# bash_pipe

Execute a sequence of Bash commands piped together.

Agent View of the PolicyLayer registry record for `bash_pipe`. HTML page: https://policylayer.com/tools/a-niranjan-mcp-filesystem/bash-pipe

## Facts

- Tool: `bash_pipe`
- Server: MCP Filesystem Server (`a-niranjan/mcp-filesystem`) — https://policylayer.com/tools/a-niranjan-mcp-filesystem.md
- Homepage: https://github.com/A-Niranjan/mcp-filesystem
- 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": "bash_pipe",
    "arguments": {}
  }
}
```

## Why bash_pipe is rated High

This tool executes shell commands with potential side effects determined by the piped command arguments. It is not a simple read operation (it executes, not queries), not primarily for data modification via standard CRUD (it runs arbitrary system commands), and not explicitly destructive unless the piped commands themselves perform destructive operations—making Execute the appropriate category.

From the tool's own definition: "Tool name 'bash_pipe' and description 'Execute a sequence of Bash commands piped together' explicitly indicates execution of arbitrary bash command sequences. The piping mechanism allows chaining commands with full shell capabilities."

## Use case

AI agents invoke bash_pipe to trigger actions in MCP Filesystem Server. 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 MCP Filesystem Server:

```json
{
  "version": "1",
  "default": "deny",
  "tools": {
    "bash_pipe": {
      "limits": [
        {
          "counter": "bash_pipe_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}
```

## Other tools on MCP Filesystem Server (16)

- `bash_command` — Execute — https://policylayer.com/tools/a-niranjan-mcp-filesystem/bash-command.md
- `bash_execute` — Execute — https://policylayer.com/tools/a-niranjan-mcp-filesystem/bash-execute.md
- `curl_request` — Execute — https://policylayer.com/tools/a-niranjan-mcp-filesystem/curl-request.md
- `execute_command` — Execute — https://policylayer.com/tools/a-niranjan-mcp-filesystem/execute-command.md
- `directory_tree` — Read — https://policylayer.com/tools/a-niranjan-mcp-filesystem/directory-tree.md
- `get_file_info` — Read — https://policylayer.com/tools/a-niranjan-mcp-filesystem/get-file-info.md
- `get_metrics` — Read — https://policylayer.com/tools/a-niranjan-mcp-filesystem/get-metrics.md
- `list_allowed_directories` — Read — https://policylayer.com/tools/a-niranjan-mcp-filesystem/list-allowed-directories.md
- `list_directory` — Read — https://policylayer.com/tools/a-niranjan-mcp-filesystem/list-directory.md
- `read_file` — Read — https://policylayer.com/tools/a-niranjan-mcp-filesystem/read-file.md
- `read_multiple_files` — Read — https://policylayer.com/tools/a-niranjan-mcp-filesystem/read-multiple-files.md
- `search_files` — Read — https://policylayer.com/tools/a-niranjan-mcp-filesystem/search-files.md
- `create_directory` — Write — https://policylayer.com/tools/a-niranjan-mcp-filesystem/create-directory.md
- `edit_file` — Write — https://policylayer.com/tools/a-niranjan-mcp-filesystem/edit-file.md
- `move_file` — Write — https://policylayer.com/tools/a-niranjan-mcp-filesystem/move-file.md
- `write_file` — Write — https://policylayer.com/tools/a-niranjan-mcp-filesystem/write-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`

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