Grainulator
Research that compiles.
What is Grainulator?
Grainulator is a Model Context Protocol (MCP) server that allows AI assistants like Claude, Cursor, and VS Code to research that compiles.
Research that compiles.
This server falls under the Coding Agents category on MCPgee, the world's largest MCP server directory with 33,000+ servers.
Features
- Research that compiles.
Use Cases
Maintainer
Works with
Installation
Manual Installation
npx grainulatorConfiguration
Configuration Details
claude_desktop_config.json
Performance
Response Metrics
Resource Usage
How to Set Up and Use Grainulator
Grainulator is a Claude Code plugin and MCP server framework for AI-powered research that produces verifiable, typed claims rather than raw text. It runs multi-pass investigation sprints using four specialized MCP servers — wheat (claims engine), mill (format conversion), silo (knowledge storage), and DeepWiki (codebase research) — and assigns each claim a confidence score (0–100) along with evidence typing (factual, constraint, risk, recommendation, estimate). Teams use it to research how systems work, challenge findings with adversarial testing, and generate structured briefs that compile into actionable deliverables.
Prerequisites
- Claude Code installed and running (Node.js 20+ required)
- Internet access for marketplace plugin installation
- An active Claude Code session with plugin support enabled
- Permissions granted for pre-compile and post-claim hooks in `.claude/settings.json`
Add Grainulator from the plugin marketplace
Use Claude Code's plugin marketplace command to add Grainulator from its GitHub repository.
claude plugin marketplace add https://github.com/grainulation/grainulator.git
claude plugin install grainulatorAlternative: clone and install locally
If the marketplace is unavailable or you want a local copy, clone the repository directly into the Claude plugins directory.
git clone https://github.com/grainulation/grainulator.git ~/.claude/plugins/grainulator
claude plugin add ~/.claude/plugins/grainulatorGrant hook permissions
On first use, Claude Code will prompt you to allow pre-compile and post-claim hooks. Accept these, or pre-approve them in your project settings to avoid repeated prompts.
Initialize Grainulator in your project
Run the `/init` slash command inside Claude Code to set up Grainulator's knowledge silo and configure the MCP servers for your project.
/initStart a research sprint
Use the `/research` command or natural language to kick off a multi-pass investigation. Grainulator will autonomously gather, type, and score claims.
/research how does our authentication system handle token refresh?Grainulator Examples
Client configuration
For team deployments, add Grainulator to `.claude/settings.json` so it is enabled automatically for all team members.
{
"enabledPlugins": ["grainulator@grainulation-marketplace"]
}Prompts to try
Use these natural language triggers and slash commands to exercise Grainulator's research and adversarial testing capabilities.
- "Research how our auth system works using grainulator."
- "/challenge r003" — adversarially test a specific claim by ID
- "/blind-spot" — identify gaps in the current research
- "/brief" — generate a structured brief from all collected claims
- "What are we missing in our analysis of the payment flow?"Troubleshooting Grainulator
Slash commands like `/research` are missing after installation
Restart Claude Code after installing the plugin. Commands are registered at startup, so an existing session will not have them.
MCP servers (wheat, mill, silo) disconnect during a sprint
Run `/healthcheck` inside Claude Code to diagnose which MCP server has disconnected. Re-add it manually with `claude mcp add` using the server name shown in the healthcheck output.
Hook permission prompts interrupt every research session
Pre-approve hooks in your project's `.claude/settings.json` by adding the relevant hook entries. Alternatively, approve at the user settings level so it applies to all projects.
Frequently Asked Questions about Grainulator
What is Grainulator?
Grainulator is a Model Context Protocol (MCP) server that research that compiles. It connects AI assistants to external tools and data sources through a standardized interface.
How do I install Grainulator?
Follow the installation instructions on the Grainulator GitHub repository. Clone the repo, install dependencies, and add the server config to your AI client.
Which AI clients work with Grainulator?
Grainulator works with all major MCP-compatible AI clients including Claude Desktop, Claude Code, Cursor, VS Code (GitHub Copilot), Windsurf, and Cline.
Is Grainulator free to use?
Yes, Grainulator is open source and available under the MIT license. You can use it freely in both personal and commercial projects.
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Set Up Grainulator in Your Editor
Choose your AI client for step-by-step setup instructions.
Quick Config Preview
Add this to your claude_desktop_config.json or .cursor/mcp.json
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