AI agents use update_kb_article to create or update resources in Now Sdk Ext — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Now Sdk Ext environment.
This tool creates or modifies data (a knowledge article) in a reversible manner. Updates can typically be undone through version history or rollback. It does not delete data irreversibly (Destructive), execute arbitrary code (Execute), move money (Financial), or retrieve data without side effects (Read).
From the tool's definition Tool name is 'update_kb_article' and description states 'Update an existing knowledge article', which modifies existing data reversibly.
Documented attack patterns abuse exactly the kind of access update_kb_article gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Now Sdk Ext, and nothing reaches the server without passing your rules. This is the rule we recommend for update_kb_article:
{
"version": "1",
"default": "deny",
"tools": {
"update_kb_article": {
"limits": [
{
"counter": "update_kb_article_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}update_kb_article 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 knowledge article. It is categorised as a Write tool in the Now Sdk Ext MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Now Sdk Ext MCP server in PolicyLayer and add a rule for update_kb_article: 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 Now Sdk Ext. Nothing to install.
update_kb_article 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 update_kb_article 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 update_kb_article. 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.
update_kb_article is provided by the Now Sdk Ext MCP server (sonisoft-cnanda/now-sdk-ext-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Now Sdk Ext, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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86 Now Sdk Ext tools catalogued and risk-classified — across an index of 43,000+ MCP servers.