Atlas is a terminal-native AI coding agent for SolidJS in 2026, where signals are the reactivity model and a component body runs exactly once. Atlas runs in a Solid project with a vite.config.ts using vite-plugin-solid, reads your createSignal, createMemo, and createEffect graph plus any SolidStart routes, and proposes each edit as a unified diff. Atlas can fix a destructured prop that broke reactivity, which is the single most common Solid bug, and it can add tests with @solidjs/testing-library and run vitest behind a permission prompt.
Why SolidJS developers use Atlas
SolidJS developers use Atlas partly because Atlas is a terminal-native TUI rendered with SolidJS through the OpenTUI renderer. Atlas also indexes code by AST declarations using tree-sitter, not blind line windows, so a 2026 search returns the real createSignal or createMemo declaration.
SolidJS is one of the few frameworks whose mental model an AI agent regularly gets wrong, because most training data is React. In Solid a component body runs exactly once, signals are functions you call, and reactivity is tracked at the point of read. Atlas searches code with hybrid semantic and keyword retrieval fused by reciprocal rank fusion, so asking which effects depend on a signal returns the createEffect calls that read it rather than every file that names it. Atlas reads your createSignal, createMemo, and createEffect graph plus any SolidStart routes. Atlas is itself rendered with SolidJS through the OpenTUI renderer, so Solid's reactivity model is the model its own interface runs on.
Fixing a destructured prop that broke reactivity
Ask Atlas to fix a destructured prop that broke reactivity in SolidJS, which is the single most common Solid bug. Atlas computes a unified diff for every file edit and surfaces it for approval before writing, so the 2026 fix is reviewed line by line before it is applied.
SolidJS props are a getter-backed object, and destructuring them reads every value once, at setup, which silently severs reactivity. The component still renders, it just stops updating, and nothing in the type system complains. It is the bug every Solid developer writes at least once and every React-trained code generator writes constantly. Atlas can find and fix it, and because Atlas computes a unified diff for every file edit and surfaces it for approval before writing, you can confirm the fix preserves the read at the point of use rather than hoisting it back out. Atlas drafts a plan in a read-only plan agent and asks before switching to a build agent, so the components to be fixed are listed before any .tsx file changes.
Testing SolidJS with @solidjs/testing-library and vitest
Atlas can add tests with @solidjs/testing-library and run vitest behind a permission prompt. Every Atlas tool call is permission-gated against allow, ask, and deny rules before it runs, so in 2026 a SolidJS team allows the vitest run and gates everything else.
SolidJS testing has a wrinkle that catches people: because a component body runs exactly once, a test that expects a re-render on a prop change is testing the wrong thing, and the assertion has to follow the signal instead. Atlas can add tests with @solidjs/testing-library and run vitest behind a permission prompt, then feed failing assertions into the next iteration until the reactive behavior is actually covered. Atlas connects to Model Context Protocol servers and exposes their tools to the agent, and Atlas is extensible through plugins that contribute tools and hook into agent lifecycle events, which is how a team adds its own checks around the SolidStart build.
Reviewing the SolidJS diff and running prettier
Review the SolidJS diff, then have Atlas run prettier on the touched .tsx files. Atlas snapshots file changes as git patches so edits can be diffed and rolled back, which means a 2026 signal refactor that broke a createEffect can be undone in one step.
SolidJS diffs reward slow reading because the difference between correct and broken is often a pair of parentheses. A signal read as props.value inside JSX is reactive, and the same value pulled into a local const at the top of the component is not. Atlas computes a unified diff for every file edit and surfaces it for approval before writing, so those reads are visible in review. Running prettier on the touched .tsx files keeps the diff focused on the reactivity change. Atlas snapshots file changes as git patches so edits can be diffed and rolled back, and Atlas reads git branches, status, and diffs, and can stage and create commits on your behalf once vitest passes.
Running Atlas on SolidStart routes and keeping code local
Atlas reads any SolidStart routes alongside your createSignal, createMemo, and createEffect graph, and it fans out work to subagents that run in the foreground or in parallel background sessions. In 2026, Atlas can also build its code index with local Ollama embeddings, keeping Solid code off third-party servers.
SolidStart puts server code and client components in the same repository, so a Solid codebase often contains the parts a team is least willing to send anywhere. Atlas can build its code index with local Ollama embeddings, so the embedding pass runs on your own machine. Atlas fans out work to subagents that can run in the foreground or in parallel background sessions, which is how a destructured-prop audit runs across a whole component tree at once instead of file by file. Atlas lets you switch the active model and provider on the fly with favorites and recents, so a prettier pass and a subtle createMemo dependency question do not need the same model. Atlas ships a TUI theme system with a charcoal-and-blue default theme and many presets.
Getting started
- 01Run atlas in a Solid project with a vite.config.ts using vite-plugin-solid
- 02Let Atlas read your createSignal, createMemo, and createEffect graph plus any SolidStart routes
- 03Ask Atlas to fix a destructured prop that broke reactivity, which is the single most common Solid bug
- 04Let Atlas add tests with @solidjs/testing-library and run vitest behind a permission prompt
- 05Review the unified diff on the touched components before you approve
- 06Have Atlas run prettier on the touched .tsx files
Frequently asked questions
- does atlas work with solidjs
- Yes. Atlas runs in a Solid project with a vite.config.ts using vite-plugin-solid, and Atlas itself is a terminal-native TUI rendered with SolidJS through the OpenTUI renderer.
- why does destructuring props break reactivity in solid
- Solid props are getter-backed, so destructuring reads each value once and severs the reactive read. Ask Atlas to fix it, which is the single most common Solid bug.
- can an ai agent understand solid signals
- Atlas reads your createSignal, createMemo, and createEffect graph, and it indexes code by AST declarations using tree-sitter so a signal resolves to its real declaration.
- how do i test solidjs components with an ai coding agent
- Let Atlas add tests with @solidjs/testing-library and run vitest behind a permission prompt, feeding failing assertions into the next iteration.
- does atlas support solidstart
- Atlas reads any SolidStart routes alongside your signal graph, so a proposed change accounts for both the server routes and the client components.
- can i roll back a solidjs change made by an ai agent
- Atlas snapshots file changes as git patches so edits can be diffed and rolled back, including a signal refactor that broke a createEffect.
- is atlas safe on a private solidjs codebase
- Atlas can build its code index with local Ollama embeddings, keeping code off third-party servers, and every tool call is permission-gated against allow, ask, and deny rules.
Try Atlas in your terminal
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