Plasmate Documentation - Plasmate Docs | The Better Browser for AI Agents

# Plasmate > Open-source browser engine for AI agents. HTML in, structured Semantic Object Model out. Plasmate is a Rust headless-browser engine that compiles web pages into a Semantic Object Model (SOM): JSON with typed regions, interactive elements, stable references, actions, and content. It runs as a CLI, daemon, native MCP server, AWP server, and CDP compatibility server. ## Release status - Latest published Rust engine: v0.5.1. - Next candidate: v0.6.0; it is not released or available as an OCI image yet. - The v0.6.0 MCP Registry declaration must not be published until its newly labeled GHCR image is built and anonymously pullable. - Apache-2.0 licensed; source: https://github.com/plasmate-labs/plasmate. ## Protocol surfaces - MCP: the native server advertises its current tools through `tools/list`. Capabilities include stateless fetch/extraction/discovery, cache/session/trace inspection, screenshot and stateful page interaction, cookies, and validation-only replay. Do not rely on a hard-coded tool count. - AWP: the foundational v0.1 core methods are `awp.hello`, `session.create`, `session.close`, `page.navigate`, `page.observe`, `page.act`, and `page.extract`. The current wire handler also includes session-listing, network-interception, plugin, cookie, and proxy-pool extensions. Primitive click/type/select/scroll/toggle/clear operations are `page.act` actions. - CDP: a compatibility layer for supported Puppeteer/CDP workflows. ## Output-size evidence Output reduction is page-, configuration-, corpus-, and serialization-dependent. Retained v0.5.1 observational public-web snapshots recorded: - non-JavaScript: median serialized-byte ratio 9.98x over 83 successful inputs from 98 attempted URLs; - JavaScript: median serialized-byte ratio 9.32x over 82 successful inputs from 98 attempted URLs. Blocked and failed inputs remain in the denominator. These byte ratios are not universal token savings, cost savings, latency, or task-success