# em_cancel_task

A destructive tool on the Execution Market MCP server.

Agent View of the PolicyLayer registry record for `em_cancel_task`. HTML page: https://policylayer.com/tools/market-execution-execution-market/em-cancel-task

## Facts

- Tool: `em_cancel_task`
- Server: Execution Market (`https://mcp.execution.market/mcp/`) — https://policylayer.com/tools/market-execution-execution-market.md
- Homepage: https://github.com/UltravioletaDAO/execution-market
- Risk category: Destructive (Critical risk)
- Registry record: grade F, identity unverified
- Server rate-limited: no
- Parameters: 0
- Recommended policy verdict: Hidden

## Example call (MCP tools/call, JSON-RPC 2.0)

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "em_cancel_task",
    "arguments": {}
  }
}
```

## Why em_cancel_task is rated Critical

Based on the name, this tool cancels a task, which is likely irreversible — cancelled tasks would release escrow, notify parties, and cannot be undone. Given the financial context (USDC payments, escrow), cancellation could also have financial implications.

From the tool's own definition: "Tool name: em_cancel_task; description is empty. Sibling tools suggest a task marketplace with USDC payments and escrow."

## Use case

AI agents call em_cancel_task to permanently remove resources in Execution Market, typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.

## Recommended policy (PolicyLayer)

Verdict: **Hidden**. Enforced by the PolicyLayer MCP gateway (https://policylayer.com/mcp-gateway) before a call reaches Execution Market:

```json
{
  "version": "1",
  "default": "deny",
  "hide": [
    "em_cancel_task"
  ]
}
```

## Other tools on Execution Market (80)

- `k1_emergency_stop` — Execute — https://policylayer.com/tools/market-execution-execution-market/k1-emergency-stop.md
- `k1_grip` — Execute — https://policylayer.com/tools/market-execution-execution-market/k1-grip.md
- `k1_pick` — Execute — https://policylayer.com/tools/market-execution-execution-market/k1-pick.md
- `k1_place` — Execute — https://policylayer.com/tools/market-execution-execution-market/k1-place.md
- `k1_sit` — Execute — https://policylayer.com/tools/market-execution-execution-market/k1-sit.md
- `k1_stand` — Execute — https://policylayer.com/tools/market-execution-execution-market/k1-stand.md
- `k1_walk_to` — Execute — https://policylayer.com/tools/market-execution-execution-market/k1-walk-to.md
- `ows_sign_eip191` — Execute — https://policylayer.com/tools/market-execution-execution-market/ows-sign-eip191.md
- `ows_sign_erc8128_request` — Execute — https://policylayer.com/tools/market-execution-execution-market/ows-sign-erc8128-request.md
- `ows_sign_message` — Execute — https://policylayer.com/tools/market-execution-execution-market/ows-sign-message.md
- `em_accept_agent_task` — Financial — https://policylayer.com/tools/market-execution-execution-market/em-accept-agent-task.md
- `em_approve_submission` — Financial — https://policylayer.com/tools/market-execution-execution-market/em-approve-submission.md
- `em_assign_task` — Financial — https://policylayer.com/tools/market-execution-execution-market/em-assign-task.md
- `em_claim_task` — Financial — https://policylayer.com/tools/market-execution-execution-market/em-claim-task.md
- `em_create_task` — Financial — https://policylayer.com/tools/market-execution-execution-market/em-create-task.md
- `em_escrow_authorize` — Financial — https://policylayer.com/tools/market-execution-execution-market/em-escrow-authorize.md
- `em_escrow_charge` — Financial — https://policylayer.com/tools/market-execution-execution-market/em-escrow-charge.md
- `em_escrow_dispute` — Financial — https://policylayer.com/tools/market-execution-execution-market/em-escrow-dispute.md
- `em_escrow_partial_release` — Financial — https://policylayer.com/tools/market-execution-execution-market/em-escrow-partial-release.md
- `em_escrow_refund` — Financial — https://policylayer.com/tools/market-execution-execution-market/em-escrow-refund.md
- `em_escrow_release` — Financial — https://policylayer.com/tools/market-execution-execution-market/em-escrow-release.md
- `em_get_payment_info` — Financial — https://policylayer.com/tools/market-execution-execution-market/em-get-payment-info.md
- `em_publish_task` — Financial — https://policylayer.com/tools/market-execution-execution-market/em-publish-task.md
- `em_resolve_dispute` — Financial — https://policylayer.com/tools/market-execution-execution-market/em-resolve-dispute.md
- `em_withdraw_earnings` — Financial — https://policylayer.com/tools/market-execution-execution-market/em-withdraw-earnings.md
- `moonpay_sign_onramp_url` — Financial — https://policylayer.com/tools/market-execution-execution-market/moonpay-sign-onramp-url.md
- `ows_sign_eip3009` — Financial — https://policylayer.com/tools/market-execution-execution-market/ows-sign-eip3009.md
- `robot_close_payshell_session` — Financial — https://policylayer.com/tools/market-execution-execution-market/robot-close-payshell-session.md
- `robot_open_payshell_session` — Financial — https://policylayer.com/tools/market-execution-execution-market/robot-open-payshell-session.md
- `robot_sign_voucher_tick` — Financial — https://policylayer.com/tools/market-execution-execution-market/robot-sign-voucher-tick.md
- …and 50 more: https://policylayer.com/tools/market-execution-execution-market.md

## For agents

This record is a snapshot. Live verdicts and the full registry:

- Check every server in your MCP config at once: `npx -y policylayer stack`
- Vet a server before you add it: install the mcp-precheck skill — `npx skills add https://policylayer.com` (skill text: https://policylayer.com/skill.md)
- Query the registry over MCP: endpoint `https://api.policylayer.com/mcp` — tools `check_mcp_server`, `check_mcp_stack`, `check_tool`, `search_registry`, `get_change_events`

---

Source: the PolicyLayer MCP registry — one continuously verified record per MCP server. Full record: https://policylayer.com/registry?q=market-execution-execution-market · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/market-execution-execution-market