--- title: Secure Third-Party Tool Calling in LlamaIndex Using Auth0 description: LlamaIndex agents can securely call third-party APIs on behalf of authenticated users using Auth0's Token Vault. The tutorial demonstrates building a teacher... canonical: https://daily.dev/posts/secure-third-party-tool-calling-in-llamaindex-using-auth0-mipiryz3l twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Secure Third-Party Tool Calling in LlamaIndex Using Auth0 | daily.dev og:description: LlamaIndex agents can securely call third-party APIs on behalf of authenticated users using Auth0's Token Vault. The tutorial demonstrates building a teacher... og:url: https://daily.dev/posts/secure-third-party-tool-calling-in-llamaindex-using-auth0-mipiryz3l og:image: https://api.daily.dev/og/posts/miPiRYZ3l.png og:image:alt: Secure Third-Party Tool Calling in LlamaIndex Using Auth0 og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Secure Third-Party Tool Calling in LlamaIndex Using Auth0 **[Auth0](https://daily.dev/sources/auth0)** · 13 min read · 1 upvotes · 0 comments ## Summary LlamaIndex agents can securely call third-party APIs on behalf of authenticated users using Auth0's Token Vault. The tutorial demonstrates building a teacher assistant that sends Gmail emails through an LLM agent by configuring Google OAuth with Auth0, enabling Token Exchange for federated connections, and using the Auth0 AI LlamaIndex SDK to fetch scoped access tokens just-in-time. The approach keeps credentials secure by storing refresh tokens in Token Vault and never exposing them to the LLM, while allowing user-level actions that maintain proper identity and audit trails. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [Building Secure AI Agents with Microsoft Agent Framework and Auth0 Token Vault](https://daily.dev/posts/building-secure-ai-agents-with-microsoft-agent-framework-and-auth0-token-vault-ccjnfxrsp) · Auth0 · 2 upvotes · 0 comments - [Handling Third-Party Access Tokens Securely in AI Agents](https://daily.dev/posts/handling-third-party-access-tokens-securely-in-ai-agents-kt5o1ntqs) · Auth0 · 1 upvotes · 0 comments - [AgentFlow: Autonomous AI Agents with Secure OAuth Integration via Auth0 Token Vault](https://daily.dev/posts/agentflow-autonomous-ai-agents-with-secure-oauth-integration-via-auth0-token-vault-5uzsgsm8s) · DEV · 4 upvotes · 0 comments - [I gave my local LLM email access without handing over my entire inbox](https://daily.dev/posts/i-gave-my-local-llm-email-access-without-handing-over-my-entire-inbox-am7x8kzgu) · XDA Developers · 0 upvotes · 0 comments - [LLM Key Server: Providing Secure and Convenient Access to Internal LLM APIs](https://daily.dev/posts/llm-key-server-providing-secure-and-convenient-access-to-internal-llm-apis-bjurovfbl) · Mercari Engineering · 2 upvotes · 0 comments --- Tags: [#python](https://daily.dev/tags/python), [#llm](https://daily.dev/tags/llm), [#oauth](https://daily.dev/tags/oauth), [#auth0](https://daily.dev/tags/auth0), [#llama](https://daily.dev/tags/llama) [View this post on daily.dev](https://daily.dev/posts/secure-third-party-tool-calling-in-llamaindex-using-auth0-mipiryz3l) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"Secure Third-Party Tool Calling in LlamaIndex Using Auth0","url":"https://daily.dev/posts/secure-third-party-tool-calling-in-llamaindex-using-auth0-mipiryz3l","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/secure-third-party-tool-calling-in-llamaindex-using-auth0-mipiryz3l"},"datePublished":"2026-01-21T15:02:21.893Z","dateModified":"2026-01-21T15:02:46.486Z","description":"LlamaIndex agents can securely call third-party APIs on behalf of authenticated users using Auth0's Token Vault. 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