# mcp_server_run_tool Invoke a tool on a downstream MCP server through the gateway. Risk 3. Agent View of the PolicyLayer registry record for `mcp_server_run_tool`. HTML page: https://policylayer.com/tools/yuga-hashimoto-localant/mcp-server-run-tool ## Facts - Tool: `mcp_server_run_tool` - Server: LocalAnt (`yuga-hashimoto/localant`) — https://policylayer.com/tools/yuga-hashimoto-localant.md - Homepage: https://github.com/yuga-hashimoto/localant - Risk category: Execute (High risk) - Registry record: grade F, identity unverified - Server rate-limited: no - Parameters: 0 - Recommended policy verdict: Rate-limited ## Example call (MCP tools/call, JSON-RPC 2.0) ```json { "jsonrpc": "2.0", "id": 1, "method": "tools/call", "params": { "name": "mcp_server_run_tool", "arguments": {} } } ``` ## Why mcp_server_run_tool is rated High This tool allows invoking any tool on downstream MCP servers, effectively bypassing the gateway's approval/permissioning model by delegating to unvetted downstream tools. An AI agent misusing this could trigger destructive, financial, or arbitrary code execution on connected systems. The critical severity reflects the gateway's loss of control over what actually executes on the target servers. From the tool's own definition: "Tool name 'mcp_server_run_tool' with description 'Invoke a tool on a downstream MCP server through the gateway' indicates execution of arbitrary tools on remote servers. The note 'Risk 3' (highest risk category) confirms this is a dangerous capability." ## Use case AI agents invoke mcp_server_run_tool to trigger actions in LocalAnt. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call: builds kicked off, notifications sent, workflows started. ## Recommended policy (PolicyLayer) Verdict: **Rate-limited**. Enforced by the PolicyLayer MCP gateway (https://policylayer.com/mcp-gateway) before a call reaches LocalAnt: ```json { "version": "1", "default": "deny", "tools": { "mcp_server_run_tool": { "limits": [ { "counter": "mcp_server_run_tool_rate", "window": "minute", "max": 10, "scope": "grant" } ] } } } ``` ## Other tools on LocalAnt (215) - `adb_clear_logcat` — Destructive — https://policylayer.com/tools/yuga-hashimoto-localant/adb-clear-logcat.md - `adb_uninstall` — Destructive — https://policylayer.com/tools/yuga-hashimoto-localant/adb-uninstall.md - `fs_delete_file_with_approval` — Destructive — https://policylayer.com/tools/yuga-hashimoto-localant/fs-delete-file-with-approval.md - `git_reset` — Destructive — https://policylayer.com/tools/yuga-hashimoto-localant/git-reset.md - `git_reset_hard` — Destructive — https://policylayer.com/tools/yuga-hashimoto-localant/git-reset-hard.md - `git_restore_file` — Destructive — https://policylayer.com/tools/yuga-hashimoto-localant/git-restore-file.md - `mcp_server_unregister` — Destructive — https://policylayer.com/tools/yuga-hashimoto-localant/mcp-server-unregister.md - `secret_remove` — Destructive — https://policylayer.com/tools/yuga-hashimoto-localant/secret-remove.md - `shell_remove_allowed_command` — Destructive — https://policylayer.com/tools/yuga-hashimoto-localant/shell-remove-allowed-command.md - `skill_uninstall` — Destructive — https://policylayer.com/tools/yuga-hashimoto-localant/skill-uninstall.md - `adb_input_text` — Execute — https://policylayer.com/tools/yuga-hashimoto-localant/adb-input-text.md - `adb_install_apk` — Execute — https://policylayer.com/tools/yuga-hashimoto-localant/adb-install-apk.md - `adb_keyevent` — Execute — https://policylayer.com/tools/yuga-hashimoto-localant/adb-keyevent.md - `adb_shell` — Execute — https://policylayer.com/tools/yuga-hashimoto-localant/adb-shell.md - `adb_start_app` — Execute — https://policylayer.com/tools/yuga-hashimoto-localant/adb-start-app.md - `adb_stop_app` — Execute — https://policylayer.com/tools/yuga-hashimoto-localant/adb-stop-app.md - `adb_swipe` — Execute — https://policylayer.com/tools/yuga-hashimoto-localant/adb-swipe.md - `adb_tap` — Execute — https://policylayer.com/tools/yuga-hashimoto-localant/adb-tap.md - `agent_run` — Execute — https://policylayer.com/tools/yuga-hashimoto-localant/agent-run.md - `approval_approve` — Execute — https://policylayer.com/tools/yuga-hashimoto-localant/approval-approve.md - `autopilot` — Execute — https://policylayer.com/tools/yuga-hashimoto-localant/autopilot.md - `bash` — Execute — https://policylayer.com/tools/yuga-hashimoto-localant/bash.md - `browser_click` — Execute — https://policylayer.com/tools/yuga-hashimoto-localant/browser-click.md - `browser_close` — Execute — https://policylayer.com/tools/yuga-hashimoto-localant/browser-close.md - `browser_evaluate` — Execute — https://policylayer.com/tools/yuga-hashimoto-localant/browser-evaluate.md - `browser_open` — Execute — https://policylayer.com/tools/yuga-hashimoto-localant/browser-open.md - `browser_press` — Execute — https://policylayer.com/tools/yuga-hashimoto-localant/browser-press.md - `browser_scroll` — Execute — https://policylayer.com/tools/yuga-hashimoto-localant/browser-scroll.md - `browser_select` — Execute — https://policylayer.com/tools/yuga-hashimoto-localant/browser-select.md - `browser_type` — Execute — https://policylayer.com/tools/yuga-hashimoto-localant/browser-type.md - …and 185 more: https://policylayer.com/tools/yuga-hashimoto-localant.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=yuga-hashimoto-localant · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/yuga-hashimoto-localant