Protect the key. Check the output.
A practical review of credentials, prompts, logs, tools, and permissions before an integration handles sensitive information.
Draw the credential boundary
Keep real tokens out of static pages, client-side bundles, repositories, screenshots, and public notebooks. Read credentials in an appropriately trusted local or server-side environment. Obfuscating browser code does not prevent the browser's operator from reading it.
Choose narrow permissions for the actual task and separate development credentials from production where practical. The Hugging Face token documentation describes available token roles and fine-grained controls. Verify the permissions needed by your chosen route instead of assuming a token that works elsewhere is suitable.
Review what leaves the application
Prompt minimization
Send only what the task needs. Use synthetic or approved fixtures during development. A large context window is not a reason to include unrelated private material.
Provider processing
Review the specific processing route, retention terms, access controls, and regional requirements. A familiar model name does not establish where or under what conditions a request is processed.
Fallbacks
Keep backup providers inside the same data-handling review. A retry or fallback must not silently send sensitive information to an unapproved route.
Treat logs and caches as data stores
Redact authorization headers and avoid full-prompt logging by default. Inspect error traces and debugging output as well as the successful path. Record request identifiers, status, timing, and selected configuration when those fields are sufficient for diagnosis.
Define cache ownership, authorization scope, and invalidation. A response derived from private documents should not become reusable by another user simply because a short cache key happens to match. Test permission changes and deletion paths alongside cache hits.
Keep generated content untrusted
Validate structure and meaning before writing a result to an authoritative system. A JSON object can be syntactically correct while containing an unsupported claim, wrong unit, or an action the requester is not permitted to take.
For tools, enforce permissions in application code. Allowlist operations and bound their arguments when appropriate. Keep approval rules outside the model's ability to waive them with text. Run generated code in isolation without unnecessary secrets, file access, or network permissions.
Prepare to revoke and replace
Record the owner and intended use of each credential. Write down the replacement process before an exposure occurs. Removing a token from a visible file does not make it secret again; revoke the exposed credential and review available usage information.
Test replacement with a nonproduction token. Confirm that dependent services fail in a controlled manner and that diagnostic output does not expose the new credential. Keep a clear owner for the incident and for any unresolved follow-up.
Use the downloadable checklist
The Markdown checklist covers token location, scope, prompt minimization, log hygiene, cache boundaries, output validation, tool permissions, and revocation. Mark a control complete only after testing it in the relevant environment. It is a practical worksheet, not an independent audit or security certification.
Read the token security article for detailed reasoning, and the reliability guide for failure-handling rules. Security and reliability support each other when uncertain outcomes remain visible and authority stays explicitly bounded.
Download security checklist