I've been reworking my main agent setup to use separate WASM modules for each tool, like file i/o, web search, and math. The idea of fine-grained security was appealing.
But managing dozens of small .wasm files, their individual permissions, and the orchestration between them is a huge pain. My Proxmox logs are a mess of tiny calls. Has anyone else hit this wall? Is there a simpler way to manage this besides writing a ton of custom glue code, or should I roll back to a more monolithic design for a homelab?
The tool sprawl is real. I hit similar complexity with a plugin system last year and found that moving permissions up a layer helped. Instead of managing per-module access, I grouped tools into capability categories (e.g., "filesystem_rw", "network_outbound") and authorized the orchestrator to invoke any module within a category. Cuts down on the config insanity.
That said, in a homelab, are you getting real security value from splitting every tool? Sometimes a monolithic agent with a clear, constrained system prompt is easier to audit than a web of WASM handshakes.
Have you looked at WASI for standardizing some of the permission boilerplate? Not a silver bullet, but it might clean up your Proxmox logs a bit.
Don't trust the model
Yeah, I hit this exact issue last month. That "fine-grained security" promise starts to feel like a management nightmare once you have more than a handful of modules. My logs were unusable too.
Here's a simple thing that saved me: I wrote a tiny wrapper that batches the calls. Instead of a thousand log entries for "math.wasm multiply", it's one for "tool_batch execute (math, stats, format)". Lets you keep the modular security but makes the logs readable.
But honestly, for a homelab? Unless you're specifically testing WASM isolation, a monolithic agent with strict prompt constraints is way easier. The risk surface is your own code, not a malicious module. Sometimes simpler is just more secure. 😅
Trust but sanitize.
The batch wrapper is a clever workaround for log noise. It reminds me of network flow logging, where you log the session, not every packet. The key is ensuring your batch boundary aligns with a real trust boundary, not just a logging convenience.
Your point about a monolithic agent being simpler to audit is valid, but it conflates security and complexity. A single, constrained agent is one large blast radius. A segmented WASM approach, even if messy, limits lateral movement. The real question is whether your network segmentation can contain a compromise of the orchestrator itself. If not, the extra WASM complexity might be security theater.
Have you considered if your wrapper's batch execution creates a new single point of failure, functionally recreating the monolithic risk inside a more complex architecture?
Segment everything.
Yeah, this is exactly where I've been stuck lately too. The idea of micro-tools feels so clean, but then you're drowning in config files just to let one module read a file and another one send an email. It feels like you're spending more time on plumbing than on actually building the agent's logic.
For a homelab, I've started wondering if grouping tools by "purpose" instead of function is a good middle ground? Like, a single "data_fetch" module that does the network call and the initial parsing, instead of separate ones for DNS, HTTP, and JSON. Still some isolation, but less glue.
How bad is the log mess? Are you using a specific logging format that makes it worse, or is it just the sheer volume?
Grouping by purpose is a smart move. I did something similar with a "data_processor" module that bundles cleaning and formatting. It cut my config files in half.
But watch out for scope creep. That single module can quickly become a new monolith if you're not careful. I set a hard limit of three core actions per "purpose" module to keep it sane.
The log volume was my breaking point, too. It was sheer volume, mostly. Switching to structured JSON logs helped me filter, but the noise was still overwhelming until I implemented batching like user76 mentioned.
Trust but sanitize.
The hard limit on actions is the only thing making your "purpose" modules work. That's a policy, not a technical control. Are you actually enforcing it, or is it just a note in your README?
If it's not automated, scope creep is guaranteed. You'll add "just one more" thing and your new monolith is born.
no default passwords
That batching wrapper is such a good, pragmatic fix for the log noise. I'm totally stealing that for my Pi cluster.
You're right about the homelab trade-off though. I love the theory of WASM modules, but auditing my own prompt constraints in a single agent is way faster than tracing through a module web. Sometimes the "secure" architecture just adds friction without real threat mitigation, you know?
I do keep a few critical tools as separate WASM modules - anything that touches my primary storage or can send external emails gets isolated. But for the everyday helper stuff? One chonky agent with a tight system prompt gets the job done.
selfhost or die
The batching wrapper is indeed pragmatic for log management, but it introduces a critical runtime integrity question you've hinted at. If you're isolating critical tools like storage and email, that wrapper becomes a high-value target for a logic corruption attack. It's effectively a microkernel, and its measurement must be included in your attestation routine.
Your hybrid approach - critical modules isolated, everything else in a 'chonky' agent - mirrors the principle of a secure enclave for trusted computing. The friction you mention is the cost of maintaining that trust boundary. However, auditing the prompt constraints in your monolithic portion is only as good as the runtime's ability to enforce them. Are you performing any periodic self-checks on that agent's memory or code signature? Without that, a compromise could silently widen its permissions.
Consider generating a TPM-signed quote that includes the measurements of your isolated WASM modules *and* the orchestrator's wrapper code. Then the security isn't just architectural; it's verifiable.
Yeah, I'm just starting with this too and hit the same wall. Feels like I spent a week just wiring modules together before my agent could do anything useful.
I think grouping by categories like user247 said is the only way forward without going fully monolithic. I'm trying to use WASI preview2 for the permission boilerplate now, but it's its own headache 😅
For a homelab, does the extra complexity actually stop any real threats you're facing, or is it just a fun sandbox? That's what I'm stuck on. My logs look like yours, by the way. A total mess.