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rust-browser-connection

Rust MCP/noVNC bridge for docker-git: one project = one Chromium container visible in noVNC and controlled through MCP/CDP.

Install

cargo install --git https://github.com/ProverCoderAI/rust-browser-connection --branch main --locked --bins

Installs two binaries:

docker-git-browser-connection  # start/status browser container
browser-connection             # MCP stdio server for Codex/Hermes

Start browser manually

docker-git-browser-connection start --project dg-my-project

Output contains:

Container: dg-my-project-browser
noVNC: http://...
CDP: http://...

Check status:

docker-git-browser-connection status --project dg-my-project

Codex MCP config

~/.codex/config.toml:

[mcp_servers.playwright]
command = "browser-connection"
args = ["--project", "dg-my-project"]

Use browser-connection, not npx @playwright/mcp. The MCP server starts/reuses the same Rust-managed browser container automatically.

Hermes MCP config

~/.hermes/config.yaml:

mcp_servers:
  playwright:
    command: browser-connection
    args: ["--project", "dg-my-project"]
    timeout: 120
    connect_timeout: 60

MCP tools

browser_navigate(url)
browser_snapshot()
browser_evaluate(expression)
browser_click(selector)
browser_type(selector, text)
browser_press_key(key)
browser_take_screenshot(full_page?)

Smoke test

printf '%s\n' \
  '{"jsonrpc":"2.0","id":1,"method":"initialize","params":{"protocolVersion":"2024-11-05","capabilities":{},"clientInfo":{"name":"probe","version":"0"}}}' \
  '{"jsonrpc":"2.0","method":"notifications/initialized","params":{}}' \
  '{"jsonrpc":"2.0","id":2,"method":"tools/list","params":{}}' \
| browser-connection --project dg-my-project --no-start-browser

Expected: server browser-connection and tools like browser_navigate, browser_snapshot, browser_evaluate.

Notes

  • Container name: <project>-browser, e.g. dg-my-project-browser.
  • The binary auto-detects Docker via /var/run/docker.sock or tcp://host.docker.internal:2375.
  • If container:<project> network is unavailable, it falls back to bridge mode and prints reachable noVNC/CDP URLs.
  • Invariant: MCP and noVNC operate on the same Chromium session; no second Playwright browser is started.

Development

cargo fmt --check
cargo check --locked --bins
cargo test --locked
cargo clippy --locked --all-targets -- -D warnings