This server does not currently have a deployable release on Glama. Follow the repository's setup instructions to install and configure it for your MCP client, including any required credentials and local dependencies.
MCP server that collapses browser act-then-observe into single tool calls. Every action returns its consequences — what appeared, disappeared, changed, or shifted — so agents see the effect of each action without a separate observation step.
~50% fewer tool calls. ~90% fewer tokens.
Tool | Description |
| Navigate to a URL. Returns a snapshot of interactive elements. |
| Take a snapshot of the current page. Returns interactive elements with |
| Click an element by ref. Returns consequences. |
| Fill a text input by ref. Returns consequences. |
| Press a key or key combination (e.g. |
| Scroll the viewport or a container. Detects DOM churn and layout shifts. |
| Wait for text to appear or a ref to become visible. Polls every 500ms. |
Related MCP server: Charlotte
Every interactive element gets a globally unique ref like @e1, @e5, @e23. Refs are stable across actions — use them to target clicks, fills, and scrolls. When an element leaves the DOM, its ref is never reused.
Refs resolve through a 3-tier system: backendNodeId (fast) → CSS domPath (fallback) → REF_STALE error.
Every action returns what changed:
appeared — new interactive elements in the DOM
disappeared — elements that left the DOM
changed — elements with modified properties (name, value, checked, etc.)
network — Fetch/XHR requests triggered by the action
dom-churn — remove-then-re-add pairs (e.g. React re-rendering an entire list on scroll)
layout-shift — CLS events without recent user input
browser_scroll detects rendering pathologies that are invisible to before/after snapshot diffing:
→ browser_scroll({ ref: "@e12", direction: "down", amount: "page" })
consequences: [
{ type: "dom-churn", churnCount: 36, desc: "DOM churn detected: 36 remove/re-add pairs" },
{ type: "layout-shift", cls: 0.042, shiftCount: 2, desc: "Layout shift: cls=0.042 (2 shifts)" }
]npm install
npm run buildLaunch Chrome automatically:
node dist/index.jsConnect to an existing Chrome instance:
node dist/index.js --cdp-url ws://127.0.0.1:9222/devtools/browser/...Add to claude_desktop_config.json:
{
"mcpServers": {
"browser-stream": {
"command": "node",
"args": ["/path/to/browser-stream/dist/index.js"]
}
}
}npm run dev # watch mode build
npm test # run tests
npm run test:watch # watch mode testssrc/
├── index.ts # CLI entrypoint, MCP server setup
├── types.ts # All shared types and response schemas
├── cdp/
│ └── client.ts # CDP connection (chrome-launcher + chrome-remote-interface)
├── state/
│ ├── ref-map.ts # @e ref registry with 3-tier resolution
│ ├── snapshot.ts # AX tree → ref assignment → compact line format
│ └── differ.ts # Pre/post snapshot diffing → consequences
├── actions/
│ ├── interactable.ts # Scroll-into-view + box model + center point
│ ├── stability.ts # DOM mutation debounce + network tracking + churn detection
│ └── engine.ts # Action orchestration (click, fill, scroll, etc.)
└── tools/
├── actions.ts # MCP tool registrations for actions
└── observation.ts # MCP tool registrations for snapshot/wait_forMIT
Recent tool additions, removals, and schema changes observed during successful MCP inspections.
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