Add a built-in architecture diagram template to the canvas.\n\n
AI agents use add_template_architecture to create or update resources in Excalidraw MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Excalidraw MCP Server environment.
The tool creates or modifies diagram content (adding template elements) in a reversible manner. It does not execute arbitrary code, delete data, move money, or trigger external operations beyond diagram manipulation. The addition of a template is a standard write operation on the canvas state, consistent with other Write-category tools like add_elements and create_diagram.
From the tool's definition add_template_architecture adds a built-in template to the canvas, which modifies the diagram state by inserting predefined architectural elements. This is a create/modify operation without destructive or executable side effects.
Documented attack patterns abuse exactly the kind of access add_template_architecture gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Excalidraw MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for add_template_architecture:
{
"version": "1",
"default": "deny",
"tools": {
"add_template_architecture": {
"limits": [
{
"counter": "add_template_architecture_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}add_template_architecture stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.
Free to start. No card required.
Add a built-in architecture diagram template to the canvas.\n\n. It is categorised as a Write tool in the Excalidraw MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Excalidraw MCP Server MCP server in PolicyLayer and add a rule for add_template_architecture: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Excalidraw MCP Server. Nothing to install.
add_template_architecture is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the add_template_architecture rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for add_template_architecture. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
add_template_architecture is provided by the Excalidraw MCP Server MCP server (scofieldfree/excalidraw-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 11 Excalidraw MCP Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
11 Excalidraw MCP Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.