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GroupDocs.Viewer.Mcp AGENTS.md

An MCP server for GroupDocs.Viewer for .NET that lets AI clients inspect documents and render pages as images. It supports common office files, PDFs, web pages, and many other formats.

In plain words
What is it for?
Use it to get a document's type, page count, and page dimensions, or render a selected page to a PNG. It also supports password-protected documents.
Why use it?
It lets an AI client inspect document details or see rendered pages without requiring a separate document-viewing workflow.

Instructions file for CodexOpenCode

0 1mo ago A scan 1,374 tokens original MIT
View the source file groupdocs-viewer/GroupDocs.Viewer.Mcp
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add instructions/groupdocs-viewer/groupdocs.viewer.mcp/agents-md
Clone the repo
git clone --depth 1 https://github.com/groupdocs-viewer/GroupDocs.Viewer.Mcp

Made for: Codex, OpenCode.

Per session 1,374 This file is loaded in full into every session.
When invoked 1,374 The same file — it is already loaded in full.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.01374 $0.01374
Opus 5 $0.00687 $0.00687
Sonnet 5 $0.00275 $0.00275
Haiku 4.5 $0.00137 $0.00137

Measured yesterday against content hash ac67df7735ba, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

GroupDocs.Viewer.Mcp AGENTS.md scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured yesterday.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

AGENTS.md · 100 lines

How it starts

The opening of the file, as written. The whole thing — 100 lines — stays where its author put it; the contents beside it link to each section on GitHub.

AGENTS.md — Guide for AI coding agents

Brief orientation for AI coding agents (Claude Code, Copilot, Cursor, Aider, Amp, Codex) working in this repository.

What this repo is

A standalone MCP server for GroupDocs.Viewer for .NET — exposes document rendering and view-info inspection as AI-callable tools via the Model Context Protocol.

Published to NuGet as GroupDocs.Viewer.Mcp with the McpServer package type, and to ghcr.io/groupdocs-viewer/viewer-net-mcp + docker.io/groupdocs/viewer-net-mcp as a container image.

MCP tools exposed

Tool Description
RenderPage Render a single document page as a PNG image. Returns a CallToolResult with both a TextContentBlock (saved file path: <source-stem>_page<N>.png) and an ImageContentBlock (PNG bytes inline as image/png). Supports PDF, Word, Excel, PowerPoint, ODT, RTF, HTML, and 170+ more formats; takes optional page (1-based, default 1) and password.
GetViewInfo Return file type, page count, and per-page dimensions as JSON. No rendering performed. Optional password for protected documents.

RenderPage is the only tool in the GroupDocs MCP family that returns a CallToolResult directly (rather than Task<string>) — it embeds the rendered image inline as an ImageContentBlock so AI clients can display the page without a separate fetch.

Folder layout

src/                                           ← all projects + sln + Directory.Build.props
  GroupDocs.Viewer.Mcp/
    Program.cs                                 ← host bootstrap + stdio transport
    ViewerLicenseManager.cs                    ← applies GroupDocs.Total license
    Tools/
      RenderPageTool.cs                        ← [McpServerTool] — RenderPage (returns CallToolResult)
      GetViewInfoTool.cs                       ← [McpServerTool] — GetViewInfo (returns JSON string)
    .mcp/
      server.json                              ← NuGet.org reads this to generate mcp.json snippet
    GroupDocs.Viewer.Mcp.csproj                ← PackageType=McpServer + ToolCommandName
  GroupDocs.Viewer.Mcp.Tests/
  GroupDocs.Viewer.Mcp.sln
  Directory.Build.props
build/
  dependencies.props                           ← single source of truth for all versions
changelog/                                     ← one MD file per change (see changelog/README.md)
docker/
  Dockerfile                                   ← multi-stage, runtime on aspnet:10.0
  docker-compose.yml
.github/workflows/                             ← build_packages.yml, run_tests.yml, publish_prod.yml, publish_docker.yml

Read the full file on GitHub · 100 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. yesterday First seen · 100 lines · 1,374 tokens per session scan A ac67df7735ba

Subscribe to this mod's changes

GroupDocs.Viewer.Mcp AGENTS.md is an instructions file published in the GitHub repository groupdocs-viewer/GroupDocs.Viewer.Mcp (0 stars, last pushed 1mo ago), licensed MIT. It adds 1,374 tokens to every session, about $0.0069 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

Documentsai-agentsclaudecursordocument-processingdocument-viewerdotnet
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