mycelium

Software built
for AI agents.

A new kind of user needs a new kind of software.
We’re building it. Starting with the browser.

ON THIS PAGE
↑ ↓ to navigate ↵ to openMYCELIUM

First up: Celium Browser. In development. Coming soon.

AGENTS ARE THE USERS.
SOFTWARE IS OUR WORK.
SCROLL TO EXPLORE

WHY WE’RE BUILDING

Software grew up with humans.
Its next users are agents.

Buttons, dashboards, menus. Most software expects a person on the other side. AI agents need structured information, explicit actions, and interfaces they can use programmatically. Mycelium builds software with the agent as the primary user.

A new user. The same old interface.

An agent should be able to call an action, not hunt for a button.

THE GAP
PRODUCT 001 / CELIUM BROWSERIN DEVELOPMENT / COMING SOON

Meet Celium.
The browser for agents.

Our first product is a browser runtime built on Chromium. We’re designing it to turn live pages into structured views, expose clear actions, and keep a record of each step. The agent is the user, from the first call to the final result.

Talk to us about Celium

The page.
In the agent’s language.

Headings, text, links, and named controls.
A structured view with page-scoped references.

research / library⌘
Research libraryPAGE VIEW
h1

Latest papers

input

Search papers

01
button

Search

02
link

Paper details

03
REFS SCOPED TO THE CURRENT PAGE STATE
PRODUCT CONCEPT / ILLUSTRATIVE OUTPUT
The next action
type(01, "agent memory")
click(02)
✓

Read the updated page
Refresh references before continuing.

PRODUCT CONCEPT / ILLUSTRATIVE OUTPUT

Clear actions.
Structured results.

Open, read, click, type, scroll, extract.
Planned MCP, API, and CLI access.

Every step.
A trace you can follow.

What the agent saw, did, and got back.
Session records designed for debugging.

Session replay001
  1. Opened research libraryPAGE STATE / 01
  2. Entered a searchACTION / TYPE
  3. Read the updated resultsPAGE STATE / 02
PRODUCT CONCEPT / ILLUSTRATIVE OUTPUT

DESIGNED TO BE CALLED

No mouse required.

Software for agents starts at the interface. Here’s the access layer we’re planning for Celium.

01MCP
Browser tools exposed directly to compatible agent clients.
02API & CLI
Explicit inputs, structured outputs, and errors an agent can act on.
03Machine-readable docs
Clear schemas, Markdown documentation, and runnable examples.
04Sessions & permissions
Persistent sessions, domain limits, and approval for sensitive actions.

WHERE WE’RE STARTING

From a live page
to useful work.

RESEARCH

Find. Read. Compare.

Navigate sources and collect the details an agent needs to answer a question.

EXTRACTION

A page becomes data.

Return information in a requested schema, ready for the next step in a workflow.

Research and structured extraction are our initial focus. Form workflows and authenticated sessions are planned next.

First, the browser.
Then, the work ahead.

Celium is the first step in Mycelium’s mission: software for AI agents.
We’re building the prototype and will evaluate it on real browsing tasks.

Task completionTokens usedTime takenTotal cost
CELIUM BROWSER / IN DEVELOPMENT / COMING SOON