AI-Native & Agentic Infrastructure
TL;DR
Your AI agents are only as reliable as the infrastructure they run on. If your agentic workflows miss a tool call because the runtime dropped state, or your cost tracking does not distinguish between a failed agent loop and a successful one, your product is not ready for production. We build the infrastructure layer that agentic workflows require — the runtime, the observability, and the guardrails — because we run agentic workloads in production ourselves.
The Problem
You have built, or are building, a product where AI agents make decisions, call tools, chain reasoning steps, and produce outputs that your users depend on. Your proof of concept worked. But between the demo and production lies a gap that most teams underestimate: agentic workflows are stateful, non-deterministic, and expensive in ways that stateless API calls are not.
Your current infrastructure was designed for request-response services, not for long-running agent loops that may span dozens of LLM calls, each with its own tool invocation, retry, and cost. Your observability stack does not trace across agent steps. Your cost tracking buckets everything under "AI API calls" without surfacing which agent is burning budget on hallucinated tool invocations. Your engineers are writing agent logic but no one is engineering the platform those agents run on.
Agentic infrastructure is a distinct engineering discipline. It requires understanding both the LLM behavior patterns and the distributed systems principles that keep the runtime reliable. The infrastructure decisions you make now — how state is persisted across agent steps, how tool calls are authorized, how agent outputs are validated — will determine whether your platform scales past ten concurrent users.
Why This Is Hard
Agentic workflows break the assumptions of standard application infrastructure. A single user request may trigger an agent that makes twelve LLM calls across three different models, invokes four internal APIs, queries a vector database, and runs a code interpreter — all before returning a response. Each of those steps can fail independently. Each failure mode has different recovery semantics. A tool timeout is not the same as a model hallucination is not the same as an authorization failure, and your infrastructure needs to distinguish between them.
The tooling ecosystem for agentic infrastructure is nascent. LangChain, CrewAI, and similar frameworks handle the orchestration layer, but they do not solve the infrastructure problems: durable execution state, cross-step observability, per-agent cost attribution, tool authorization at the infrastructure level, and guardrails that operate independently of the agent's own reasoning. These are platform engineering problems, and they require platform engineering answers.
| Layer | Concern | Production Requirement |
|---|---|---|
| Runtime | State management, step durability, concurrency control | Durable execution that survives process restarts. At-least-once semantics with idempotency keys. |
| Observability | Cross-step tracing, cost attribution, latency profiling | Each agent step emits structured telemetry. Cost is attributed per agent invocation, not per API call. |
| Tool Gateway | Authorization, rate limiting, input validation | Every tool call is authorized at the infrastructure layer. No agent can invoke a tool without explicit permission. |
| Guardrails | Output validation, PII detection, content safety | Guardrails run out-of-band from agent reasoning. A hallucinating agent cannot disable its own guardrail. |
| Model Router | Provider failover, cost optimization, latency tiering | Requests route to the appropriate model based on task criticality. Provider outages degrade gracefully. |
Operating principle: The person who scopes the problem is the person who writes the code and stays until it is running. No junior bench. No handoffs.
How Mihok Fieldwork Approaches It
We are not an AI consultancy that writes agent prompts. We are infrastructure engineers who build the platform that agents run on. We have built and deployed agentic infrastructure in production, and we understand what it takes to move from a notebook demo to a system that handles concurrent agent sessions without dropping state or silently exceeding cost budgets.
Our agentic infrastructure work covers:
- Durable agent runtime. Agent state persists across steps so a process restart does not lose a partial workflow. Idempotency at every tool boundary so retries do not double-execute.
- Structured observability. Cross-step tracing with per-agent cost attribution. You can answer: which agent variant is most expensive per successful task? Which tool call has the highest failure rate?
- Tool authorization gateway. Every tool an agent can invoke is explicitly authorized at the infrastructure layer, with per-agent scoping and rate limits. If an agent hallucinates a tool call it was never granted, the gateway rejects it before execution.
- Independent guardrails. Output validation and safety checks run outside the agent's own reasoning loop. A guardrail cannot be reasoned around or ignored because it operates at the infrastructure boundary, not in the prompt.
- Model routing and cost control. Intelligent routing across model providers with cost tiering. Non-critical agent steps use cheaper models automatically. Provider failover prevents single-vendor lock-in.
Proof
An AI-native startup building autonomous tool-use agents came to us with a specific constraint. Their agents needed governed access to over forty internal APIs — customer data, billing, shipping, inventory, the whole surface area of their business — without a single hardcoded credential in the agent configuration. Every tool call had to be auditable, attributable, and revocable per invocation. And the team had been told the gateway layer could not add more than 200 milliseconds of latency to any request. This was not an architecture diagram. It was a Tuesday afternoon.
We built a tool authorization gateway that issued short-lived scoped tokens per agent invocation. No persistent credentials. No broad access. When an agent made a tool call, the gateway minted a token scoped to exactly that call, validated it against the agent's capability profile, and expired it immediately after execution. On top of that we layered structured telemetry that tagged every tool invocation with the agent ID and workflow ID that triggered it, so a single user request could be traced through every downstream API call the agent made and back. The reconciliation layer mapped those same attribution tags into a cost ledger that let finance answer the question every AI startup eventually asks: what did that specific agent session actually cost us?
Within three months the platform was handling concurrent agent sessions across four separate workflows, with every tool invocation logged, attributed, and revocable. The real test arrived unannounced. A misconfigured agent in a test environment attempted an out-of-scope API call to a production billing endpoint. The gateway rejected it before execution. The platform owner knew within thirty seconds which agent, which workflow, and which policy rule had fired. Not a Slack alert buried in a channel nobody reads — a precise attribution trace that took the team straight to the offending configuration.
This is the kind of infrastructure that sounds straightforward in an architecture diagram and reveals its complexity the moment you try to attribute a single rejected tool call back to the agent that initiated a workflow three steps earlier. The diagram shows a box labeled "Auth Gateway." The production system has to know that agent A-7, running workflow W-3 at step four, invoked a tool it was granted at step two but whose scope expired after step three, and the rejection reason is not "unauthorized" in general but specifically "scope expired for this agent at this step in this workflow." Diagrams do not surface that. Running infrastructure does.
Operating principle: Infrastructure that rejects a tool call is only as useful as the attribution trail that tells you why. Every rejection must surface the agent, the workflow, the step, and the policy rule. Thirty seconds to root cause. No grep required.
What is agentic infrastructure?
Agentic infrastructure is the platform layer that AI agents run on — the runtime that manages agent state across steps, the observability that traces multi-step reasoning chains, the authorization layer that controls which tools each agent can invoke, and the guardrails that enforce safety boundaries independently of the agent's own reasoning.
How is this different from a standard AI API integration?
A standard AI API integration sends a prompt and receives a response. Agentic workflows send a prompt, receive a response, execute a tool, feed the result back into another prompt, execute another tool, and so on across potentially dozens of steps. This creates state management, observability, authorization, and cost attribution problems that simple API wrappers do not address.
What model providers do you work with?
We build infrastructure that is provider-agnostic. Our routing layer works with OpenAI, Anthropic, Google, and self-hosted models via compatible APIs. We design for provider portability because betting your infrastructure on a single model vendor is a business risk, not an engineering preference.
Do you build the agents or the infrastructure they run on?
We build the infrastructure. Your team writes the agent logic — the prompts, the tool definitions, the reasoning chains. We build the platform that makes those agents reliable, observable, and safe at scale. We can advise on agent design, but our core work is the runtime and operations layer.
How do you handle observability for agentic workflows?
We instrument every agent step with structured telemetry: which model was called, what tools were invoked, how long each step took, what the cost was, and whether the step succeeded. This data is attributed per agent invocation and per user session so you can trace a single user request through every LLM call and tool execution it triggered.
What about cost management across agentic calls?
Cost attribution happens at the agent invocation level, not the API call level. You can see that "Agent A variant 2" costs $0.32 per successful task while "Agent A variant 1" costs $0.47 — and variant 2 actually completes more tasks successfully. We also implement cost tiering so non-critical steps automatically use cheaper models.
Can agentic workflows integrate with our existing stack?
Yes. The infrastructure layer we build sits alongside your existing services. Agents call your internal APIs through the tool gateway, which enforces the same authorization and rate limiting you already use. This is not a platform migration — it is an infrastructure addition.
What guardrails exist for agent safety?
Guardrails operate at the infrastructure boundary, not in the agent's own prompt. They validate outputs for PII, enforce content safety policies, and verify that tool calls match authorized capability scopes. Because guardrails run out-of-band, a hallucinating or prompt-injected agent cannot disable, bypass, or reason around them.
How do you test agentic workflows?
We treat agent evaluation as an infrastructure concern. Deterministic test suites verify that the tool gateway correctly authorizes and rejects calls. Eval harnesses run agent variants against known inputs and measure success rates, latency distributions, and cost profiles. We build the testing infrastructure; your team defines the eval criteria.
What is your experience with agentic infrastructure in production?
We are currently deployed building and operating agentic infrastructure in production. Our runtime handles concurrent agent sessions with durable state, per-agent tool authorization, structured telemetry, and independent guardrails. This is not theoretical — it is running infrastructure we designed and built.
How do you handle hallucinations in agentic chains?
Hallucinations are not prevented — they are contained. The tool gateway rejects hallucinated tool calls before execution. Guardrails validate outputs regardless of what the agent believes. Structured output schemas force the agent into verifiable response formats. The infrastructure assumes the agent will sometimes be wrong and prevents those errors from propagating into downstream systems.
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