Open-Source Browser MCP Charlotte 0.8.0: Remote Server Support, Slashes Token Usage by 96%
ticktockbent · reddit · 2026-08-13
Open-source browser MCP server Charlotte launched version 0.8.0, introducing a remote HTTP server mode. Developers can now spin up an instance behind a cloudflared tunnel with an auth token via a single Docker command, and paste it directly into claude.ai as a custom MCP connector.
Core Strength: Extreme Token Efficiency
Instead of dumping raw accessibility trees like Playwright MCP, Charlotte provides agents with a structured understanding of web pages. Benchmarks show that on a find-and-click task, Charlotte uses only 421 tokens (vs. 13,022 for Playwright MCP). On a read-the-page task, it costs 7,812 tokens (vs. 12,601).
Known Weaknesses & Security Features
For multi-step form fill tasks, Charlotte is currently 5x more expensive than Playwright MCP because every mutating call returns the full page representation. The author noted a fix is in progress. The new release also packs security features including an SSRF navigation guard, DNS rebind guard, and an OAuth facade. The creator is actively seeking testers for complex SPAs, authenticated flows, and edge cases.
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