# Agent credentials: issue the smallest useful secret and prove you can revoke it Canonical: https://www.web3sec.news/blog/agent-secrets-scope-and-recovery Author: Raiders (https://www.web3sec.news/about) Format: guide Topic: Agent credentials & recovery Published: 2026-11-08 Updated: 2026-11-08 An operating procedure for task-scoped identities, secret delivery, output review and recovery after unintended access or upload. ## The short answer Give each agent task a narrowly scoped identity and a documented revocation owner. Deliver credentials only to the trusted component that needs them, keep values out of prompts and reports, and avoid secrets in untrusted builds. Test expiration and revocation at the receiving service, including residual sessions and authority created before containment. ### Diagram: Account recovery is part of the authority graph. Review login, sessions, service grants and recovery as connected control paths. ![Account login creates a session, which can grant connected services downstream authority. An independent recovery channel must be separately verified and must not depend entirely on the same compromised account. Session revocation alone may leave downstream grants active.](https://www.web3sec.news/diagrams/identity-recovery.svg) [Full-size SVG](https://www.web3sec.news/diagrams/identity-recovery.svg) · [PNG download](https://www.web3sec.news/diagrams/identity-recovery.png) Original explanatory control model; not a reconstruction of private incident evidence. ## Map the task to a separate identity The service owner should name the exact resources and actions needed for an agent task, then select an identity whose permissions match that scope. Prefer a separate short-lived credential where the provider supports it. Record issuer, audience, expiration, permitted operations, environment and revocation method without copying the value into the inventory. Keep production, research and personal-account credentials separate so a useful test does not inherit unrelated authority. Review indirect privilege as well as explicit scope. A credential that reads a secret store, edits workflow code or changes another account’s recovery details can have greater effective power than its name suggests. Check which environment variables, credential helpers, identity endpoints and mounted files the agent process can use. Keeping a secret out of the prompt does not protect it if the same process can retrieve it freely from the filesystem. ## Deliver secrets through a narrow execution path Use the service’s supported secret or workload-identity mechanism and expose the credential only to the component making the authorized request. Do not paste real values into prompts, repository files, report drafts or broad tool descriptions. OWASP’s secrets-management guidance covers lifecycle, access and auditing. Our operating recommendation is to give the model a nonsecret reference or task result when it does not need the raw credential. For container builds, Docker documents secret mounts rather than build arguments or persistent image environment variables. This reduces persistence through the build mechanism, but does not make a malicious build instruction safe: code receiving a secret can still copy or transmit it. Do not supply valuable credentials while building or testing an untrusted repository. Use dummy credentials or a separately reviewed retrieval stage with limited network and resource access. ## Review output and account actions for exposure Prevent debug mode, command tracing and error handling from dumping authorization headers, full environments or connection strings. Check generated reports, archives, screenshots, task histories and shared links before exporting them. Redaction is a useful layer, but transformed or partially encoded values may evade a simple matcher. Keep logs useful through credential identifiers and request correlation rather than printing the credential to prove which one was used. Monitor the accepting service for unusual operations, destinations and new authority created through the agent identity. A leak may occur through a legitimate API call, attachment or artifact rather than an obvious outbound request to a suspicious host. Keep task and service-side audit records connected so an investigator can distinguish a model proposal from the operation actually completed by the execution tool. ### Diagram: Content is evidence. Approval is authority. Keep source material separate from the authority to act. ![Sources enter a working context and produce a proposal. A separate approval gate checks scope before a tool action. Untrusted content cannot authorize execution.](https://www.web3sec.news/diagrams/trust-boundary.svg) [Full-size SVG](https://www.web3sec.news/diagrams/trust-boundary.svg) · [PNG download](https://www.web3sec.news/diagrams/trust-boundary.png) Original explanatory control model; not a reconstruction of private incident evidence. ## Rehearse expiration, revocation and compromise Use a designated test credential to perform one allowed action, one denied action and a retry after expiration or revocation. Verify the result at the receiving service and check whether refresh tokens, cached sessions or newly issued credentials remain. Then run a synthetic leak drill with a clearly fake secret in a test log, confirming that the right owner receives the event and knows where to disable access. If a real credential is exposed, stop the affected path, preserve restricted evidence and revoke or replace it from a trusted environment. Review actions taken before revocation, including uploads, role changes, new tokens and scheduled work. Remove public artifacts where possible, while assuming copied material cannot be recalled. Resume the task with corrected scope and a tested delivery path; deleting the chat or rotating only the visible key is not sufficient closure evidence. ## Controls to take away - Secret storage and permission scope solve different problems. - A secret mount protects delivery mechanics, not malicious consuming code. - Revocation must address sessions and authority created before containment. ## Work through the boundary Local planning worksheets; they do not inspect or change accounts or environments. - [Build a permission review plan](https://www.web3sec.news/tools/agent-permissions): Select the capabilities you are considering and review approvals, revocation and evidence before connecting an agent. ## Working checklist Assign owners and record supporting evidence in your team's system. - [ ] Assign a task-specific identity and record its revocation owner. - [ ] Inspect indirect access through files, helpers and secret stores. - [ ] Keep real credentials out of prompts, repositories and generated reports. - [ ] Never grant valuable secrets to untrusted build instructions. - [ ] Prove expired/revoked access fails and review residual sessions and authority. ## Common questions ### Is a secret safe just because I never pasted it into the prompt? Not necessarily. The agent process may retrieve it from environment variables, mounted files, credential helpers or a secret store. Review that reachable access and provide only the authority the task needs. ### Does a build-secret mount make an untrusted build safe? No. A mount can reduce secret persistence through the build mechanism, but code that receives the value can still copy or transmit it. Use dummy credentials for untrusted build instructions. ### What should I check after revoking an exposed agent credential? Confirm access fails at the receiving service, then review refresh tokens, cached sessions, newly created credentials, role changes, uploads and scheduled work. Deleting a conversation does not retract completed actions or copied secrets. ## Sources & further reading - [OWASP: secrets management lifecycle and access](https://cheatsheetseries.owasp.org/cheatsheets/Secrets_Management_Cheat_Sheet.html) - [Docker: build secrets and secret mounts](https://docs.docker.com/build/building/secrets/) Incident facts are attributed to the linked reports. Recommendations are Web3Sec's analysis. [Research methodology](https://www.web3sec.news/methodology) · [Editorial policy](https://www.web3sec.news/editorial-policy) · [Send a correction](https://www.web3sec.news/contact)