// SCAN REPORT

Harvest MCP Server

21 tools. 8 can modify or destroy data without limits.

1 destructive tool with no built-in limits. Policy required.

Last updated: 11 Jun 2026

8 can modify or destroy data

13 read-only

21 tools total

Community server · catalogue entry verified 11/06/2026

How to control Harvest MCP Server ↓

TOOL MAP

Read (13) Write / Execute (7) Destructive / Financial (1)

MOST DANGEROUS TOOLS

Critical Risk

Destructive · High delete_estimate Deletion of estimates cannot be undone and represents irreversible data loss. Execute · Medium start_timer The tool executes a command that changes application state (starts timer tracking in Harvest). Write · Low stop_timer Stopping a timer modifies the state of an active time entry (changes it from running to stopped). Write · Medium create_estimate Creating an estimate is a reversible write operation that generates new data in the Harvest system.

8 of Harvest MCP Server's 21 tools can modify, destroy, or commit something on every call — and an agent calls them with no built-in limits.

HOW TO CONTROL HARVEST MCP SERVER

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

Deny destructive operations

{
  "delete_estimate": {
    "deny_if": [
      {
        "conditions": [],
        "on_deny": "Blocked by default. Requires approval."
      }
    ]
  }
}

Destructive tools should never be available to autonomous agents without human approval.

Rate limit write operations

{
  "stop_timer": {
    "limits": [
      {
        "counter": "stop_timer_per_hour",
        "window": "hour",
        "max": 30,
        "scope": "grant"
      }
    ]
  }
}

Prevents bulk unintended modifications from agents caught in loops.

Cap read operations

{
  "get_client_details": {
    "limits": [
      {
        "counter": "get_client_details_per_minute",
        "window": "minute",
        "max": 60,
        "scope": "grant"
      }
    ]
  }
}

Controls API costs and prevents retry loops from exhausting upstream rate limits.

Create a free account and register Harvest MCP Server — nothing to install.
Add these rules — paste them, or build them visually. Tune the limits to your setup.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

ENFORCE POLICY ON HARVEST →

Free to start. No card required.

ALL 21 HARVEST MCP SERVER TOOLS

DESTRUCTIVE 1 tools

Destructive delete_estimate Delete an estimate.

EXECUTE 1 tools

Execute start_timer Start a new timer.

WRITE 6 tools

Write stop_timer Stop a running timer. Write change_estimate_state change_estimate_state Write create_estimate create_estimate Write create_time_entry create_time_entry Write send_estimate_message send_estimate_message Write update_estimate update_estimate

READ 13 tools

Read get_client_details Get detailed information about a specific client. Read get_estimate_by_number get_estimate_by_number Read get_estimate_details Retrieve details for a specific estimate. Read get_project_details Get detailed information about a specific project. Read get_unsubmitted_timesheets get_unsubmitted_timesheets Read get_user_details Retrieve details for a specific user. Read list_clients List clients with optional filtering. Read list_estimate_messages list_estimate_messages Read list_estimates list_estimates Read list_projects List projects with optional filtering. Read list_tasks List all tasks with optional filtering. Read list_time_entries list_time_entries Read list_users List all users in your Harvest account.

RELATED SERVERS

Other MCP servers with similar tools — same risk classification, starter policies for each.

FAQ

Can an AI agent delete data through the Harvest MCP Server MCP server? +

Yes. The Harvest MCP Server server exposes 1 destructive tools including delete_estimate. These permanently remove resources with no undo. PolicyLayer blocks destructive tools by default so they never reach the upstream server.

How do I prevent bulk modifications through Harvest MCP Server? +

The Harvest MCP Server server has 6 write tools including stop_timer, change_estimate_state, create_estimate. Set a rate limit in your policy -- for example, 10 calls per hour prevents an agent from making more than 10 modifications per hour. PolicyLayer enforces this at the gateway, before calls reach Harvest MCP Server.

How many tools does the Harvest MCP Server MCP server expose? +

21 tools across 4 categories: Destructive, Execute, Read, Write. 13 are read-only. 8 can modify, create, or delete data.

How do I enforce a policy on Harvest MCP Server? +

Register the Harvest MCP Server MCP server in PolicyLayer, apply the suggested rules above (adjust the limits to your use case), and point your AI client at the PolicyLayer proxy URL instead of the server directly. Your agents keep the same tools; PolicyLayer evaluates every call against policy before it executes. Nothing to install, live in minutes.

Enforce policy on every Harvest MCP Server tool call.

Deterministic rules across all 21 Harvest MCP Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.

ENFORCE POLICY ON HARVEST →

Free to start. No card required.

21 Harvest MCP Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.

Harvest MCP Server

// TOOL MAP

// MOST DANGEROUS TOOLS

// HOW TO CONTROL HARVEST MCP SERVER

// ALL 21 HARVEST MCP SERVER TOOLS

// RELATED SERVERS

// FAQ