# bash_execute

Execute a Bash command directly with output capture.

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

## Facts

- Tool: `bash_execute`
- 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_execute",
    "arguments": {}
  }
}
```

## Why bash_execute is rated High

This tool allows running arbitrary Bash commands, which can perform virtually any action depending on the arguments provided—from reading files to modifying system state, running external programs, or accessing network resources. The effects are determined entirely by what command is executed, making it an Execute category tool.

From the tool's own definition: "Tool description explicitly states 'Execute a Bash command directly with output capture.' The server description also mentions 'system command execution' as a core capability."

## Use case

AI agents invoke bash_execute 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_execute": {
      "limits": [
        {
          "counter": "bash_execute_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_pipe` — Execute — https://policylayer.com/tools/a-niranjan-mcp-filesystem/bash-pipe.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