delete_time_entry_external_reference

THE RISK

Critical Risk

Why delete_time_entry_external_reference needs a policy

This tool deletes time entry records, which cannot be undone. Time entries represent billable work history and financial/payroll records. Deletion is an irreversible data destruction operation, placing it in the Destructive category with high severity due to potential impact on billing, payroll, and audit trails.

From the tool's definition Tool name contains 'delete_time_entry' which irreversibly removes time tracking data. The sibling tool 'delete_time_entry' on this server confirms the destructive pattern.

Documented attack patterns abuse exactly the kind of access delete_time_entry_external_reference gives an agent:

POLICY

How to control delete_time_entry_external_reference

PolicyLayer is an MCP gateway — it sits between your AI agents and Harvest MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for delete_time_entry_external_reference:

policy.json

{
  "version": "1",
  "default": "deny",
  "hide": [
    "delete_time_entry_external_reference"
  ]
}

delete_time_entry_external_reference disappears from the agent's tool list entirely, and any attempt to call it is denied. The rest of the server keeps working.

Create a free account and register Harvest MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

RESTRICT THIS TOOL →

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EXPLORE

Related tools and policies

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All 12 Harvest MCP Server tools →

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Go deeper

Critical-risk tools in Harvest MCP Server → Every critical-risk tool this server exposes, in one view.
All critical-risk MCP tools → Every critical-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Blast radius → How much damage one compromised or confused agent can do — and how to bound it.
Tool call approval → Approval gates on individual tool calls: auto-allow, prompt, or deny.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about delete_time_entry_external_reference

What does the delete_time_entry_external_reference tool do? +

delete_time_entry_external_reference. It is categorised as a Destructive tool in the Harvest MCP Server MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.

How do I enforce a policy on delete_time_entry_external_reference? +

Register the Harvest MCP Server MCP server in PolicyLayer and add a rule for delete_time_entry_external_reference: 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 Harvest MCP Server. Nothing to install.

What risk level is delete_time_entry_external_reference? +

delete_time_entry_external_reference is a Destructive tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.

Can I rate-limit delete_time_entry_external_reference? +

Yes. Add a rate_limit block to the delete_time_entry_external_reference 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.

How do I block delete_time_entry_external_reference completely? +

Set action: deny in the PolicyLayer policy for delete_time_entry_external_reference. 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.

What MCP server provides delete_time_entry_external_reference? +

delete_time_entry_external_reference is provided by the Harvest MCP Server MCP server (tgmclaughlin/harvest-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Harvest MCP Server tool call.

Start from Harvest MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

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