The managed runtime for long-horizon agents

Durable, observable, governed execution for agents that need to run for months. Use Constal SDK or bring your own framework.

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No. 01

LONG HORIZON

Long agent runs that never lose their mind.

Every step is checkpointed to the state fabric. Agents suspend between events, resume from durable state, and survive crashes, deploys, and two-week human approvals.

Sleep is free.

Suspended agents cost nothing. State is pinned until a timer, webhook, or human wakes them.

Crash = retry, not restart.

Execution replays from the last checkpoint, side-effects deduplicated. No lost work, no double sends.

Human-speed gates.

Approvals can take seconds or weeks. The run waits durably and resumes exactly where it stopped.

No. 02

OBSERVABILITY & GOVERNANCE

Glass-box execution.

Every model call, tool call, and state change is traced by default — and every one of them passes through policy before it executes.

TRACE — run_8f3a · researcher · 31d 4h LIVE

llm.plan 320ms

tool:web.search 1.2s

checkpoint —

llm.reason 640ms

tool:browser.run 2.1s

human.gate —

sleep 16d

resume —

llm.synthesize 480ms

tool:report.write 1.4s

complete day 31

RBACRoles scoped down to the individual tool call

AUDITHash-chained log of every action, exportable

BUDGETSToken and dollar ceilings per agent, team, or run

POLICYAllow, deny, or gate any call behind approval

REDACTIONPII scrubbed at the runtime boundary

SSO/SCIMEnterprise identity from day one. SOC 2 in progress

No. 03

EXECUTION & PERFORMANCE

Cloudflare-backed, from ingress to execution.

Constal runs on Cloudflare's global network so agents start close to their users, execute alongside durable session state, and scale without a fleet of idle servers.

GLOBAL INGRESS Requests enter through the global edge instead of a single fixed region. DISTRIBUTED

SESSION EXECUTION The agent loop stays colocated with its durable session state. STATEFUL

ELASTIC SCALE Capacity follows demand without pre-provisioning or keeping workers warm. AUTOMATIC

No. 04

COMPATIBILITY

Build in any framework. Run it on Constal.

Frameworks are how you write agents. Constal is where they run. Deploy the code you already have: no adapters, no forked SDKs, no lock-in. Every step is checkpointed at the runtime boundary, and the code that runs on your laptop is the code that runs in prod.

agent.ts — your LangGraph code, as-is

import { StateGraph } from "@langchain/langgraph";

const graph = new StateGraph(ResearchState)
  .addNode("plan", plan)
  .addNode("act", act)
  .addEdge("plan", "act")
  .compile();

export default graph;

No. 05

COMPOSABILITY

One runtime, many agents.

Agents coordinate through the runtime, not glue code. A LangGraph planner hands off to a Mastra support agent or an OpenAI SDK researcher with typed handoffs, shared durable state, and one trace stitched across the whole architecture.

No. 06

MODULAR

Every layer is a module.

The core is opinionated: state, scheduling, and policy are the runtime. Around it, every integration point is swappable without touching the rest.

i. STATE FABRIC Checkpointed agent state, replicated across zones. Query it like a database. CORE

ii. SCHEDULER Timers, crons, webhooks, and human gates wake agents when work arrives. CORE

iii. SANDBOX POOL Snapshot-warmed microVMs for tool and code execution. Hard isolation per run. CORE

iv. MODEL GATEWAY One interface to every provider, with fallbacks, caching, and cost metering. OPENAI-COMPAT

v. MEMORY STORE Session, entity, and long-term memory with retention policies attached. S3-COMPAT

vi. POLICY ENGINE Executable policy over every call: allow, deny, constrain, or require approval. CORE

vii. BYOC Run Constal in your own Cloudflare account. COMING SOON

Your agents, running today.

Have a multi-step workflow in mind? We can build and launch the long-horizon Agent with you through a one-year engagement.

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