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To stop an LLM from leaking API keys in generated code, do not give it real keys to read. Keep credentials out of prompts and assistant-accessible files, have code retrieve them from a controlled runtime secret source, and add scanning and review before changes are committed or merged. Treat any real exposure as a credential incident: revoke or rotate the key and investigate its use.
Why “default to secret” is the right rule
Assume a credential may be exposed if it enters a coding assistant’s readable files, prompt, terminal context, or workflow. The strongest safeguard is preventing access in the first place, rather than asking the model to keep a key confidential.
A prompt is not an authorization boundary or a secret store. OWASP says, “The system prompt should not be considered a secret, nor should it be used as a security control.” OWASP LLM07:2025, System Prompt Leakage recommends treating system prompts accordingly. Restrict access outside the model and do not give an agent credentials it does not need.
Keep real credentials out of the assistant’s context
Do not paste live keys into chat, prompts, terminal sessions visible to the assistant, source files, tests, notebooks, examples, or other project files it can inspect. Use a placeholder such as API_KEY when describing the configuration the code should read.
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Exclude sensitive files—such as .env files, private keys, and credential files—from the coding tool’s context using its exclusion controls. A .gitignore entry prevents Git from tracking a file; it does not prevent a filesystem-reading assistant from opening it. OWASP’s guidance on LLM prompt injection prevention addresses limiting exposure of sensitive information to AI tools.
Have generated code retrieve secrets at runtime
Ask the assistant to write code that reads a named configuration value at runtime rather than embedding a credential literal. Supply the value through a controlled environment variable or a secrets manager integrated with the deployment environment. OWASP’s Secrets Management Cheat Sheet covers secret storage, runtime provisioning, least privilege, rotation, and revocation.
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- Give each workload only the credentials and permissions it needs for its task.
- Keep the secret value out of logs, exception messages, test output, and generated documentation.
- Choose a runtime secret source based on its access controls, rotation and revocation support, audit visibility, deployment integration, and operational complexity.
Review the assistant’s changes before they land
Inspect the full diff, not just the main source file. Check tests, examples, notebooks, logs, and CI configuration for credential literals or accidental forwarding of secret values. For agents with tool or CI access, restrict permissions and require approval before they access sensitive resources or modify workflows.
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Scan locally and block secrets in repository workflows
Use secret detection before commit and as a pull request check, configured to fail when it finds a detection. Local feedback can catch a mistake while it is being made; a pull request gate provides another check before merge. Select checks based on whether they cover the credential types you use, how bypasses are handled and audited, and whether they are available in your repository workflow.
Where available, GitHub push protection can block supported secret patterns at push time. GitHub explains: “With push protection, secret scanning blocks contributors from pushing secrets to a repository and generates an alert whenever a contributor bypasses the block.” See GitHub’s leak-prevention documentation. Push protection and scanners are an additional layer, not a guarantee: they recognize supported patterns and may not detect every credential or exposure route.
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Respond to an exposed key as a credential incident
- Revoke or rotate the exposed key. Removing the line from the current file does not make a credential that was exposed safe.
- Remove the secret from active code and configuration. Replace it with runtime retrieval from an approved secret source.
- Review repository alerts and available access logs. Look for unexpected use and investigate what the credential could access.
- Check related workflow and assistant access. Determine whether the key appeared in prompts, logs, build output, or other assistant-readable locations, and reduce access that was not needed.
OWASP’s secrets-management guidance describes revocation, rotation, and monitoring as parts of the secret lifecycle. The right response is not merely to erase a visible string, but to make the exposed credential unusable and check for signs it was used.
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Build layered controls, not a single promise
There is no single prompt, secret manager, or scanner that eliminates every route by which a key can enter model context or generated output. Keep secrets inaccessible where possible, limit agent permissions, retrieve credentials only at runtime, and use review and scanning to catch mistakes. Official guidance supports this defense-in-depth approach; it does not guarantee that every leak can be prevented.
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