Agent Access Entitlement Runtime Re-Validation
Added October 2026
Re-check an agent's access entitlements against current policy at the moment it requests a resource, not only when it was last deployed or reviewed. A revoked or narrowed entitlement takes effect on the agent's next request, not at the next release cycle.
Objective
Close the gap between when an access change is approved and when it actually stops an agent, so a revoked entitlement cannot keep working for days or weeks because the agent was never redeployed.
Maturity Levels
Initial
Agent entitlements are set at deployment and checked again only when the agent is next redeployed or reviewed. A revoked entitlement stays in effect until that happens.
Developing
Some agents re-check a cached copy of their entitlements periodically, but the cache can be hours old and revocations are not guaranteed to propagate before the next request.
Defined
Every resource or data request an agent makes is checked against the current policy at request time, not a cached copy. Revocation takes effect on the agent's very next request.
Managed
Re-validation latency is measured and reported. Entitlement changes are tested end to end, confirming the time between a revocation and an agent actually being blocked, and that time is tracked against a target.
Optimizing
Re-validation is a shared platform service used by every agent, not built per team. Entitlement decisions are logged per request and feed anomaly detection when an agent's access pattern changes.
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Evidence Requirements
What an auditor or assessor would expect to see for this control.
- —Architecture documentation showing where entitlement checks happen in the request path and confirming they query the current policy source, not a cached token or session claim
- —Measured re-validation latency between an entitlement revocation and an agent's next request being blocked, against a stated target
- —Fail-closed test results showing agent requests are denied, not served from cache, when the policy source is unreachable
- —Sample revocation test records for both human-initiated and automatic (ownership change, risk-tier downgrade, connector removal) triggers
- —Request-level logs showing entitlement decisions, sufficient to reconstruct what an agent was and was not allowed to do at a given moment
Implementation Notes
The gap this closes
Static least-privilege design (AGT-001) sets what an agent should be allowed to do. OAuth scope drift detection (AGT-015) notices when an agent's actual OAuth grants have quietly grown wider than intended. Neither one re-checks a specific entitlement at the moment an agent tries to use it. In practice that means a security team can revoke an agent's access to a sensitive database, mark the ticket closed, and the agent keeps reading that database for as long as its current session or deployment lasts, because nothing forced a fresh check. The incidents behind this pattern are not exotic: an offboarded vendor integration kept pulling data for days, a contractor's agent retained file access a week after the contract ended, and a compromised agent credential was revoked in the identity system but kept working against a downstream API that cached the old grant.
Where this fits next to AGT-028 and AGT-030
AGT-028 governs which external destinations an agent may contact at all; this control governs whether an agent's access to a resource it is already allowed to reach is still valid right now. AGT-030 inventories and baselines MCP servers as connectors; this control is about the entitlement check that happens on every call through those connectors, not the connector's existence or configuration.
What to re-validate, and when
- At every resource or data request, not on a timer: check the agent's current entitlement against the authoritative policy source before serving the request.
- Treat the policy source as the source of truth, not a token or session claim issued earlier. A JWT or session that was valid at issuance can now be stale.
- Target a re-validation latency, for example under 60 seconds between a revocation being saved and an agent's next request being blocked. Measure it, don't assume it.
- Fail closed. If the policy source is unreachable, deny the request rather than falling back to a cached "last known good" entitlement.
- Cover both human-initiated revocations (an admin removes an agent's access) and automatic ones (an agent's risk tier is downgraded, its owner is reassigned under AGT-027, or its MCP connector is pulled from the approved list under AGT-030).
Where it has to live
This cannot be enforced by convention or documentation alone; it needs to sit in the access-control layer the agent's requests actually pass through (an API gateway, a data-access broker, or the MCP server itself), the same way AGT-002's injection defenses have to sit in the request path rather than the system prompt.
Example Implementation
Insurer whose claims-triage agent reads policyholder records through an internal data-access broker
Entitlement Re-Validation Test: claims-triage-agent
| Scenario | Action | Time to block | Result |
|---|---|---|---|
| Owner revokes access to a closed claims dataset | Revoked in policy source at 14:02:10 | 14:02:41 (31s) | Pass, next request denied |
| Agent's risk tier downgraded after an anomaly alert | Tier changed at 09:15:00 | 09:15:52 (52s) | Pass, within 60s target |
| Policy source unreachable (simulated outage) | Request made during outage | N/A | Pass, request denied, not served from last-known-good cache |
Finding: a legacy integration path bypassed the broker and read records directly via a cached service account. That path was deprecated the same week; all data access now routes through the broker so re-validation cannot be skipped.