v3.0.0

Added

• Streamable HTTP transport: set MCP_PRINTER_TRANSPORT=http to serve MCP at POST /mcp (MCP_PRINTER_HTTP_HOST, MCP_PRINTER_HTTP_PORT). It is stateless and has no authentication, so it must sit behind an authenticating proxy. stdio remains the default
• print_content tool: print a document whose text the client sends (markdown, html, code or text) without a file on the server
• print_pdf tool: print a PDF sent as base64 (up to 5 MB)
• MCP_PRINTER_ENABLE_FILE_TOOLS (default true): set to false to hide print_file, get_page_meta and the print-changed prompt
• MCP_PRINTER_CHROME_NO_SANDBOX (default false): start Chrome with --no-sandbox, needed when running as root in a container
• Containerfile for running the HTTP server in a rootless container with the CUPS client commands, Chromium, CJK fonts and the Sarasa Mono K code font. Release images are published to ghcr.io/hnjae/mcp-printer as 3.0.0, 3.0, 3 and latest, so :3 follows every 3.x release
• sides, media, orientation and quality parameters on print_content, print_pdf and print_file, replacing the need to write sides=…, media=…, landscape and cupsPrintQuality=… in the free-form options string. They override the same settings in options and MCP_PRINTER_DEFAULT_OPTIONS. get_page_meta accepts sides and media. options remains for other CUPS options
• list_printers reports the sides, media and quality values each printer accepts, read from lpoptions -l. It offers jis_b5_182x257mm and jis_b6_128x182mm under that name on every printer that can print the size, whether or not the printer lists it itself, and sends the printer's own choice or, failing that, Custom.182x257mm / Custom.128x182mm. A printer without its own listing gets the size when it lists A4 (B5) or A5 (B6) and custom page sizes
• render parameter (markdown, code or none) on print_file and get_page_meta: renders the file that way whatever its extension, so Markdown can be rendered from a file without a Markdown extension. Omitted, the extension and the MCP_PRINTER_AUTO_RENDER_* settings decide as before
• Documents are rendered on the page size of the call's media: A3 to A6, Letter, Legal, Executive, Oficio, FanFoldGermanLegal, the JIS B5/B6 names, IPP names that carry their size, a printer's own names made of dimensions such as 4x6 (inches) and 215x345mm, and Custom.<W>x<H>. Any other name renders on A4. A size the document sets itself (HTML @page, Markdown front matter) wins
• Code and plain text are set in ui-monospace, then Sarasa Mono K, then the system's monospace font, so Korean and other CJK comments stay aligned

Changed

• BREAKING: the runtime and tooling moved to Bun (bun >=1.3.14); pnpm, ESLint, Prettier and Vitest were replaced by Bun, Biome and prek. The sources run directly with no build step or dist/ directory, so point MCP client configurations at src/index.ts instead of dist/index.js
• BREAKING: Markdown files whose front matter selects a non-YAML engine, such as ---js, are rejected. gray-matter evaluated such front matter as code
• BREAKING: rendered documents are laid out on A4 instead of US Letter when the call has no media. Pass media: Letter to keep Letter
• BREAKING: print_file and get_page_meta no longer accept force_markdown_render and force_code_render; use render
• BREAKING: print_content, print_file and get_page_meta no longer accept line_numbers, color_scheme, font_size or line_spacing. The MCP_PRINTER_CODE_* settings control how code looks
• BREAKING: MCP_PRINTER_AUTO_DUPLEX is no longer read; set MCP_PRINTER_DEFAULT_OPTIONS=sides=two-sided-long-edge instead
• BREAKING: MCP_PRINTER_ENABLE_PROMPTS is no longer read; the print-changed prompt follows MCP_PRINTER_ENABLE_FILE_TOOLS
• BREAKING: MCP_PRINTER_FALLBACK_ON_RENDER_ERROR is no longer read; a failed rendering always fails that item, and render: none prints a file as it is
• BREAKING: MCP_PRINTER_CODE_EXCLUDE_EXTENSIONS is no longer read; use render: none for one file or MCP_PRINTER_AUTO_RENDER_CODE=false for all
• Markdown is printed without filled backgrounds: code blocks are outlined instead, block quotes keep their left bar
• File path validation now happens once, where a path enters the print flow, instead of again inside the code and Markdown renderers

Fixed

• The sheet estimate and PAGE_COUNT_CONFIRMATION_REQUIRED check assumed duplex whenever MCP_PRINTER_AUTO_DUPLEX was on, even when the call printed one-sided. It now follows the effective sides setting
• A Markdown file that was not rendered as Markdown (MCP_PRINTER_AUTO_RENDER_MARKDOWN=false) was rendered as code instead. It is now printed as it is; render: code renders it as code
• CUPS output is parsed under a fixed locale, so a translated CUPS no longer breaks printer and queue parsing
• Every CUPS command has a time limit (10 seconds for queries, 60 seconds for submissions and changes), so an unreachable CUPS server no longer leaves a call waiting indefinitely
• HTML, code and plain-text PDFs no longer carry Chrome's date and the path of a temporary file as header and footer, and rendered code starts with the file's name instead of its full path