An Operational Governance Checklist for AI API Credentials

Credential governance fails when it exists only as a policy sentence: “API keys must be stored securely and rotated regularly.” That statement does not identify the keys, their owners, their authority, the systems that depend on them, or the action an operator takes during an incident.

For AI API access, governance should be an operating system. It should produce evidence that credentials are intentionally issued, narrowly distributed, observable, replaceable, and revocable.

1. Inventory every credential boundary

Maintain an inventory of provider credentials, proxy credentials, workload identities, and emergency access paths. For each item, record non-secret metadata:

• issuing system and credential type;
• provider account, project, or trust zone;
• workload and environment;
• accountable owner and backup owner;
• authority or provider permissions;
• applicable call, token, spend, time, IP, or rate controls;
• approved storage and delivery mechanism;
• creation, last-use, last-review, and planned-expiry dates;
• dependent services and revocation impact.

Do not put the secret itself in the inventory. Store only an identifier or safe prefix that operators can map to the issuing system.

NIST's SP 800-57 Part 1 Rev. 5 is written for cryptographic key management, but its attention to protection requirements, inventory, lifecycle functions, compromise, and policy is a valuable model for machine credentials more broadly.

2. Make issuance a decision, not a copy operation

Before issuing a credential, require a workload, owner, environment, and expected duration. Decide whether the workload can use provider-native temporary identity instead. If it needs a bearer key, choose the smallest provider authority and the narrowest operational boundary available.

For Till, that means keeping provider connections separated by tenant and issuing distinct scoped tokens to workloads. Each token requires an activation ceiling and can add token, spend, expiry, and IP controls. The provider connection remains subject to the provider's projects, roles, restrictions, billing controls, and monitoring.

The approval record should explain why the limits fit the workload. “Default” is not a risk decision.

3. Standardize storage and delivery

The OWASP Secrets Management Cheat Sheet recommends centralized management and treats creation, rotation, revocation, and expiration as distinct lifecycle stages. Translate that into an approved path:

• return a complete credential only once;
• deliver it through a protected channel or directly into a secret store;
• restrict who and what can read it;
• redact it from application and infrastructure logs;
• keep it out of source, ticketing systems, chat, and documentation;
• back up the secret-management system according to its recovery model;
• test restoration without exposing plaintext in evidence.

Encryption at rest is one control. Access to the runtime, decryption keys, backups, and administrative plane also belongs in the threat model.

4. Monitor use at both layers

A proxy can provide per-workload status and enforce local bounds. The provider remains authoritative for upstream usage and billing. Monitor both.

Useful signals include:

• a workload using a new provider or route;
• source addresses outside the expected network;
• sudden changes in request volume, model choice, tokens, or cost;
• repeated local rejections or exhausted limits;
• provider usage that cannot be reconciled to known workloads;
• use of a credential scheduled for retirement;
• attempted use after revocation.

Keep enough metadata to investigate without collecting prompts and responses by default. Credential governance should not become a reason to build an unnecessary store of customer content.

5. Test rotation and revocation separately

Rotation is a planned replacement. Revocation is an authorization decision that may be urgent. A system that can rotate monthly but cannot stop one compromised workload immediately is incomplete.

For each credential class, document and exercise:

1. who can authorize the action;
2. how the replacement or revocation is performed;
3. which consumers are affected;
4. how success is verified at the proxy and provider;
5. how rollback works without reactivating a compromised secret;
6. what evidence is retained.

The exercise should include a failed consumer, a stale deployment, and unexpected post-revocation traffic. Those are the cases that expose gaps in inventories and ownership.

6. Prevent repository leaks and respond correctly

GitHub documents secret scanning as scanning Git history for supported hardcoded credentials and generating alerts when a leak is detected. For a genuine alert, rotate or revoke the credential immediately according to the issuer's guidance, then investigate use and remove the secret from files and artifacts.

Editing the latest commit is cleanup, not containment. Copies may remain in history, clones, caches, logs, or an attacker's possession. The issuing system must make the exposed value unusable.

7. Review evidence on a fixed cadence

A quarterly or monthly review should produce decisions, not just acknowledgements:

• remove unused credentials;
• reassign credentials whose owner left or changed roles;
• split shared credentials across unrelated workloads;
• reduce limits that exceed observed need;
• verify provider permissions and billing controls;
• close gaps found in rotation or incident exercises;
• update the inventory after architecture changes;
• record accepted exceptions with an owner and expiration date.

Track a small set of meaningful measures: inventory coverage, credentials without owners, unused credentials removed, time to revoke after an alert, overdue reviews, shared credentials remaining, and lifecycle exercises completed successfully.

Good governance is visible in operations. An operator can identify a credential, explain why it exists, see how it is bounded, revoke it without guessing, and verify the result. That evidence is more valuable than a sweeping claim that all API keys are “managed securely.”

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