Get a specific custom field for a job.
AI agents call get_job_custom_field to retrieve information from CATS MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves metadata about a job's custom field. It performs a simple data lookup without creating, modifying, deleting, or executing any operations. No financial transactions or code execution are involved. The blast radius of misuse is minimal—an agent could only access job field information it is authorized to view.
From the tool's definition Tool name 'get_job_custom_field' uses 'get', indicating retrieval. Description states 'Get a specific custom field for a job', which is a read-only query operation with no modification or side effects.
Attacks that exploit this kind of access
Get a specific custom field for a job. It is categorised as a Read tool in the CATS MCP Server MCP Server, which means it retrieves data without modifying state.
Register the CATS MCP Server MCP server in PolicyLayer and add a rule for get_job_custom_field: 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 CATS MCP Server. Nothing to install.
get_job_custom_field 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_job_custom_field 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_job_custom_field. 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_job_custom_field is provided by the CATS MCP Server MCP server (vanman2024/cats-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
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