docs: add Agent Sandboxes enhancement proposal

Introduces the product-level proposal for Agent Sandboxes: a new
compute experience for AI agents that need isolated, ready-to-use
environments on demand.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: scotwells

docs/compute/development/enhancements/agent-sandboxes.md

@@ -0,0 +1,243 @@
+# Agent Sandboxes
+
+Status: Proposal
+Audience: Product, platform operators, prospective customers
+Date: 2026-04-08
+
+## What we're building
+
+A new Datum compute experience purpose-built for **AI agents that need
+their own isolated, ready-to-use environment**. Instead of asking users to
+assemble a workload, pick regions, and configure scaling, we're shipping a
+small set of resources that let anyone — or any agent — say:
+
+> "Give me a copy of the Python data-science sandbox, just for this session."
+
+…and get a fully initialized, isolated environment back in the time it takes
+to load a web page.
+
+We call the new capability **Agent Sandboxes**.
+
+## Why we're building it
+
+The teams building AI agents today are stuck between two bad options:
+
+- **Run everything in one shared container.** Cheap and fast, but anything
+  the agent does — installing packages, executing model-generated code,
+  touching files — leaks into the next session. One bad command can break
+  the environment for everyone.
+- **Spin up a full cloud workload per session.** Properly isolated, but
+  slow to start, expensive to keep idle, and wildly over-engineered for
+  "I just need a Python process for the next 20 minutes." Users have to
+  learn deployment concepts that have nothing to do with their problem.
+
+Neither option fits how agents actually work. An agent platform typically
+needs **many small, short-lived, strongly isolated environments**, created
+on demand, often hundreds or thousands per day, with state that survives a
+pause and disappears when the session ends.
+
+This is also where the broader ecosystem is heading. The Kubernetes
+community has started a project — [agent-sandbox][upstream] — specifically
+to standardize this shape of compute. Datum is well-positioned to offer a
+best-in-class version of it: our underlying infrastructure (Unikraft-based
+microVMs with snapshot/restore) makes "instant, isolated, stateful" the
+default rather than the exception.
+
+The product opportunity is to turn agent sandboxes into a **catalog Datum
+ships and curates**, the way cloud providers ship machine images — except
+allocation is measured in milliseconds and idle copies cost almost nothing.
+
+## What becomes available
+
+Three new resources, layered so that the simple case stays simple and the
+advanced case stays possible.
+
+### 1. `Sandbox` — one isolated environment
+
+The core building block. A `Sandbox` represents a single, isolated, stateful
+environment running one image. It has a stable name, stable network address,
+and persistent storage that survives pause and resume.
+
+This is the lowest-level resource. Most users never touch it directly.
+
+### 2. `SandboxTemplate` — a reusable, curated environment definition
+
+A **named, versioned blueprint** for a kind of sandbox: which image to run,
+how much CPU/memory, which ports to expose, how long to keep it warm, what
+isolation level to use. Datum ships and maintains a catalog of these out
+of the box — `python-agent-runtime`, `node-agent-runtime`, `code-interpreter`,
+`headless-browser`, `jupyter-datascience`, and so on. Customers and partners
+can publish their own templates into their own namespaces using the same
+mechanism.
+
+Templates are the product surface. They are what users browse, pick, and
+build against.
+
+### 3. `SandboxClaim` — "give me a copy of that template"
+
+The user-facing request. A `SandboxClaim` says "I want a fresh sandbox based
+on template X, with these small overrides." The platform produces a per-claim
+`Sandbox` that is a fully independent copy — its own identity, its own
+storage, its own lifecycle.
+
+A claim is typically 5–10 lines and can be created by an agent without any
+documentation. It is the resource an agent platform creates per session,
+per user, or per task.
+
+### Behind the scenes: warm pools
+
+Each `SandboxTemplate` can keep a pool of pre-initialized copies ready to
+go. When a claim arrives, the platform hands out a warm copy and refills
+the pool in the background. The user sees a sub-second allocation; the
+operator sees a tunable knob on the template.
+
+Warm pools are not a separate resource the user or operator has to manage —
+they're a property of the template.
+
+## How this fits the existing platform
+
+Datum already has a `Workload` resource for declarative, multi-region,
+horizontally scaled applications. `Workload` is and remains the right tool
+for production services. Agent sandboxes are a *different* shape of compute:
+
+| | **Workload** | **Agent Sandbox** |
+|---|---|---|
+| Cardinality | Many replicas across regions | One environment per session |
+| Lifetime | Long-running | Minutes to hours, then gone |
+| Scaling | Horizontal, automatic | None — each sandbox is its own unit |
+| State | Usually external (DB, cache) | Local, persistent across pause |
+| Allocation time | Seconds to minutes | Milliseconds (from warm pool) |
+| Who creates it | A human, once | An agent, thousands of times |
+
+The two live side-by-side. We are not replacing `Workload`; we are adding
+the right primitive for the use case it was never designed for.
+
+As part of this work, the underlying repository is being renamed from
+`workload-operator` to **`compute`** to reflect that it now owns
+more than one top-level concept on the Datum compute platform.
+
+---
+
+## User journeys
+
+### Journey A — The agent platform (consumer)
+
+**Persona.** Maya is building an AI coding assistant. When a user asks her
+agent to "analyze this CSV and plot the results," the agent needs to write
+and execute Python in a fresh, isolated environment, then throw it away.
+
+**Today, without agent sandboxes.** Maya stands up a Kubernetes cluster,
+writes a custom controller that creates pods per session, figures out how
+to give each pod its own storage, builds a queue of pre-warmed pods to
+hide cold starts, writes a janitor to clean up dead sessions, and worries
+constantly about whether one user's `pip install` can affect another's.
+Months of work before her agent runs its first line of code in production.
+
+**With agent sandboxes.**
+
+1. Maya browses the Datum sandbox catalog and picks `python-data-science`.
+   She reads the one-page description: Python 3.12, pandas, numpy,
+   matplotlib pre-installed, 2 GB RAM, 10 GB scratch disk, isolated per copy.
+2. In her agent code, when a session starts, she creates a `SandboxClaim`
+   referencing that template. Five lines of YAML, or one API call.
+3. Within tens of milliseconds, the claim reports `Ready` with an endpoint
+   her agent can connect to. The environment is fully initialized — the
+   Python interpreter is warm, libraries are loaded, ready for the first
+   command.
+4. Her agent uses the sandbox: writing files, executing code, generating
+   plots. Everything stays inside that one copy.
+5. When the user's session ends — or after 15 minutes of inactivity —
+   the sandbox is deleted. Storage goes with it. No cleanup code on
+   Maya's side.
+6. If Maya wants something not in the catalog, she pushes her own image
+   and Datum builds a custom template for her in her own namespace. The
+   per-claim experience is identical.
+
+**What Maya never has to think about:** regions, scaling, image building,
+warm pools, cluster sizing, isolation backends, snapshot management,
+garbage collection, or the difference between a "container" and a "VM."
+
+### Journey B — The internal team (operator)
+
+**Persona.** Devon is on the Datum platform team. He owns the catalog of
+sandbox templates Datum ships to customers. A new team has asked for a
+`headless-browser` sandbox for agents that need to scrape and screenshot
+web pages.
+
+**With agent sandboxes.**
+
+1. Devon writes a Dockerfile for the headless-browser environment:
+   Chromium, Playwright, a small HTTP wrapper. Standard stuff.
+2. He creates a `SandboxTemplate` in the Datum catalog namespace pointing
+   at that image. He sets resource sizing, the ports to expose, a default
+   idle timeout of 10 minutes, and a warm pool size of 10.
+3. Datum's build pipeline picks up the new template, builds the image
+   for the appropriate isolation backend, validates it, and starts the
+   warm pool. Devon watches the template's status go from `Building` to
+   `Ready`.
+4. Devon runs a few test claims against it, confirms the browser works,
+   sets the template to `Published`. It now appears in the customer-facing
+   catalog.
+5. A week later, traffic has grown. Devon raises the warm pool from 10
+   to 50 by editing one field on the template. No customer change needed.
+6. A security advisory drops for Chromium. Devon publishes
+   `headless-browser:1.1` as a new template version. New claims get the
+   patched version automatically; existing live sandboxes keep running on
+   the old version until their sessions end. No fleet-wide restart.
+7. Datum's billing and observability surfaces show per-template usage:
+   how many claims, how long they live, how often the warm pool runs dry,
+   how much storage they consume. Devon uses this to right-size the pool
+   and report ROI.
+
+**What Devon never has to think about:** writing a controller, managing
+pods, hand-rolling a warm-pool scheduler, building a per-copy storage
+system, or coordinating rollouts across regions.
+
+### Journey C — The end customer of the agent (incidental)
+
+**Persona.** Priya is using Maya's coding assistant. She doesn't know what
+Datum is and never will.
+
+What she experiences: she asks the agent to do something. The agent
+responds in roughly the same time it would take any chatbot. Behind the
+scenes, a sandbox was claimed, used, paused, and cleaned up — but to
+Priya, it just felt like the assistant worked. Her data didn't leak into
+anyone else's session, and the assistant didn't get slower as more people
+used it.
+
+That invisible reliability is the actual product.
+
+---
+
+## What success looks like
+
+- **Time-to-first-sandbox** for a new agent platform: under one hour from
+  signup, with no infrastructure code written.
+- **Claim-to-ready latency** against a catalog template: under 50 ms at
+  the 95th percentile.
+- **Idle cost** of a paused sandbox: an order of magnitude lower than
+  a comparable always-on container.
+- **Catalog breadth**: Datum ships at least the top 5 agent runtimes
+  (Python, Node, code interpreter, headless browser, notebook) in the
+  initial release, with a clear path for customer-published templates.
+- **Operator ergonomics**: a new sandbox template can be added to the
+  Datum catalog by one engineer in under a day.
+
+## Open product questions
+
+- Which templates ship in the launch catalog, and in what order?
+- What is the pricing shape — per claim, per active sandbox-minute,
+  per warm-pool slot, or some combination?
+- Do we expose customer-published templates in v1, or hold them for v2?
+- How do we surface template versioning and deprecation to consumers
+  who may have thousands of live claims at any moment?
+
+## What's *not* in scope
+
+- Replacing `Workload` for long-running, multi-region production services.
+- A general-purpose VM or container product. Agent sandboxes are
+  opinionated on purpose: one image, one copy, one session.
+- A development IDE or notebook UI. Datum provides the runtime; the
+  agent platform or developer tool provides the experience on top.
+
+[upstream]: https://github.com/kubernetes-sigs/agent-sandbox