# post_message

Post a message to a channel.

Agent View of the PolicyLayer registry record for `post_message`. HTML page: https://policylayer.com/tools/nitrostack/post-message

## Facts

- Tool: `post_message`
- Server: Nitrostack (`nitrocloudofficial/nitrostack`) — https://policylayer.com/tools/nitrostack.md
- Homepage: https://github.com/nitrocloudofficial/nitrostack
- Risk category: Write (Medium 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": "post_message",
    "arguments": {}
  }
}
```

## Why post_message is rated Medium

This tool creates new data (messages) in Slack channels, which is a Write operation. Severity is medium because while message posting is reversible and has no direct destructive impact, it could be misused to spam channels, impersonate users, or flood teams with unwanted notifications, causing operational disruption. The confidence is high given the explicit function name and clear description.

From the tool's own definition: "Tool name 'post_message' and description 'Post a message to a channel' indicate the tool creates new message content in Slack channels. This is a reversible write operation—messages can be edited or deleted after posting."

## Use case

AI agents use post_message to create or update resources in Nitrostack, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Nitrostack environment.

## Recommended policy (PolicyLayer)

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

```json
{
  "version": "1",
  "default": "deny",
  "tools": {
    "post_message": {
      "limits": [
        {
          "counter": "post_message_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}
```

## Other tools on Nitrostack (696)

- `cancel_appointment` — Destructive — https://policylayer.com/tools/nitrostack/cancel-appointment.md
- `cancel_followup` — Destructive — https://policylayer.com/tools/nitrostack/cancel-followup.md
- `cancel_order` — Destructive — https://policylayer.com/tools/nitrostack/cancel-order.md
- `clean_temp_files` — Destructive — https://policylayer.com/tools/nitrostack/clean-temp-files.md
- `clear_icon_cache` — Destructive — https://policylayer.com/tools/nitrostack/clear-icon-cache.md
- `commit_transaction` — Destructive — https://policylayer.com/tools/nitrostack/commit-transaction.md
- `delete_account` — Destructive — https://policylayer.com/tools/nitrostack/delete-account.md
- `delete_chat_session` — Destructive — https://policylayer.com/tools/nitrostack/delete-chat-session.md
- `delete_document` — Destructive — https://policylayer.com/tools/nitrostack/delete-document.md
- `delete_message` — Destructive — https://policylayer.com/tools/nitrostack/delete-message.md
- `delete_project` — Destructive — https://policylayer.com/tools/nitrostack/delete-project.md
- `empty_recycle_bin` — Destructive — https://policylayer.com/tools/nitrostack/empty-recycle-bin.md
- `obsidian-delete-note` — Destructive — https://policylayer.com/tools/nitrostack/obsidian-delete-note.md
- `release_environment` — Destructive — https://policylayer.com/tools/nitrostack/release-environment.md
- `remove_policy_rule` — Destructive — https://policylayer.com/tools/nitrostack/remove-policy-rule.md
- `reset_demo` — Destructive — https://policylayer.com/tools/nitrostack/reset-demo.md
- `reset_demo_data` — Destructive — https://policylayer.com/tools/nitrostack/reset-demo-data.md
- `revoke_api_key` — Destructive — https://policylayer.com/tools/nitrostack/revoke-api-key.md
- `revoke_invite` — Destructive — https://policylayer.com/tools/nitrostack/revoke-invite.md
- `rollback_transaction` — Destructive — https://policylayer.com/tools/nitrostack/rollback-transaction.md
- `screen_fraud` — Destructive — https://policylayer.com/tools/nitrostack/screen-fraud.md
- `send_email` — Destructive — https://policylayer.com/tools/nitrostack/send-email.md
- `accept_offer` — Execute — https://policylayer.com/tools/nitrostack/accept-offer.md
- `advance_application` — Execute — https://policylayer.com/tools/nitrostack/advance-application.md
- `analyze_material_health` — Execute — https://policylayer.com/tools/nitrostack/analyze-material-health.md
- `analyze_video` — Execute — https://policylayer.com/tools/nitrostack/analyze-video.md
- `approve_action` — Execute — https://policylayer.com/tools/nitrostack/approve-action.md
- `audit_pizza_shops` — Execute — https://policylayer.com/tools/nitrostack/audit-pizza-shops.md
- `call_tool` — Execute — https://policylayer.com/tools/nitrostack/call-tool.md
- `chat_architect` — Execute — https://policylayer.com/tools/nitrostack/chat-architect.md
- …and 666 more: https://policylayer.com/tools/nitrostack.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=nitrostack · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/nitrostack