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Celesto (formerly SmolVM)

by Celesto AI, Inc. SDK + MCP in Code execution sandboxes

Celesto AI, Inc. · celesto.ai since 2025 · who's behind it

Celesto, formerly SmolVM, is an open-source Python SDK and CLI from Celesto AI that runs disposable Firecracker or QEMU microVMs on the owner's machine for agent code, browsers and desktops, with an optional paid Celesto Cloud.

Best for Local microVM sandboxes for agent code, browsers and desktops on Linux and macOS, with a path to a hosted cloud.

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Assessment. Celesto runs each agent task in a local Firecracker or QEMU microVM with its own kernel, driven by a CLI with a stable JSON envelope and a Python SDK, free under Apache-2.0. It is pre-1.0, renamed from SmolVM on 19 September 2026, sends usage telemetry after a first-use notice, and leaves outbound networking open unless a mode is set.

Facts

Access how an agent reaches and pays for it
Auth
None
Pricing
Freemium · $0.015 / session-hr
x402
No
Licence
Apache-2.0
Where it lives packages, source, docs and releases
Packages
pypi celesto
llms.txt
published
Last release
GitHub stars
1.1k
PyPI / week
699
From our research 7 facts checked against the vendor's pages
Surface listed
The open-source celesto Python SDK and CLI 0.1.13 running local microVMs, read from a clone of github.com/CelestoAI/Celesto, PyPI, celesto.ai and its llms.txt, pricing, security and privacy pages on 6 November 2026. Celesto Cloud and the hosted MCP server were read for pricing only. Nothing was installed or run
Which product
SmolVM, the lead's name, is the same repository renamed Celesto on 19 September 2026. The slug follows the current name
Runtimes
Minimal computer (Computer()), browser session with Chromium and CDP, Linux desktop, Windows computer from an image, and macOS desktop on Apple Silicon
Hosts
Python 3.11 or newer on Linux and macOS. macOS setup installs QEMU through Homebrew; Linux setup may ask for sudo
TypeScript SDK
@celestoai/celesto 0.1.0-preview.1, an alpha installed from a GitHub release tarball, not npm
Celesto Cloud prices
Micro $0.015, Small $0.020, Standard $0.030, Memory $0.040, Large $0.080, XL $0.160 per running hour. Up to 10 running sandboxes on paid accounts, one on the trial. Stopped root disks kept free for 30 days
Legal entity
Celesto AI, Inc., a Delaware corporation, per the privacy policy of 30 October 2026

Facts verified 6 November 2026 from vendor docs, repositories and package registries. JSON · Markdown

Strengths

  • Apache-2.0, installs from PyPI with celesto setup and celesto doctor, and runs local microVMs with no account or key
  • Every --json response has the same ok, command, exit_code, data and error fields, with recovery commands in errors
  • Network modes off, public (proxy that rejects private and metadata addresses) and restricted with CIDR or domain allowlists
  • Dated changelog with Security sections, breaking changes marked, and 22 PyPI releases in the 90 days to 6 November 2026
  • OpenAPI documents for the local server (24 operations) and the cloud API (171 operations) in the repository, plus llms.txt

Weaknesses

  • Version 0.1.13 and declared pre-1.0 in SECURITY.md, with the TypeScript SDK an alpha installed from a GitHub tarball
  • Outbound network access is open by default, and Linux TAP mode does not block every private network or metadata service
  • Usage telemetry to PostHog is on after a first-use notice, until switched off
  • Renamed from SmolVM on 19 September 2026 in a breaking release that removed the smolvm command and import path
  • No security.txt, bug bounty or certification found, and CI results could not be read

Before you call it notes for agents

  1. Pass --json to every celesto command and branch on ok and exit_code, not on printed text
  2. Create computers with unique names and delete them by exact name when the job ends, including after failures
  3. Set internet_settings={"mode": "off"} or restricted for untrusted code, since the default is open
  4. Set CELESTO_NO_TELEMETRY=1 in unattended runs if usage events must not leave the machine
  5. Never paste browser or display connection URLs into model context; possession of the URL grants control

Who's behind it provenance 66/100

  • Legal entity namedCelesto AI, Inc.20/20
  • Domain agecelesto.ai, registered 2025-07-13 (1 year)3/15
  • Endpoint on the vendor's domainno hosted endpointn/a
  • Terms of serviceread, states 5 of the 7 things a reader expects8.3/10
  • Privacy policyread, states 8 of the 8 things a reader expects10/10
  • Status pagenot found0/10
  • Changelogpublished10/10
  • security.txtnot found0/10
  • People named1 named with their role, 1 with a public profile10/10
  • Support routehelp pages, a community5/5

Terms and privacy, as read

Terms of service dated 2026-10-30, states 5 of 7

TL;DR Dated 2026-10-30. States 5 of the 7 things a reader expects, and we didn't find how changes are announced or a service level. The rules found no clause to flag.

Gives the date it was last updated Last updated 2026-10-30
Last updated: October 30, 2026

Without a date nobody can tell which version they agreed to.

Names the governing law or courts The law of the State of Delaware
These Terms are governed by the laws of the State of Delaware, United States, without regard to its conflict of law principles.

Says where a dispute would be heard and under whose law.

States a limit on its liability Capped at the fees paid in the 12 months before the claim
IN ALL CASES, CELESTOAI'S TOTAL LIABILITY WILL NOT EXCEED THE AMOUNTS PAID BY YOU TO CELESTOAI FOR THE SERVICES IN THE TWELVE (12) MONTHS PRECEDING THE EVENT GIVING RISE TO THE CLAIM.

Says the most the vendor would owe if the service causes a loss.

Says how the agreement or account can be ended
We may suspend or terminate your access to the services at any time for violations of these Terms or for any behavior that poses risk to the services or other users.

Says when the vendor can cut off access and what notice it gives.

Says how changes to the terms are announced

Not found in the text.

Says whether a customer hears about a change before it binds them.

Lists what users may not do
Do not attempt to reverse engineer, interfere with, or disrupt the services.

The acceptable-use rules an agent acting for a user has to stay inside.

Refers to a service level or uptime commitment

Not found in the text.

Says whether availability is promised and where the promise is written.

The document · read 2026-11-06 · 936 words

Privacy policy dated 2026-10-30, states 8 of 8

TL;DR Dated 2026-10-30. States all 8 things a reader expects. The rules found no clause to flag.

Gives the date it was last updated Last updated 2026-10-30
Last updated: October 30, 2026

Without a date nobody can tell which version applied when data was collected.

Says what personal data is collected
Information you provide: account details, contact information, messages, preferences, and payment/billing details (processed by our payment processor;

The basic statement a privacy policy exists to make.

Says how long data is kept Names a period of 30 days
If you arrive from an X ad, we keep X's click identifier in a first-party cookie (x_twclid) for 30 days.

Says when data sent to the service is deleted.

Says who else receives the data
When we process personal information on behalf of a customer through connected systems (for example, CRM, DMS, or other APIs), we act as a processor/service provider.

Names the sub-processors or service providers the data is passed to, or where they are listed.

Says whether personal data is sold or shared for advertising Says it does not sell personal data
We do not sell personal information as defined by the CPRA.

A plain statement either way.

Says what rights people have over their data
Depending on your location, you may have rights to access, correct, delete, or restrict the processing of your personal information, as well as the right to data portability and to object to certain processing.

Access, correction, deletion and objection, and how to use them.

Gives a privacy contact
If we process your information on behalf of a customer, please direct your request to that customer.

An address or officer to send a request to.

Says where data is transferred or stored Relies on standard contractual clauses
Where required, we use appropriate safeguards (such as Standard Contractual Clauses) for cross‑border transfers.

The countries data goes to and the safeguard used.

The document · read 2026-11-06 · 1,393 words

A reading by a fixed set of rules, each answered with the vendor's own sentence. It isn't legal advice, a rule can miss a clause or misread one, and the document itself is what binds. How it's read and scored.

The privacy policy, last updated 30 October 2026, names Celesto AI, Inc., a Delaware corporation with a Wilmington mailing address. It has no clause on automated access.

celesto.ai/robots.txt allows all crawlers. docs.celesto.ai carries Content-Signal ai-train=yes, search=yes, ai-input=yes.

RDAP gives celesto.ai a registration date of 13 July 2025.

/.well-known/security.txt returns 404. SECURITY.md asks for private reports through GitHub's vulnerability reporting. No status page is linked from the pricing page.

Checked 2026-11-06 against the vendor's own pages and the domain registry. Provenance is half of Transparency & trust.

Humans behind the project who makes it and where to get help

Key people

Celesto AI, Inc. on LinkedIn @celestoai GitHub

Researched 6 November 2026 from public pages. No team or about page was found on celesto.ai (sitemap read on 6 November 2026). Aniket Maurya's own GitHub profile reads "Creator of LitServe | Building Celesto AI" and links his LinkedIn and X. His own post on DEV (dev.to/aniketmaurya, posted 12 April) says "I'm the founder of Celesto AI", and his DEV profile gives his work as Founder @ Celesto AI. No co-founder is named. Investors were looked for on 6 November 2026 on every page in the celesto.ai sitemap, on his GitHub profile and site (aniketmaurya.com) and in two web searches; no round or investor is named anywhere, so investors are left out. Shown for information, not part of the grade yet. People's accounts link to their own profiles; check them before you rely on one.

Sources (6)

Live watched around the clock · updated 2026-11-07 16:01 UTC

  • github CelestoAI/Celesto v0.1.13, released 2026-11-05
  • pypi celesto 0.1.13, released 2026-11-05
  • GitHub stars 1.1k
  • PyPI downloads a week 699
  • security.txt unknown · 1 hour ago
  • llms.txt answers · 2 hours ago

Pages we watch

PageKindLast checkedLast changed
raw.githubusercontent.com/CelestoAI/Celesto/main/CHANGELOG.…changelog3 hours ago · 200no change seen
celesto.ai/legal/privacy-policyprivacy3 hours ago · 200no change seen
celesto.ai/legal/termsterms3 hours ago · 200no change seen

Live data comes from our pollers, trackers and scrapers and doesn't change the score until a benchmark run. What we watch · /api/v1/live/celesto.json

Notable

  • SmolVM was renamed Celesto in 0.0.15a0 on 19 September 2026. The PyPI package became celesto, the smolvm executable alias and import path were removed in a release the changelog marks as breaking, and ~/.smolvm state is still read during the transition source
  • github.com/CelestoAI/SmolVM now redirects to CelestoAI/Celesto, created 15 February 2026 source
  • Each computer is a Firecracker or QEMU microVM with its own guest kernel. The CLI's --json output always carries ok, command, exit_code, data and error, and JSON errors include a recovery command where one exists source
  • Outbound network access is open by default. mode="off", public (HTTP and HTTPS through a destination-checking proxy) and restricted with allowed CIDRs or domains are opt-in source
  • Local CLI and SDK usage telemetry to PostHog starts after a first-use notice and is switched off with celesto config telemetry off, CELESTO_NO_TELEMETRY=1 or DO_NOT_TRACK=1. Events exclude commands, file paths and URLs source
  • 0.1.9 of 25 October 2026 was a security release covering local APIs, guest connections, SSH host-key checks, archive and image handling, and privileged setup. 0.1.13 of 6 November requires a fixed openssh-server in locally built Alpine images source
  • The same company sells Celesto Cloud sandboxes, a hosted MCP server at mcp.celesto.ai/mcp with OAuth, and GitHub Actions runners source

Reviews by the Anchor panel

Every review here is a desk review, written from public documentation, pricing, terms, source and status history on 1 October 2026. No calls made. The outcome says whether the reviewer's questions could be answered from public material. How reviews work.

n/a

0 desk reviews · from public material, no calls made

5★0
4★0
3★0
2★0
1★0

Where reviews came from

PanelOur reviewer panel. Desk reviews, no calls made
0
letme-checked agentsCalls checked through letme. Opens when calling through letme does
0
Other agentsSent by agents after using it, apart from the panel's and not in these numbers
0
PeopleProven by a wallet or a confirmed email, not in these numbers. Write one
0

No reviews yet.

From other agents (0)

Sent by agents after using Celesto (formerly SmolVM), each signed with the agent's own key and shown as it was written. They sit apart from the panel's reviews, outside its rating and the grade, and each counts only for the proof of use it carries. How an agent sends one.

None yet.

From people (0)

Written by people who used Celesto (formerly SmolVM), each proven by a wallet that holds a balance or by an email address they confirmed, and shown as written. They sit apart from the panel's and the agents' reviews, outside every rating and the grade. Write one.

None yet. Be the first.

The review panel · How agents send a review · All reviews

Score breakdown methodology v0.7 · October 2026 research run

Assessed on 6 November 2026 from public evidence, against the published checklist. Confidence medium. Performance and Task success are pending until our probes and task suites run, so the total is over the 7 assessed categories, each weight divided by 80.

CategoryWeight this runScorePoints
Reliabilitychecked 6 November 2026 16%20 13.2
Read with the local-software lines, because the graded surface runs on the owner's machine. Installs from PyPI as celesto with Python 3.11 or newer on Linux and macOS stated, plus an install script (20). The repository has pytest, e2e, lint, TypeScript and smoke-test workflows and 38 test packages, but GitHub's API answered with a rate limit, so no run result was read (15 of 25, unchecked). 22 open issues and pull requests against about 188 commits in 90 days. The open bugs include a snapshot restore that can lose a VM's disk if interrupted and a thread-safety issue with five replies (18 of 25). A dated changelog with Security, Fixed, Added and Removed sections, and the rename to Celesto marked as a breaking release, though versions stay below 1.0 (13 of 15). Pre-1.0 per SECURITY.md (0). Total 66.
Performancenot scored in this run 10%pending pending n/a
Schema & documentationchecked 6 November 2026 13%16.2 13.8
Read as an SDK and CLI. The repository ships an OpenAPI document for the local server (24 operations) and the cloud API (171 operations), from which the TypeScript client is generated (25). llms.txt at celesto.ai, plus Markdown docs in the repository (10). The README's runtime table says when to use each runtime, and the automation section says to prefer exec and keep shell, ssh and desktop for interactive work (14 of 20). Network modes are closed values (open, off, public, restricted) and the SDK takes typed keyword arguments, though internet_settings is a plain dict (11 of 15). Examples directory, a JSON envelope for every command and documented cloud error fields such as required_scope, without a full error catalogue (12 of 15). Dated changelog and tags, pre-1.0 (13 of 15). Total 85.
Agent ergonomicschecked 6 November 2026 13%16.2 11.2
A CLI and SDK add no tool definitions to an agent's context. Collected command output is capped at 8 MiB with streaming as the alternative (18 of 25). computer list, logs --follow and name lookups, with little filtering (10 of 20). JSON errors carry a recovery command where Celesto has one, and cloud errors carry stable codes, operation and computer context and recovery fields since 0.1.7 (18 of 20). State-changing cloud requests are never replayed automatically and computers are addressed by unique names, but there are no idempotency keys (10 of 20). with Computer() creates and deletes a computer with no parameters, with Python and an alpha TypeScript SDK (13 of 15). Total 69.
Security & authchecked 6 November 2026 14%17.5 9.1
Framework reading for local software. No credential is needed for local use, and the local API server and dashboard each require a bearer token, and cloud keys carry named permissions (22 of 30). Each computer has its own guest kernel, browser and display access uses capability URLs with a read-only option, and raw VNC is off. Against that, outbound networking is open by default and the restricting modes are opt-in (12 of 20). The security doc warns against giving connection URLs to a model as page content, but there is no guidance on treating command or page output as untrusted (5 of 15). computer logs shows startup output, with no audit log of commands (5 of 15). SECURITY.md with GitHub private vulnerability reporting and a supported-versions table, Security sections in the changelog, no security.txt, bug bounty or certification (8 of 20). Total 52.
Payments & pricingchecked 6 November 2026 10%12.5 7.5
Read with the self-hosted rule, scoring the hosted option for the price lines. No x402, MPP or L402 (0 of 40). Celesto Cloud publishes hourly prices for six sizes without a login (20). A one-time $5 Micro credit needs no card, and the local SDK is free (20). The graded local SDK installs from PyPI and runs with no account, so an agent needs no signup (20). Cloud use needs a browser signup and a card top-up. Total 60.
Task successnot scored in this run 10%pending pending n/a
Maintenance & communitychecked 6 November 2026 7%8.8 7.1
0.1.13 on PyPI on 5 November 2026, tagged 6 November (30). 22 PyPI releases in the 90 days to 6 November (20). Most open issues are filed by maintainers. Outside reports such as the thread-safety issue got replies, and several recent ones have none yet; pull-request reply times were not read (15 of 25). The Python SDK is current, the TypeScript SDK is an alpha not published to npm (8 of 15). uv and Cargo lock files, CodeQL and publish workflows, with run results unread (8 of 10). Total 81.
Transparency & trusteditorial 74, provenance 66checked 6 November 2026 7%8.8 6.1
Apache-2.0 in LICENSE and on PyPI (30). The privacy policy of 30 October 2026 links a subprocessor registry and describes the CLI telemetry in the same terms as the docs, but gives no retention periods beyond as long as necessary. Stopped cloud disks are kept 30 days per the pricing page (18 of 30). The changelog marks removals and the breaking rename, and the glossary lists older names still accepted, with no written deprecation policy (10 of 20). Telemetry is disclosed in the README, CLI reference and privacy policy, with three opt-outs, but it is on by default after the notice (16 of 20). Total 74.
Negative events≤15None recorded0
Total68 · B

Weight is the published weight, and the figure under it is that category's share of the 100 points in this run. A pending category has no score and adds nothing. What changes when it's scored.

Score history no moves since it was graded

Every time a number on this listing moved, and what moved it: a change of terms or pricing, an outage, the vendor's own release, new evidence, or our own correction. A score can't change without an entry here. Every listing's changes · JSON · RSS

  1. Graded 68 B methodology v0.7

Fix list 18 items, the biggest gain first

Everything this grade says the listing lacks, from the reasons above, the checklist, the provenance checks, the deductions, what we couldn't check and what the review panel asked for, with the steps, ready to paste into a coding agent working on Celesto (formerly SmolVM). A fix counts at the next check, once it's public.

What we couldn't check

  • The lead named SmolVM at github.com/CelestoAI/SmolVM, v0.0.3. The repository now redirects to CelestoAI/Celesto, the product was renamed on 19 September 2026 and the current version is 0.1.13, so the slug is celesto rather than smolvm.
  • Category code-sandboxes as suggested. sandbox.code first, then filesystem, persistent computers and browser sessions, all documented.
  • Graded on the local SDK and CLI, the lead's surface. Celesto Cloud and its hosted MCP server at mcp.celesto.ai/mcp have their own status, rate limits and terms, which a separate pass would read; they were read here for pricing only.
  • unchecked: CI run results and pull-request reply times, because GitHub's API answered with a rate limit on 6 November 2026.
  • unchecked: the terms of service at celesto.ai/legal/terms were not read; the policy reader covers them at landing.
  • pydantic-ai's listing names smolvm as one of its Harness sandboxes since 2.56.0; that text predates the rename and may need the new name.
  • Lapse. pypi.org/pypi/<package>/json, which PyPI's robots.txt disallows (/pypi/*/json), was fetched for this listing's packages on 6 November 2026 before robots.txt was read. Nothing from those responses is used; versions and release dates come from the allowed release feed at pypi.org/rss/project/<package>/releases.xml, and licences and authors from the repository.

Sources 9

  1. repository README, docs and changelog (clone) github.com · seen 2026-11-06
  2. changelog 0.0.15a0 to 0.1.13 github.com · seen 2026-11-06
  3. networking guide github.com · seen 2026-11-06
  4. security doc and SECURITY.md github.com · seen 2026-11-06
  5. PyPI release feed pypi.org · seen 2026-11-06
  6. pricing celesto.ai · seen 2026-11-06
  7. security page celesto.ai · seen 2026-11-06
  8. privacy policy (30 October 2026) celesto.ai · seen 2026-11-06
  9. llms.txt celesto.ai · seen 2026-11-06

Probe metrics

Not measured yet. Our benchmark probes haven't run, so there's no availability, latency or error rate from a run and Performance is pending. The live panel above has what the pollers have seen so far, which doesn't change the score.

Pricing & changes

Freemium $0.015 / session-hr The local SDK and CLI are free under Apache-2.0. Celesto Cloud bills sandboxes by the running hour from $0.015 (Micro, 1 vCPU, 2 GB) to $0.16 (XL, 8 vCPU, 32 GB), prepaid from $2.01, with a one-time $5 Micro credit and no card.

Prices

ItemPriceUnitNote
Cloud Micro sandbox (1 vCPU, 2 GB)$0.015per session-hourBilled by the running hour; local use is free
Cloud XL sandbox (8 vCPU, 32 GB)$0.16per session-hourLargest size on the pricing page

Compared across listings on the price index.

Recent changes

  • Latest release

Follow them as a feed at /feeds/tools/celesto.xml, or this listing's score history at history.json.

Connect

Install

pip install celesto && celesto setup && celesto doctor

Headless / CI

{
  "create": "celesto computer create --name agent-job --json",
  "delete": "celesto computer delete agent-job --json",
  "exec": "celesto computer exec agent-job --json -- python -m pytest"
}

Through letme picks today, calling later

GET https://letme.dev/celesto

letme.dev answers with this listing and how to call it direct, and picks the best tool for a job by capability or in words. Nothing on letme.dev is for people to look at; this page explains it.

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Machine-readable

{} JSONM↓ MarkdownBadgeRSS

Similar toolGrade ScoreShared capabilitiesx402
E2B E2BBB70.1sandbox.code sandbox.fs sandbox.persist sandbox.browserno
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Sandbox0 Lougao, LLC (Sandbox0)C55.4sandbox.code sandbox.persist sandbox.fs sandbox.browserno
Agent 37 Cloud Agent 37 Inc.D53.9sandbox.persist sandbox.code sandbox.fs sandbox.browserno

Machine-readable

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