@modelcontextprotocol/sdk/server/stdio.js";
 import {CallToolRequestSchema, ListToolsRequestSchema, Tool} from "@modelcontextprotocol/sdk/types.js";
 import axios from "axios";
+import { randomUUID } from "crypto";
 import dotenv from "dotenv";
 import { McpError, ErrorCode } from "@modelcontextprotocol/sdk/types.js";
 import yargs from 'yargs';
@@ -12,6 +13,8 @@ import { hideBin } from 'yargs/helpers';
 dotenv.config();
 
 const API_KEY = process.env.TAVILY_API_KEY;
+const HUMAN_ID = process.env.TAVILY_HUMAN_ID;
+const SESSION_ID = randomUUID();
 
 
 interface TavilyResponse {
@@ -81,7 +84,7 @@ class TavilyClient {
     this.server = new Server(
       {
         name: "tavily-mcp",
-        version: "0.2.18",
+        version: "0.2.19",
       },
       {
         capabilities: {
@@ -95,7 +98,9 @@ class TavilyClient {
         'accept': 'application/json',
         'content-type': 'application/json',
         'Authorization': `Bearer ${API_KEY}`,
-        'X-Client-Source': 'MCP'
+        'X-Client-Source': 'MCP',
+        'X-Session-Id': SESSION_ID,
+        ...(HUMAN_ID ? { 'X-Human-Id': HUMAN_ID } : {}),
       }
     });