tool_add_text_annotation · origin- MCP: Risk & Policy

WHAT IT DOES

What tool_add_text_annotation does on origin-MCP

AI agents use tool_add_text_annotation to create or update resources in origin-MCP — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your origin-MCP environment.

WHY IT NEEDS A POLICY

Why tool_add_text_annotation needs a policy

Adding a text annotation modifies the graph by inserting new content, but this is a non-destructive, reversible operation typical of write actions. The user can remove or edit the annotation. There are no financial implications, no code execution, and no data deletion. The blast radius if misused (e.g., adding misleading labels to scientific plots) is limited to the presentation layer and can be easily corrected.

From the tool's definition Tool description states 'Add a text annotation at specified coordinates on a graph' — this creates/modifies a graph element (text annotation) which is a reversible change to the visualization.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

tool_add_text_annotation Rate-limited

tool_add_text_annotation 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.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "tool_add_text_annotation": {
      "limits": [
        {
          "counter": "tool_add_text_annotation_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches origin-MCP, so you can run agents against it safely.

FAQ

Questions about tool_add_text_annotation

What does the tool_add_text_annotation tool do? +

Add a text annotation at specified coordinates on a graph. It is categorised as a Write tool in the origin-MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on tool_add_text_annotation? +

Register the origin- MCP server in PolicyLayer and add a rule for tool_add_text_annotation: 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 origin-MCP. Nothing to install.

What risk level is tool_add_text_annotation? +

tool_add_text_annotation is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit tool_add_text_annotation? +

Yes. Add a rate_limit block to the tool_add_text_annotation 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.

How do I block tool_add_text_annotation completely? +

Set action: deny in the PolicyLayer policy for tool_add_text_annotation. 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.

What MCP server provides tool_add_text_annotation? +

tool_add_text_annotation is provided by the origin- MCP server (zhang-923-ze/origin-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.