Coder

The Coder is your autonomous coding agent. Assign it a task in Momental, and it:

Spins up an isolated cloud container
Clones your repository
Understands the codebase semantically via Code Intelligence
Implements the feature or fix
Runs your tests
Opens a pull request
Reports back with a summary

It never stores your source code. Each container is destroyed after the task completes. Works best on tasks with clear acceptance criteria — the more specific, the better.

What the Coder does

When you assign a task to the Coder, it reads your task description, acceptance criteria, and relevant knowledge graph context (engineering DECISION and PRINCIPLE atoms). Then it implements the work using a frontier AI model with full access to your codebase.

Before touching any file, it uses Code Intelligence to understand the blast radius of the change — what other functions call the code it's modifying, what tests cover it, and what would break. It implements with context, not just isolated code generation.

When it activates

A task has clear acceptance criteria and is assigned to the Coder
An epic subtask is ready to implement
A bug is reported and needs a fix with a PR
Tests need to be written for existing code
A refactor has been planned and needs execution

What it needs

GitHub connected (Settings → Connections → GitHub)
A task with a clear description and acceptance criteria
The more specific the AC, the better the output
Optionally: Code Intelligence indexed (makes it significantly better on large codebases)

What it produces

A pull request opened against your default branch
A branch named feat/<task-slug>
A summary comment on the task with what was done and test results
Vega auto-reviews the PR if connected

Security model

Your code is protected by multiple layers of isolation. The Coder never has access to another customer's repository, credentials, or data.

Ephemeral containers — each execution runs in a dedicated, isolated container destroyed after the task. No persistent filesystem between tasks.
Single-tenant credentials — the container receives only your team's GitHub token and repo URL. No other credentials.
Per-team tokens — GitHub App installation tokens are generated on-demand with 1-hour expiry and are never stored.
No source code stored — the Coder clones your repo into an ephemeral container. Code Intelligence builds a semantic map (not full source files), scoped exclusively to your team.

Setup

Subscribe to a Pro or Enterprise plan — visit Settings → Billing.
Connect GitHub — go to Connections → GitHub and install the Coder GitHub App on your organization.
(Recommended) Index your codebase — run the indexer so the Coder understands your code semantically:
```
npm install -g @momentalos/cli
momental-indexer --dir . --api-key mmt_YOUR_KEY --name your-repo
```
Assign a task — create a task with clear acceptance criteria and assign it to the Coder from the Plans page.

Best for

Feature implementation from task descriptions
Bug fixes with full codebase context
Test writing for existing code
Refactoring with blast-radius awareness
Documentation generation from source
Dependency updates and migration scripts