Update an existing tool in the mcpGraph
AI agents use updateGraphTool to create or update resources in mcpGraph — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your mcpGraph environment.
This tool modifies existing graph tool definitions, which is a reversible write operation. It does not execute arbitrary code (Execute), delete data (Destructive), move money (Financial), or retrieve data without side effects (Read).
From the tool's definition Tool name 'updateGraphTool' and description 'Update an existing tool in the mcpGraph' indicate modification of existing data/configurations without deletion.
Documented attack patterns abuse exactly the kind of access updateGraphTool gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and mcpGraph, and nothing reaches the server without passing your rules. This is the rule we recommend for updateGraphTool:
{
"version": "1",
"default": "deny",
"tools": {
"updateGraphTool": {
"limits": [
{
"counter": "updategraphtool_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}updateGraphTool 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.
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Update an existing tool in the mcpGraph. It is categorised as a Write tool in the mcpGraph MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the mcpGraph MCP server in PolicyLayer and add a rule for updateGraphTool: 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 mcpGraph. Nothing to install.
updateGraphTool 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 updateGraphTool 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 updateGraphTool. 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.
updateGraphTool is provided by the mcpGraph MCP server (teamsparkai/mcpgraph). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from mcpGraph, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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13 mcpGraph tools catalogued and risk-classified — across an index of 43,000+ MCP servers.