v0.28.0

New Features

• MCP server - Added agent-browser mcp, a stdio Model Context Protocol server with typed tools, paginated discovery, protocol negotiation, and startup tool profiles. The default core profile keeps context small, while --tools all exposes full CLI parity and composed profiles such as core,network,react are supported (#1454)
• Plugin system - Added out-of-process plugin support over the agent-browser.plugin.v1 stdio protocol, with plugin add/list/show/run, manifest discovery, npm and GitHub refs, credential providers, browser provider plugins, launch mutators, custom command capabilities, config and env registry support, and capability-scoped policy gates (#1452)

Infrastructure

• Added context footprint eval coverage for CLI skills, MCP core, and MCP full-profile surfaces, plus MCP parity tests to keep tool behavior aligned with the CLI (#1454)

Contributors

• @ctate