Get the full content of a knowledge article by sys_id, including the HTML body text.
AI agents call get_kb_article to retrieve information from Now Sdk Ext without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves knowledge article content by identifier and returns it (including HTML body text). This is a straightforward read operation with no side effects. Knowledge articles are typically informational content, and access is often already scoped by ServiceNow permissions. Misuse would expose information rather than cause operational damage, warranting low severity.
From the tool's definition Tool name 'get_kb_article' and description 'Get the full content of a knowledge article by sys_id' indicate retrieval of existing data without modification.
Documented attack patterns abuse exactly the kind of access get_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 get_kb_article:
{
"version": "1",
"default": "deny",
"tools": {
"get_kb_article": {}
}
}get_kb_article is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Get the full content of a knowledge article by sys_id, including the HTML body text. It is categorised as a Read tool in the Now Sdk Ext MCP Server, which means it retrieves data without modifying state.
Register the Now Sdk Ext MCP server in PolicyLayer and add a rule for get_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.
get_kb_article is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the get_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 get_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.
get_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.