Building agents without harness engineering(rajitkhanna.com) |
Building agents without harness engineering(rajitkhanna.com) |
If a startup has a specific flow they want the agent to take and their traffic is bursty, then I'd recommend using a framework like Mastra and deploying onto a sandbox.
For long-running always on agents where it's important to learn the users preferences overtime, our approach is the highest ROI.
We’re using Claude agent sdk right now to rollout an internal agent factory. We haven’t hit the memory issue yet but I do use Hermes as a personal agent and can see where it fits you.
1. Our approach has cron-based or trigger-based automations built-in. Building automations with claude agent sdk requires setting up separate infrastructure.
2. Our approach has self-learning built-in. Building a feature like "dreaming" https://docs.openclaw.ai/concepts/dreaming with claude agent sdk also requires setting up separate infrastructure.
3. Our approach decouples the harness and the compute, which lets developers enforce a stricter security boundary, while claude agent sdk ships with the harness, shell, and filesystem in one process https://platform.claude.com/cookbook/claude-agent-sdk-07-hos....
4. Our approach does not vendor lock developers.
You could pick the latest harness and then switch when another better one rolls out. Our bet is that a developer's time is better spent speaking to their customers than switching harnesses.
Cost is the token usage and container uptime.
> One Docker container per-customer sounds like it would be really expensive.
The advantage is per-user memory and self-learning. For context, Claude Managed Agents uses one sandbox per session: https://platform.claude.com/docs/en/managed-agents/environme....
> Are they started on-demand, or run 24/7?
24/7 (best for customer-facing chat products).
> What keeps users from using the agents for general purpose tasks, protects against prompt-injection, etc?
Users define their agent with a system prompt, tool definitions, and skills (which separate a media generation agent from a people search agent). We use Openrouter which has a prompt injection detection feature: https://openrouter.ai/docs/guides/features/guardrails/prompt....
> It is highly unlikely that an AI agent startup becomes wealthy by creating the best harness for a particular use case.
If it's not the harness, what do you think is the thing that will differentiate AI agent startups? Is it mainly data, or something else?
Even as the cost of writing code goes to zero, those two pieces of information are non-commodities.
By providing Hermes with a system prompt, custom tools, and skills, developers get the agent loop, session management, automations, sandboxed deployment, and self-learning for free.
We are closer to infrastructure than a library or framework; we give developers a live agent they can chat with in a single API call.