# revoke_cert

Revoke an issued SSH certificate.

Agent View of the PolicyLayer registry record for `revoke_cert`. HTML page: https://policylayer.com/tools/bhayanak-ssh-mcp-server/revoke-cert

## Facts

- Tool: `revoke_cert`
- Server: SSH MCP Server (`bhayanak/ssh-mcp-server`) — https://policylayer.com/tools/bhayanak-ssh-mcp-server.md
- Homepage: https://github.com/bhayanak/ssh-mcp-server
- 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": "revoke_cert",
    "arguments": {}
  }
}
```

## Why revoke_cert is rated Critical

Revoking a certificate is an irreversible action that permanently invalidates an SSH certificate. Once revoked, the certificate cannot be un-revoked, potentially locking users or systems out of remote access. This constitutes a destructive, non-reversible operation with high blast radius if misused by an AI agent.

From the tool's own definition: "Revoke an issued SSH certificate"

## Use case

AI agents call revoke_cert to permanently remove resources in SSH MCP Server, 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 SSH MCP Server:

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

## Other tools on SSH MCP Server (22)

- `cancel_background_job` — Destructive — https://policylayer.com/tools/bhayanak-ssh-mcp-server/cancel-background-job.md
- `remove_ssh_key` — Destructive — https://policylayer.com/tools/bhayanak-ssh-mcp-server/remove-ssh-key.md
- `sftp_delete` — Destructive — https://policylayer.com/tools/bhayanak-ssh-mcp-server/sftp-delete.md
- `approve_request` — Execute — https://policylayer.com/tools/bhayanak-ssh-mcp-server/approve-request.md
- `request_approval` — Execute — https://policylayer.com/tools/bhayanak-ssh-mcp-server/request-approval.md
- `run_ssh_command` — Execute — https://policylayer.com/tools/bhayanak-ssh-mcp-server/run-ssh-command.md
- `run_ssh_command_background` — Execute — https://policylayer.com/tools/bhayanak-ssh-mcp-server/run-ssh-command-background.md
- `ssh_connect` — Execute — https://policylayer.com/tools/bhayanak-ssh-mcp-server/ssh-connect.md
- `get_audit_logs` — Read — https://policylayer.com/tools/bhayanak-ssh-mcp-server/get-audit-logs.md
- `get_host_facts` — Read — https://policylayer.com/tools/bhayanak-ssh-mcp-server/get-host-facts.md
- `list_background_jobs` — Read — https://policylayer.com/tools/bhayanak-ssh-mcp-server/list-background-jobs.md
- `list_hosts` — Read — https://policylayer.com/tools/bhayanak-ssh-mcp-server/list-hosts.md
- `list_pending_approvals` — Read — https://policylayer.com/tools/bhayanak-ssh-mcp-server/list-pending-approvals.md
- `list_templates` — Read — https://policylayer.com/tools/bhayanak-ssh-mcp-server/list-templates.md
- `poll_background_job` — Read — https://policylayer.com/tools/bhayanak-ssh-mcp-server/poll-background-job.md
- `sftp_list_directory` — Read — https://policylayer.com/tools/bhayanak-ssh-mcp-server/sftp-list-directory.md
- `ssh_list_sessions` — Read — https://policylayer.com/tools/bhayanak-ssh-mcp-server/ssh-list-sessions.md
- `ssh_session_ping` — Read — https://policylayer.com/tools/bhayanak-ssh-mcp-server/ssh-session-ping.md
- `add_ssh_key` — Write — https://policylayer.com/tools/bhayanak-ssh-mcp-server/add-ssh-key.md
- `issue_cert` — Write — https://policylayer.com/tools/bhayanak-ssh-mcp-server/issue-cert.md
- `ssh_disconnect` — Write — https://policylayer.com/tools/bhayanak-ssh-mcp-server/ssh-disconnect.md
- `transfer_file` — Write — https://policylayer.com/tools/bhayanak-ssh-mcp-server/transfer-file.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=bhayanak-ssh-mcp-server · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/bhayanak-ssh-mcp-server