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How to integrate Eraser MCP with Atomic Agent

Connect Atomic Agent to Eraser MCP. Generate network diagram for microservices architecture, search workspace for authentication flow diagrams, and more using natural language, with authentication handled for you.

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Eraser MCP is a workspace for creating and managing technical diagrams and structured documents. It helps teams organize, version, and export diagrams with collaboration-focused tooling.

42 Tools

Introduction

Atomic Agent is an open-source AI agent that runs on your machine and supports local models through llama.cpp. Connect it to 1,500+ apps through Composio, including Eraser.

This guide uses Atomic Agent's built-in Composio integration. You need Atomic Agent v0.5.6 or later, your own Composio API key, and a Eraser account. See the Atomic Agent documentation for installation instructions.

Also integrate Eraser MCP with

ChatGPTClaude CoworkHermes

How Atomic Agent connects to Eraser

Atomic Agent connects to Composio's Tool Router over Streamable HTTP MCP. It discovers the tools needed for your request, and Composio handles account authentication.

Execution and account-connection tools follow Atomic Agent's configured approval policy. Review any approval prompt before allowing an action on your connected account.

Connect Eraser to Atomic Agent

  1. Sign up or sign in to the Composio dashboard. Copy your API key.
  2. In Atomic Agent, open the Integrations tab and select Composio. Select API key, press e, paste the key, and press Enter. The tools become available immediately, without a restart.
  3. Ask Atomic Agent to do something in Eraser. It searches Composio for the right tool.
  4. On first use, open the sign-in link returned in the chat. Connect your Eraser account, then return to Atomic Agent to continue.

Headless setup

Add the following line to ~/.atomic-agent/.env, replacing YOUR_COMPOSIO_API_KEY with your key. Start Atomic Agent after saving the file.

bash
COMPOSIO_API_KEY=YOUR_COMPOSIO_API_KEY

What is the Eraser MCP server, and what's possible with it?

The Eraser MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Eraser account. It provides structured and secure access to your technical diagrams, documents, files, folders, and presets, so your agent can create, find, update, export, and organize workspace content on your behalf.

  • Diagram creation and editing: Have your agent generate diagrams from natural-language prompts, revise their content or appearance, retrieve their code, and remove diagrams you no longer need.
  • Technical document management: Let the agent create documents from prompts, read or rewrite their Markdown content, clear document bodies, and export finished documents.
  • Workspace search and organization: Direct your agent to search across files and diagrams, create or organize folders, rename files, adjust sharing settings, and archive files.
  • Diagram and file exports: Instruct your agent to export diagrams as PNG or JPEG images, export document content, or get Eraser file links for PDF export.
  • Reusable styles and references: Have your agent create and manage presets, attach templates or reference files, update preset details, and publish new template or reference versions.

Use Eraser from Atomic Agent

With your account connected, ask Atomic Agent to work with Eraser in natural language. You can connect more apps through the same Composio integration as you need them.

Visit the Atomic Agent website or inspect the Atomic Agent source code.

Troubleshooting

Why is my API key rejected?

Copy the key directly from the Composio dashboard. Atomic Agent requires ASCII characters because it sends the key in an HTTP header. Remove any extra characters introduced when copying.

Why are Composio tools unavailable after saving a key?

Check that you use Atomic Agent v0.5.6 or later and that Composio is enabled in your configuration. A "composio": { "enabled": false } setting disables the integration while keeping the saved key on disk.

Does Composio have a free plan?

The Hobby plan includes 100,000 tool calls per month. Composio-managed OAuth apps have a lower included allowance. See Composio pricing for the current limits that apply to your connection.

TOOLS

Supported Tools

Every Eraser MCP action and event your agent gets out of the box.

Add or remove template or reference

Attach or detach an EXISTING file as a template (style anchor) or reference (terminology/concept anchor) of a preset.

Create diagram

PREFERRED for creating a diagram from a natural-language prompt — Eraser's AI picks the diagram type, generates the DSL, and renders it.

Create document

PREFERRED for populating a document from a natural-language prompt — Eraser's AI generates the markdown.

Create file

Create an empty file, or duplicate an existing file when sourceFileId is provided.

Create folder

Create a new folder.

Create preset

Create a new preset (the team-level container for AI styling: templates, references, and rules).

Create template or reference

Create a new template (style anchor) or reference (terminology/concept anchor) file and, when `presetId` is provided, attach it to that preset in a single call.

Delete diagram

Delete a diagram from a file.

Delete document

Clear a file's document body to an empty markdown document.

Delete file

Archive a file.

Delete folder

Delete a folder.

Delete preset

Delete a preset.

Export diagram

Render a canvas diagram to PNG or JPEG and return a temporary image URL.

Export document

Export a file's markdown document body as a downloadable artifact.

Export file

Returns the Eraser file URL for PDF export.

Get diagram

Fetch a diagram's metadata and DSL/JSON code.

Get document

Fetch the full markdown body of a file's document.

Get file

Fetch a file's metadata, document outline (headers), and the list of diagrams in it.

Get folder

Fetch a folder by id.

Get me

Fetch the current user, active team, and team memberships.

Get preset

Fetch a preset including its rules, templates, and references.

Get template or reference

Fetch a template/reference's metadata, document outline, and diagram list.

List diagrams

List the diagrams contained in a file.

List files

List files in the team workspace, optionally scoped to a folder.

List folders

List folders.

List presets

List the team's presets.

List teams

List the teams the current user belongs to (OAuth only).

Manually create diagram

ADVANCED — most callers should use create_diagram instead.

Manually create document

ADVANCED — most callers should use create_document instead.

Manually update diagram

ADVANCED — most callers should use update_diagram instead.

Manually update document

ADVANCED — most callers should use update_document instead.

Manually update file

Replace a file's document markdown and/or diagram code in one call.

Publish template or reference

Publish a new version of a template/reference file.

Search

Full-text and semantic search across files or diagrams.

Select team

Set the active team for the session when the user belongs to multiple teams (OAuth only).

Update diagram

USE THIS for any user request that describes the change in natural language — verbs like 'add', 'remove', 'change', 'rename', 'recolor', 'make it more X', etc.

Update document

USE THIS for any user request that describes the change in natural language — verbs like 'add a section', 'rewrite the intro', 'fix the typo', 'remove the deprecated paragraph', etc.

Update file

Update file metadata (title, folder, sharing).

Update folder

Rename or move a folder, or bulk-apply a link-sharing setting to every file inside it (recursively).

Update preset

Rename a preset or update its metadata (`name`, `description`, `isDefault`).

Update rules

Add, update, or remove rules on a preset in a single batched call.

Update template or reference

Rename a template or reference file.

FRAMEWORKS

How to build Eraser MCP Agent with another framework

ChatGPT logo

ChatGPT

Use Eraser MCP with ChatGPT

Claude Cowork logo

Claude Cowork

Use Eraser MCP with Claude Cowork

Hermes logo

Hermes

Use Eraser MCP with Hermes

FAQ

Frequently asked questions

With a standalone Eraser MCP server, the agents and LLMs can only access a fixed set of Eraser tools tied to that server. However, with the Composio Tool Router, agents can dynamically load tools from Eraser and many other apps based on the task at hand, all through a single MCP endpoint.

Yes, you can. Atomic Agent fully supports MCP integration. You get structured tool calling, message history handling, and model orchestration while Tool Router takes care of discovering and serving the right Eraser tools.

Yes, absolutely. You can configure which Eraser scopes and actions are allowed when connecting your account to Composio. You can also bring your own OAuth credentials or API configuration so you keep full control over what the agent can do.

All sensitive data such as tokens, keys, and configuration is fully encrypted at rest and in transit. Composio is SOC 2 Type 2 compliant and follows strict security practices so your Eraser data and credentials are handled as safely as possible.

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