# hash_file

A read tool on the Allcanuse MCP server.

Agent View of the PolicyLayer registry record for `hash_file`. HTML page: https://policylayer.com/tools/ra1nyxin-allcanuse-mcp/hash-file

## Facts

- Tool: `hash_file`
- Server: Allcanuse (`ra1nyxin/allcanuse-mcp`) — https://policylayer.com/tools/ra1nyxin-allcanuse-mcp.md
- Homepage: https://github.com/ra1nyxin/allcanuse-mcp
- Risk category: Read (Low risk)
- Registry record: grade F, identity unverified
- Server rate-limited: no
- Parameters: 0
- Recommended policy verdict: Allowed

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

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

## Why hash_file is rated Low

Hashing a file retrieves and processes its data to produce a digest, which is a read operation with no side effects, no code execution, and no data modification. Although the description is empty, the tool name is sufficiently clear. Confidence is slightly reduced due to lack of descriptive detail, but the semantic meaning of 'hash' is unambiguous in security contexts.

From the tool's own definition: "Tool name 'hash_file' indicates computation of a cryptographic hash of a file's contents. Hashing is a read-only operation that computes a fingerprint without modifying or executing anything."

## Use case

AI agents call hash_file to retrieve information from Allcanuse without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

## Recommended policy (PolicyLayer)

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

```json
{
  "version": "1",
  "default": "deny",
  "tools": {
    "hash_file": {}
  }
}
```

## Other tools on Allcanuse (129)

- `cancel_background_task` — Destructive — https://policylayer.com/tools/ra1nyxin-allcanuse-mcp/cancel-background-task.md
- `delete_path` — Destructive — https://policylayer.com/tools/ra1nyxin-allcanuse-mcp/delete-path.md
- `kill_process` — Destructive — https://policylayer.com/tools/ra1nyxin-allcanuse-mcp/kill-process.md
- `capture_camera_photo` — Execute — https://policylayer.com/tools/ra1nyxin-allcanuse-mcp/capture-camera-photo.md
- `capture_screenshot` — Execute — https://policylayer.com/tools/ra1nyxin-allcanuse-mcp/capture-screenshot.md
- `check_c_syntax` — Execute — https://policylayer.com/tools/ra1nyxin-allcanuse-mcp/check-c-syntax.md
- `compile_c_program` — Execute — https://policylayer.com/tools/ra1nyxin-allcanuse-mcp/compile-c-program.md
- `create_background_task` — Execute — https://policylayer.com/tools/ra1nyxin-allcanuse-mcp/create-background-task.md
- `deploy_and_update_service` — Execute — https://policylayer.com/tools/ra1nyxin-allcanuse-mcp/deploy-and-update-service.md
- `evaluate_c_math_expression` — Execute — https://policylayer.com/tools/ra1nyxin-allcanuse-mcp/evaluate-c-math-expression.md
- `extract_archive` — Execute — https://policylayer.com/tools/ra1nyxin-allcanuse-mcp/extract-archive.md
- `format_c_code` — Execute — https://policylayer.com/tools/ra1nyxin-allcanuse-mcp/format-c-code.md
- `generate_c_build_files` — Execute — https://policylayer.com/tools/ra1nyxin-allcanuse-mcp/generate-c-build-files.md
- `generate_c_numeric_test_harness` — Execute — https://policylayer.com/tools/ra1nyxin-allcanuse-mcp/generate-c-numeric-test-harness.md
- `http_request` — Execute — https://policylayer.com/tools/ra1nyxin-allcanuse-mcp/http-request.md
- `optimize_images_for_memory` — Execute — https://policylayer.com/tools/ra1nyxin-allcanuse-mcp/optimize-images-for-memory.md
- `pause_background_task` — Execute — https://policylayer.com/tools/ra1nyxin-allcanuse-mcp/pause-background-task.md
- `ping_host` — Execute — https://policylayer.com/tools/ra1nyxin-allcanuse-mcp/ping-host.md
- `preprocess_c_source` — Execute — https://policylayer.com/tools/ra1nyxin-allcanuse-mcp/preprocess-c-source.md
- `raw_tcp_exchange` — Execute — https://policylayer.com/tools/ra1nyxin-allcanuse-mcp/raw-tcp-exchange.md
- `resume_background_task` — Execute — https://policylayer.com/tools/ra1nyxin-allcanuse-mcp/resume-background-task.md
- `run_cmd` — Execute — https://policylayer.com/tools/ra1nyxin-allcanuse-mcp/run-cmd.md
- `run_powershell` — Execute — https://policylayer.com/tools/ra1nyxin-allcanuse-mcp/run-powershell.md
- `run_shell` — Execute — https://policylayer.com/tools/ra1nyxin-allcanuse-mcp/run-shell.md
- `scan_ports` — Execute — https://policylayer.com/tools/ra1nyxin-allcanuse-mcp/scan-ports.md
- `start_managed_process` — Execute — https://policylayer.com/tools/ra1nyxin-allcanuse-mcp/start-managed-process.md
- `start_process` — Execute — https://policylayer.com/tools/ra1nyxin-allcanuse-mcp/start-process.md
- `stop_managed_process` — Execute — https://policylayer.com/tools/ra1nyxin-allcanuse-mcp/stop-managed-process.md
- `tcp_connect` — Execute — https://policylayer.com/tools/ra1nyxin-allcanuse-mcp/tcp-connect.md
- `trace_route` — Execute — https://policylayer.com/tools/ra1nyxin-allcanuse-mcp/trace-route.md
- …and 99 more: https://policylayer.com/tools/ra1nyxin-allcanuse-mcp.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=ra1nyxin-allcanuse-mcp · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/ra1nyxin-allcanuse-mcp