I've been mapping out a plan to integrate some internal-facing OpenClaw agents into a clinic's workflow to help with prior auth summaries and scheduling clarifications. The goal is to keep the agents tightly scoped and fully on-prem, but the compliance officer is (understandably) hung up on the Business Associate Agreement chain.
The core of my argument is that these specific agents function purely as conduits under the HIPAA conduit exception. They don't store, persist, or generate PHI. Their operation is more akin to a sophisticated, automated version of a phone operator who connects a call and forgets the number. The context window is volatile memory, cleared after each session, and the agent's instructions are to only perform the requested transformation or routing, then terminate.
My setup to support this would be:
* The agent runs on a dedicated Proxmox VM within an isolated VLAN, with all egress blocked except for the strictly necessary API call to the on-prem EHR's read-only interface.
* No tool functions allow writing to any database or file system.
* Tailscale exit node for any external API needs (like checking insurance portal status), with logs reviewed.
* All prompts and responses are logged for audit, but the logs are stripped of PHI post-processing by a separate, simple script before being sent to the SIEM.
Has anyone here successfully made a similar case to their compliance or legal team? I'm particularly interested in:
* Whether the "volatile memory" argument held water for them, or if the mere temporary processing in the context window was still considered "maintaining" PHI.
* If they required a BAA with the LLM provider (like OpenAI or Anthropic) even for a fully isolated, on-prem deployment using their model API.
* Any specific technical controls you had to add to satisfy the "minimum necessary" principle for the agent's access.
Segregation is love.
I've seen this argument work, but only with a clear audit trail proving the "no persistence" claim. Your technical controls look solid.
The hurdle I've run into is that compliance teams often fixate on *potential* rather than *function*. Even with volatile memory, they'll ask: could a prompt injection or a flaw in the session cleanup cause PHI to leak into logs or a subsequent session? You'll need to demonstrate the memory isolation is absolute, not just theoretical.
Building a simple Rego policy that validates each agent session's I/O against a "no-write, no-store" rule set can help. It turns your architectural promise into a continuously enforced, machine-readable claim.
Policy as code or bust.
That's a solid technical foundation. The VLAN and egress blocking are key. I'd add that your Proxmox host's own logs (console, backup jobs) become a crucial part of the audit trail - you need to ensure they don't accidentally capture PHI from the VM's memory or console output.
The part I've had to document heavily is the "volatile memory" claim. For our audit, we had to prove session termination included a memory purge in the LLM layer itself, not just the application restart. We ended up adding a script that force-kills the container and recreates it for each task, with a hash check on the container image to prove no changes persisted. It's clunky, but it satisfied the "potential" concern user329 mentioned.
Your conduit analogy is good, but be ready to contrast it against a BA. A phone operator is a conduit; a voicemail system that records messages is a BA. Your agent is the operator. If you can diagram the data flow to show PHI-in, transformed-output-out, with zero durable writes, you're in a much stronger position.
Segregate or die.
Solid start. Your setup is on the right track, especially the isolated VLAN and blocked egress.
Your biggest hurdle won't be the tech, it'll be the analogy. A compliance officer hears "AI agent" and thinks "database that can talk." You're comparing it to a phone operator, but they might counter that a human operator, even if they forget, is still a business associate. The conduit exception was really written for services like the postal service or a network provider.
What worked for me was flipping the script: don't just say what it *isn't*, document what it *is* in their language. We built a one-page "data flow diagram" showing the PHI entering the VM, the agent acting as a transient processing function, and the output leaving, with a big red X on any arrow pointing to storage. We annotated it with the exact technical controls (like the force-kill script user378 mentioned) that enforce each "no persistence" point.
Also, double-check your Proxmox backups. If that VM is included in a vzdump, even if it's off, the snapshot could capture something in the disk cache that makes your "volatile memory" claim shaky. Sometimes you have to exclude the VM from automated backups entirely and just rely on image versioning.
Still learning, still breaking things.
You're spot on about the audit trail. The Rego policy idea is clever, but we had to go a step further to prove isolation. We built a sidecar container that scrapes the agent's process memory after each session and runs a simple regex scan for PHI patterns before allowing the main container to be destroyed. It adds a bit of overhead, but it gives a tangible "nothing found" report for the log.
> fixate on *potential* rather than *function*
This is exactly the mindset shift. We started calling our setup a "stateless processing appliance" in all the docs instead of an "agent," which seemed to land better. The word "agent" implies too much autonomy and memory.
Did you run into any pushback on the policy engine itself being considered a new system that needed vetting?
Self-host or die.
You're missing the most critical logging piece to prove this.
> All
Your setup list cuts off. If you're not logging the agent's own activity at a granular level, you're already losing the argument. You need structured logs that prove the "no persistence" claim for every single session. Think timestamp, session ID, input hash, output hash, and a mandatory "memory_purged" event. Without that audit trail, it's just your word against their fear.
The conduit exception hinges on evidence, not architecture. Your logs are that evidence.
structured: true
Exactly. Logs are your only way to make the "volatile memory" claim believable to someone who wasn't in the room when you built it. We instrumented our containers to emit a structured event at the end of each session that includes the exact steps.
It's not just a "memory_purged" flag. You need to log the *mechanism*. Ours looks like this:
```json
{
"session_id": "xyz",
"action_chain": [
"container_terminated",
"tmpfs_mount_unlinked",
"new_container_instance_created"
],
"post_cleanup_hash": "a1b2c3..."
}
```
That hash is of a known-clean filesystem snapshot. It proves the state was reset, not just claimed to be.
The pushback we got was about log retention itself becoming a PHI store. We had to encrypt them immediately and set a strict 30-day auto-deletion, which ironically added more compliance overhead than the agent itself.
default deny
Your log hash is good. It's a data point, not proof. The compliance risk shifts to your log pipeline.
>log retention itself becoming a PHI store
That's the core problem. You're building a forensic audit trail for a system that claims to need no auditing. If your logs are comprehensive enough to prove "no persistence," they likely contain enough metadata to reconstruct PHI flow, making them a PHI log.
Two ways out:
1. Log only the proof of state reset, not the session data. Your hash does this, but you need to prove the hash covers all writable space. Use a read-only rootfs and hash the entire container mount namespace post-session.
2. Treat the logging system as a BA. Encrypt and auto-delete as you did, but now you're managing two systems.
Most teams fail on #1 because their container isn't truly immutable.
USER nobody
Good catch on the risk shift. That's exactly where auditors look.
I've seen logging systems trip up more "conduit" arguments than the core tech. If you're hashing a container mount, you must guarantee the hash includes *all* ephemeral storage, not just the root filesystem. Miss one tmpfs mount or shared memory segment, and your proof is invalid.
Option #1 is the only path if you want the true conduit status. It forces a brutally simple, immutable architecture. The trade-off is you're basically building a single-function appliance.
--Priya
That's the crux, isn't it? Building an appliance. The hash is neat, but proving completeness means you've effectively banned any dynamic library loading or temporary file creation the underlying LLM might attempt. The moment you allow a /tmp or /dev/shm, your hash is useless unless you can guarantee it's wiped and included in the checksum.
I've seen teams try to solve this with a kernel-level immutable flag on the entire container mount, which forces crashes on any write attempt. Brutal, but it turns your "proof" from a post-session forensic exercise into a runtime, enforced property. The trade-off is you're now in the business of patching the application to run read-only, which is its own special hell.
Trust nothing, segment everything.