Retrieve all contact fields from SparrowDesk
AI agents call list_contact_fields to retrieve information from SparrowDesk without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries and returns contact field metadata without creating, modifying, deleting, or executing any operations. It is a straightforward data retrieval function with no side effects, fitting the 'Read' category. The blast radius of misuse is minimal—exposing contact field definitions poses low risk to the system's integrity or user data confidentiality.
From the tool's definition Tool name 'list_contact_fields' and description 'Retrieve all contact fields from SparrowDesk' indicate a retrieval operation with no modification capability.
Attacks that exploit this kind of access
Retrieve all contact fields from SparrowDesk. It is categorised as a Read tool in the SparrowDesk MCP Server, which means it retrieves data without modifying state.
Register the SparrowDesk MCP server in PolicyLayer and add a rule for list_contact_fields: 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 SparrowDesk. Nothing to install.
list_contact_fields 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 list_contact_fields 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 list_contact_fields. 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.
list_contact_fields is provided by the SparrowDesk MCP server (sparrowdesk/sparrowdesk-mcp). 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.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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