An offboarded contractor’s Claude skill still runs nightly, pulling data from internal APIs with a token that never expired.
That lingering agent is a textbook case of agent sprawl: dozens of autonomous Claude “skills” execute code on behalf of the organization, each armed with credentials that were granted for a specific purpose but never reclaimed. When a skill is duplicated, repurposed, or simply forgotten, the original permissions persist, giving the code unrestricted access to databases, internal services, and even other agents. The result is a widening attack surface that can be exploited by an insider, a compromised CI pipeline, or a malicious third‑party model.
Most teams already rely on an identity provider to issue OIDC tokens or service‑account keys for their Claude integrations. They configure those tokens with the least‑privilege scopes required for a single skill, and they trust the token’s expiration to limit exposure. Yet the token is presented directly to the target service, and the service sees only the caller’s identity. There is no gate that can inspect the actual request, enforce a policy, or keep a record of what the skill asked for.
What an effective defense needs is a single enforcement point that sits on the path between the Claude skill and the infrastructure it talks to. That point must be able to verify the caller’s identity, decide whether the request matches an approved intent, mask any sensitive fields in the response, and capture a replayable log of the entire session. It must also support just‑in‑time approval for high‑risk operations, so that a human can intervene before a dangerous command reaches the backend.
Why agent sprawl matters for Claude Skills
Claude skills often run in automated pipelines, trigger on schedule, or respond to external events. Because they execute without human supervision, any over‑privileged credential becomes a persistent foothold. The following consequences illustrate the risk:
- Data exfiltration: an over‑scoped token can read entire customer tables and send them to an external endpoint.
- Lateral movement: a skill that can launch SSH sessions may hop to other hosts and compromise additional services.
- Compliance gaps: auditors cannot verify who accessed which resource when the skill operates silently.
- Supply‑chain contamination: a compromised skill can inject malicious payloads into downstream builds.
These outcomes share a common root cause: the lack of a controllable, observable boundary around the skill’s network traffic.
A gateway approach to control agent sprawl
hoop.dev implements the required data‑path control. It sits between the Claude runtime and the target infrastructure, acting as an identity‑aware proxy for every request. The gateway validates the OIDC token presented by the skill, maps the token’s groups to a policy, and then decides whether to allow, mask, or require approval for the operation.
Because hoop.dev is the only component that sees the cleartext request, it can enforce the following outcomes:
- hoop.dev records each Claude session, producing a replayable audit trail that satisfies auditors.
- hoop.dev masks sensitive fields such as credit‑card numbers or personal identifiers in real time, preventing accidental leakage.
- hoop.dev blocks commands that match a deny list, stopping destructive actions before they reach the database.
- hoop.dev routes high‑risk queries to a human approver, enabling just‑in‑time consent.
- hoop.dev isolates credentials from the skill, so the skill never sees the underlying secret.
Deploying hoop.dev requires only a network‑resident agent near the target service and a configuration that registers the Claude skill as a connection. The agent holds the service credentials, while the skill authenticates to hoop.dev with its OIDC token. This separation satisfies the setup requirement, identity is managed by your IdP, but moves enforcement to the data path, where hoop.dev can reliably apply policies.
For a quick start, follow the getting started guide. The learn section provides deeper insight into masking, approval workflows, and session replay.
Practical steps to reduce agent sprawl
- Catalog every Claude skill and the credentials it uses. Tag each skill with the business intent it fulfills.
- Replace long‑lived static tokens with short‑lived OIDC tokens issued per execution.
- Route all skill traffic through hoop.dev, ensuring every request is inspected.
- Define deny lists for destructive commands and configure real‑time masking for sensitive fields.
- Enable just‑in‑time approval for any operation that writes or deletes data.
- Regularly review session logs from hoop.dev to detect anomalous behavior.
FAQ
Does hoop.dev require changes to existing Claude code?
No. Skills continue to use their standard HTTP or gRPC client libraries. The only change is the endpoint address, which now points to the hoop.dev gateway.
Can hoop.dev work with multiple identity providers?
Yes. hoop.dev acts as a relying party for any OIDC or SAML provider, so you can keep your existing IdP configuration.
What happens if the gateway itself is compromised?
hoop.dev stores credentials in memory only and never writes them to disk. Even if an attacker gains control of the gateway process, they cannot extract the underlying service secrets because the agent supplies them on demand.
Ready to tighten control over your Claude skills? Explore the open‑source repository on GitHub and start building a safer agent ecosystem.
